diff --git a/src/main/github/auth-diagnose-routing.test.ts b/src/main/github/auth-diagnose-routing.test.ts
new file mode 100644
index 00000000000..dc1839a492e
--- /dev/null
+++ b/src/main/github/auth-diagnose-routing.test.ts
@@ -0,0 +1,44 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+
+const { ghExecFileAsyncMock, gitExecFileAsyncMock } = vi.hoisted(() => ({
+  ghExecFileAsyncMock: vi.fn(),
+  gitExecFileAsyncMock: vi.fn()
+}))
+
+vi.mock('../git/runner', () => ({
+  ghExecFileAsync: ghExecFileAsyncMock,
+  gitExecFileAsync: gitExecFileAsyncMock
+}))
+
+import { _resetOwnerRepoCache } from './gh-utils'
+import { diagnoseGhAuth } from './auth-diagnose'
+
+describe('diagnoseGhAuth routing', () => {
+  beforeEach(() => {
+    ghExecFileAsyncMock.mockReset()
+    gitExecFileAsyncMock.mockReset()
+    _resetOwnerRepoCache()
+  })
+
+  it('checks auth status for the repo GitHub Enterprise host', async () => {
+    gitExecFileAsyncMock
+      .mockRejectedValueOnce(new Error('upstream missing'))
+      .mockResolvedValueOnce({ stdout: 'https://ghe.acme.internal/acme/orca.git\n' })
+    ghExecFileAsyncMock.mockResolvedValueOnce({
+      stdout: '',
+      stderr: `ghe.acme.internal
+  ✓ Logged in to ghe.acme.internal account octocat (keyring)
+  - Active account: true
+  - Token scopes: 'project', 'read:org', 'repo'
+`
+    })
+
+    const result = await diagnoseGhAuth({ repoPath: '/repo' })
+
+    expect(result.activeAccount?.host).toBe('ghe.acme.internal')
+    expect(ghExecFileAsyncMock).toHaveBeenCalledWith(
+      ['auth', 'status', '--hostname', 'ghe.acme.internal'],
+      { cwd: '/repo' }
+    )
+  })
+})
diff --git a/src/main/github/auth-diagnose.ts b/src/main/github/auth-diagnose.ts
index aeaf4b9e284..b9635ba24a0 100644
--- a/src/main/github/auth-diagnose.ts
+++ b/src/main/github/auth-diagnose.ts
@@ -13,6 +13,8 @@
  */
 import { ghExecFileAsync } from '../git/runner'
 import type { GhAuthDiagnostic, GhAuthAccount } from '../../shared/github-auth-types'
+import type { GitHubRepoTarget } from '../../shared/github-project-types'
+import { getGitHubApiHostForRepo, ghRepoExecOptions, githubRepoContext } from './gh-utils'
 
 // Required scopes for ProjectV2 GraphQL access in Orca. `project` is the
 // scope that gates ProjectV2 reads/writes; the others are needed for the
@@ -90,13 +92,23 @@ export function parseAuthStatus(text: string): GhAuthAccount[] {
   return accounts
 }
 
-export async function diagnoseGhAuth(): Promise<GhAuthDiagnostic> {
+export async function diagnoseGhAuth(args: GitHubRepoTarget = {}): Promise<GhAuthDiagnostic> {
+  // Why (issue #1715): pass --hostname for the repo's git remote host when
+  // known so auth status reports scopes for the GHES/github.com account that
+  // will actually serve ProjectV2 calls.
+  const ghHost = args.repoPath
+    ? await getGitHubApiHostForRepo(args.repoPath, args.connectionId)
+    : null
+  const ghOptions = args.repoPath
+    ? ghRepoExecOptions(githubRepoContext(args.repoPath, args.connectionId))
+    : {}
+  const ghArgs = ['auth', 'status', ...(ghHost ? ['--hostname', ghHost] : [])]
   let raw = ''
   let ghAvailable = true
   try {
     // `gh auth status` exits non-zero when no host is logged in but still
     // prints the same diagnostic text we want, so capture both streams.
-    const { stdout, stderr } = await ghExecFileAsync(['auth', 'status'])
+    const { stdout, stderr } = await ghExecFileAsync(ghArgs, ghOptions)
     raw = `${stdout}\n${stderr}`
   } catch (err) {
     const stderr =
diff --git a/src/main/github/gh-utils.test.ts b/src/main/github/gh-utils.test.ts
index bc04b2bdc5c..ff633533f83 100644
--- a/src/main/github/gh-utils.test.ts
+++ b/src/main/github/gh-utils.test.ts
@@ -22,6 +22,7 @@ import {
   _resetOwnerRepoCache,
   classifyGhError,
   classifyListIssuesError,
+  getGitHubApiHostForRepo,
   getIssueOwnerRepo,
   getOwnerRepo,
   getOwnerRepoForRemote,
@@ -89,6 +90,28 @@ describe('github owner/repo resolution', () => {
     expect(parseGitHubOwnerRepo('https://ghe.acme.internal/acme/orca.git')).toBeNull()
   })
 
+  it('resolves a GitHub Enterprise host for gh api routing', async () => {
+    gitExecFileAsyncMock
+      .mockRejectedValueOnce(new Error('upstream missing'))
+      .mockResolvedValueOnce({ stdout: 'https://ghe.acme.internal/acme/orca.git\n' })
+
+    await expect(getGitHubApiHostForRepo('/repo')).resolves.toBe('ghe.acme.internal')
+    expect(gitExecFileAsyncMock).toHaveBeenNthCalledWith(1, ['remote', 'get-url', 'upstream'], {
+      cwd: '/repo'
+    })
+    expect(gitExecFileAsyncMock).toHaveBeenNthCalledWith(2, ['remote', 'get-url', 'origin'], {
+      cwd: '/repo'
+    })
+  })
+
+  it('does not route gh api to known non-GitHub hosts', async () => {
+    gitExecFileAsyncMock
+      .mockRejectedValueOnce(new Error('upstream missing'))
+      .mockResolvedValueOnce({ stdout: 'git@gitlab.com:acme/orca.git\n' })
+
+    await expect(getGitHubApiHostForRepo('/repo')).resolves.toBeNull()
+  })
+
   it('keeps getOwnerRepo origin-based', async () => {
     gitExecFileAsyncMock.mockResolvedValueOnce({
       stdout: 'git@github.com:fork/orca.git\n'
diff --git a/src/main/github/gh-utils.ts b/src/main/github/gh-utils.ts
index 44f25a0ed2c..c3187b0aa0c 100644
--- a/src/main/github/gh-utils.ts
+++ b/src/main/github/gh-utils.ts
@@ -7,6 +7,7 @@ import { gitExecFileAsync, ghExecFileAsync, extractExecError } from '../git/runn
 export const execFileAsync = promisify(execFile)
 export { ghExecFileAsync, gitExecFileAsync, extractExecError }
 export { classifyGhError, classifyListIssuesError } from './gh-error-classification'
+export { getGitHubApiHostForRepo } from './github-api-host-resolution'
 export {
   _getOwnerRepoCacheSize,
   _resetOwnerRepoCache,
diff --git a/src/main/github/github-api-host-resolution.ts b/src/main/github/github-api-host-resolution.ts
new file mode 100644
index 00000000000..2775b04b5ed
--- /dev/null
+++ b/src/main/github/github-api-host-resolution.ts
@@ -0,0 +1,63 @@
+import {
+  normalizeGitHubApiHost,
+  parseGitHubRemoteIdentity,
+  preferredGitHubApiHost
+} from './github-remote-identity-parsing'
+import { getRemoteUrlForRepo, githubRepoContext } from './github-repository-identity'
+
+// Why (issue #1715): mirror the owner/repo positive-cache window so a repo's
+// resolved gh API host and its owner/repo lookups expire on the same cadence.
+const REPO_HOST_CACHE_TTL_MS = 30_000
+
+const repoHostCache = new Map<string, { value: string | null; expiresAt: number }>()
+
+/** @internal - exposed for tests only */
+export function _resetRepoHostCache(): void {
+  repoHostCache.clear()
+}
+
+// Why (issue #1715): in multi-host setups gh must target the repo's own host.
+// Prefer the upstream remote's host, then origin's, so forks of a GHE repo
+// route to the enterprise host rather than the user's default github.com.
+export async function getGitHubApiHostForRepo(
+  repoPath: string,
+  connectionId?: string | null
+): Promise<string | null> {
+  const context = githubRepoContext(repoPath, connectionId)
+  const cacheKey = `${context.connectionId ?? 'local'}\0${context.repoPath}\0api-host`
+  const cached = repoHostCache.get(cacheKey)
+  if (cached && cached.expiresAt > Date.now()) {
+    return cached.value
+  }
+  if (cached) {
+    repoHostCache.delete(cacheKey)
+  }
+
+  let fallback: string | null = null
+  for (const remoteName of ['upstream', 'origin']) {
+    try {
+      const remoteUrl = await getRemoteUrlForRepo(context, remoteName)
+      const identity = remoteUrl ? parseGitHubRemoteIdentity(remoteUrl) : null
+      const host = identity ? normalizeGitHubApiHost(identity.host) : null
+      if (!host) {
+        continue
+      }
+      if (preferredGitHubApiHost(host)) {
+        repoHostCache.set(cacheKey, {
+          value: host,
+          expiresAt: Date.now() + REPO_HOST_CACHE_TTL_MS
+        })
+        return host
+      }
+      fallback ??= host
+    } catch {
+      // ignore missing remotes or non-git paths
+    }
+  }
+
+  repoHostCache.set(cacheKey, {
+    value: fallback,
+    expiresAt: Date.now() + REPO_HOST_CACHE_TTL_MS
+  })
+  return fallback
+}
diff --git a/src/main/github/github-remote-identity-parsing.ts b/src/main/github/github-remote-identity-parsing.ts
index e7bd21242f1..0fd1ba39656 100644
--- a/src/main/github/github-remote-identity-parsing.ts
+++ b/src/main/github/github-remote-identity-parsing.ts
@@ -47,3 +47,35 @@ export function parseGitHubOwnerRepo(remoteUrl: string): GitHubOwnerRepo | null
   }
   return { owner: identity.owner, repo: identity.repo }
 }
+
+// Why (issue #1715): validate and normalize a git remote host into a `gh api
+// --hostname` value. ProjectV2 is GitHub-only, so reject hosts that obviously
+// belong to other providers rather than mis-routing them to a GHES API.
+export function normalizeGitHubApiHost(host: string): string | null {
+  const normalized = host.trim().toLowerCase()
+  // Reject a leading dash so the host can never be mistaken for a gh CLI flag.
+  if (!/^[a-z0-9]([a-z0-9.-]*)?(?::[0-9]+)?$/.test(normalized)) {
+    return null
+  }
+  const hostname = normalized.split(':')[0]
+  if (
+    hostname === 'gitlab.com' ||
+    hostname.endsWith('.gitlab.com') ||
+    hostname === 'bitbucket.org' ||
+    hostname.endsWith('.bitbucket.org') ||
+    hostname === 'dev.azure.com' ||
+    hostname.endsWith('.visualstudio.com')
+  ) {
+    return null
+  }
+  return normalized
+}
+
+// Why (issue #1715): a heuristic for which remote host most likely hosts the
+// GitHub API. github.com is canonical; otherwise a host containing "github" or
+// "ghe" is almost certainly a GitHub Enterprise instance and is preferred over
+// an unrecognized host (which is only used as a fallback).
+export function preferredGitHubApiHost(host: string): boolean {
+  const hostname = host.split(':')[0]
+  return hostname === 'github.com' || hostname.includes('github') || hostname.includes('ghe')
+}
diff --git a/src/main/github/github-repository-identity.ts b/src/main/github/github-repository-identity.ts
index aa106972cdf..65f2e634251 100644
--- a/src/main/github/github-repository-identity.ts
+++ b/src/main/github/github-repository-identity.ts
@@ -8,6 +8,7 @@ import {
   type GitHubRemoteIdentity
 } from './github-remote-identity-parsing'
 import { isStableMissingGitRemoteError } from './stable-missing-git-remote-error'
+import { _resetRepoHostCache } from './github-api-host-resolution'
 
 export type OwnerRepo = GitHubOwnerRepo
 
@@ -66,6 +67,7 @@ const ownerRepoInFlight = new Map<string, Promise<OwnerRepo | null>>()
 export function _resetOwnerRepoCache(): void {
   ownerRepoCache.clear()
   ownerRepoInFlight.clear()
+  _resetRepoHostCache()
 }
 
 /** @internal - exposed for tests only */
diff --git a/src/main/github/project-view-routing.test.ts b/src/main/github/project-view-routing.test.ts
new file mode 100644
index 00000000000..8d18e259753
--- /dev/null
+++ b/src/main/github/project-view-routing.test.ts
@@ -0,0 +1,149 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+
+const { ghExecFileAsyncMock, gitExecFileAsyncMock, rateLimitGuardMock, noteRateLimitSpendMock } =
+  vi.hoisted(() => ({
+    ghExecFileAsyncMock: vi.fn(),
+    gitExecFileAsyncMock: vi.fn(),
+    rateLimitGuardMock: vi.fn(() => ({ blocked: false })),
+    noteRateLimitSpendMock: vi.fn()
+  }))
+
+vi.mock('../git/runner', () => ({
+  ghExecFileAsync: ghExecFileAsyncMock,
+  gitExecFileAsync: gitExecFileAsyncMock,
+  extractExecError: (err: unknown) => ({
+    stderr: err && typeof err === 'object' && 'stderr' in err ? String(err.stderr) : '',
+    stdout: err && typeof err === 'object' && 'stdout' in err ? String(err.stdout) : ''
+  })
+}))
+
+vi.mock('./rate-limit', () => ({
+  rateLimitGuard: rateLimitGuardMock,
+  noteRateLimitSpend: noteRateLimitSpendMock
+}))
+
+import { _resetOwnerRepoCache } from './gh-utils'
+import {
+  listAccessibleProjects,
+  updateIssueBySlug,
+  updateProjectItemFieldValue
+} from './project-view'
+
+function discoveryResponses(): { stdout: string; stderr: string }[] {
+  return [
+    {
+      stdout: JSON.stringify({
+        data: {
+          viewer: {
+            login: 'octocat',
+            projectsV2: { pageInfo: { hasNextPage: false }, nodes: [] }
+          }
+        }
+      }),
+      stderr: ''
+    },
+    {
+      stdout: JSON.stringify({
+        data: {
+          viewer: {
+            organizations: { pageInfo: { hasNextPage: false }, nodes: [] }
+          }
+        }
+      }),
+      stderr: ''
+    }
+  ]
+}
+
+describe('GitHub Project gh routing', () => {
+  beforeEach(() => {
+    ghExecFileAsyncMock.mockReset()
+    gitExecFileAsyncMock.mockReset()
+    rateLimitGuardMock.mockReset()
+    rateLimitGuardMock.mockReturnValue({ blocked: false })
+    noteRateLimitSpendMock.mockReset()
+    _resetOwnerRepoCache()
+  })
+
+  it('passes --hostname for GitHub Enterprise repo targets', async () => {
+    gitExecFileAsyncMock
+      .mockRejectedValueOnce(new Error('upstream missing'))
+      .mockResolvedValueOnce({ stdout: 'https://ghe.acme.internal/acme/orca.git\n' })
+    ghExecFileAsyncMock
+      .mockResolvedValueOnce(discoveryResponses()[0])
+      .mockResolvedValueOnce(discoveryResponses()[1])
+
+    await expect(listAccessibleProjects({ repoPath: '/repo' })).resolves.toMatchObject({
+      ok: true
+    })
+
+    expect(ghExecFileAsyncMock).toHaveBeenCalled()
+    for (const [argv, options] of ghExecFileAsyncMock.mock.calls) {
+      expect(argv).toEqual(expect.arrayContaining(['--hostname', 'ghe.acme.internal']))
+      expect(options).toMatchObject({ cwd: '/repo' })
+    }
+  })
+
+  it('does not pass known non-GitHub remote hosts as gh api hostnames', async () => {
+    gitExecFileAsyncMock
+      .mockRejectedValueOnce(new Error('upstream missing'))
+      .mockResolvedValueOnce({ stdout: 'git@gitlab.com:acme/orca.git\n' })
+    ghExecFileAsyncMock
+      .mockResolvedValueOnce(discoveryResponses()[0])
+      .mockResolvedValueOnce(discoveryResponses()[1])
+
+    await expect(listAccessibleProjects({ repoPath: '/repo' })).resolves.toMatchObject({
+      ok: true
+    })
+
+    const firstArgv = ghExecFileAsyncMock.mock.calls[0][0] as string[]
+    expect(firstArgv).not.toContain('--hostname')
+    expect(ghExecFileAsyncMock.mock.calls[0][1]).toMatchObject({ cwd: '/repo' })
+  })
+
+  it('passes --hostname for Project field and slug mutations', async () => {
+    gitExecFileAsyncMock
+      .mockRejectedValueOnce(new Error('upstream missing'))
+      .mockResolvedValueOnce({ stdout: 'https://ghe.acme.internal/acme/orca.git\n' })
+    ghExecFileAsyncMock.mockResolvedValueOnce({
+      stdout: JSON.stringify({ data: { updateProjectV2ItemFieldValue: {} } }),
+      stderr: ''
+    })
+
+    await expect(
+      updateProjectItemFieldValue({
+        repoPath: '/repo',
+        projectId: 'PVT_project',
+        itemId: 'PVTI_item',
+        fieldId: 'PVTF_field',
+        value: { kind: 'text', text: 'Ready' }
+      })
+    ).resolves.toEqual({ ok: true })
+
+    expect(ghExecFileAsyncMock.mock.calls[0][0]).toEqual(
+      expect.arrayContaining(['--hostname', 'ghe.acme.internal'])
+    )
+
+    ghExecFileAsyncMock.mockClear()
+    gitExecFileAsyncMock.mockClear()
+    _resetOwnerRepoCache()
+    gitExecFileAsyncMock
+      .mockRejectedValueOnce(new Error('upstream missing'))
+      .mockResolvedValueOnce({ stdout: 'https://ghe.acme.internal/acme/orca.git\n' })
+    ghExecFileAsyncMock.mockResolvedValueOnce({ stdout: '{}', stderr: '' })
+
+    await expect(
+      updateIssueBySlug({
+        repoPath: '/repo',
+        owner: 'acme',
+        repo: 'orca',
+        number: 12,
+        updates: { title: 'New title' }
+      })
+    ).resolves.toEqual({ ok: true })
+
+    expect(ghExecFileAsyncMock.mock.calls[0][0]).toEqual(
+      expect.arrayContaining(['--hostname', 'ghe.acme.internal'])
+    )
+  })
+})
diff --git a/src/main/github/project-view.test.ts b/src/main/github/project-view.test.ts
index 00a8844bb34..c0e27597548 100644
--- a/src/main/github/project-view.test.ts
+++ b/src/main/github/project-view.test.ts
@@ -136,7 +136,8 @@ describe('parseProjectPaste', () => {
       kind: 'org',
       owner: 'acme',
       number: 42,
-      viewNumber: 3
+      viewNumber: 3,
+      host: 'github.com'
     })
   })
 
@@ -144,7 +145,23 @@ describe('parseProjectPaste', () => {
     expect(parseProjectPaste('https://github.com/users/octocat/projects/1')).toEqual({
       kind: 'user',
       owner: 'octocat',
-      number: 1
+      number: 1,
+      host: 'github.com'
+    })
+  })
+
+  it('parses GitHub Enterprise project URL hosts', () => {
+    expect(parseProjectPaste('https://ghe/orgs/acme/projects/2')).toEqual({
+      kind: 'org',
+      owner: 'acme',
+      number: 2,
+      host: 'ghe'
+    })
+    expect(parseProjectPaste('https://ghe.acme.internal:8443/users/octocat/projects/3')).toEqual({
+      kind: 'user',
+      owner: 'octocat',
+      number: 3,
+      host: 'ghe.acme.internal:8443'
     })
   })
 
@@ -152,6 +169,10 @@ describe('parseProjectPaste', () => {
     expect(parseProjectPaste('https://github.com/orgs/co_op/projects/1')).toBeNull()
   })
 
+  it('rejects URLs whose host has invalid characters', () => {
+    expect(parseProjectPaste('https://github.com@evil.example/orgs/acme/projects/1')).toBeNull()
+  })
+
   it('returns null for empty input', () => {
     expect(parseProjectPaste('')).toBeNull()
     expect(parseProjectPaste('   ')).toBeNull()
diff --git a/src/main/github/project-view.ts b/src/main/github/project-view.ts
index 64835133d71..1e3037fea88 100644
--- a/src/main/github/project-view.ts
+++ b/src/main/github/project-view.ts
@@ -19,6 +19,8 @@ import {
   isValidOwnerSlug,
   assertSlug,
   assertPositiveInt,
+  targetToGhApiRoute,
+  type GhApiRoute,
   type GhGraphqlErrorShape,
   type GraphqlVars
 } from './project-view/internals'
@@ -41,6 +43,7 @@ import type {
   GitHubProjectViewError,
   GitHubProjectViewLayout,
   GitHubProjectViewSummary,
+  ListAccessibleProjectsArgs,
   ListAccessibleProjectsResult,
   ListProjectViewsArgs,
   ListProjectViewsResult,
@@ -638,12 +641,15 @@ function ownerQueryRoot(ownerType: GitHubProjectOwnerType): string {
   return ownerType === 'organization' ? 'organization' : 'user'
 }
 
-async function fetchProjectViewsPage(args: {
-  owner: string
-  ownerType: GitHubProjectOwnerType
-  projectNumber: number
-  after: string | null
-}): Promise<
+async function fetchProjectViewsPage(
+  args: {
+    owner: string
+    ownerType: GitHubProjectOwnerType
+    projectNumber: number
+    after: string | null
+  },
+  route: GhApiRoute
+): Promise<
   | {
       ok: true
       project: { id: string; title: string; url: string }
@@ -686,7 +692,8 @@ async function fetchProjectViewsPage(args: {
   }
   const res = await runGraphql<Record<string, { projectV2?: RawProjectConfig | null } | null>>(
     query,
-    vars
+    vars,
+    route
   )
   if (!res.ok) {
     return res
@@ -709,7 +716,8 @@ async function fetchProjectViewsPage(args: {
 
 async function fetchViewFieldsContinuation(
   viewId: string,
-  after: string
+  after: string,
+  route: GhApiRoute
 ): Promise<
   { ok: true; fields: RawProjectV2Field[] } | { ok: false; error: GitHubProjectViewError }
 > {
@@ -745,7 +753,7 @@ async function fetchViewFieldsContinuation(
           nodes?: (RawProjectV2Field | null)[]
         }
       } | null
-    }>(query, { viewId, after: cursor })
+    }>(query, { viewId, after: cursor }, route)
     if (!res.ok) {
       return res
     }
@@ -847,15 +855,18 @@ type RawItemsPage = {
 // Why: runGraphql returns the classified error but not the raw GraphQL
 // errors; for the parent-field retry decision we need those. This variant
 // returns the raw envelope so callers can re-inspect.
-async function fetchItemsPageWithRaw(args: {
-  owner: string
-  ownerType: GitHubProjectOwnerType
-  projectNumber: number
-  query: string
-  first: number
-  after: string | null
-  includeParent: boolean
-}): Promise<
+async function fetchItemsPageWithRaw(
+  args: {
+    owner: string
+    ownerType: GitHubProjectOwnerType
+    projectNumber: number
+    query: string
+    first: number
+    after: string | null
+    includeParent: boolean
+  },
+  route: GhApiRoute
+): Promise<
   | { ok: true; page: RawItemsPage }
   | {
       ok: false
@@ -887,7 +898,13 @@ async function fetchItemsPageWithRaw(args: {
     }
     ${FIELD_CONFIG_FRAGMENT}
   `
-  const argsArr: string[] = ['api', 'graphql', '-f', `query=${query}`]
+  const argsArr: string[] = [
+    'api',
+    ...(route.hostname ? ['--hostname', route.hostname] : []),
+    'graphql',
+    '-f',
+    `query=${query}`
+  ]
   argsArr.push('-f', `owner=${args.owner}`)
   argsArr.push('-F', `num=${args.projectNumber}`)
   argsArr.push('-f', `q=${args.query}`)
@@ -912,7 +929,10 @@ async function fetchItemsPageWithRaw(args: {
     let stderr = ''
     let execFailed = false
     try {
-      const r = await ghExecFileAsync(argsArr, { encoding: 'utf-8' })
+      const r = await ghExecFileAsync(argsArr, {
+        encoding: 'utf-8',
+        ...(route.cwd ? { cwd: route.cwd } : {})
+      })
       stdout = r.stdout
       stderr = r.stderr
     } catch (err) {
@@ -978,12 +998,15 @@ async function fetchItemsPageWithRaw(args: {
   }
 }
 
-async function fetchAllItems(args: {
-  owner: string
-  ownerType: GitHubProjectOwnerType
-  projectNumber: number
-  query: string
-}): Promise<
+async function fetchAllItems(
+  args: {
+    owner: string
+    ownerType: GitHubProjectOwnerType
+    projectNumber: number
+    query: string
+  },
+  route: GhApiRoute
+): Promise<
   | { ok: true; rows: GitHubProjectRow[]; totalCount: number; parentFieldDropped: boolean }
   | { ok: false; error: GitHubProjectViewError; totalCount?: number }
 > {
@@ -1017,15 +1040,18 @@ async function fetchAllItems(args: {
     parentFieldProbeInFlight.set(scopeKey, probe)
     probePromise = (async () => {
       try {
-        const result = await fetchItemsPageWithRaw({
-          owner: args.owner,
-          ownerType: args.ownerType,
-          projectNumber: args.projectNumber,
-          query: args.query,
-          first: ITEM_PAGE_SIZE,
-          after: null,
-          includeParent: true
-        })
+        const result = await fetchItemsPageWithRaw(
+          {
+            owner: args.owner,
+            ownerType: args.ownerType,
+            projectNumber: args.projectNumber,
+            query: args.query,
+            first: ITEM_PAGE_SIZE,
+            after: null,
+            includeParent: true
+          },
+          route
+        )
         // Why: flip parentFieldRetriedByOwner BEFORE resolveProbe()/clearing
         // parentFieldProbeInFlight so siblings that awoke on `inFlight.catch()`
         // observe the updated flag. Doing this in the outer block (after
@@ -1043,15 +1069,18 @@ async function fetchAllItems(args: {
     })()
     first = await probePromise
   } else {
-    first = await fetchItemsPageWithRaw({
-      owner: args.owner,
-      ownerType: args.ownerType,
-      projectNumber: args.projectNumber,
-      query: args.query,
-      first: ITEM_PAGE_SIZE,
-      after: null,
-      includeParent
-    })
+    first = await fetchItemsPageWithRaw(
+      {
+        owner: args.owner,
+        ownerType: args.ownerType,
+        projectNumber: args.projectNumber,
+        query: args.query,
+        first: ITEM_PAGE_SIZE,
+        after: null,
+        includeParent
+      },
+      route
+    )
   }
   if (!first.ok && includeParent && errorsIndicateParentField(first.rawErrors, first.stderr)) {
     // Retry the whole table without parent. Mark this owner as retried so
@@ -1066,15 +1095,18 @@ async function fetchAllItems(args: {
       )
       markParentFieldWarningLogged(scopeKey)
     }
-    first = await fetchItemsPageWithRaw({
-      owner: args.owner,
-      ownerType: args.ownerType,
-      projectNumber: args.projectNumber,
-      query: args.query,
-      first: ITEM_PAGE_SIZE,
-      after: null,
-      includeParent: false
-    })
+    first = await fetchItemsPageWithRaw(
+      {
+        owner: args.owner,
+        ownerType: args.ownerType,
+        projectNumber: args.projectNumber,
+        query: args.query,
+        first: ITEM_PAGE_SIZE,
+        after: null,
+        includeParent: false
+      },
+      route
+    )
   }
   if (!first.ok) {
     return { ok: false, error: first.error }
@@ -1133,15 +1165,18 @@ async function fetchAllItems(args: {
     }
   }
   while (hasNext) {
-    const next = await fetchItemsPageWithRaw({
-      owner: args.owner,
-      ownerType: args.ownerType,
-      projectNumber: args.projectNumber,
-      query: args.query,
-      first: ITEM_PAGE_SIZE,
-      after: cursor as string,
-      includeParent
-    })
+    const next = await fetchItemsPageWithRaw(
+      {
+        owner: args.owner,
+        ownerType: args.ownerType,
+        projectNumber: args.projectNumber,
+        query: args.query,
+        first: ITEM_PAGE_SIZE,
+        after: cursor as string,
+        includeParent
+      },
+      route
+    )
     if (!next.ok) {
       return { ok: false, error: next.error, totalCount }
     }
@@ -1174,12 +1209,15 @@ async function fetchAllItems(args: {
 
 // ─── Cheap count-only query (for unsupported_layout) ──────────────────
 
-async function fetchItemsCountOnly(args: {
-  owner: string
-  ownerType: GitHubProjectOwnerType
-  projectNumber: number
-  query: string
-}): Promise<number | null> {
+async function fetchItemsCountOnly(
+  args: {
+    owner: string
+    ownerType: GitHubProjectOwnerType
+    projectNumber: number
+    query: string
+  },
+  route: GhApiRoute
+): Promise<number | null> {
   const root = ownerQueryRoot(args.ownerType)
   const query = `
     query($owner:String!, $num:Int!, $q:String!) {
@@ -1192,7 +1230,7 @@ async function fetchItemsCountOnly(args: {
   `
   const res = await runGraphql<
     Record<string, { projectV2?: { items?: { totalCount?: number } | null } | null } | null>
-  >(query, { owner: args.owner, num: args.projectNumber, q: args.query })
+  >(query, { owner: args.owner, num: args.projectNumber, q: args.query }, route)
   if (!res.ok) {
     return null
   }
@@ -1219,6 +1257,7 @@ export async function getProjectViewTable(
       error: { type: 'validation_error', message: 'Invalid ownerType.' }
     }
   }
+  const ghRoute = await targetToGhApiRoute(args)
 
   // Paginate views until a match is found.
   let cursor: string | null = null
@@ -1227,12 +1266,15 @@ export async function getProjectViewTable(
   let matchStrength: 'id' | 'number' | 'name' | 'default' | null = null
   const viewsSeen: RawProjectView[] = []
   while (true) {
-    const page = await fetchProjectViewsPage({
-      owner: args.owner,
-      ownerType: args.ownerType,
-      projectNumber: args.projectNumber,
-      after: cursor
-    })
+    const page = await fetchProjectViewsPage(
+      {
+        owner: args.owner,
+        ownerType: args.ownerType,
+        projectNumber: args.projectNumber,
+        after: cursor
+      },
+      ghRoute
+    )
     if (!page.ok) {
       return { ok: false, error: page.error }
     }
@@ -1287,7 +1329,7 @@ export async function getProjectViewTable(
   let extraFields: RawProjectV2Field[] = []
   const fieldsPi = selectedRaw.fields?.pageInfo
   if (fieldsPi?.hasNextPage === true && typeof fieldsPi.endCursor === 'string' && selectedRaw.id) {
-    const cont = await fetchViewFieldsContinuation(selectedRaw.id, fieldsPi.endCursor)
+    const cont = await fetchViewFieldsContinuation(selectedRaw.id, fieldsPi.endCursor, ghRoute)
     if (!cont.ok) {
       return { ok: false, error: cont.error }
     }
@@ -1310,12 +1352,15 @@ export async function getProjectViewTable(
   // Unsupported layout: return without paginating items; attempt a cheap
   // count-only query best-effort.
   if (selectedView.layout !== 'TABLE_LAYOUT') {
-    const count = await fetchItemsCountOnly({
-      owner: args.owner,
-      ownerType: args.ownerType,
-      projectNumber: args.projectNumber,
-      query: effectiveQuery
-    })
+    const count = await fetchItemsCountOnly(
+      {
+        owner: args.owner,
+        ownerType: args.ownerType,
+        projectNumber: args.projectNumber,
+        query: effectiveQuery
+      },
+      ghRoute
+    )
     return {
       ok: false,
       error: {
@@ -1327,12 +1372,15 @@ export async function getProjectViewTable(
   }
 
   // Fetch items.
-  const items = await fetchAllItems({
-    owner: args.owner,
-    ownerType: args.ownerType,
-    projectNumber: args.projectNumber,
-    query: effectiveQuery
-  })
+  const items = await fetchAllItems(
+    {
+      owner: args.owner,
+      ownerType: args.ownerType,
+      projectNumber: args.projectNumber,
+      query: effectiveQuery
+    },
+    ghRoute
+  )
   if (!items.ok) {
     return {
       ok: false,
@@ -1386,7 +1434,10 @@ type RawViewerDiscovery = {
   }
 }
 
-export async function listAccessibleProjects(): Promise<ListAccessibleProjectsResult> {
+export async function listAccessibleProjects(
+  args: ListAccessibleProjectsArgs = {}
+): Promise<ListAccessibleProjectsResult> {
+  const ghRoute = await targetToGhApiRoute(args)
   const viewerProjects: GitHubProjectSummary[] = []
   const orgProjects: GitHubProjectSummary[] = []
   // Why: per-org failures are collected so the picker can render a "some orgs
@@ -1421,7 +1472,7 @@ export async function listAccessibleProjects(): Promise<ListAccessibleProjectsRe
     if (viewerCursor) {
       vars.after = viewerCursor
     }
-    const res = await runGraphql<RawViewerDiscovery>(query, vars)
+    const res = await runGraphql<RawViewerDiscovery>(query, vars, ghRoute)
     if (!res.ok) {
       // Why: a viewer-level failure is structural — if we can't list the
       // user's own projects, we have nothing to build on. Propagate as a
@@ -1496,7 +1547,7 @@ export async function listAccessibleProjects(): Promise<ListAccessibleProjectsRe
     if (orgCursor) {
       vars.orgAfter = orgCursor
     }
-    const res = await runGraphql<RawViewerDiscovery>(query, vars)
+    const res = await runGraphql<RawViewerDiscovery>(query, vars, ghRoute)
     if (!res.ok) {
       // Why: the org-listing query itself failed (not a nested projectsV2).
       // Record it as a partial failure against a synthetic `*` owner so the
@@ -1560,8 +1611,8 @@ export async function listAccessibleProjects(): Promise<ListAccessibleProjectsRe
 // ─── resolveProjectRef ─────────────────────────────────────────────────
 
 type ParsedPaste =
-  | { kind: 'org'; owner: string; number: number; viewNumber?: number }
-  | { kind: 'user'; owner: string; number: number; viewNumber?: number }
+  | { kind: 'org'; owner: string; number: number; viewNumber?: number; host: string }
+  | { kind: 'user'; owner: string; number: number; viewNumber?: number; host: string }
   | { kind: 'bare'; owner: string; number: number }
 
 export function parseProjectPaste(input: string): ParsedPaste | null {
@@ -1572,12 +1623,17 @@ export function parseProjectPaste(input: string): ParsedPaste | null {
   if (isGitHubProjectRefInputTooLarge(trimmed)) {
     return null
   }
-  // URL forms
-  const urlRe =
-    /^https?:\/\/github\.com\/(orgs|users)\/([^/]+)\/projects\/(\d+)(?:\/views\/(\d+))?/i
+  // URL forms — Why (issue #1715): accept any host so GHES project URLs (e.g.
+  // https://ghe.example.com/orgs/foo/projects/3) parse. The host is captured
+  // so callers can route gh against the right server with `gh api --hostname`.
+  const urlRe = /^https?:\/\/([^/\s]+)\/(orgs|users)\/([^/]+)\/projects\/(\d+)(?:\/views\/(\d+))?/i
   const m = trimmed.match(urlRe)
   if (m) {
-    const [, kindSeg, owner, nStr, vStr] = m
+    const [, rawHost, kindSeg, owner, nStr, vStr] = m
+    const host = normalizeProjectUrlHost(rawHost)
+    if (!host) {
+      return null
+    }
     const number = parseInt(nStr, 10)
     if (!Number.isInteger(number) || number < 1) {
       return null
@@ -1590,6 +1646,7 @@ export function parseProjectPaste(input: string): ParsedPaste | null {
       kind: kindSeg === 'orgs' ? 'org' : 'user',
       owner,
       number,
+      host,
       ...(viewNumber !== undefined && Number.isInteger(viewNumber) && viewNumber >= 1
         ? { viewNumber }
         : {})
@@ -1608,9 +1665,16 @@ export function parseProjectPaste(input: string): ParsedPaste | null {
   return null
 }
 
+function normalizeProjectUrlHost(host: string): string | null {
+  const normalized = host.trim().toLowerCase()
+  // Reject a leading dash so a pasted host can never be mistaken for a gh flag.
+  return /^[a-z0-9]([a-z0-9.-]*)?(?::[0-9]+)?$/.test(normalized) ? normalized : null
+}
+
 async function resolveOwnerType(
   owner: string,
-  preferred: GitHubProjectOwnerType | null
+  preferred: GitHubProjectOwnerType | null,
+  route: GhApiRoute
 ): Promise<
   | { ok: true; ownerType: GitHubProjectOwnerType; title: string }
   | { ok: false; error: GitHubProjectViewError }
@@ -1638,7 +1702,7 @@ async function resolveOwnerType(
     }
     const res = await runGraphql<
       Record<string, { projectV2?: { id?: string; title?: string } | null; login?: string } | null>
-    >(query, vars)
+    >(query, vars, route)
     if (!res.ok) {
       return { ok: false, error: res.error }
     }
@@ -1718,8 +1782,16 @@ export async function resolveProjectRef(
   }
   const preferred: GitHubProjectOwnerType | null =
     parsed.kind === 'org' ? 'organization' : parsed.kind === 'user' ? 'user' : null
+  const baseRoute = await targetToGhApiRoute(args)
+  // Why: pasted project URLs carry an explicit host. Prefer that over the
+  // active repo hint so users can paste a GHES URL even when the active repo
+  // context is absent or points at another GitHub host.
+  const ghRoute =
+    parsed.kind === 'bare'
+      ? baseRoute
+      : { ...baseRoute, hostname: parsed.host.trim().toLowerCase() }
   // Verify by fetching project title.
-  const ownerRes = await resolveOwnerType(parsed.owner, preferred)
+  const ownerRes = await resolveOwnerType(parsed.owner, preferred, ghRoute)
   if (!ownerRes.ok) {
     return { ok: false, error: ownerRes.error }
   }
@@ -1732,7 +1804,7 @@ export async function resolveProjectRef(
   `
   const res = await runGraphql<
     Record<string, { projectV2?: { id?: string; title?: string } | null } | null>
-  >(query, { owner: parsed.owner, num: parsed.number })
+  >(query, { owner: parsed.owner, num: parsed.number }, ghRoute)
   if (!res.ok) {
     return { ok: false, error: res.error }
   }
@@ -1771,15 +1843,19 @@ export async function listProjectViews(
   if (args.ownerType !== 'organization' && args.ownerType !== 'user') {
     return { ok: false, error: { type: 'validation_error', message: 'Invalid ownerType.' } }
   }
+  const ghRoute = await targetToGhApiRoute(args)
   const summaries: GitHubProjectViewSummary[] = []
   let cursor: string | null = null
   while (true) {
-    const page = await fetchProjectViewsPage({
-      owner: args.owner,
-      ownerType: args.ownerType,
-      projectNumber: args.projectNumber,
-      after: cursor
-    })
+    const page = await fetchProjectViewsPage(
+      {
+        owner: args.owner,
+        ownerType: args.ownerType,
+        projectNumber: args.projectNumber,
+        after: cursor
+      },
+      ghRoute
+    )
     if (!page.ok) {
       return { ok: false, error: page.error }
     }
diff --git a/src/main/github/project-view/internals.ts b/src/main/github/project-view/internals.ts
index 52509c30652..0ceebfc9eb8 100644
--- a/src/main/github/project-view/internals.ts
+++ b/src/main/github/project-view/internals.ts
@@ -6,14 +6,51 @@ classification semantics. */
 // for gh calls. The legacy plain `execFileAsync` is NOT used here — routing
 // every gh call through the runner gives us transient-5xx retry, WSL path
 // translation, and a single hook point for future quota tracking.
-import { acquire, release } from '../gh-utils'
+import {
+  acquire,
+  getGitHubApiHostForRepo,
+  ghRepoExecOptions,
+  githubRepoContext,
+  release
+} from '../gh-utils'
 import { extractExecError, ghExecFileAsync } from '../../git/runner'
 import { rateLimitGuard, noteRateLimitSpend, type RateLimitBucketKind } from '../rate-limit'
-import type { GitHubProjectViewError } from '../../../shared/github-project-types'
+import type { GitHubProjectViewError, GitHubRepoTarget } from '../../../shared/github-project-types'
 
 export { acquire, release, extractExecError, ghExecFileAsync, rateLimitGuard, noteRateLimitSpend }
 export type { RateLimitBucketKind }
 
+export type GhApiRoute = { cwd?: string; hostname?: string }
+
+// Why (issue #1715): `gh api graphql` does not reliably infer the API host
+// from cwd for hostless GraphQL calls, so resolve the repo's git remote host
+// and pass it as `gh api --hostname`. Keep cwd for placeholder expansion and
+// for commands that still consult local repo context.
+export async function targetToGhApiRoute(
+  target: GitHubRepoTarget | undefined
+): Promise<GhApiRoute> {
+  if (!target?.repoPath) {
+    return {}
+  }
+  const cwd = ghRepoExecOptions(githubRepoContext(target.repoPath, target.connectionId)).cwd
+  const hostname = await getGitHubApiHostForRepo(target.repoPath, target.connectionId)
+  return {
+    ...(cwd ? { cwd } : {}),
+    ...(hostname ? { hostname } : {})
+  }
+}
+
+function normalizeGhApiRoute(route?: GhApiRoute | string): GhApiRoute {
+  if (!route) {
+    return {}
+  }
+  return typeof route === 'string' ? { cwd: route } : route
+}
+
+function ghApiArgs(route: GhApiRoute, endpoint: string): string[] {
+  return ['api', ...(route.hostname ? ['--hostname', route.hostname] : []), endpoint]
+}
+
 // ─── Slug validation ──────────────────────────────────────────────────
 
 // Why: GitHub usernames/org logins disallow `_`, `.`, leading `-`. Repo names
@@ -269,7 +306,7 @@ export type GraphqlVars = Record<string, string | number | boolean>
 export async function runGraphql<T>(
   query: string,
   vars: GraphqlVars,
-  cwd?: string
+  route?: GhApiRoute | string
 ): Promise<
   | { ok: true; data: T }
   | { ok: false; error: GitHubProjectViewError; raw: { stderr: string; stdout: string } }
@@ -281,7 +318,8 @@ export async function runGraphql<T>(
   // Why: build argv as an array. `-f` for strings (including numbers passed
   // as strings), `-F` coerces to typed. We use `-f` uniformly and coerce in
   // the query via Int! casts, because `gh` can confuse empty strings.
-  const args: string[] = ['api', 'graphql', '-f', `query=${query}`]
+  const ghRoute = normalizeGhApiRoute(route)
+  const args: string[] = [...ghApiArgs(ghRoute, 'graphql'), '-f', `query=${query}`]
   for (const [k, v] of Object.entries(vars)) {
     if (typeof v === 'number' || typeof v === 'boolean') {
       args.push('-F', `${k}=${String(v)}`)
@@ -294,7 +332,7 @@ export async function runGraphql<T>(
   try {
     const { stdout, stderr } = await ghExecFileAsync(args, {
       encoding: 'utf-8',
-      ...(cwd ? { cwd } : {})
+      ...(ghRoute.cwd ? { cwd: ghRoute.cwd } : {})
     })
     try {
       const parsed = JSON.parse(stdout) as { data?: T; errors?: GhGraphqlErrorShape[] }
@@ -338,7 +376,7 @@ export async function runGraphql<T>(
 
 export async function runRest<T>(
   args: string[],
-  cwd?: string,
+  route?: GhApiRoute | string,
   bucket: RateLimitBucketKind = 'core',
   options?: { expectEmpty?: boolean }
 ): Promise<{ ok: true; data: T } | { ok: false; error: GitHubProjectViewError }> {
@@ -348,11 +386,15 @@ export async function runRest<T>(
   }
   await acquire()
   noteRateLimitSpend(bucket)
+  const ghRoute = normalizeGhApiRoute(route)
   try {
-    const { stdout, stderr } = await ghExecFileAsync(['api', ...args], {
-      encoding: 'utf-8',
-      ...(cwd ? { cwd } : {})
-    })
+    const { stdout, stderr } = await ghExecFileAsync(
+      [...ghApiArgs(ghRoute, args[0]), ...args.slice(1)],
+      {
+        encoding: 'utf-8',
+        ...(ghRoute.cwd ? { cwd: ghRoute.cwd } : {})
+      }
+    )
     // Why: 204/empty-body endpoints (DELETE label, DELETE comment) return no
     // body. Treat empty stdout as success rather than misclassifying the
     // unparseable response as 'unknown' — which the caller would otherwise
diff --git a/src/main/github/project-view/mutations.test.ts b/src/main/github/project-view/mutations.test.ts
index 9d8cabca7f8..683aaa3181b 100644
--- a/src/main/github/project-view/mutations.test.ts
+++ b/src/main/github/project-view/mutations.test.ts
@@ -21,6 +21,7 @@ vi.mock('./internals', () => ({
   rateLimitedError: () => ({ type: 'rate_limited', message: 'rate limited' }),
   runGraphql: vi.fn(),
   runRest: runRestMock,
+  targetToGhApiRoute: vi.fn(async () => ({})),
   validateSlugArgs: (owner: string, repo: string) =>
     owner && repo ? { ok: true } : { ok: false, error: { type: 'validation_error' } },
   assertPositiveInt: (value: number, name: string) =>
diff --git a/src/main/github/project-view/mutations.ts b/src/main/github/project-view/mutations.ts
index e2da3dae068..6a0e257f181 100644
--- a/src/main/github/project-view/mutations.ts
+++ b/src/main/github/project-view/mutations.ts
@@ -14,6 +14,7 @@ import {
   runRest,
   validateSlugArgs,
   assertPositiveInt,
+  targetToGhApiRoute,
   type GraphqlVars
 } from './internals'
 import type { GitHubAssignableUser, GitHubWorkItemDetails, PRComment } from '../../../shared/types'
@@ -122,7 +123,8 @@ export async function updateProjectItemFieldValue(
     fieldId: args.fieldId,
     value: valVar.val
   }
-  const res = await runGraphql<unknown>(query, vars)
+  const route = await targetToGhApiRoute(args)
+  const res = await runGraphql<unknown>(query, vars, route)
   if (!res.ok) {
     return { ok: false, error: res.error }
   }
@@ -144,11 +146,15 @@ export async function clearProjectItemFieldValue(
       }) { projectV2Item { id } }
     }
   `
-  const res = await runGraphql<unknown>(query, {
-    projectId: args.projectId,
-    itemId: args.itemId,
-    fieldId: args.fieldId
-  })
+  const res = await runGraphql<unknown>(
+    query,
+    {
+      projectId: args.projectId,
+      itemId: args.itemId,
+      fieldId: args.fieldId
+    },
+    await targetToGhApiRoute(args)
+  )
   if (!res.ok) {
     return { ok: false, error: res.error }
   }
@@ -182,6 +188,7 @@ export async function updateIssueBySlug(
     addAssignees,
     removeAssignees
   } = args.updates
+  const route = await targetToGhApiRoute(args)
 
   if (duplicateOf !== undefined && (state !== 'closed' || stateReason !== 'duplicate')) {
     return {
@@ -229,7 +236,12 @@ export async function updateIssueBySlug(
     }
     await acquire()
     try {
-      await ghExecFileAsync(stateArgs, { encoding: 'utf-8' })
+      // Why (issue #1715): `gh issue close/reopen` has no --hostname flag, so
+      // run it with the repo's cwd to let gh infer the GHES/github.com host.
+      await ghExecFileAsync(stateArgs, {
+        encoding: 'utf-8',
+        ...(route.cwd ? { cwd: route.cwd } : {})
+      })
     } catch (err) {
       const { stderr, stdout } = extractExecError(err)
       return { ok: false, error: classifyProjectError(stderr, stdout) }
@@ -247,7 +259,7 @@ export async function updateIssueBySlug(
     if (body !== undefined) {
       patchArgs.push('--raw-field', `body=${body}`)
     }
-    const r = await runRest<unknown>(patchArgs)
+    const r = await runRest<unknown>(patchArgs, route)
     if (!r.ok) {
       return { ok: false, error: r.error }
     }
@@ -263,7 +275,7 @@ export async function updateIssueBySlug(
   const addCount = addLabels?.length ?? 0
   if (removeCount > 1) {
     type RawLabelResp = { name?: string }[]
-    const fetched = await runRest<RawLabelResp>(['-X', 'GET', `${base}/labels`])
+    const fetched = await runRest<RawLabelResp>(['-X', 'GET', `${base}/labels`], route)
     if (!fetched.ok) {
       return { ok: false, error: fetched.error }
     }
@@ -281,7 +293,7 @@ export async function updateIssueBySlug(
       // body — GitHub does NOT interpret that as "clear labels". The
       // dedicated DELETE endpoint is the documented way to remove all
       // labels in a single call.
-      const r = await runRest<unknown>(['-X', 'DELETE', `${base}/labels`], undefined, 'core', {
+      const r = await runRest<unknown>(['-X', 'DELETE', `${base}/labels`], route, 'core', {
         expectEmpty: true
       })
       if (!r.ok && r.error.type !== 'not_found') {
@@ -292,7 +304,7 @@ export async function updateIssueBySlug(
       for (const name of currentNames) {
         putArgs.push('--raw-field', `labels[]=${name}`)
       }
-      const r = await runRest<unknown>(putArgs)
+      const r = await runRest<unknown>(putArgs, route)
       if (!r.ok) {
         return { ok: false, error: r.error }
       }
@@ -303,7 +315,7 @@ export async function updateIssueBySlug(
       for (const l of addLabels ?? []) {
         restArgs.push('--raw-field', `labels[]=${l}`)
       }
-      const r = await runRest<unknown>(restArgs)
+      const r = await runRest<unknown>(restArgs, route)
       if (!r.ok) {
         return { ok: false, error: r.error }
       }
@@ -311,7 +323,7 @@ export async function updateIssueBySlug(
     if (removeCount === 1) {
       const r = await runRest<unknown>(
         ['-X', 'DELETE', `${base}/labels/${encodeURIComponent(removeLabels![0])}`],
-        undefined,
+        route,
         'core',
         { expectEmpty: true }
       )
@@ -328,7 +340,7 @@ export async function updateIssueBySlug(
     for (const u of addAssignees) {
       restArgs.push('--raw-field', `assignees[]=${u}`)
     }
-    const r = await runRest<unknown>(restArgs)
+    const r = await runRest<unknown>(restArgs, route)
     if (!r.ok) {
       return { ok: false, error: r.error }
     }
@@ -338,7 +350,7 @@ export async function updateIssueBySlug(
     for (const u of removeAssignees) {
       restArgs.push('--raw-field', `assignees[]=${u}`)
     }
-    const r = await runRest<unknown>(restArgs)
+    const r = await runRest<unknown>(restArgs, route)
     if (!r.ok) {
       return { ok: false, error: r.error }
     }
@@ -384,7 +396,7 @@ export async function updatePullRequestBySlug(
     // No fields to update — nothing to do.
     return { ok: true }
   }
-  const r = await runRest<unknown>(patchArgs)
+  const r = await runRest<unknown>(patchArgs, await targetToGhApiRoute(args))
   if (!r.ok) {
     return { ok: false, error: r.error }
   }
@@ -425,13 +437,16 @@ export async function addIssueCommentBySlug(
   if (typeof args.body !== 'string' || !args.body.trim()) {
     return { ok: false, error: { type: 'validation_error', message: 'Comment body required.' } }
   }
-  const r = await runRest<RawIssueCommentResponse>([
-    '-X',
-    'POST',
-    `repos/${args.owner}/${args.repo}/issues/${args.number}/comments`,
-    '--raw-field',
-    `body=${args.body}`
-  ])
+  const r = await runRest<RawIssueCommentResponse>(
+    [
+      '-X',
+      'POST',
+      `repos/${args.owner}/${args.repo}/issues/${args.number}/comments`,
+      '--raw-field',
+      `body=${args.body}`
+    ],
+    await targetToGhApiRoute(args)
+  )
   if (!r.ok) {
     return { ok: false, error: r.error }
   }
@@ -452,13 +467,16 @@ export async function updateIssueCommentBySlug(
   if (typeof args.body !== 'string' || !args.body.trim()) {
     return { ok: false, error: { type: 'validation_error', message: 'Comment body required.' } }
   }
-  const r = await runRest<unknown>([
-    '-X',
-    'PATCH',
-    `repos/${args.owner}/${args.repo}/issues/comments/${args.commentId}`,
-    '--raw-field',
-    `body=${args.body}`
-  ])
+  const r = await runRest<unknown>(
+    [
+      '-X',
+      'PATCH',
+      `repos/${args.owner}/${args.repo}/issues/comments/${args.commentId}`,
+      '--raw-field',
+      `body=${args.body}`
+    ],
+    await targetToGhApiRoute(args)
+  )
   if (!r.ok) {
     return { ok: false, error: r.error }
   }
@@ -478,7 +496,7 @@ export async function deleteIssueCommentBySlug(
   }
   const r = await runRest<unknown>(
     ['-X', 'DELETE', `repos/${args.owner}/${args.repo}/issues/comments/${args.commentId}`],
-    undefined,
+    await targetToGhApiRoute(args),
     'core',
     { expectEmpty: true }
   )
@@ -501,14 +519,22 @@ export async function listLabelsBySlug(
   if (guard.blocked) {
     return { ok: false, error: rateLimitedError(guard) }
   }
+  const route = await targetToGhApiRoute(args)
   await acquire()
   // Why: `--paginate` may fan out to multiple pages; we can only reasonably
   // estimate a 1-call spend up front. The next probe will reconcile.
   noteRateLimitSpend('core')
   try {
     const { stdout } = await ghExecFileAsync(
-      ['api', '--paginate', `repos/${args.owner}/${args.repo}/labels`, '--jq', '.[].name'],
-      { encoding: 'utf-8' }
+      [
+        'api',
+        ...(route.hostname ? ['--hostname', route.hostname] : []),
+        '--paginate',
+        `repos/${args.owner}/${args.repo}/labels`,
+        '--jq',
+        '.[].name'
+      ],
+      { encoding: 'utf-8', ...(route.cwd ? { cwd: route.cwd } : {}) }
     )
     return {
       ok: true,
@@ -539,18 +565,20 @@ export async function listAssignableUsersBySlug(
   if (guard.blocked) {
     return { ok: false, error: rateLimitedError(guard) }
   }
+  const route = await targetToGhApiRoute(args)
   await acquire()
   noteRateLimitSpend('core')
   try {
     const { stdout } = await ghExecFileAsync(
       [
         'api',
+        ...(route.hostname ? ['--hostname', route.hostname] : []),
         '--paginate',
         `repos/${args.owner}/${args.repo}/assignees`,
         '--jq',
         '.[] | {login: .login, name: null, avatarUrl: .avatar_url}'
       ],
-      { encoding: 'utf-8' }
+      { encoding: 'utf-8', ...(route.cwd ? { cwd: route.cwd } : {}) }
     )
     for (const line of stdout
       .trim()
@@ -614,7 +642,7 @@ export async function listIssueTypesBySlug(
         } | null)[]
       } | null
     } | null
-  }>(query, { owner: args.owner, repo: args.repo })
+  }>(query, { owner: args.owner, repo: args.repo }, await targetToGhApiRoute(args))
   if (!res.ok) {
     // Why: repos without issue types respond with a GraphQL error claiming the
     // `issueTypes` field is unknown. Map that to an empty list so the UI shows
@@ -659,7 +687,8 @@ export async function updateIssueTypeBySlug(
     `query($owner:String!, $repo:String!, $num:Int!) {
        repository(owner:$owner, name:$repo) { issue(number:$num) { id } }
      }`,
-    { owner: args.owner, repo: args.repo, num: args.number }
+    { owner: args.owner, repo: args.repo, num: args.number },
+    await targetToGhApiRoute(args)
   )
   if (!lookup.ok) {
     return { ok: false, error: lookup.error }
@@ -689,7 +718,7 @@ export async function updateIssueTypeBySlug(
   const vars: GraphqlVars = args.issueTypeId
     ? { issueId, issueTypeId: args.issueTypeId }
     : { issueId }
-  const res = await runGraphql<unknown>(query, vars)
+  const res = await runGraphql<unknown>(query, vars, await targetToGhApiRoute(args))
   if (!res.ok) {
     return { ok: false, error: res.error }
   }
@@ -810,7 +839,11 @@ export async function getWorkItemDetailsBySlug(
           })
         | null
     } | null
-  }>(query, { owner: args.owner, repo: args.repo, num: args.number })
+  }>(
+    query,
+    { owner: args.owner, repo: args.repo, num: args.number },
+    await targetToGhApiRoute(args)
+  )
   if (!res.ok) {
     return { ok: false, error: res.error }
   }
diff --git a/src/main/ipc/github.ts b/src/main/ipc/github.ts
index 2a808f60325..9830fee3b29 100644
--- a/src/main/ipc/github.ts
+++ b/src/main/ipc/github.ts
@@ -93,6 +93,8 @@ import type {
   ClearProjectItemFieldArgs,
   DeleteIssueCommentBySlugArgs,
   GetProjectViewTableArgs,
+  GitHubRepoTarget,
+  ListAccessibleProjectsArgs,
   ListAssignableUsersBySlugArgs,
   ListIssueTypesBySlugArgs,
   ListLabelsBySlugArgs,
@@ -1122,7 +1124,7 @@ export function registerGitHubHandlers(store: Store, stats: StatsCollector): voi
     getRateLimit(args?.force ? { force: true } : undefined)
   )
 
-  ipcMain.handle('gh:diagnoseAuth', () => diagnoseGhAuth())
+  ipcMain.handle('gh:diagnoseAuth', (_event, args?: GitHubRepoTarget) => diagnoseGhAuth(args))
 
   // ── GitHub ProjectV2 view handlers ─────────────────────────────────
   // Why: registered unconditionally so enabling the experimental flag at
@@ -1130,7 +1132,9 @@ export function registerGitHubHandlers(store: Store, stats: StatsCollector): voi
   // Handlers never throw across IPC — every failure mode resolves through the
   // GitHubProjectViewError envelope.
 
-  ipcMain.handle('gh:listAccessibleProjects', () => listAccessibleProjects())
+  ipcMain.handle('gh:listAccessibleProjects', (_event, args?: ListAccessibleProjectsArgs) =>
+    listAccessibleProjects(args)
+  )
 
   ipcMain.handle('gh:resolveProjectRef', (_event, args: ResolveProjectRefArgs) =>
     resolveProjectRef(args)
diff --git a/src/main/runtime/orca-runtime.ts b/src/main/runtime/orca-runtime.ts
index 4c421345834..dc83b4ff472 100644
--- a/src/main/runtime/orca-runtime.ts
+++ b/src/main/runtime/orca-runtime.ts
@@ -525,6 +525,7 @@ import {
 import type {
   ClearProjectItemFieldArgs,
   GetProjectViewTableArgs,
+  ListAccessibleProjectsArgs,
   ListAssignableUsersBySlugArgs,
   ListIssueTypesBySlugArgs,
   ListLabelsBySlugArgs,
@@ -11073,8 +11074,10 @@ export class OrcaRuntimeService {
     )
   }
 
-  async listGitHubProjects(): Promise<Awaited<ReturnType<typeof listAccessibleProjects>>> {
-    return listAccessibleProjects()
+  async listGitHubProjects(
+    args?: ListAccessibleProjectsArgs
+  ): Promise<Awaited<ReturnType<typeof listAccessibleProjects>>> {
+    return listAccessibleProjects(args)
   }
 
   async listGitHubLabelsBySlug(
diff --git a/src/main/runtime/rpc/methods/github.ts b/src/main/runtime/rpc/methods/github.ts
index 6c8b8bd9995..59ef765f53d 100644
--- a/src/main/runtime/rpc/methods/github.ts
+++ b/src/main/runtime/rpc/methods/github.ts
@@ -45,10 +45,6 @@ const SlugRepo = z.object({
   repo: requiredString('Missing repo')
 })
 
-const SlugAssignableUsers = SlugRepo.extend({
-  seedLogins: z.array(z.string()).optional()
-})
-
 const PrForBranch = RepoSelector.extend({
   branch: requiredString('Missing branch'),
   linkedPRNumber: z.number().int().positive().nullable().optional(),
@@ -198,7 +194,22 @@ const PRReviewCommentReply = RepoSelector.extend({
 
 const ProjectOwnerType = z.enum(['organization', 'user'])
 
-const ProjectViewTable = z.object({
+// Why (issue #1715): repo target lets the renderer hint which gh host to
+// route to in multi-host setups. Both fields optional — callers without a
+// repo context (e.g. paste-to-add from a foreign host) accept gh's globally
+// active host. `repoPath` lets main resolve the git remote host for
+// `gh api --hostname`; local repos also use it as cwd for repo placeholders.
+const RepoTarget = z.object({
+  repoPath: OptionalString,
+  connectionId: OptionalString.nullable().optional()
+})
+
+const RoutedSlugRepo = RepoTarget.merge(SlugRepo)
+const RoutedSlugAssignableUsers = RoutedSlugRepo.extend({
+  seedLogins: z.array(z.string()).optional()
+})
+
+const ProjectViewTable = RepoTarget.extend({
   owner: requiredString('Missing owner'),
   ownerType: ProjectOwnerType,
   projectNumber: z.number().int().positive(),
@@ -208,44 +219,40 @@ const ProjectViewTable = z.object({
   queryOverride: OptionalString
 })
 
-const ProjectWorkItemDetailsBySlug = SlugRepo.extend({
+const ProjectWorkItemDetailsBySlug = RoutedSlugRepo.extend({
   number: z.number().int().positive(),
   type: z.enum(['issue', 'pr'])
 })
 
-const ProjectRef = z.object({
+const ProjectRef = RepoTarget.extend({
   input: requiredString('Missing project reference')
 })
 
-const ProjectViews = z.object({
+const ProjectViews = RepoTarget.extend({
   owner: requiredString('Missing owner'),
   ownerType: ProjectOwnerType,
   projectNumber: z.number().int().positive()
 })
 
-const ProjectItemField = z.object({
+const ProjectItemField = RepoTarget.extend({
   projectId: requiredString('Missing project ID'),
   itemId: requiredString('Missing item ID'),
   fieldId: requiredString('Missing field ID'),
   value: z.any()
 })
 
-const ClearProjectItemField = z.object({
+const ClearProjectItemField = RepoTarget.extend({
   projectId: requiredString('Missing project ID'),
   itemId: requiredString('Missing item ID'),
   fieldId: requiredString('Missing field ID')
 })
 
-const SlugIssueUpdate = z.object({
-  owner: requiredString('Missing owner'),
-  repo: requiredString('Missing repo'),
+const SlugIssueUpdate = RoutedSlugRepo.extend({
   number: z.number().int().positive(),
   updates: IssueUpdate
 })
 
-const SlugPullRequestUpdate = z.object({
-  owner: requiredString('Missing owner'),
-  repo: requiredString('Missing repo'),
+const SlugPullRequestUpdate = RoutedSlugRepo.extend({
   number: z.number().int().positive(),
   updates: z.object({
     state: z.enum(['open', 'closed']).optional(),
@@ -254,30 +261,22 @@ const SlugPullRequestUpdate = z.object({
   })
 })
 
-const SlugIssueTypeUpdate = z.object({
-  owner: requiredString('Missing owner'),
-  repo: requiredString('Missing repo'),
+const SlugIssueTypeUpdate = RoutedSlugRepo.extend({
   number: z.number().int().positive(),
   issueTypeId: z.string().nullable()
 })
 
-const SlugIssueComment = z.object({
-  owner: requiredString('Missing owner'),
-  repo: requiredString('Missing repo'),
+const SlugIssueComment = RoutedSlugRepo.extend({
   number: z.number().int().positive(),
   body: requiredString('Comment body required')
 })
 
-const SlugIssueCommentEdit = z.object({
-  owner: requiredString('Missing owner'),
-  repo: requiredString('Missing repo'),
+const SlugIssueCommentEdit = RoutedSlugRepo.extend({
   commentId: z.number().int().positive(),
   body: requiredString('Comment body required')
 })
 
-const SlugIssueCommentDelete = z.object({
-  owner: requiredString('Missing owner'),
-  repo: requiredString('Missing repo'),
+const SlugIssueCommentDelete = RoutedSlugRepo.extend({
   commentId: z.number().int().positive()
 })
 
@@ -542,22 +541,22 @@ export const GITHUB_METHODS: RpcMethod[] = [
   }),
   defineMethod({
     name: 'github.project.listAccessible',
-    params: z.object({}),
-    handler: async (_params, { runtime }) => runtime.listGitHubProjects()
+    params: RepoTarget,
+    handler: async (params, { runtime }) => runtime.listGitHubProjects(params)
   }),
   defineMethod({
     name: 'github.project.listLabelsBySlug',
-    params: SlugRepo,
+    params: RoutedSlugRepo,
     handler: async (params, { runtime }) => runtime.listGitHubLabelsBySlug(params)
   }),
   defineMethod({
     name: 'github.project.listAssignableUsersBySlug',
-    params: SlugAssignableUsers,
+    params: RoutedSlugAssignableUsers,
     handler: async (params, { runtime }) => runtime.listGitHubAssignableUsersBySlug(params)
   }),
   defineMethod({
     name: 'github.project.listIssueTypesBySlug',
-    params: SlugRepo,
+    params: RoutedSlugRepo,
     handler: async (params, { runtime }) => runtime.listGitHubIssueTypesBySlug(params)
   }),
   defineMethod({
diff --git a/src/preload/api-types.ts b/src/preload/api-types.ts
index 7ae75a59aa3..71867482831 100644
--- a/src/preload/api-types.ts
+++ b/src/preload/api-types.ts
@@ -202,6 +202,8 @@ import type {
   GetProjectViewTableResult,
   GitHubProjectCommentMutationResult,
   GitHubProjectMutationResult,
+  GitHubRepoTarget,
+  ListAccessibleProjectsArgs,
   ListAccessibleProjectsResult,
   ListAssignableUsersBySlugArgs,
   ListAssignableUsersBySlugResult,
@@ -1385,9 +1387,11 @@ export type PreloadApi = {
      * shell and silently shadows the keyring credential — in that case
      * `gh auth refresh` is a no-op and the UI must say so.
      */
-    diagnoseAuth: () => Promise<GhAuthDiagnostic>
+    diagnoseAuth: (args?: GitHubRepoTarget) => Promise<GhAuthDiagnostic>
     // ── ProjectV2 (GitHub Projects) ─────────────────────────────────
-    listAccessibleProjects: () => Promise<ListAccessibleProjectsResult>
+    listAccessibleProjects: (
+      args?: ListAccessibleProjectsArgs
+    ) => Promise<ListAccessibleProjectsResult>
     resolveProjectRef: (args: ResolveProjectRefArgs) => Promise<ResolveProjectRefResult>
     listProjectViews: (args: ListProjectViewsArgs) => Promise<ListProjectViewsResult>
     getProjectViewTable: (args: GetProjectViewTableArgs) => Promise<GetProjectViewTableResult>
diff --git a/src/preload/index.ts b/src/preload/index.ts
index a3adca161ba..a795be0cca6 100644
--- a/src/preload/index.ts
+++ b/src/preload/index.ts
@@ -90,6 +90,8 @@ import type {
   GetProjectViewTableResult,
   GitHubProjectCommentMutationResult,
   GitHubProjectMutationResult,
+  GitHubRepoTarget,
+  ListAccessibleProjectsArgs,
   ListAccessibleProjectsResult,
   ListAssignableUsersBySlugArgs,
   ListAssignableUsersBySlugResult,
@@ -1247,11 +1249,14 @@ const api = {
     rateLimit: (args?: { force?: boolean }): Promise<GetRateLimitResult> =>
       ipcRenderer.invoke('gh:rateLimit', args),
 
-    diagnoseAuth: (): Promise<GhAuthDiagnostic> => ipcRenderer.invoke('gh:diagnoseAuth'),
+    diagnoseAuth: (args?: GitHubRepoTarget): Promise<GhAuthDiagnostic> =>
+      ipcRenderer.invoke('gh:diagnoseAuth', args),
 
     // ── ProjectV2 (GitHub Projects) ───────────────────────────────────
-    listAccessibleProjects: (): Promise<ListAccessibleProjectsResult> =>
-      ipcRenderer.invoke('gh:listAccessibleProjects'),
+    listAccessibleProjects: (
+      args?: ListAccessibleProjectsArgs
+    ): Promise<ListAccessibleProjectsResult> =>
+      ipcRenderer.invoke('gh:listAccessibleProjects', args),
     resolveProjectRef: (args: ResolveProjectRefArgs): Promise<ResolveProjectRefResult> =>
       ipcRenderer.invoke('gh:resolveProjectRef', args),
     listProjectViews: (args: ListProjectViewsArgs): Promise<ListProjectViewsResult> =>
diff --git a/src/renderer/src/components/GitHubItemDialog.tsx b/src/renderer/src/components/GitHubItemDialog.tsx
index 1ff788a6c95..cce115f9642 100644
--- a/src/renderer/src/components/GitHubItemDialog.tsx
+++ b/src/renderer/src/components/GitHubItemDialog.tsx
@@ -180,6 +180,7 @@ import {
   getGithubWorkItemWorkspaceAttachmentLabel
 } from '@/lib/github-work-item-workspace-attachment'
 import { startFixChecksAgent } from '@/lib/fix-checks-agent-launch'
+import { activeGitHubRepoTargetFromState } from '@/lib/github-active-repo-target'
 import { activateAndRevealWorktree } from '@/lib/worktree-activation'
 import { buildFixBrokenChecksPrompt, getBrokenChecks } from '@/components/pr-checks-fix-prompt'
 import type {
@@ -734,6 +735,25 @@ function PRReviewersPanel({
         : repoOwnerSettings,
     [repoOwnerSettings, sourceContext]
   )
+  // Why (issue #1715): the slug-addressed reviewer/label/assignee lookups need
+  // the repo-host routing hint so they resolve against the host that owns the
+  // dialog's repo (github.com vs GHES).
+  const repoForTarget = useAppStore((s) =>
+    repoPath
+      ? (s.repos.find((repo) => repo.path === repoPath) ?? null)
+      : s.activeRepoId
+        ? (s.repos.find((repo) => repo.id === s.activeRepoId) ?? null)
+        : null
+  )
+  const repoTarget = useMemo(
+    () =>
+      repoForTarget
+        ? { repoPath: repoForTarget.path, connectionId: repoForTarget.connectionId ?? null }
+        : repoPath
+          ? { repoPath }
+          : {},
+    [repoForTarget, repoPath]
+  )
   const reviewerInputRef = useRef<HTMLInputElement | null>(null)
   const reviewerInputFocusFrameRef = useRef<number | null>(null)
   const reviewerPanelMountedRef = useRef(true)
@@ -808,7 +828,8 @@ function PRReviewersPanel({
     open && reviewSlug ? reviewSlug.owner : null,
     open && reviewSlug ? reviewSlug.repo : null,
     reviewerSeedUsers.map((user) => user.login),
-    sourceSettings
+    sourceSettings,
+    repoTarget
   )
   const reviewerMetadataByPath = useRepoAssignees(
     open && !reviewSlug ? repoPath : null,
@@ -4891,8 +4912,10 @@ async function runIssueUpdate(args: {
   updates: Parameters<typeof window.api.gh.updateIssue>[0]['updates']
 }): Promise<void> {
   if (args.projectOrigin) {
+    const state = useAppStore.getState()
     const target = getActiveRuntimeTarget(getGitHubMutationSettings(args.repoId))
     const updateArgs = {
+      ...activeGitHubRepoTargetFromState(state),
       owner: args.projectOrigin.owner,
       repo: args.projectOrigin.repo,
       number: args.number,
@@ -4944,8 +4967,10 @@ async function runWorkItemBodyUpdate(args: {
     if (!targetSlug) {
       throw new Error('No GitHub repository context available for this pull request.')
     }
+    const state = useAppStore.getState()
     const target = getActiveRuntimeTarget(getGitHubMutationSettings(args.item.repoId))
     const updateArgs = {
+      ...activeGitHubRepoTargetFromState(state),
       owner: targetSlug.owner,
       repo: targetSlug.repo,
       number: args.item.number,
@@ -4987,8 +5012,10 @@ async function runPullRequestStateUpdate(args: {
   updates: { state: 'open' | 'closed' }
 }): Promise<void> {
   if (args.projectOrigin) {
+    const state = useAppStore.getState()
     const target = getActiveRuntimeTarget(getGitHubMutationSettings(args.repoId))
     const updateArgs = {
+      ...activeGitHubRepoTargetFromState(state),
       owner: args.projectOrigin.owner,
       repo: args.projectOrigin.repo,
       number: args.number,
@@ -5142,6 +5169,27 @@ function GHEditSection({
         : repoOwnerSettings,
     [repoOwnerSettings, sourceContext]
   )
+  // Why (issue #1715): the slug-addressed label/assignee lookups need the
+  // repo-host routing hint so they resolve against the host that owns the
+  // dialog's repo (github.com vs GHES).
+  const repoForTarget = useAppStore((s) =>
+    repoId
+      ? (s.repos.find((repo) => repo.id === repoId) ?? null)
+      : repoPath
+        ? (s.repos.find((repo) => repo.path === repoPath) ?? null)
+        : s.activeRepoId
+          ? (s.repos.find((repo) => repo.id === s.activeRepoId) ?? null)
+          : null
+  )
+  const repoTarget = useMemo(
+    () =>
+      repoForTarget
+        ? { repoPath: repoForTarget.path, connectionId: repoForTarget.connectionId ?? null }
+        : repoPath
+          ? { repoPath }
+          : {},
+    [repoForTarget, repoPath]
+  )
   const { isPending, run } = useImmediateMutation()
   // Why: when the dialog opens from a Project view, mutations route through
   // *BySlug IPCs and we must keep `projectViewCache` in sync alongside
@@ -5168,7 +5216,7 @@ function GHEditSection({
     projectOrigin ? null : repoId,
     sourceSettings
   )
-  const repoLabelsBySlug = useRepoLabelsBySlug(slugOwner, slugRepo, sourceSettings)
+  const repoLabelsBySlug = useRepoLabelsBySlug(slugOwner, slugRepo, sourceSettings, repoTarget)
   const repoLabels = projectOrigin ? repoLabelsBySlug : repoLabelsByPath
   const repositoryLabelsUrl = useMemo(() => getGitHubRepositoryLabelsUrl(item.url), [item.url])
   const repoAssigneesByPath = useRepoAssignees(
@@ -5176,7 +5224,13 @@ function GHEditSection({
     projectOrigin ? null : repoId,
     sourceSettings
   )
-  const repoAssigneesBySlug = useRepoAssigneesBySlug(slugOwner, slugRepo, assignees, sourceSettings)
+  const repoAssigneesBySlug = useRepoAssigneesBySlug(
+    slugOwner,
+    slugRepo,
+    assignees,
+    sourceSettings,
+    repoTarget
+  )
   const repoAssignees = projectOrigin ? repoAssigneesBySlug : repoAssigneesByPath
   const hasAttachedWorkspace =
     attachedWorkspaceLabel !== null && attachedWorkspaceLabel !== undefined
diff --git a/src/renderer/src/components/github-item-dialog-source-boundary.test.ts b/src/renderer/src/components/github-item-dialog-source-boundary.test.ts
index 83c8b3cac47..101e6f906c0 100644
--- a/src/renderer/src/components/github-item-dialog-source-boundary.test.ts
+++ b/src/renderer/src/components/github-item-dialog-source-boundary.test.ts
@@ -44,7 +44,11 @@ describe('GitHubItemDialog source host boundaries', () => {
 
     expect(section).toContain('getTaskSourceRuntimeSettings(sourceContext)')
     expect(section).toContain('useRepoLabels(')
-    expect(section).toContain('useRepoLabelsBySlug(slugOwner, slugRepo, sourceSettings)')
+    // Why (issue #1715): the slug lookups gained a trailing repoTarget arg for
+    // multi-host gh routing; sourceSettings must still be the source-routing arg.
+    expect(section).toContain(
+      'useRepoLabelsBySlug(slugOwner, slugRepo, sourceSettings, repoTarget)'
+    )
     expect(section).toContain('useRepoAssignees(')
     expect(section).toContain('useRepoAssigneesBySlug(')
     expect(section).toContain('sourceSettings')
diff --git a/src/renderer/src/components/github-project/GhAuthErrorHelp.tsx b/src/renderer/src/components/github-project/GhAuthErrorHelp.tsx
index 9131094bdc7..562a8780714 100644
--- a/src/renderer/src/components/github-project/GhAuthErrorHelp.tsx
+++ b/src/renderer/src/components/github-project/GhAuthErrorHelp.tsx
@@ -8,11 +8,12 @@
  * a one-shot diagnostic and rewrites the suggested fix to match what gh
  * is actually doing: env-shadow vs. plain missing-scope vs. not-installed.
  */
-import { useEffect, useState } from 'react'
+import { useEffect, useMemo, useState } from 'react'
 import { Copy, ExternalLink, RotateCw } from 'lucide-react'
 import { toast } from 'sonner'
 import { Button } from '@/components/ui/button'
-import type { GitHubProjectViewError } from '@/../../shared/github-project-types'
+import { useAppStore } from '@/store'
+import type { GitHubProjectViewError, GitHubRepoTarget } from '@/../../shared/github-project-types'
 import type { GhAuthDiagnostic } from '@/../../shared/github-auth-types'
 import { translate } from '@/i18n/i18n'
 
@@ -248,10 +249,29 @@ export function GhAuthErrorHelp({
   variant?: 'block' | 'banner'
 }): React.JSX.Element {
   const [diag, setDiag] = useState<GhAuthDiagnostic | null>(null)
+  // Why (issue #1715): pass the active repo as a host hint so `gh auth status`
+  // reads scope/auth info for the host that owns the repo instead of gh's
+  // globally-active host. Without this, multi-host setups (github.com + GHES)
+  // see remediation tailored to the wrong host's account.
+  const activeRepoId = useAppStore((s) => s.activeRepoId)
+  const repos = useAppStore((s) => s.repos)
+  const activeRepoTarget = useMemo<GitHubRepoTarget>(() => {
+    const repo = activeRepoId ? repos.find((r) => r.id === activeRepoId) : null
+    if (!repo) {
+      return {}
+    }
+    return { repoPath: repo.path, connectionId: repo.connectionId ?? null }
+  }, [activeRepoId, repos])
+  const repoPath = activeRepoTarget.repoPath
+  const connectionId = activeRepoTarget.connectionId
   useEffect(() => {
     let cancelled = false
+    const target: GitHubRepoTarget = {
+      ...(repoPath ? { repoPath } : {}),
+      ...(connectionId !== undefined ? { connectionId } : {})
+    }
     window.api.gh
-      .diagnoseAuth()
+      .diagnoseAuth(target)
       .then((d) => {
         if (!cancelled) {
           setDiag(d)
@@ -262,7 +282,7 @@ export function GhAuthErrorHelp({
     return () => {
       cancelled = true
     }
-  }, [])
+  }, [repoPath, connectionId])
 
   const remedy = buildRemediation(error.message, error.type, diag)
   const docsUrl = remedy.docsUrl
diff --git a/src/renderer/src/components/github-project/ProjectCell.tsx b/src/renderer/src/components/github-project/ProjectCell.tsx
index b9642d0c2e8..85ca4983284 100644
--- a/src/renderer/src/components/github-project/ProjectCell.tsx
+++ b/src/renderer/src/components/github-project/ProjectCell.tsx
@@ -16,6 +16,7 @@ import { useAppStore } from '@/store'
 import { callRuntimeRpc, getActiveRuntimeTarget } from '@/runtime/runtime-rpc-client'
 import { useRepoSlugIndex } from '@/lib/repo-slug-index'
 import { getSettingsForRepoRuntimeOwner } from '@/lib/repo-runtime-owner'
+import { activeGitHubRepoTargetFromState } from '@/lib/github-active-repo-target'
 import type {
   GitHubIssueType,
   GitHubProjectField,
@@ -323,6 +324,15 @@ function IssueTypeCell({
   const [open, setOpen] = useState(false)
   const [options, setOptions] = useState<GitHubIssueType[]>([])
   const [loading, setLoading] = useState(false)
+  // Why (issue #1715): route the issue-type lookup to the host that owns the
+  // active repo. Memoized on primitive ids so a fresh target per render
+  // doesn't refire the effect.
+  const activeRepoId = useAppStore((s) => s.activeRepoId)
+  const repos = useAppStore((s) => s.repos)
+  const repoTarget = React.useMemo(
+    () => activeGitHubRepoTargetFromState({ activeRepoId, repos }),
+    [activeRepoId, repos]
+  )
   const [owner, repo] = (row.content.repository ?? '').split('/')
   const { lookupSlug } = useRepoSlugIndex()
   const matchedRepo = useMemo(
@@ -340,15 +350,16 @@ function IssueTypeCell({
     let cancelled = false
     setLoading(true)
     const target = getActiveRuntimeTarget(matchedRepo ? ownerSettings : sourceSettings)
+    const args = { ...repoTarget, owner, repo }
     const request =
       target.kind === 'environment'
         ? callRuntimeRpc<ListIssueTypesBySlugResult>(
             target,
             'github.project.listIssueTypesBySlug',
-            { owner, repo },
+            args,
             { timeoutMs: 30_000 }
           )
-        : window.api.gh.listIssueTypesBySlug({ owner, repo })
+        : window.api.gh.listIssueTypesBySlug(args)
     request
       .then((res) => {
         if (cancelled) {
@@ -366,7 +377,7 @@ function IssueTypeCell({
     return () => {
       cancelled = true
     }
-  }, [matchedRepo, open, owner, ownerSettings, repo, sourceSettings])
+  }, [matchedRepo, open, owner, ownerSettings, repo, sourceSettings, repoTarget])
 
   const trigger = (
     <span className="inline-flex items-center gap-1 text-xs">
@@ -828,6 +839,14 @@ function AssigneesCell({
 }): React.JSX.Element {
   const assignees = row.content.assignees
   const [open, setOpen] = useState(false)
+  // Why (issue #1715): route the assignee lookup to the host that owns the
+  // active repo. Memoized on primitive ids to keep the IPC stable.
+  const activeRepoId = useAppStore((s) => s.activeRepoId)
+  const repos = useAppStore((s) => s.repos)
+  const repoTarget = React.useMemo(
+    () => activeGitHubRepoTargetFromState({ activeRepoId, repos }),
+    [activeRepoId, repos]
+  )
 
   const [owner, repo] = (row.content.repository ?? '').split('/')
 
@@ -849,7 +868,8 @@ function AssigneesCell({
     open ? owner : null,
     open ? repo : null,
     seedKey ? seedKey.split(',') : [],
-    sourceSettings
+    sourceSettings,
+    repoTarget
   )
 
   const labelContent =
@@ -943,9 +963,22 @@ function LabelsCell({
 }): React.JSX.Element {
   const labels = row.content.labels
   const [open, setOpen] = useState(false)
+  // Why (issue #1715): route the label lookup to the host that owns the
+  // active repo. Memoized on primitive ids to keep the IPC stable.
+  const activeRepoId = useAppStore((s) => s.activeRepoId)
+  const repos = useAppStore((s) => s.repos)
+  const repoTarget = React.useMemo(
+    () => activeGitHubRepoTargetFromState({ activeRepoId, repos }),
+    [activeRepoId, repos]
+  )
 
   const [owner, repo] = (row.content.repository ?? '').split('/')
-  const metadata = useRepoLabelsBySlug(open ? owner : null, open ? repo : null, sourceSettings)
+  const metadata = useRepoLabelsBySlug(
+    open ? owner : null,
+    open ? repo : null,
+    sourceSettings,
+    repoTarget
+  )
 
   const labelContent =
     labels.length === 0 ? null : labels.map((l) => <LabelChip key={l.name} label={l} />)
diff --git a/src/renderer/src/components/github-project/ProjectPicker.tsx b/src/renderer/src/components/github-project/ProjectPicker.tsx
index de2f2710dd2..50f832293c3 100644
--- a/src/renderer/src/components/github-project/ProjectPicker.tsx
+++ b/src/renderer/src/components/github-project/ProjectPicker.tsx
@@ -20,6 +20,7 @@ import type {
   GitHubProjectSummary,
   GitHubProjectViewError,
   GitHubProjectViewSummary,
+  GitHubRepoTarget,
   ListAccessibleProjectsResult,
   ListProjectViewsResult,
   ResolveProjectRefResult
@@ -47,6 +48,12 @@ type Props = {
     title?: string
   } | null
   onSelect: (selection: ResolvedProjectSelection) => void
+  // Why (issue #1715): repo target hint so the picker's gh calls land on the
+  // right host in multi-host setups (e.g. github.com + GHES). The wrapping
+  // ProjectViewWrapper derives this from the active worktree's owning repo;
+  // main resolves the gh API host from that repo's git remote. Omit both to
+  // accept gh's globally-active host (legitimate when no repo context exists).
+  repoTarget?: GitHubRepoTarget
 }
 
 const BROWSE_CACHE_TTL_MS = 5 * 60_000
@@ -56,6 +63,9 @@ type BrowseCacheEntry = {
   partialFailures?: { owner: string; message: string }[]
 }
 
+// Why (issue #1715): the cache is keyed by both the runtime scope AND the
+// repo-target routing key so a GHES vs github.com switch (or runtime switch)
+// can't serve projects discovered against the wrong host.
 const browseCacheByRuntimeScope = new Map<string, BrowseCacheEntry>()
 
 function getProjectPickerRuntimeScope(
@@ -65,51 +75,72 @@ function getProjectPickerRuntimeScope(
   return target.kind === 'environment' ? `runtime:${target.environmentId}` : 'local'
 }
 
+function repoTargetCacheKey(repoTarget: GitHubRepoTarget): string {
+  return `${repoTarget.connectionId ?? 'local'}:${repoTarget.repoPath ?? ''}`
+}
+
 async function listAccessibleProjectsForRuntime(
-  settings: Parameters<typeof getActiveRuntimeTarget>[0]
+  settings: Parameters<typeof getActiveRuntimeTarget>[0],
+  repoTarget: GitHubRepoTarget
 ): Promise<ListAccessibleProjectsResult> {
   const target = getActiveRuntimeTarget(settings)
   return target.kind === 'environment'
     ? callRuntimeRpc<ListAccessibleProjectsResult>(
         target,
         'github.project.listAccessible',
-        {},
+        repoTarget,
         { timeoutMs: 60_000 }
       )
-    : window.api.gh.listAccessibleProjects()
+    : window.api.gh.listAccessibleProjects(repoTarget)
 }
 
 async function listProjectViewsForRuntime(
   settings: Parameters<typeof getActiveRuntimeTarget>[0],
-  args: { owner: string; ownerType: GitHubProjectOwnerType; projectNumber: number }
+  args: { owner: string; ownerType: GitHubProjectOwnerType; projectNumber: number },
+  repoTarget: GitHubRepoTarget
 ): Promise<ListProjectViewsResult> {
   const target = getActiveRuntimeTarget(settings)
+  const payload = { ...args, ...repoTarget }
   return target.kind === 'environment'
-    ? callRuntimeRpc<ListProjectViewsResult>(target, 'github.project.listViews', args, {
+    ? callRuntimeRpc<ListProjectViewsResult>(target, 'github.project.listViews', payload, {
         timeoutMs: 30_000
       })
-    : window.api.gh.listProjectViews(args)
+    : window.api.gh.listProjectViews(payload)
 }
 
 async function resolveProjectRefForRuntime(
   settings: Parameters<typeof getActiveRuntimeTarget>[0],
-  input: string
+  input: string,
+  repoTarget: GitHubRepoTarget
 ): Promise<ResolveProjectRefResult> {
   const target = getActiveRuntimeTarget(settings)
+  const payload = { input, ...repoTarget }
   return target.kind === 'environment'
-    ? callRuntimeRpc<ResolveProjectRefResult>(
-        target,
-        'github.project.resolveRef',
-        { input },
-        { timeoutMs: 30_000 }
-      )
-    : window.api.gh.resolveProjectRef({ input })
+    ? callRuntimeRpc<ResolveProjectRefResult>(target, 'github.project.resolveRef', payload, {
+        timeoutMs: 30_000
+      })
+    : window.api.gh.resolveProjectRef(payload)
 }
 
-export default function ProjectPicker({ activeProject, onSelect }: Props): React.JSX.Element {
+export default function ProjectPicker({
+  activeProject,
+  onSelect,
+  repoTarget
+}: Props): React.JSX.Element {
   const settings = useAppStore((s) => s.settings)
   const updateSettings = useAppStore((s) => s.updateSettings)
   const mountedRef = useMountedRef()
+  // Why (issue #1715): stable wire payload for gh routing. Memoized on the
+  // primitive fields so a new object identity on every render doesn't bust
+  // useCallback caches (loadBrowse, handleChooseProject, handlePaste).
+  const ghRepoTarget = useMemo<GitHubRepoTarget>(
+    () => ({
+      ...(repoTarget?.repoPath ? { repoPath: repoTarget.repoPath } : {}),
+      ...(repoTarget?.connectionId !== undefined ? { connectionId: repoTarget.connectionId } : {})
+    }),
+    [repoTarget?.repoPath, repoTarget?.connectionId]
+  )
+  const ghRepoTargetKey = useMemo(() => repoTargetCacheKey(ghRepoTarget), [ghRepoTarget])
   const projectSettings: GitHubProjectSettings = useMemo(
     () =>
       settings?.githubProjects ?? {
@@ -125,7 +156,8 @@ export default function ProjectPicker({ activeProject, onSelect }: Props): React
   const [query, setQuery] = useState('')
   const [browseLoading, setBrowseLoading] = useState(false)
   const [browseError, setBrowseError] = useState<GitHubProjectViewError | null>(null)
-  const browseCache = browseCacheByRuntimeScope.get(getProjectPickerRuntimeScope(settings))
+  const browseCacheKey = `${getProjectPickerRuntimeScope(settings)}:${ghRepoTargetKey}`
+  const browseCache = browseCacheByRuntimeScope.get(browseCacheKey)
   const [browseProjects, setBrowseProjects] = useState<GitHubProjectSummary[]>(
     () => browseCache?.projects ?? []
   )
@@ -146,7 +178,7 @@ export default function ProjectPicker({ activeProject, onSelect }: Props): React
   const [viewLoading, setViewLoading] = useState(false)
 
   const loadBrowse = useCallback(async () => {
-    const cacheKey = getProjectPickerRuntimeScope(settings)
+    const cacheKey = `${getProjectPickerRuntimeScope(settings)}:${ghRepoTargetKey}`
     const cached = browseCacheByRuntimeScope.get(cacheKey) ?? null
     if (cached && Date.now() - cached.fetchedAt < BROWSE_CACHE_TTL_MS) {
       setBrowseProjects(cached.projects)
@@ -156,7 +188,7 @@ export default function ProjectPicker({ activeProject, onSelect }: Props): React
     setBrowseLoading(true)
     setBrowseError(null)
     try {
-      const res = await listAccessibleProjectsForRuntime(settings)
+      const res = await listAccessibleProjectsForRuntime(settings, ghRepoTarget)
       if (res.ok) {
         browseCacheByRuntimeScope.set(cacheKey, {
           fetchedAt: Date.now(),
@@ -186,7 +218,21 @@ export default function ProjectPicker({ activeProject, onSelect }: Props): React
         setBrowseLoading(false)
       }
     }
-  }, [mountedRef, settings])
+  }, [mountedRef, settings, ghRepoTarget, ghRepoTargetKey])
+
+  // Why (issue #1715): when the repo-target routing key changes (repo switch),
+  // rehydrate from the matching cache entry or clear so stale projects from
+  // the previous host don't linger.
+  useEffect(() => {
+    const cached = browseCacheByRuntimeScope.get(browseCacheKey)
+    if (cached) {
+      setBrowseProjects(cached.projects)
+      setPartialFailures(cached.partialFailures ?? [])
+      return
+    }
+    setBrowseProjects([])
+    setPartialFailures([])
+  }, [browseCacheKey])
 
   useEffect(() => {
     if (open && !viewPickFor) {
@@ -282,11 +328,15 @@ export default function ProjectPicker({ activeProject, onSelect }: Props): React
       })
       setViewLoading(true)
       try {
-        const res = await listProjectViewsForRuntime(settings, {
-          owner: selection.owner,
-          ownerType: selection.ownerType,
-          projectNumber: selection.number
-        })
+        const res = await listProjectViewsForRuntime(
+          settings,
+          {
+            owner: selection.owner,
+            ownerType: selection.ownerType,
+            projectNumber: selection.number
+          },
+          ghRepoTarget
+        )
         if (!mountedRef.current) {
           return
         }
@@ -336,7 +386,7 @@ export default function ProjectPicker({ activeProject, onSelect }: Props): React
         }
       }
     },
-    [commitSelection, mountedRef, projectSettings.lastViewByProject, settings]
+    [commitSelection, mountedRef, projectSettings.lastViewByProject, settings, ghRepoTarget]
   )
 
   const handlePaste = useCallback(async () => {
@@ -353,7 +403,7 @@ export default function ProjectPicker({ activeProject, onSelect }: Props): React
     setPasteError(null)
     setPasteBusy(true)
     try {
-      const res = await resolveProjectRefForRuntime(settings, input)
+      const res = await resolveProjectRefForRuntime(settings, input, ghRepoTarget)
       if (!mountedRef.current) {
         return
       }
@@ -376,7 +426,7 @@ export default function ProjectPicker({ activeProject, onSelect }: Props): React
         setPasteBusy(false)
       }
     }
-  }, [handleChooseProject, mountedRef, pasteInput, settings])
+  }, [handleChooseProject, mountedRef, pasteInput, settings, ghRepoTarget])
 
   const canSubmitPasteInput = !pasteBusy && hasBoundedGitHubProjectRefInputText(pasteInput)
 
@@ -822,7 +872,10 @@ function parseProjectInput(
   }
   try {
     const url = new URL(input)
-    if (url.hostname !== 'github.com') {
+    // Why (issue #1715): accept any host so GHES project URLs parse. The host
+    // itself is re-parsed by the main process resolver for explicit host
+    // routing. Require at least one dot to reject obvious garbage hosts.
+    if (!url.hostname.includes('.')) {
       return null
     }
     const parts = url.pathname.split('/').filter(Boolean)
diff --git a/src/renderer/src/components/github-project/ProjectViewWrapper.tsx b/src/renderer/src/components/github-project/ProjectViewWrapper.tsx
index f9c8a4ceee7..82b7ebb5491 100644
--- a/src/renderer/src/components/github-project/ProjectViewWrapper.tsx
+++ b/src/renderer/src/components/github-project/ProjectViewWrapper.tsx
@@ -41,6 +41,7 @@ import type {
   GitHubProjectTable,
   GitHubProjectViewError,
   GitHubProjectViewSummary,
+  GitHubRepoTarget,
   ListProjectViewsResult
 } from '../../../../shared/github-project-types'
 import type { GitHubWorkItem } from '../../../../shared/types'
@@ -71,14 +72,18 @@ const ORCA_FEATURE_REQUEST_URL = 'https://github.com/stablyai/orca/issues/new'
 
 function listProjectViewsForRuntime(
   settings: Parameters<typeof getActiveRuntimeTarget>[0],
-  args: { owner: string; ownerType: 'organization' | 'user'; projectNumber: number }
+  args: { owner: string; ownerType: 'organization' | 'user'; projectNumber: number },
+  repoTarget: GitHubRepoTarget
 ): Promise<ListProjectViewsResult> {
   const target = getActiveRuntimeTarget(settings)
+  // Why (issue #1715): merge the repo-routing hint into the IPC/RPC payload
+  // so listProjectViews lands on the host that owns the active repo.
+  const payload = { ...repoTarget, ...args }
   return target.kind === 'environment'
-    ? callRuntimeRpc<ListProjectViewsResult>(target, 'github.project.listViews', args, {
+    ? callRuntimeRpc<ListProjectViewsResult>(target, 'github.project.listViews', payload, {
         timeoutMs: 30_000
       })
-    : window.api.gh.listProjectViews(args)
+    : window.api.gh.listProjectViews(payload)
 }
 
 function getProjectViewSourceScope(settings: Parameters<typeof getActiveRuntimeTarget>[0]): string {
@@ -96,11 +101,26 @@ export default function ProjectViewWrapper({ selectedRepoIds }: Props): React.JS
   const patchProjectRowIssueType = useAppStore((s) => s.patchProjectRowIssueType)
   const addRepoFromStore = useAppStore((s) => s.addRepo)
   const repos = useAppStore((s) => s.repos)
+  const activeRepoId = useAppStore((s) => s.activeRepoId)
   const { lookupSlug, ready: slugIndexReady } = useRepoSlugIndex()
   const mountedRef = useMountedRef()
 
   const activeProject = settings?.githubProjects?.activeProject ?? null
   const projectViewSourceScope = useMemo(() => getProjectViewSourceScope(settings), [settings])
+  // Why (issue #1715): pass the active repo as a gh-host hint to all
+  // project-related gh calls (picker, project view fetch, mutations). gh
+  // resolves the API host from that repo's git remote; without this, GHES
+  // users hit github.com and see misleading scope errors.
+  const activeRepoTarget = useMemo<GitHubRepoTarget>(() => {
+    const repo = activeRepoId ? repos.find((r) => r.id === activeRepoId) : null
+    if (!repo) {
+      return {}
+    }
+    return {
+      repoPath: repo.path,
+      connectionId: repo.connectionId ?? null
+    }
+  }, [activeRepoId, repos])
   const lastViewByProject = useMemo(
     () => settings?.githubProjects?.lastViewByProject ?? {},
     [settings?.githubProjects?.lastViewByProject]
@@ -192,7 +212,8 @@ export default function ProjectViewWrapper({ selectedRepoIds }: Props): React.JS
       activeProject.number,
       viewId,
       queryOverride,
-      projectViewSourceScope
+      projectViewSourceScope,
+      activeRepoTarget
     )
     if (projectViewCache[cacheKey]?.data) {
       return
@@ -213,7 +234,8 @@ export default function ProjectViewWrapper({ selectedRepoIds }: Props): React.JS
     projectViewCache,
     doFetch,
     appliedQueryByView,
-    projectViewSourceScope
+    projectViewSourceScope,
+    activeRepoTarget
   ])
 
   // Load the project's view list whenever the active project changes so the
@@ -228,11 +250,15 @@ export default function ProjectViewWrapper({ selectedRepoIds }: Props): React.JS
       return
     }
     let cancelled = false
-    void listProjectViewsForRuntime(settings, {
-      owner: activeProject.owner,
-      ownerType: activeProject.ownerType,
-      projectNumber: activeProject.number
-    })
+    void listProjectViewsForRuntime(
+      settings,
+      {
+        owner: activeProject.owner,
+        ownerType: activeProject.ownerType,
+        projectNumber: activeProject.number
+      },
+      activeRepoTarget
+    )
       .then((res) => {
         if (cancelled) {
           return
@@ -254,7 +280,7 @@ export default function ProjectViewWrapper({ selectedRepoIds }: Props): React.JS
     return () => {
       cancelled = true
     }
-  }, [activeProject, viewListByProject, settings, projectViewSourceScope])
+  }, [activeProject, viewListByProject, settings, projectViewSourceScope, activeRepoTarget])
 
   const handleSwitchView = useCallback(
     async (viewId: string) => {
@@ -328,9 +354,16 @@ export default function ProjectViewWrapper({ selectedRepoIds }: Props): React.JS
       activeProject.number,
       viewId,
       currentAppliedOverride,
-      projectViewSourceScope
+      projectViewSourceScope,
+      activeRepoTarget
     )
-  }, [activeProject, lastViewByProject, currentAppliedOverride, projectViewSourceScope])
+  }, [
+    activeProject,
+    lastViewByProject,
+    currentAppliedOverride,
+    projectViewSourceScope,
+    activeRepoTarget
+  ])
 
   const table: GitHubProjectTable | null = currentCacheKey
     ? (projectViewCache[currentCacheKey]?.data ?? null)
@@ -764,6 +797,7 @@ export default function ProjectViewWrapper({ selectedRepoIds }: Props): React.JS
                 : null
           }
           onSelect={handleSelect}
+          repoTarget={activeRepoTarget}
         />
         {currentProjectViewKey ? (
           // Why: render the search input whenever a view is selected — even
diff --git a/src/renderer/src/components/github-project/slug-dialog/AssigneesEditor.tsx b/src/renderer/src/components/github-project/slug-dialog/AssigneesEditor.tsx
index ded043e3d68..317f98f3ced 100644
--- a/src/renderer/src/components/github-project/slug-dialog/AssigneesEditor.tsx
+++ b/src/renderer/src/components/github-project/slug-dialog/AssigneesEditor.tsx
@@ -2,6 +2,8 @@ import React, { useMemo, useState } from 'react'
 import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover'
 import { cn } from '@/lib/utils'
 import { useRepoAssigneesBySlug } from '@/hooks/useGitHubSlugMetadata'
+import { useAppStore } from '@/store'
+import { activeGitHubRepoTargetFromState } from '@/lib/github-active-repo-target'
 import type { GlobalSettings } from '../../../../../shared/types'
 import { translate } from '@/i18n/i18n'
 
@@ -21,6 +23,16 @@ export function AssigneesEditor({
   onChange: (add: string[], remove: string[]) => void | Promise<void>
 }): React.JSX.Element {
   const [open, setOpen] = useState(false)
+  // Why (issue #1715): route the assignee lookup to the host that owns the
+  // active repo so GHES projects don't fall through to gh's global host.
+  // Memoized on the primitive id so a fresh target object per render doesn't
+  // refire the metadata IPC.
+  const activeRepoId = useAppStore((s) => s.activeRepoId)
+  const repos = useAppStore((s) => s.repos)
+  const repoTarget = useMemo(
+    () => activeGitHubRepoTargetFromState({ activeRepoId, repos }),
+    [activeRepoId, repos]
+  )
   // Why: stabilize the assignee seed identity. `selected` is a fresh array on
   // every parent render — depending on it directly would refire the IPC for
   // every unrelated re-render while the popover is open.
@@ -29,7 +41,8 @@ export function AssigneesEditor({
     open ? owner : null,
     open ? repo : null,
     seedKey ? seedKey.split(',') : [],
-    sourceSettings
+    sourceSettings,
+    repoTarget
   )
   return (
     <Popover open={open} onOpenChange={(o) => !disabled && setOpen(o)}>
diff --git a/src/renderer/src/components/github-project/slug-dialog/Comments.tsx b/src/renderer/src/components/github-project/slug-dialog/Comments.tsx
index 95470618a81..979181d5b51 100644
--- a/src/renderer/src/components/github-project/slug-dialog/Comments.tsx
+++ b/src/renderer/src/components/github-project/slug-dialog/Comments.tsx
@@ -14,6 +14,7 @@ import { useRepoSlugIndex } from '@/lib/repo-slug-index'
 import { getSettingsForRepoRuntimeOwner } from '@/lib/repo-runtime-owner'
 import type { GlobalSettings, PRComment } from '../../../../../shared/types'
 import type {
+  GitHubRepoTarget,
   GitHubProjectCommentMutationResult,
   GitHubProjectMutationResult
 } from '../../../../../shared/github-project-types'
@@ -37,6 +38,21 @@ function useRuntimeSettingsForSlug(owner: string, repo: string) {
   )
 }
 
+// Why (issue #1715): the comment mutations also need the repo-host routing
+// hint so they land on the host that owns the active repo.
+function useActiveRepoTarget(): GitHubRepoTarget {
+  const activeRepo = useAppStore((s) =>
+    s.activeRepoId ? (s.repos.find((repo) => repo.id === s.activeRepoId) ?? null) : null
+  )
+  return useMemo(
+    () =>
+      activeRepo
+        ? { repoPath: activeRepo.path, connectionId: activeRepo.connectionId ?? null }
+        : {},
+    [activeRepo]
+  )
+}
+
 export function CommentsList({
   owner,
   repo,
@@ -52,6 +68,7 @@ export function CommentsList({
 }): React.JSX.Element {
   const fallbackRuntimeSettings = useRuntimeSettingsForSlug(owner, repo)
   const runtimeSettings = sourceSettings ?? fallbackRuntimeSettings
+  const repoTarget = useActiveRepoTarget()
   return (
     <div className="flex flex-col gap-3">
       {comments.length === 0 ? (
@@ -71,6 +88,7 @@ export function CommentsList({
             onDelete={async () => {
               const target = getRuntimeTarget(runtimeSettings)
               const args = {
+                ...repoTarget,
                 owner,
                 repo,
                 commentId: c.id
@@ -92,6 +110,7 @@ export function CommentsList({
             onEdit={async (next) => {
               const target = getRuntimeTarget(runtimeSettings)
               const args = {
+                ...repoTarget,
                 owner,
                 repo,
                 commentId: c.id,
@@ -201,6 +220,7 @@ export function NewCommentForm({
   const [submitting, setSubmitting] = useState(false)
   const fallbackRuntimeSettings = useRuntimeSettingsForSlug(owner, repo)
   const runtimeSettings = sourceSettings ?? fallbackRuntimeSettings
+  const repoTarget = useActiveRepoTarget()
   const canSubmitComment = hasBoundedCommentBodyText(draft)
   return (
     <div className="flex flex-col gap-2">
@@ -234,7 +254,7 @@ export function NewCommentForm({
             setSubmitting(true)
             try {
               const target = getRuntimeTarget(runtimeSettings)
-              const args = { owner, repo, number, body: bodyState.body }
+              const args = { ...repoTarget, owner, repo, number, body: bodyState.body }
               const res = target
                 ? await callRuntimeRpc<GitHubProjectCommentMutationResult>(
                     target,
diff --git a/src/renderer/src/components/github-project/slug-dialog/LabelsEditor.tsx b/src/renderer/src/components/github-project/slug-dialog/LabelsEditor.tsx
index 1c87fc3fd28..eee717cfe79 100644
--- a/src/renderer/src/components/github-project/slug-dialog/LabelsEditor.tsx
+++ b/src/renderer/src/components/github-project/slug-dialog/LabelsEditor.tsx
@@ -1,7 +1,9 @@
-import React, { useState } from 'react'
+import React, { useMemo, useState } from 'react'
 import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover'
 import { cn } from '@/lib/utils'
 import { useRepoLabelsBySlug } from '@/hooks/useGitHubSlugMetadata'
+import { useAppStore } from '@/store'
+import { activeGitHubRepoTargetFromState } from '@/lib/github-active-repo-target'
 import type { GlobalSettings } from '../../../../../shared/types'
 import { translate } from '@/i18n/i18n'
 
@@ -21,7 +23,21 @@ export function LabelsEditor({
   onChange: (add: string[], remove: string[]) => void | Promise<void>
 }): React.JSX.Element {
   const [open, setOpen] = useState(false)
-  const metadata = useRepoLabelsBySlug(open ? owner : null, open ? repo : null, sourceSettings)
+  // Why (issue #1715): route the label lookup to the host that owns the active
+  // repo. Memoized on the primitive id so a fresh target object per render
+  // doesn't refire the metadata IPC.
+  const activeRepoId = useAppStore((s) => s.activeRepoId)
+  const repos = useAppStore((s) => s.repos)
+  const repoTarget = useMemo(
+    () => activeGitHubRepoTargetFromState({ activeRepoId, repos }),
+    [activeRepoId, repos]
+  )
+  const metadata = useRepoLabelsBySlug(
+    open ? owner : null,
+    open ? repo : null,
+    sourceSettings,
+    repoTarget
+  )
   return (
     <Popover open={open} onOpenChange={(o) => !disabled && setOpen(o)}>
       <PopoverTrigger asChild>
diff --git a/src/renderer/src/components/github-project/slug-dialog/SlugDialogBody.tsx b/src/renderer/src/components/github-project/slug-dialog/SlugDialogBody.tsx
index ad7f9b5eb62..d97d1ec6116 100644
--- a/src/renderer/src/components/github-project/slug-dialog/SlugDialogBody.tsx
+++ b/src/renderer/src/components/github-project/slug-dialog/SlugDialogBody.tsx
@@ -27,6 +27,16 @@ export function SlugDialogBody({
   const { owner, repo, number, type, cacheKey } = projectOrigin
   const patchProjectIssueOrPr = useAppStore((s) => s.patchProjectIssueOrPr)
   const projectViewCache = useAppStore((s) => s.projectViewCache)
+  const activeRepo = useAppStore((s) =>
+    s.activeRepoId ? (s.repos.find((candidate) => candidate.id === s.activeRepoId) ?? null) : null
+  )
+  const repoTarget = useMemo(
+    () =>
+      activeRepo
+        ? { repoPath: activeRepo.path, connectionId: activeRepo.connectionId ?? null }
+        : {},
+    [activeRepo]
+  )
 
   // Why: the Project row is the source of truth for the list-side columns;
   // reading it reactively here keeps the dialog in sync with optimistic
@@ -57,6 +67,9 @@ export function SlugDialogBody({
     setError(null)
     setDetails(null)
     const target = getActiveRuntimeTarget(sourceSettings)
+    // Why (issue #1715): thread the repo-host routing hint through both the
+    // runtime RPC and the local IPC so the details lookup lands on the host
+    // that owns the active repo (github.com vs GHES).
     const request =
       target.kind === 'environment'
         ? callRuntimeRpc<
@@ -64,10 +77,10 @@ export function SlugDialogBody({
           >(
             target,
             'github.project.workItemDetailsBySlug',
-            { owner, repo, number, type },
+            { ...repoTarget, owner, repo, number, type },
             { timeoutMs: 30_000 }
           )
-        : window.api.gh.projectWorkItemDetailsBySlug({ owner, repo, number, type })
+        : window.api.gh.projectWorkItemDetailsBySlug({ ...repoTarget, owner, repo, number, type })
     request
       .then((res) => {
         if (rid !== requestIdRef.current) {
@@ -91,7 +104,7 @@ export function SlugDialogBody({
         }
         setLoading(false)
       })
-  }, [owner, repo, number, type, sourceSettings])
+  }, [owner, repo, number, type, sourceSettings, repoTarget])
 
   const title = row?.content.title ?? details?.item.title ?? ''
   const url = row?.content.url ?? details?.item.url ?? null
diff --git a/src/renderer/src/hooks/useGitHubSlugMetadata.ts b/src/renderer/src/hooks/useGitHubSlugMetadata.ts
index 26022191fcc..12265b7f5fc 100644
--- a/src/renderer/src/hooks/useGitHubSlugMetadata.ts
+++ b/src/renderer/src/hooks/useGitHubSlugMetadata.ts
@@ -9,6 +9,7 @@ import { useEffect, useRef, useState } from 'react'
 import { callRuntimeRpc, getActiveRuntimeTarget } from '@/runtime/runtime-rpc-client'
 import type { GitHubAssignableUser, GlobalSettings } from '../../../shared/types'
 import type {
+  GitHubRepoTarget,
   ListAssignableUsersBySlugResult,
   ListLabelsBySlugResult
 } from '../../../shared/github-project-types'
@@ -33,10 +34,15 @@ export function clearGitHubSlugMetadataCache(): void {
   clearMetadataRequestStore(slugAssigneeStore)
 }
 
+function repoTargetKey(repoTarget?: GitHubRepoTarget): string {
+  return `${repoTarget?.connectionId ?? 'local'}:${repoTarget?.repoPath ?? ''}`
+}
+
 export function useRepoLabelsBySlug(
   owner: string | null,
   repo: string | null,
-  settings?: Pick<GlobalSettings, 'activeRuntimeEnvironmentId'> | null
+  settings?: Pick<GlobalSettings, 'activeRuntimeEnvironmentId'> | null,
+  repoTarget?: GitHubRepoTarget
 ): MetadataState<string[]> {
   const [state, setState] = useState<MetadataState<string[]>>({
     data: [],
@@ -50,10 +56,11 @@ export function useRepoLabelsBySlug(
       return
     }
     const target = getActiveRuntimeTarget(settings)
+    const routeKey = repoTargetKey(repoTarget)
     const key =
       target.kind === 'environment'
-        ? `runtime:${target.environmentId}:${owner}/${repo}`
-        : `${owner}/${repo}`
+        ? `runtime:${target.environmentId}:${routeKey}:${owner}/${repo}`
+        : `${routeKey}:${owner}/${repo}`
 
     const cached = getFreshMetadata(slugLabelStore, key)
     if (cached) {
@@ -82,10 +89,10 @@ export function useRepoLabelsBySlug(
         ? callRuntimeRpc<ListLabelsBySlugResult>(
             target,
             'github.project.listLabelsBySlug',
-            { owner, repo },
+            { ...repoTarget, owner, repo },
             { timeoutMs: 30_000 }
           )
-        : window.api.gh.listLabelsBySlug({ owner, repo })
+        : window.api.gh.listLabelsBySlug({ ...repoTarget, owner, repo })
       ).then((res) => {
         if (!res.ok) {
           throw new Error(res.error.message)
@@ -110,7 +117,7 @@ export function useRepoLabelsBySlug(
           error: err instanceof Error ? err.message : 'Failed to load labels'
         }))
       })
-  }, [owner, repo, settings])
+  }, [owner, repo, settings, repoTarget])
 
   return state
 }
@@ -119,7 +126,8 @@ export function useRepoAssigneesBySlug(
   owner: string | null,
   repo: string | null,
   seedLogins?: string[],
-  settings?: Pick<GlobalSettings, 'activeRuntimeEnvironmentId'> | null
+  settings?: Pick<GlobalSettings, 'activeRuntimeEnvironmentId'> | null,
+  repoTarget?: GitHubRepoTarget
 ): MetadataState<GitHubAssignableUser[]> {
   const [state, setState] = useState<MetadataState<GitHubAssignableUser[]>>({
     data: [],
@@ -137,10 +145,11 @@ export function useRepoAssigneesBySlug(
       return
     }
     const target = getActiveRuntimeTarget(settings)
+    const routeKey = repoTargetKey(repoTarget)
     const key =
       target.kind === 'environment'
-        ? `runtime:${target.environmentId}:${owner}/${repo}#${seedKey}`
-        : `${owner}/${repo}#${seedKey}`
+        ? `runtime:${target.environmentId}:${routeKey}:${owner}/${repo}#${seedKey}`
+        : `${routeKey}:${owner}/${repo}#${seedKey}`
 
     const cached = getFreshMetadata(slugAssigneeStore, key)
     if (cached) {
@@ -165,6 +174,7 @@ export function useRepoAssigneesBySlug(
       error: null
     }))
     const args = {
+      ...repoTarget,
       owner,
       repo,
       ...(seedKey ? { seedLogins: seedKey.split(',') } : {})
@@ -202,7 +212,7 @@ export function useRepoAssigneesBySlug(
           error: err instanceof Error ? err.message : 'Failed to load assignees'
         }))
       })
-  }, [owner, repo, seedKey, settings])
+  }, [owner, repo, seedKey, settings, repoTarget])
 
   return state
 }
diff --git a/src/renderer/src/lib/github-active-repo-target.ts b/src/renderer/src/lib/github-active-repo-target.ts
new file mode 100644
index 00000000000..3e904f844b3
--- /dev/null
+++ b/src/renderer/src/lib/github-active-repo-target.ts
@@ -0,0 +1,12 @@
+import type { AppState } from '@/store/types'
+import type { GitHubRepoTarget } from '../../../shared/github-project-types'
+
+export function activeGitHubRepoTargetFromState(
+  state: Pick<AppState, 'activeRepoId' | 'repos'>
+): GitHubRepoTarget {
+  const repo = state.activeRepoId ? state.repos.find((r) => r.id === state.activeRepoId) : null
+  if (!repo) {
+    return {}
+  }
+  return { repoPath: repo.path, connectionId: repo.connectionId ?? null }
+}
diff --git a/src/renderer/src/store/slices/github.ts b/src/renderer/src/store/slices/github.ts
index 28618d3a8cd..1cf00aaa58e 100644
--- a/src/renderer/src/store/slices/github.ts
+++ b/src/renderer/src/store/slices/github.ts
@@ -30,7 +30,8 @@ import type {
   GitHubProjectMutationResult,
   GitHubProjectRow,
   GitHubProjectTable,
-  GitHubProjectViewError
+  GitHubProjectViewError,
+  GitHubRepoTarget
 } from '../../../../shared/github-project-types'
 import {
   isGitHubWorkItemsSshRemoteRequiredError,
@@ -61,6 +62,7 @@ import {
   getTaskSourceRuntimeSettings,
   type TaskSourceContext
 } from '../../../../shared/task-source-context'
+import { activeGitHubRepoTargetFromState } from '../../lib/github-active-repo-target'
 
 // ─── ProjectV2 cache types ────────────────────────────────────────────
 // Why: declared separately from CacheEntry<T> (not a generified E parameter)
@@ -422,9 +424,14 @@ export function projectViewCacheKey(
   projectNumber: number,
   resolvedViewId: string,
   queryOverride?: string,
-  sourceScope = 'local'
+  sourceScope = 'local',
+  // Why (issue #1715): the repo-host routing hint participates in the cache
+  // key so the same owner/project on github.com vs GHES can't reuse each
+  // other's cached table.
+  repoTarget?: GitHubRepoTarget
 ): string {
-  return `github-project:${sourceScope}:${ownerType}:${owner}:${projectNumber}:${resolvedViewId}${queryOverrideKeyPart(queryOverride)}`
+  const targetKey = `${repoTarget?.connectionId ?? 'local'}:${repoTarget?.repoPath ?? ''}`
+  return `github-project:${sourceScope}:${targetKey}:${ownerType}:${owner}:${projectNumber}:${resolvedViewId}${queryOverrideKeyPart(queryOverride)}`
 }
 
 function projectViewRequestKey(args: GetProjectViewTableArgs, sourceScope: string): string {
@@ -438,7 +445,8 @@ function projectViewRequestKey(args: GetProjectViewTableArgs, sourceScope: strin
       : args.viewName
         ? `name:${args.viewName}`
         : 'default'
-  return `${sourceScope}:${args.ownerType}:${args.owner}:${args.projectNumber}:${selector}${queryOverrideKeyPart(args.queryOverride)}`
+  const targetKey = `${args.connectionId ?? 'local'}:${args.repoPath ?? ''}`
+  return `${sourceScope}:${targetKey}:${args.ownerType}:${args.owner}:${args.projectNumber}:${selector}${queryOverrideKeyPart(args.queryOverride)}`
 }
 
 function projectViewSourceScope(settings: AppState['settings']): string {
@@ -2023,18 +2031,23 @@ export const createGitHubSlice: StateCreator<AppState, [], [], GitHubSlice> = (s
   fetchProjectViewTable: async (args, options) => {
     const target = getActiveRuntimeTarget(get().settings)
     const sourceScope = projectViewSourceScope(get().settings)
-    const requestKey = projectViewRequestKey(args, sourceScope)
+    // Why (issue #1715): include the repo-host routing hint in both the
+    // request and cache identity so same owner/project numbers on different
+    // GitHub hosts cannot reuse each other's data.
+    const payload: GetProjectViewTableArgs = { ...activeGitHubRepoTargetFromState(get()), ...args }
+    const requestKey = projectViewRequestKey(payload, sourceScope)
 
     // Fast path: when the caller supplies `viewId`, we already know the
     // resolved cache key and can serve a fresh entry directly.
-    const maybeKnownKey = args.viewId
+    const maybeKnownKey = payload.viewId
       ? projectViewCacheKey(
-          args.ownerType,
-          args.owner,
-          args.projectNumber,
-          args.viewId,
-          args.queryOverride,
-          sourceScope
+          payload.ownerType,
+          payload.owner,
+          payload.projectNumber,
+          payload.viewId,
+          payload.queryOverride,
+          sourceScope,
+          payload
         )
       : null
     if (!options?.force && maybeKnownKey) {
@@ -2064,10 +2077,10 @@ export const createGitHubSlice: StateCreator<AppState, [], [], GitHubSlice> = (s
             ? await callRuntimeRpc<GetProjectViewTableResult>(
                 target,
                 'github.project.viewTable',
-                args,
+                payload,
                 { timeoutMs: 60_000 }
               )
-            : await window.api.gh.getProjectViewTable(args)
+            : await window.api.gh.getProjectViewTable(payload)
         if (envelope.ok) {
           const table = envelope.data
           const key = projectViewCacheKey(
@@ -2075,8 +2088,9 @@ export const createGitHubSlice: StateCreator<AppState, [], [], GitHubSlice> = (s
             table.project.owner,
             table.project.number,
             table.selectedView.id,
-            args.queryOverride,
-            sourceScope
+            payload.queryOverride,
+            sourceScope,
+            payload
           )
           set((s) => ({
             projectViewCache: withBoundedCacheEntry(s.projectViewCache, key, {
@@ -2159,25 +2173,25 @@ export const createGitHubSlice: StateCreator<AppState, [], [], GitHubSlice> = (s
     applyRowPatch(set, cacheKey, rowId, optimisticRow)
 
     const target = getActiveRuntimeTarget(settingsForProjectViewCacheKey(get().settings, cacheKey))
+    // Why (issue #1715): route the ProjectV2 field-update GraphQL to the
+    // host that owns the active repo so GHES projects don't fall through
+    // to gh's globally-active host (github.com) and 404 / mis-auth.
+    const updatePayload = {
+      ...activeGitHubRepoTargetFromState(state),
+      projectId: table.project.id,
+      itemId: rowId,
+      fieldId,
+      value
+    }
     const result =
       target.kind === 'environment'
         ? await callRuntimeRpc<GitHubProjectMutationResult>(
             target,
             'github.project.updateItemField',
-            {
-              projectId: table.project.id,
-              itemId: rowId,
-              fieldId,
-              value
-            },
+            updatePayload,
             { timeoutMs: 30_000 }
           )
-        : await window.api.gh.updateProjectItemField({
-            projectId: table.project.id,
-            itemId: rowId,
-            fieldId,
-            value
-          })
+        : await window.api.gh.updateProjectItemField(updatePayload)
     if (!result.ok) {
       rollbackRowIfPresent(set, get, cacheKey, rowId, previousRow)
     }
@@ -2217,23 +2231,23 @@ export const createGitHubSlice: StateCreator<AppState, [], [], GitHubSlice> = (s
     applyRowPatch(set, cacheKey, rowId, optimisticRow)
 
     const target = getActiveRuntimeTarget(settingsForProjectViewCacheKey(get().settings, cacheKey))
+    // Why (issue #1715): same host-routing concern as updateProjectFieldValue
+    // — clear-field GraphQL must hit the host that owns the active repo.
+    const clearPayload = {
+      ...activeGitHubRepoTargetFromState(state),
+      projectId: table.project.id,
+      itemId: rowId,
+      fieldId
+    }
     const result =
       target.kind === 'environment'
         ? await callRuntimeRpc<GitHubProjectMutationResult>(
             target,
             'github.project.clearItemField',
-            {
-              projectId: table.project.id,
-              itemId: rowId,
-              fieldId
-            },
+            clearPayload,
             { timeoutMs: 30_000 }
           )
-        : await window.api.gh.clearProjectItemField({
-            projectId: table.project.id,
-            itemId: rowId,
-            fieldId
-          })
+        : await window.api.gh.clearProjectItemField(clearPayload)
     if (!result.ok) {
       rollbackRowIfPresent(set, get, cacheKey, rowId, previousRow)
     }
@@ -2327,11 +2341,15 @@ export const createGitHubSlice: StateCreator<AppState, [], [], GitHubSlice> = (s
         settingsForProjectViewCacheKey(get().settings, cacheKey)
       )
     )
+    // Why (issue #1715): the repo-host routing hint must also flow to the
+    // slug-addressed mutation so it lands on the host that owns the repo.
+    const repoTarget = activeGitHubRepoTargetFromState(state)
     if (
       previousRow.itemType === 'PULL_REQUEST' &&
       (updates.title !== undefined || updates.body !== undefined)
     ) {
       const args = {
+        ...repoTarget,
         owner,
         repo,
         number,
@@ -2363,6 +2381,7 @@ export const createGitHubSlice: StateCreator<AppState, [], [], GitHubSlice> = (s
           (updates.title !== undefined || updates.body !== undefined)))
     ) {
       const args = {
+        ...repoTarget,
         owner,
         repo,
         number,
@@ -2455,7 +2474,11 @@ export const createGitHubSlice: StateCreator<AppState, [], [], GitHubSlice> = (s
         settingsForProjectViewCacheKey(get().settings, cacheKey)
       )
     )
+    // Why (issue #1715): also thread the repo-host routing hint into the
+    // slug-addressed issue-type mutation.
+    const repoTarget = activeGitHubRepoTargetFromState(state)
     const args = {
+      ...repoTarget,
       owner,
       repo,
       number,
diff --git a/src/shared/github-project-types.ts b/src/shared/github-project-types.ts
index 3067aa95260..91c8b55af80 100644
--- a/src/shared/github-project-types.ts
+++ b/src/shared/github-project-types.ts
@@ -327,7 +327,20 @@ export type ListIssueTypesBySlugResult =
 
 // ─── IPC arg shapes (shared between main, preload, renderer) ──────────
 
-export type GetProjectViewTableArgs = {
+/**
+ * Repo target for routing `gh` to the correct host in multi-host setups
+ * (e.g. github.com + GHES). Main resolves the repo's git remote host and
+ * passes it to `gh api --hostname`; local repos also keep `cwd: repoPath`
+ * for repo-context placeholders. When `connectionId` is set the path is read
+ * through the SSH git provider and local cwd is omitted. Both optional —
+ * calls with no repo context accept gh's globally-active host. See issue #1715.
+ */
+export type GitHubRepoTarget = {
+  repoPath?: string
+  connectionId?: string | null
+}
+
+export type GetProjectViewTableArgs = GitHubRepoTarget & {
   owner: string
   ownerType: GitHubProjectOwnerType
   projectNumber: number
@@ -343,77 +356,77 @@ export type GetProjectViewTableArgs = {
   queryOverride?: string
 }
 
-export type ProjectWorkItemDetailsBySlugArgs = {
+export type ProjectWorkItemDetailsBySlugArgs = GitHubRepoTarget & {
   owner: string
   repo: string
   number: number
   type: 'issue' | 'pr'
 }
 
-export type UpdateProjectItemFieldArgs = {
+export type UpdateProjectItemFieldArgs = GitHubRepoTarget & {
   projectId: string
   itemId: string
   fieldId: string
   value: GitHubProjectFieldMutationValue
 }
 
-export type ClearProjectItemFieldArgs = {
+export type ClearProjectItemFieldArgs = GitHubRepoTarget & {
   projectId: string
   itemId: string
   fieldId: string
 }
 
-export type UpdateIssueBySlugArgs = {
+export type UpdateIssueBySlugArgs = GitHubRepoTarget & {
   owner: string
   repo: string
   number: number
   updates: GitHubIssueUpdate & { body?: string }
 }
 
-export type UpdatePullRequestBySlugArgs = {
+export type UpdatePullRequestBySlugArgs = GitHubRepoTarget & {
   owner: string
   repo: string
   number: number
   updates: { title?: string; body?: string; state?: 'open' | 'closed' }
 }
 
-export type AddIssueCommentBySlugArgs = {
+export type AddIssueCommentBySlugArgs = GitHubRepoTarget & {
   owner: string
   repo: string
   number: number
   body: string
 }
 
-export type UpdateIssueCommentBySlugArgs = {
+export type UpdateIssueCommentBySlugArgs = GitHubRepoTarget & {
   owner: string
   repo: string
   commentId: number
   body: string
 }
 
-export type DeleteIssueCommentBySlugArgs = {
+export type DeleteIssueCommentBySlugArgs = GitHubRepoTarget & {
   owner: string
   repo: string
   commentId: number
 }
 
-export type ListLabelsBySlugArgs = {
+export type ListLabelsBySlugArgs = GitHubRepoTarget & {
   owner: string
   repo: string
 }
 
-export type ListAssignableUsersBySlugArgs = {
+export type ListAssignableUsersBySlugArgs = GitHubRepoTarget & {
   owner: string
   repo: string
   seedLogins?: string[]
 }
 
-export type ListIssueTypesBySlugArgs = {
+export type ListIssueTypesBySlugArgs = GitHubRepoTarget & {
   owner: string
   repo: string
 }
 
-export type UpdateIssueTypeBySlugArgs = {
+export type UpdateIssueTypeBySlugArgs = GitHubRepoTarget & {
   owner: string
   repo: string
   number: number
@@ -421,12 +434,14 @@ export type UpdateIssueTypeBySlugArgs = {
   issueTypeId: string | null
 }
 
-export type ResolveProjectRefArgs = {
+export type ResolveProjectRefArgs = GitHubRepoTarget & {
   input: string
 }
 
-export type ListProjectViewsArgs = {
+export type ListProjectViewsArgs = GitHubRepoTarget & {
   owner: string
   ownerType: GitHubProjectOwnerType
   projectNumber: number
 }
+
+export type ListAccessibleProjectsArgs = GitHubRepoTarget