diff --git a/mobile/src/tasks/github-project-host-routing-source.test.ts b/mobile/src/tasks/github-project-host-routing-source.test.ts
index 3c567a819ad..693f741714e 100644
--- a/mobile/src/tasks/github-project-host-routing-source.test.ts
+++ b/mobile/src/tasks/github-project-host-routing-source.test.ts
@@ -108,14 +108,14 @@ describe('mobile GitHub Project host routing boundary', () => {
     )
     // Per method, not once per file: dropping prRepo from a single mutation must fail here.
     for (const method of [
-      'fetchResolveReviewThread',
-      'fetchAddPRReviewCommentReply',
-      'fetchAddIssueComment',
-      'fetchRequestPRReviewers',
-      'fetchRerunPRChecks',
-      'fetchMergePR'
+      'github.resolveReviewThread',
+      'github.addPRReviewCommentReply',
+      'github.addIssueComment',
+      'github.requestPRReviewers',
+      'github.rerunPRChecks',
+      'github.mergePR'
     ]) {
-      const offset = projectMutationAdapter.indexOf(`${method}(`)
+      const offset = projectMutationAdapter.indexOf(`'${method}'`)
       expect(offset, `${method} must remain wired`).toBeGreaterThan(-1)
       // Bounded to this adapter method, so a neighbour's prRepo cannot satisfy it.
       expect(
diff --git a/mobile/src/tasks/native-host-task-detail-operations.test.ts b/mobile/src/tasks/native-host-task-detail-operations.test.ts
new file mode 100644
index 00000000000..5ac77ea2991
--- /dev/null
+++ b/mobile/src/tasks/native-host-task-detail-operations.test.ts
@@ -0,0 +1,27 @@
+import { expect, it, vi } from 'vitest'
+import type { RpcRequestSender } from '../transport/rpc-client'
+import { nativeHostTaskDetailOperations } from './native-host-task-detail-operations'
+
+it('waits for raw Linear requests so a comments transport rejection wins over an issue refusal', async () => {
+  let rejectComments!: (error: Error) => void
+  const comments = new Promise<never>((_resolve, reject) => {
+    rejectComments = reject
+  })
+  const sendRequest = vi.fn<RpcRequestSender['sendRequest']>((method) =>
+    method === 'linear.getIssue'
+      ? Promise.resolve({
+          id: 'test',
+          _meta: { runtimeId: 'host' },
+          ok: false,
+          error: { code: 'refused', message: 'issue refused' }
+        })
+      : comments
+  )
+  const outcome = nativeHostTaskDetailOperations({ sendRequest })
+    .loadLinear({ issueId: 'issue-1', workspaceId: 'workspace-1' })
+    .catch((error: unknown) => error)
+  await new Promise<void>((resolve) => setTimeout(resolve, 0))
+  const commentsError = new Error('comments transport failed')
+  rejectComments(commentsError)
+  await expect(outcome).resolves.toBe(commentsError)
+})
diff --git a/mobile/src/tasks/native-host-task-detail-operations.ts b/mobile/src/tasks/native-host-task-detail-operations.ts
index 40132a85c13..01cce9f7527 100644
--- a/mobile/src/tasks/native-host-task-detail-operations.ts
+++ b/mobile/src/tasks/native-host-task-detail-operations.ts
@@ -81,8 +81,13 @@ export function nativeHostTaskDetailOperations(client: RpcRequestSender): HostTa
           { timeoutMs: 30_000 }
         )
       ])
-      const issue = await successfulResult<LinearIssue | null>(issueResponse)
-      const comments = await optionalComments(commentsResponse)
+      if (!issueResponse.ok) {
+        throw new Error(issueResponse.error.message)
+      }
+      const issue = issueResponse.result as LinearIssue | null
+      const comments = commentsResponse.ok
+        ? ((commentsResponse.result as DetailComment[]) ?? [])
+        : []
       if (!issue) {
         throw new Error('Details not found')
       }
@@ -91,13 +96,6 @@ export function nativeHostTaskDetailOperations(client: RpcRequestSender): HostTa
   }
 }
 
-/** Tolerates a refusal envelope only. A transport rejection still fails the detail load, so a
- *  timed-out comment read cannot render as an issue that simply has no comments. */
-async function optionalComments(request: Promise<unknown>): Promise<DetailComment[]> {
-  const response = (await request) as { ok: boolean; result?: unknown }
-  return response.ok ? ((response.result as DetailComment[]) ?? []) : []
-}
-
 async function successfulResult<T>(request: Promise<unknown>): Promise<T> {
   const response = (await request) as {
     ok: boolean
diff --git a/mobile/src/tasks/native-host-task-project-mutation-operations.test.ts b/mobile/src/tasks/native-host-task-project-mutation-operations.test.ts
new file mode 100644
index 00000000000..e1898d7142a
--- /dev/null
+++ b/mobile/src/tasks/native-host-task-project-mutation-operations.test.ts
@@ -0,0 +1,113 @@
+import { describe, expect, it, vi } from 'vitest'
+import type { RpcRequestSender } from '../transport/rpc-client'
+import type { HostTaskProjectMutationOperations } from './host-task-project-mutation-operations'
+import { nativeHostTaskProjectMutationOperations } from './native-host-task-project-mutation-operations'
+
+const target = { owner: 'orca', repo: 'orca', host: 'github.com', number: 7, type: 'pr' as const }
+const mutations: Array<
+  [string, (ops: HostTaskProjectMutationOperations) => Promise<unknown>, string]
+> = [
+  [
+    'updateItem',
+    (ops) => ops.updateItem(target, { title: 'title' }),
+    'Failed to update GitHub item'
+  ],
+  [
+    'updateIssue',
+    (ops) => ops.updateItem({ ...target, type: 'issue' }, {}),
+    'Failed to update GitHub item'
+  ],
+  ['updateComment', (ops) => ops.updateComment(target, 1, 'body'), 'Failed to edit comment'],
+  ['deleteComment', (ops) => ops.deleteComment(target, 1), 'Failed to delete comment'],
+  ['updateMetadata', (ops) => ops.updateMetadata(target, {}), 'Failed to update GitHub item'],
+  [
+    'updateField',
+    (ops) =>
+      ops.updateField({ ...target, projectId: 'p', itemId: 'i' }, 'f', {
+        kind: 'text',
+        text: 'value'
+      }),
+    'Failed to update project field'
+  ],
+  [
+    'clearField',
+    (ops) => ops.updateField({ ...target, projectId: 'p', itemId: 'i' }, 'f', null),
+    'Failed to update project field'
+  ],
+  ['updateIssueType', (ops) => ops.updateIssueType(target, null), 'Failed to update issue type'],
+  [
+    'replyReviewComment',
+    (ops) => ops.replyReviewComment(target, 'repo-1', { commentId: 1, body: 'body' }),
+    'Failed to reply'
+  ],
+  [
+    'addConversationComment',
+    (ops) => ops.addConversationComment(target, 'repo-1', 'body'),
+    'Failed to reply'
+  ],
+  [
+    'requestReviewers',
+    (ops) => ops.requestReviewers(target, 'repo-1', ['reviewer']),
+    'Failed to request reviewers'
+  ],
+  [
+    'rerunChecks',
+    (ops) => ops.rerunChecks(target, 'repo-1', { failedOnly: true }),
+    'Failed to rerun checks'
+  ],
+  ['merge', (ops) => ops.merge(target, 'repo-1', 'squash'), 'Failed to merge pull request']
+]
+
+function operations(result: unknown) {
+  const sendRequest = vi
+    .fn<RpcRequestSender['sendRequest']>()
+    .mockResolvedValue({ id: 'test', _meta: { runtimeId: 'host' }, ok: true, result })
+  return nativeHostTaskProjectMutationOperations({ sendRequest })
+}
+
+describe('Project mutation result acceptance', () => {
+  it.each(mutations)(
+    '%s rejects absent results, accepts missing ok, and reports refusal',
+    async (_name, mutate, fallback) => {
+      for (const result of [null, undefined]) {
+        await expect(mutate(operations(result))).rejects.toBeInstanceOf(TypeError)
+      }
+      for (const result of [{}, { ok: undefined }, { ok: true }]) {
+        await expect(mutate(operations(result))).resolves.toBeUndefined()
+      }
+      await expect(mutate(operations({ ok: false }))).rejects.toThrow(fallback)
+    }
+  )
+
+  it('addComment requires truthy ok and preserves the host message', async () => {
+    for (const result of [null, undefined]) {
+      await expect(operations(result).addComment(target, 'body')).rejects.toBeInstanceOf(TypeError)
+    }
+    for (const result of [{}, { ok: undefined }, { ok: false }]) {
+      await expect(operations(result).addComment(target, 'body')).rejects.toThrow(
+        'Failed to add comment'
+      )
+    }
+    await expect(
+      operations({ ok: false, error: { message: 'host refusal' } }).addComment(target, 'body')
+    ).rejects.toThrow('host refusal')
+    await expect(operations({ ok: true }).addComment(target, 'body')).resolves.toBeUndefined()
+  })
+
+  it('merge preserves its string refusal', async () => {
+    await expect(
+      operations({ ok: false, error: 'merge refusal' }).merge(target, 'repo-1', 'merge')
+    ).rejects.toThrow('merge refusal')
+  })
+
+  it('resolveReviewThread requires the literal true result', async () => {
+    for (const result of [null, undefined, {}, { ok: true }, false]) {
+      await expect(
+        operations(result).resolveReviewThread(target, 'repo-1', 'thread', true)
+      ).rejects.toThrow('Failed to resolve thread')
+    }
+    await expect(
+      operations(true).resolveReviewThread(target, 'repo-1', 'thread', true)
+    ).resolves.toBeUndefined()
+  })
+})
diff --git a/mobile/src/tasks/native-host-task-project-mutation-operations.ts b/mobile/src/tasks/native-host-task-project-mutation-operations.ts
index 875bb30a6f8..f983405291e 100644
--- a/mobile/src/tasks/native-host-task-project-mutation-operations.ts
+++ b/mobile/src/tasks/native-host-task-project-mutation-operations.ts
@@ -4,15 +4,6 @@ import type {
   HostTaskProjectMutationOperations
 } from './host-task-project-mutation-operations'
 import type { RpcRequestSender } from '../transport/rpc-client'
-import {
-  fetchAddIssueComment,
-  fetchAddPRReviewCommentReply,
-  fetchMergePR,
-  fetchRequestPRReviewers,
-  fetchRerunPRChecks,
-  fetchResolveReviewThread,
-  type GitHubPrMutationOutcome
-} from '../session/github-pr-mutations'
 
 const PROJECT_PR_MUTATION_TIMEOUT_MS = 60_000
 /** Every project mutation carried a connect deadline before this seam existed. Without one the
@@ -87,89 +78,84 @@ export function nativeHostTaskProjectMutationOperations(
       })
     },
     async resolveReviewThread(target, repoId, threadId, resolve) {
-      requirePrMutation(
-        await fetchResolveReviewThread(
-          client,
-          repoId,
-          {
-            threadId,
-            resolve,
-            // Why: a draft row
-            // has no slug — send it only when one resolved rather than an empty pair.
-            prRepo: prRepoPayload(target)
-          },
-          { timeoutMs: PROJECT_MUTATION_TIMEOUT_MS }
-        ),
-        resolve ? 'Failed to resolve thread' : 'Failed to reopen thread'
+      const response = await client.sendRequest(
+        'github.resolveReviewThread',
+        {
+          repo: `id:${repoId}`,
+          prRepo: prRepoPayload(target),
+          threadId,
+          resolve
+        },
+        { timeoutMs: PROJECT_MUTATION_TIMEOUT_MS }
       )
+      if (!response.ok) {
+        throw new Error(response.error.message)
+      }
+      if (response.result !== true) {
+        throw new Error(resolve ? 'Failed to resolve thread' : 'Failed to reopen thread')
+      }
     },
     async replyReviewComment(target, repoId, payload) {
-      return prMutationComment(
-        await fetchAddPRReviewCommentReply(
-          client,
-          repoId,
-          {
-            prNumber: target.number,
-            ...payload,
-            prRepo: prRepoPayload(target)
-          },
-          { timeoutMs: PROJECT_MUTATION_TIMEOUT_MS }
-        ),
-        'Failed to reply'
+      const result = await projectMutation<{ comment?: DetailComment }>(
+        client,
+        'github.addPRReviewCommentReply',
+        {
+          repo: `id:${repoId}`,
+          prNumber: target.number,
+          prRepo: prRepoPayload(target),
+          ...payload
+        }
       )
+      return result.comment
     },
     async addConversationComment(target, repoId, body) {
-      return prMutationComment(
-        await fetchAddIssueComment(
-          client,
-          repoId,
-          {
-            prNumber: target.number,
-            body,
-            prRepo: prRepoPayload(target),
-            type: target.type
-          },
-          { timeoutMs: PROJECT_MUTATION_TIMEOUT_MS }
-        ),
-        'Failed to reply'
+      const result = await projectMutation<{ comment?: DetailComment }>(
+        client,
+        'github.addIssueComment',
+        {
+          repo: `id:${repoId}`,
+          number: target.number,
+          prRepo: prRepoPayload(target),
+          body,
+          type: target.type
+        }
       )
+      return result.comment
     },
     async requestReviewers(target, repoId, reviewers) {
-      requirePrMutation(
-        await fetchRequestPRReviewers(
-          client,
-          repoId,
-          {
-            prNumber: target.number,
-            reviewers,
-            prRepo: prRepoPayload(target)
-          },
-          { timeoutMs: PROJECT_MUTATION_TIMEOUT_MS }
-        ),
-        'Failed to request reviewers'
-      )
+      await projectMutation(client, 'github.requestPRReviewers', {
+        repo: `id:${repoId}`,
+        prNumber: target.number,
+        prRepo: prRepoPayload(target),
+        reviewers
+      })
     },
     async rerunChecks(target, repoId, payload) {
-      requirePrMutation(
-        await fetchRerunPRChecks(
-          client,
-          repoId,
-          { prNumber: target.number, ...payload, prRepo: prRepoPayload(target) },
-          // A CI rerun and a merge both routinely outrun the 30s default.
-          { timeoutMs: PROJECT_PR_MUTATION_TIMEOUT_MS }
-        ),
-        'Failed to rerun checks'
+      await projectMutation(
+        client,
+        'github.rerunPRChecks',
+        {
+          repo: `id:${repoId}`,
+          prNumber: target.number,
+          prRepo: prRepoPayload(target),
+          ...payload
+        },
+        false,
+        PROJECT_PR_MUTATION_TIMEOUT_MS
       )
     },
     async merge(target, repoId, method) {
-      requirePrMutation(
-        await fetchMergePR(
-          client,
-          repoId,
-          { prNumber: target.number, method, prRepo: prRepoPayload(target) },
-          { timeoutMs: PROJECT_PR_MUTATION_TIMEOUT_MS }
-        ),
-        'Failed to merge pull request'
+      await projectMutation(
+        client,
+        'github.mergePR',
+        {
+          repo: `id:${repoId}`,
+          prNumber: target.number,
+          prRepo: prRepoPayload(target),
+          method
+        },
+        false,
+        PROJECT_PR_MUTATION_TIMEOUT_MS
       )
     }
   }
@@ -202,49 +188,40 @@ const PROJECT_MUTATION_FALLBACKS: Record<string, string> = {
   'github.project.deleteIssueCommentBySlug': 'Failed to delete comment',
   'github.project.updateItemField': 'Failed to update project field',
   'github.project.clearItemField': 'Failed to update project field',
-  'github.project.updateIssueTypeBySlug': 'Failed to update issue type'
+  'github.project.updateIssueTypeBySlug': 'Failed to update issue type',
+  'github.addPRReviewCommentReply': 'Failed to reply',
+  'github.addIssueComment': 'Failed to reply',
+  'github.requestPRReviewers': 'Failed to request reviewers',
+  'github.rerunPRChecks': 'Failed to rerun checks',
+  'github.mergePR': 'Failed to merge pull request'
 }
 
 async function projectMutation<T extends object = object>(
   client: RpcRequestSender,
   method: string,
   payload: object,
-  requireOk = false
+  requireOk = false,
+  timeoutMs = PROJECT_MUTATION_TIMEOUT_MS
 ): Promise<T> {
   const fallback = PROJECT_MUTATION_FALLBACKS[method] ?? 'GitHub Project request failed'
-  const response = (await client.sendRequest(method, payload, { timeoutMs: 30_000 })) as {
-    ok: boolean
-    result?: { ok?: boolean; error?: string | { message?: string } }
-    error?: { message?: string }
-  }
+  const response = await client.sendRequest(method, payload, { timeoutMs })
   if (!response.ok) {
-    throw new Error(response.error?.message ?? fallback)
+    throw new Error(response.error.message)
   }
-  if (requireOk && !response.result?.ok) {
-    throw new Error(fallback)
+  const result = response.result as { ok?: boolean; error?: string | { message?: string } }
+  if (requireOk ? !result.ok : result.ok === false) {
+    const error = result.error
+    if (!method.startsWith('github.project.')) {
+      throw new Error((error as string | undefined) ?? fallback)
+    }
+    const acceptsString =
+      method === 'github.project.updateIssueCommentBySlug' ||
+      method === 'github.project.deleteIssueCommentBySlug'
+    throw new Error(
+      acceptsString && typeof error === 'string'
+        ? error
+        : ((typeof error === 'object' ? error?.message : undefined) ?? fallback)
+    )
   }
-  if (response.result?.ok === false) {
-    const error = response.result.error
-    throw new Error(typeof error === 'string' ? error : (error?.message ?? fallback))
-  }
-  return (response.result ?? {}) as T
-}
-
-/** The wrapper substitutes its own copy for two cases the caller used to word itself: a host
- *  that says nothing (`Request failed: <method>`) and a review thread it could not update. */
-const WRAPPER_SUBSTITUTED_COPY = ['Request failed: ', 'Failed to update review thread.']
-
-function requirePrMutation(result: GitHubPrMutationOutcome, fallback: string): void {
-  if (!result.ok) {
-    const substituted = WRAPPER_SUBSTITUTED_COPY.some((copy) => result.error.startsWith(copy))
-    throw new Error(substituted ? fallback : result.error)
-  }
-}
-
-function prMutationComment(
-  result: GitHubPrMutationOutcome,
-  fallback: string
-): DetailComment | undefined {
-  requirePrMutation(result, fallback)
-  return (result as { comment?: DetailComment }).comment
+  return result as T
 }