diff --git a/src/main/git/runner-gh-host-args.test.ts b/src/main/git/runner-gh-host-args.test.ts
index ef32a6f2b52..e4168dbaf9a 100644
--- a/src/main/git/runner-gh-host-args.test.ts
+++ b/src/main/git/runner-gh-host-args.test.ts
@@ -53,12 +53,22 @@ describe('applyGhHostToArgs', () => {
     ])
   })
 
-  it('qualifies the inline --repo= form for a GHES host', () => {
+  it('qualifies inline long and short repo forms for a GHES host', () => {
     expect(applyGhHostToArgs(['pr', 'list', '--repo=a/b'], 'github.acme-corp.com')).toEqual([
       'pr',
       'list',
       '--repo=github.acme-corp.com/a/b'
     ])
+    expect(applyGhHostToArgs(['pr', 'list', '-R=a/b'], 'github.acme-corp.com')).toEqual([
+      'pr',
+      'list',
+      '-R=github.acme-corp.com/a/b'
+    ])
+    expect(applyGhHostToArgs(['pr', 'list', '-Ra/b'], 'github.acme-corp.com')).toEqual([
+      'pr',
+      'list',
+      '-Rgithub.acme-corp.com/a/b'
+    ])
   })
 
   it('leaves --repo untouched for the github.com host (gh default resolution)', () => {
@@ -89,6 +99,15 @@ describe('applyGhHostToArgs', () => {
         'github.acme-corp.com'
       )
     ).toEqual(['pr', 'list', '--repo', 'github.acme-corp.com/a/b'])
+    expect(
+      applyGhHostToArgs(
+        ['pr', 'list', '-R=https://github.acme-corp.com/a/b'],
+        'github.acme-corp.com'
+      )
+    ).toEqual(['pr', 'list', '-R=https://github.acme-corp.com/a/b'])
+    expect(
+      applyGhHostToArgs(['pr', 'list', '-Rgithub.acme-corp.com/a/b'], 'github.acme-corp.com')
+    ).toEqual(['pr', 'list', '-Rgithub.acme-corp.com/a/b'])
   })
 
   it('injects --hostname and qualifies --repo together for GHES api calls', () => {
diff --git a/src/main/git/runner-gh-rate-limit-breaker.test.ts b/src/main/git/runner-gh-rate-limit-breaker.test.ts
index 6b2633bf15f..6d089971b3c 100644
--- a/src/main/git/runner-gh-rate-limit-breaker.test.ts
+++ b/src/main/git/runner-gh-rate-limit-breaker.test.ts
@@ -89,9 +89,18 @@ describe('ghExecFileAsync rate-limit breaker', () => {
         env: { ...process.env, GH_HOST: 'github.acme-corp.com' }
       })
     ).resolves.toMatchObject({ stdout: '[]' })
-    await expect(
-      ghExecFileAsync(['api', 'repos/a/b/pulls'], { wslDistro: 'Ubuntu' })
-    ).resolves.toMatchObject({ stdout: '[]' })
+    const originalPlatform = process.platform
+    Object.defineProperty(process, 'platform', { configurable: true, value: 'win32' })
+    try {
+      await expect(
+        ghExecFileAsync(['api', 'repos/a/b/pulls'], { wslDistro: 'Ubuntu' })
+      ).resolves.toMatchObject({ stdout: '[]' })
+    } finally {
+      Object.defineProperty(process, 'platform', {
+        configurable: true,
+        value: originalPlatform
+      })
+    }
     expect(execFileMock).toHaveBeenCalledTimes(5)
   })
 
diff --git a/src/main/git/runner-wsl-gh-fallback.test.ts b/src/main/git/runner-wsl-gh-fallback.test.ts
index c7710858838..26b58196cef 100644
--- a/src/main/git/runner-wsl-gh-fallback.test.ts
+++ b/src/main/git/runner-wsl-gh-fallback.test.ts
@@ -20,6 +20,10 @@ vi.mock('../wsl', async (importOriginal) => ({
 }))
 
 import { ghExecFileAsync, glabExecFileAsync } from './runner'
+import { _resetGhRateLimitBreaker } from './gh-rate-limit-breaker'
+
+const PRIMARY_RATE_LIMIT_STDERR =
+  'gh: API rate limit exceeded for user ID 1775218. Please wait. (HTTP 403)'
 
 describe('ghExecFileAsync WSL fallback', () => {
   const originalPlatform = process.platform
@@ -28,6 +32,7 @@ describe('ghExecFileAsync WSL fallback', () => {
     execFileMock.mockReset()
     getDefaultWslDistroMock.mockReset()
     getDefaultWslDistroMock.mockReturnValue(null)
+    _resetGhRateLimitBreaker()
     Object.defineProperty(process, 'platform', {
       configurable: true,
       value: 'win32'
@@ -35,6 +40,7 @@ describe('ghExecFileAsync WSL fallback', () => {
   })
 
   afterEach(() => {
+    _resetGhRateLimitBreaker()
     Object.defineProperty(process, 'platform', {
       configurable: true,
       value: originalPlatform
@@ -210,6 +216,43 @@ describe('ghExecFileAsync WSL fallback', () => {
     expect(execFileMock).toHaveBeenCalledTimes(2)
   })
 
+  it('retries a host-pinned idempotent gh GraphQL query after host injection', async () => {
+    execFileMock
+      .mockImplementationOnce((_binary, _args, _options, callback) => {
+        callback(
+          Object.assign(new Error('HTTP 502 Bad Gateway'), {
+            stdout: '',
+            stderr: 'HTTP 502 Bad Gateway'
+          })
+        )
+      })
+      .mockImplementationOnce((_binary, _args, _options, callback) => {
+        callback(null, { stdout: '{"data":{}}', stderr: '' })
+      })
+
+    await expect(
+      ghExecFileAsync(['api', 'graphql', '-f', 'query=query { viewer { login } }'], {
+        host: 'github.acme-corp.com'
+      })
+    ).resolves.toEqual({ stdout: '{"data":{}}', stderr: '' })
+
+    expect(execFileMock).toHaveBeenCalledTimes(2)
+    expect(execFileMock).toHaveBeenNthCalledWith(
+      1,
+      'gh',
+      [
+        'api',
+        '--hostname',
+        'github.acme-corp.com',
+        'graphql',
+        '-f',
+        'query=query { viewer { login } }'
+      ],
+      expect.any(Object),
+      expect.any(Function)
+    )
+  })
+
   it('does not retry non-idempotent gh API transient failures', async () => {
     execFileMock.mockImplementation((_binary, _args, _options, callback) => {
       callback(
@@ -290,6 +333,63 @@ describe('ghExecFileAsync WSL fallback', () => {
     )
   })
 
+  it('checks a blocked WSL scope before repeating a native-to-WSL fallback', async () => {
+    getDefaultWslDistroMock.mockReturnValue('Ubuntu')
+    execFileMock.mockImplementation((binary, _args, _options, callback) => {
+      if (binary === 'gh') {
+        callback(Object.assign(new Error('spawn gh ENOENT'), { code: 'ENOENT', stderr: '' }))
+        return
+      }
+      callback(
+        Object.assign(new Error(PRIMARY_RATE_LIMIT_STDERR), {
+          stdout: '',
+          stderr: PRIMARY_RATE_LIMIT_STDERR
+        })
+      )
+    })
+
+    await expect(ghExecFileAsync(['api', 'repos/acme/widgets/pulls'])).rejects.toThrow('rate limit')
+    await expect(ghExecFileAsync(['api', 'repos/acme/widgets/pulls'])).rejects.toMatchObject({
+      ghRateLimitBlocked: true
+    })
+
+    expect(execFileMock).toHaveBeenCalledTimes(3)
+    expect(execFileMock.mock.calls.map(([binary]) => binary)).toEqual(['gh', 'wsl.exe', 'gh'])
+  })
+
+  it('checks a blocked native scope before repeating a WSL-to-native fallback', async () => {
+    execFileMock.mockImplementation((binary, _args, _options, callback) => {
+      if (binary === 'wsl.exe') {
+        callback(
+          Object.assign(new Error('Command failed: wsl.exe'), {
+            stdout: '',
+            stderr: 'bash: line 1: gh: command not found\n'
+          })
+        )
+        return
+      }
+      callback(
+        Object.assign(new Error(PRIMARY_RATE_LIMIT_STDERR), {
+          stdout: '',
+          stderr: PRIMARY_RATE_LIMIT_STDERR
+        })
+      )
+    })
+
+    const options = {
+      cwd: String.raw`\\wsl.localhost\Ubuntu\home\jinwoo\stably\noqa`
+    }
+    await expect(ghExecFileAsync(['api', 'repos/acme/widgets/pulls'], options)).rejects.toThrow(
+      'rate limit'
+    )
+    await expect(
+      ghExecFileAsync(['api', 'repos/acme/widgets/pulls'], options)
+    ).rejects.toMatchObject({ ghRateLimitBlocked: true })
+
+    expect(execFileMock).toHaveBeenCalledTimes(3)
+    expect(execFileMock.mock.calls.map(([binary]) => binary)).toEqual(['wsl.exe', 'gh', 'wsl.exe'])
+  })
+
   it('does not retry non-idempotent glab transient failures', async () => {
     execFileMock.mockImplementation((_binary, _args, _options, callback) => {
       callback(
diff --git a/src/main/git/runner.ts b/src/main/git/runner.ts
index 98b9c0afdc6..65ff7501b3a 100644
--- a/src/main/git/runner.ts
+++ b/src/main/git/runner.ts
@@ -26,7 +26,8 @@ import {
   getGhRateLimitBlockedUntilMs,
   isGhPrimaryRateLimitStderr,
   isGhRateLimitProbe,
-  notifyGhPrimaryRateLimit
+  notifyGhPrimaryRateLimit,
+  type GhRateLimitBucket
 } from './gh-rate-limit-breaker'
 import { getDefaultWslDistro, parseWslPath, toWindowsWslPath, type WslPathInfo } from '../wsl'
 import { addWslEnvKeys } from '../wsl-env'
@@ -1446,17 +1447,41 @@ export function applyGhHostToArgs(args: string[], host?: string): string[] {
     if (arg.startsWith('--repo=')) {
       return `--repo=${hostQualifiedGhRepoValue(arg.slice('--repo='.length), host)}`
     }
+    if (arg.startsWith('-R=')) {
+      return `-R=${hostQualifiedGhRepoValue(arg.slice('-R='.length), host)}`
+    }
+    if (arg.startsWith('-R') && arg.length > '-R'.length) {
+      return `-R${hostQualifiedGhRepoValue(arg.slice('-R'.length), host)}`
+    }
     return arg
   })
 }
 
 function ghRateLimitScope(options: GhExecOptions, resolved: ResolvedCommand): string {
-  const distro = resolved.wsl?.distro ?? options.wslDistro
-  const runtime = distro ? `wsl:${distro.toLowerCase()}` : 'native'
+  const runtime = resolved.wsl ? `wsl:${resolved.wsl.distro.toLowerCase()}` : 'native'
   const host = options.host ?? options.env?.GH_HOST ?? process.env.GH_HOST ?? 'github.com'
   return `${runtime}:${host.toLowerCase()}`
 }
 
+function assertGhRateLimitScopeAvailable(
+  options: GhExecOptions,
+  resolved: ResolvedCommand,
+  bucket: GhRateLimitBucket,
+  exemptProbe: boolean
+): void {
+  if (exemptProbe) {
+    return
+  }
+  const blockedUntilMs = getGhRateLimitBlockedUntilMs(
+    bucket,
+    Date.now(),
+    ghRateLimitScope(options, resolved)
+  )
+  if (blockedUntilMs !== null) {
+    throw createGhRateLimitBlockedError(bucket, blockedUntilMs)
+  }
+}
+
 /**
  * Async gh CLI execution. Drop-in replacement for
  * `execFileAsync('gh', args, { cwd, encoding, ... })`.
@@ -1469,6 +1494,7 @@ export async function ghExecFileAsync(
   args: string[],
   options: GhExecOptions = {}
 ): Promise<{ stdout: string; stderr: string }> {
+  const idempotent = options.idempotent ?? argsLookIdempotent(args)
   args = applyGhHostToArgs(args, options.host)
   let resolved = resolveCommand('gh', args, options.cwd, options.wslDistro)
   // Why: while a bucket's primary rate limit is exhausted, every spawn would
@@ -1477,17 +1503,8 @@ export async function ghExecFileAsync(
   // Scope by execution runtime and host so github.com, GHES, and WSL accounts
   // cannot block one another after an unrelated quota exhaustion.
   const rateLimitBucket = classifyGhRateLimitBucket(args)
-  const initialRateLimitScope = ghRateLimitScope(options, resolved)
-  if (!isGhRateLimitProbe(args)) {
-    const blockedUntilMs = getGhRateLimitBlockedUntilMs(
-      rateLimitBucket,
-      Date.now(),
-      initialRateLimitScope
-    )
-    if (blockedUntilMs !== null) {
-      throw createGhRateLimitBlockedError(rateLimitBucket, blockedUntilMs)
-    }
-  }
+  const rateLimitProbe = isGhRateLimitProbe(args)
+  assertGhRateLimitScopeAvailable(options, resolved, rateLimitBucket, rateLimitProbe)
   let lastError: unknown
   let attemptedHostFallback = false
   let attemptedDefaultWslFallback = false
@@ -1523,6 +1540,7 @@ export async function ghExecFileAsync(
           // global calls like rate_limit/auth do not carry a repo cwd to route by.
           resolved = wslResolved
           attemptedDefaultWslFallback = true
+          assertGhRateLimitScopeAvailable(options, resolved, rateLimitBucket, rateLimitProbe)
           attempt = -1
           continue
         }
@@ -1530,6 +1548,7 @@ export async function ghExecFileAsync(
       if (!attemptedHostFallback && canFallBackToHostGitHubCli('gh', args, resolved, stderr)) {
         resolved = resolveHostGitHubCli('gh', args)
         attemptedHostFallback = true
+        assertGhRateLimitScopeAvailable(options, resolved, rateLimitBucket, rateLimitProbe)
         attempt = -1
         continue
       }
@@ -1540,7 +1559,6 @@ export async function ghExecFileAsync(
       // a label). When the caller doesn't say, we auto-detect from argv —
       // explicit `-X <method>` and GraphQL `query=mutation …` are treated
       // as non-idempotent. See bug-scan finding 1.
-      const idempotent = options.idempotent ?? argsLookIdempotent(args)
       if (idempotent && !isLastAttempt && isTransientGhError(stderr)) {
         // Why: when the upstream surfaced a Retry-After (e.g. on a transient
         // 5xx that GitHub explicitly recommends backing off for), honor it
diff --git a/src/main/github/client-file-viewed.test.ts b/src/main/github/client-file-viewed.test.ts
index d30779d3a78..79ad4e6a752 100644
--- a/src/main/github/client-file-viewed.test.ts
+++ b/src/main/github/client-file-viewed.test.ts
@@ -75,7 +75,10 @@ describe('setPRFileViewed', () => {
     expect(args.find((arg: string) => arg.startsWith('query='))).toContain('markFileAsViewed')
     expect(args).toContain('pullRequestId=PR_kwDO123')
     expect(args).toContain('path=src/app.ts')
-    expect(ghExecFileAsyncMock.mock.calls[0][1]).toEqual({ cwd: '/repo-root' })
+    expect(ghExecFileAsyncMock.mock.calls[0][1]).toEqual({
+      cwd: '/repo-root',
+      host: 'github.com'
+    })
     expect(releaseMock).toHaveBeenCalledTimes(1)
   })
 
@@ -111,6 +114,7 @@ describe('setPRFileViewed', () => {
 
     expect(ghExecFileAsyncMock.mock.calls[0][1]).toEqual({
       cwd: '/repo-root',
+      host: 'github.com',
       wslDistro: 'Ubuntu'
     })
   })
diff --git a/src/main/github/client-pr-check-details.test.ts b/src/main/github/client-pr-check-details.test.ts
index 952006667f3..ff210f7bc7e 100644
--- a/src/main/github/client-pr-check-details.test.ts
+++ b/src/main/github/client-pr-check-details.test.ts
@@ -132,17 +132,17 @@ describe('getPRCheckDetails', () => {
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       1,
       ['api', 'repos/acme/widgets/check-runs/88'],
-      { cwd: '/repo-root' }
+      { cwd: '/repo-root', host: 'github.com' }
     )
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       2,
       ['api', 'repos/acme/widgets/check-runs/88/annotations?per_page=20'],
-      { cwd: '/repo-root' }
+      { cwd: '/repo-root', host: 'github.com' }
     )
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       3,
       ['api', 'repos/acme/widgets/actions/runs/77/jobs?per_page=100'],
-      { cwd: '/repo-root' }
+      { cwd: '/repo-root', host: 'github.com' }
     )
   })
 
@@ -209,7 +209,7 @@ describe('getPRCheckDetails', () => {
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       4,
       ['api', 'repos/acme/widgets/actions/jobs/8801/logs'],
-      { cwd: '/repo-root' }
+      { cwd: '/repo-root', host: 'github.com' }
     )
     expect(ghExecFileAsyncMock).toHaveBeenCalledTimes(4)
   })
diff --git a/src/main/github/client-pr-checks.test.ts b/src/main/github/client-pr-checks.test.ts
index 2c7c509f4eb..82310af697b 100644
--- a/src/main/github/client-pr-checks.test.ts
+++ b/src/main/github/client-pr-checks.test.ts
@@ -422,12 +422,12 @@ describe('getPRChecks', () => {
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       2,
       ['api', '--cache', '60s', 'repos/acme/widgets/commits/head-oid/check-runs?per_page=100'],
-      { cwd: '/repo-root' }
+      { cwd: '/repo-root', host: 'github.com' }
     )
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       3,
       ['api', '--cache', '60s', 'repos/acme/widgets/commits/head-oid/status?per_page=100'],
-      { cwd: '/repo-root' }
+      { cwd: '/repo-root', host: 'github.com' }
     )
     expect(checks).toEqual([
       {
@@ -505,7 +505,7 @@ describe('getPRChecks', () => {
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       3,
       ['pr', 'checks', '42', '--json', 'name,state,link', '--repo', 'acme/widgets'],
-      { cwd: '/repo-root' }
+      { cwd: '/repo-root', host: 'github.com' }
     )
     expect(checks).toEqual([
       {
@@ -542,7 +542,11 @@ describe('getPRChecks', () => {
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       2,
       ['api', '-X', 'POST', 'repos/acme/widgets/actions/runs/77/rerun-failed-jobs'],
-      { cwd: '/repo-root', env: { ...process.env, GH_PROMPT_DISABLED: '1' } }
+      {
+        cwd: '/repo-root',
+        env: { ...process.env, GH_PROMPT_DISABLED: '1' },
+        host: 'github.com'
+      }
     )
   })
 
@@ -611,7 +615,7 @@ describe('getPRChecks', () => {
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       2,
       ['pr', 'checks', '42', '--json', 'name,state,link', '--repo', 'acme/widgets'],
-      { cwd: '/repo-root' }
+      { cwd: '/repo-root', host: 'github.com' }
     )
   })
 
diff --git a/src/main/github/client.test.ts b/src/main/github/client.test.ts
index adb34ca6bcc..2a3c102f0c0 100644
--- a/src/main/github/client.test.ts
+++ b/src/main/github/client.test.ts
@@ -3637,7 +3637,7 @@ describe('updatePRState', () => {
 
     expect(ghExecFileAsyncMock).toHaveBeenCalledWith(
       ['pr', 'reopen', '3977', '--repo', 'stablyai/orca'],
-      { cwd: '/repo-root' }
+      { cwd: '/repo-root', host: 'github.com' }
     )
     expect(acquireMock).toHaveBeenCalledTimes(1)
     expect(releaseMock).toHaveBeenCalledTimes(1)
@@ -3653,7 +3653,7 @@ describe('updatePRState', () => {
 
     expect(ghExecFileAsyncMock).toHaveBeenCalledWith(
       ['pr', 'close', '3977', '--repo', 'stablyai/orca'],
-      { cwd: '/repo-root' }
+      { cwd: '/repo-root', host: 'github.com' }
     )
   })
 
@@ -3669,7 +3669,7 @@ describe('updatePRState', () => {
 
     expect(ghExecFileAsyncMock).toHaveBeenCalledWith(
       ['pr', 'reopen', '3977', '--repo', 'stablyai/orca'],
-      {}
+      { host: 'github.com' }
     )
   })
 })
@@ -3758,12 +3758,12 @@ describe('GitHub GraphQL rate-limit guard', () => {
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       1,
       ['api', '--cache', '60s', 'repos/stablyai/orca/issues/7/comments?per_page=100'],
-      { cwd: '/repo-root' }
+      { cwd: '/repo-root', host: 'github.com' }
     )
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       2,
       ['api', '--cache', '60s', 'repos/stablyai/orca/pulls/7/reviews?per_page=100'],
-      { cwd: '/repo-root' }
+      { cwd: '/repo-root', host: 'github.com' }
     )
   })
 
@@ -3813,20 +3813,21 @@ describe('GitHub GraphQL rate-limit guard', () => {
         '--json',
         'number,title,state,url,statusCheckRollup,updatedAt,isDraft,mergeable,reviewDecision,mergeStateStatus,autoMergeRequest,baseRefName,headRefName,baseRefOid,headRefOid'
       ],
-      { cwd: '/repo-root' }
+      { cwd: '/repo-root', host: 'github.com' }
     )
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       2,
       ['pr', 'merge', '7', '--squash', '--repo', 'stablyai/orca'],
       expect.objectContaining({
         cwd: '/repo-root',
-        env: expect.objectContaining({ GH_PROMPT_DISABLED: '1' })
+        env: expect.objectContaining({ GH_PROMPT_DISABLED: '1' }),
+        host: 'github.com'
       })
     )
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       3,
       ['pr', 'edit', '7', '--title', 'New title', '--repo', 'stablyai/orca'],
-      { cwd: '/repo-root' }
+      { cwd: '/repo-root', host: 'github.com' }
     )
   })
 
@@ -3855,7 +3856,7 @@ describe('GitHub GraphQL rate-limit guard', () => {
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       1,
       ['pr', 'view', '7', '--json', 'id,headRefOid,baseRefName', '--repo', 'stablyai/orca'],
-      {}
+      { host: 'github.com' }
     )
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       2,
@@ -3870,14 +3871,16 @@ describe('GitHub GraphQL rate-limit guard', () => {
         'expectedHeadOid=head-oid'
       ]),
       expect.objectContaining({
-        env: expect.objectContaining({ GH_PROMPT_DISABLED: '1' })
+        env: expect.objectContaining({ GH_PROMPT_DISABLED: '1' }),
+        host: 'github.com'
       })
     )
     expect(ghExecFileAsyncMock).toHaveBeenNthCalledWith(
       3,
       ['pr', 'merge', '7', '--disable-auto', '--repo', 'stablyai/orca'],
       expect.objectContaining({
-        env: expect.objectContaining({ GH_PROMPT_DISABLED: '1' })
+        env: expect.objectContaining({ GH_PROMPT_DISABLED: '1' }),
+        host: 'github.com'
       })
     )
     expect(ghExecFileAsyncMock.mock.calls[0]?.[1]).not.toHaveProperty('cwd')
diff --git a/src/main/github/github-api-repository.test.ts b/src/main/github/github-api-repository.test.ts
new file mode 100644
index 00000000000..b63ee1530e6
--- /dev/null
+++ b/src/main/github/github-api-repository.test.ts
@@ -0,0 +1,19 @@
+import { describe, expect, it } from 'vitest'
+
+import { githubHostExecOptions } from './github-api-repository'
+
+describe('githubHostExecOptions', () => {
+  it('pins every known repository host', () => {
+    expect(githubHostExecOptions({ owner: 'acme', repo: 'widgets', host: 'github.com' })).toEqual({
+      host: 'github.com'
+    })
+    expect(
+      githubHostExecOptions({ owner: 'acme', repo: 'widgets', host: 'github.acme-corp.com' })
+    ).toEqual({ host: 'github.acme-corp.com' })
+  })
+
+  it('does not invent a host when repository identity is unavailable or legacy', () => {
+    expect(githubHostExecOptions({ owner: 'acme', repo: 'widgets' })).toEqual({})
+    expect(githubHostExecOptions(null)).toEqual({})
+  })
+})
diff --git a/src/main/github/github-api-repository.ts b/src/main/github/github-api-repository.ts
index 0484f1d03a5..cd7284dd90e 100644
--- a/src/main/github/github-api-repository.ts
+++ b/src/main/github/github-api-repository.ts
@@ -49,14 +49,13 @@ export function isGitHubDotComRepository(repository: GitHubApiRepository): boole
   return !repository.host || repository.host.toLowerCase() === 'github.com'
 }
 
-// Why: the gh runner host-qualifies argv (`--hostname`, `HOST/OWNER/REPO`)
-// from `options.host`, so merging this into a call's exec options is the one
-// step a call site needs to target GHES. github.com stays unset to keep gh's
-// default-host resolution (and existing argv) unchanged.
+// Why: the gh runner host-qualifies argv from `options.host`, so every known
+// host must be carried through. Pinning github.com prevents a process-level
+// GH_HOST from silently redirecting an otherwise unambiguous API request.
 export function githubHostExecOptions(repository: GitHubApiRepository | null | undefined): {
   host?: string
 } {
-  return repository?.host && !isGitHubDotComRepository(repository) ? { host: repository.host } : {}
+  return repository?.host ? { host: repository.host } : {}
 }
 
 export function githubRepositoryWebHost(repository: GitHubApiRepository): string {