diff --git a/mobile/src/session/github-pr-mutations.ts b/mobile/src/session/github-pr-mutations.ts
index 48329bfe619..e7327fc76b5 100644
--- a/mobile/src/session/github-pr-mutations.ts
+++ b/mobile/src/session/github-pr-mutations.ts
@@ -1,5 +1,5 @@
 import type { GitHubPRMergeMethod } from '../../../src/shared/github/pull-request-types'
-import type { RpcClient } from '../transport/rpc-client'
+import type { RpcRequestSender } from '../transport/rpc-client'
 import { buildGithubPrParams, githubPrRepoSlugParam, type GitHubPrRepoSlug } from './github-pr-rpc'
 
 // Mutation wrappers for the github.* PR surface, split out so github-pr-rpc.ts
@@ -17,7 +17,7 @@ export type GitHubPrMutationOutcome = { ok: true; comment?: unknown } | { ok: fa
 type RawResult = { ok: true; result: unknown } | { ok: false; error: string }
 
 async function sendRaw(
-  client: Pick<RpcClient, 'sendRequest'>,
+  client: RpcRequestSender,
   method: string,
   params: Record<string, unknown>
 ): Promise<RawResult> {
@@ -52,7 +52,7 @@ function extractMutationError(error: unknown, method: string): string {
 // `response.ok === false` (timeout/connection) is also a failure. Both collapse
 // into one outcome the action hook classifies via classifyPrSidebarFailure.
 async function sendGithubPrMutation(
-  client: Pick<RpcClient, 'sendRequest'>,
+  client: RpcRequestSender,
   method: string,
   params: Record<string, unknown>,
   options?: { timeoutMs?: number }
@@ -83,7 +83,7 @@ async function sendGithubPrMutation(
 }
 
 export async function fetchMergePR(
-  client: Pick<RpcClient, 'sendRequest'>,
+  client: RpcRequestSender,
   worktreeId: string,
   args: { prNumber: number; method?: GitHubPRMergeMethod; prRepo?: GitHubPrRepoSlug | null },
   options?: { timeoutMs?: number }
@@ -104,7 +104,7 @@ export async function fetchMergePR(
 // which sendGithubPrMutation reads via its "no structured status" success branch
 // only when not boolean — so handle the boolean explicitly like resolveReviewThread.
 export async function fetchUpdatePRTitle(
-  client: Pick<RpcClient, 'sendRequest'>,
+  client: RpcRequestSender,
   worktreeId: string,
   args: { prNumber: number; title: string; prRepo?: GitHubPrRepoSlug | null }
 ): Promise<GitHubPrMutationOutcome> {
@@ -126,7 +126,7 @@ export async function fetchUpdatePRTitle(
 }
 
 export async function fetchSetPRAutoMerge(
-  client: Pick<RpcClient, 'sendRequest'>,
+  client: RpcRequestSender,
   worktreeId: string,
   args: {
     prNumber: number
@@ -147,7 +147,7 @@ export async function fetchSetPRAutoMerge(
 }
 
 export async function fetchUpdatePRState(
-  client: Pick<RpcClient, 'sendRequest'>,
+  client: RpcRequestSender,
   worktreeId: string,
   args: { prNumber: number; state: 'open' | 'closed'; prRepo?: GitHubPrRepoSlug | null }
 ): Promise<GitHubPrMutationOutcome> {
@@ -164,7 +164,7 @@ export async function fetchUpdatePRState(
 }
 
 export async function fetchRequestPRReviewers(
-  client: Pick<RpcClient, 'sendRequest'>,
+  client: RpcRequestSender,
   worktreeId: string,
   args: { prNumber: number; reviewers: string[]; prRepo?: GitHubPrRepoSlug | null }
 ): Promise<GitHubPrMutationOutcome> {
@@ -181,7 +181,7 @@ export async function fetchRequestPRReviewers(
 }
 
 export async function fetchRemovePRReviewers(
-  client: Pick<RpcClient, 'sendRequest'>,
+  client: RpcRequestSender,
   worktreeId: string,
   args: { prNumber: number; reviewers: string[]; prRepo?: GitHubPrRepoSlug | null }
 ): Promise<GitHubPrMutationOutcome> {
@@ -201,7 +201,7 @@ export async function fetchRemovePRReviewers(
 // (`{ ok, comment } | { ok:false, error }`), which sendGithubPrMutation reads via
 // its `ok in result` branch. We refetch afterward, so the returned comment is unused.
 export async function fetchAddPRReviewCommentReply(
-  client: Pick<RpcClient, 'sendRequest'>,
+  client: RpcRequestSender,
   worktreeId: string,
   args: {
     prNumber: number
@@ -238,7 +238,7 @@ export async function fetchAddPRReviewCommentReply(
 
 // Add a root conversation comment to a PR or an issue. Host returns GitHubCommentResult.
 export async function fetchAddIssueComment(
-  client: Pick<RpcClient, 'sendRequest'>,
+  client: RpcRequestSender,
   worktreeId: string,
   args: {
     prNumber: number
@@ -265,7 +265,7 @@ export async function fetchAddIssueComment(
 // the matching GraphQL mutation). Unlike the comment mutations, the host returns a
 // bare boolean, so a falsy result is a failure rather than the "no status" success.
 export async function fetchResolveReviewThread(
-  client: Pick<RpcClient, 'sendRequest'>,
+  client: RpcRequestSender,
   worktreeId: string,
   args: { threadId: string; resolve: boolean; prRepo?: GitHubPrRepoSlug | null }
 ): Promise<GitHubPrMutationOutcome> {
@@ -298,7 +298,7 @@ export async function fetchResolveReviewThread(
 // directly rather than via buildGithubPrParams. Host returns the
 // GitHubProjectMutationResult `{ ok }` envelope sendGithubPrMutation reads.
 export async function fetchUpdateIssueComment(
-  client: Pick<RpcClient, 'sendRequest'>,
+  client: RpcRequestSender,
   args: { owner: string; repo: string; host?: string; commentId: number; body: string }
 ): Promise<GitHubPrMutationOutcome> {
   return sendGithubPrMutation(client, 'github.project.updateIssueCommentBySlug', {
@@ -310,7 +310,7 @@ export async function fetchUpdateIssueComment(
 
 // Delete a root conversation (issue) comment. Slug-addressed like the edit wrapper.
 export async function fetchDeleteIssueComment(
-  client: Pick<RpcClient, 'sendRequest'>,
+  client: RpcRequestSender,
   args: { owner: string; repo: string; host?: string; commentId: number }
 ): Promise<GitHubPrMutationOutcome> {
   return sendGithubPrMutation(client, 'github.project.deleteIssueCommentBySlug', {
@@ -320,7 +320,7 @@ export async function fetchDeleteIssueComment(
 }
 
 export async function fetchRerunPRChecks(
-  client: Pick<RpcClient, 'sendRequest'>,
+  client: RpcRequestSender,
   worktreeId: string,
   args: {
     prNumber: number
diff --git a/mobile/src/tasks/native-host-task-detail-operations.ts b/mobile/src/tasks/native-host-task-detail-operations.ts
index 32e09747d47..969020c8701 100644
--- a/mobile/src/tasks/native-host-task-detail-operations.ts
+++ b/mobile/src/tasks/native-host-task-detail-operations.ts
@@ -5,8 +5,7 @@ import type {
 import type { MobileWebTaskLinearIssue } from '../../../src/shared/mobile-web/task-list-contract'
 import type { HostTaskDetailOperations } from './host-task-detail-operations'
 import { projectGitHubTaskDetail } from './github-task-detail-projection'
-import type { RpcClient } from '../transport/rpc-client'
-import type { RpcSuccess } from '../transport/types'
+import type { RpcRequestSender } from '../transport/rpc-client'
 
 type GitLabRawDetails = Partial<MobileWebTaskGitLabDetailResult> & {
   item?: {
@@ -15,7 +14,7 @@ type GitLabRawDetails = Partial<MobileWebTaskGitLabDetailResult> & {
   }
 }
 
-export function nativeHostTaskDetailOperations(client: RpcClient): HostTaskDetailOperations {
+export function nativeHostTaskDetailOperations(client: RpcRequestSender): HostTaskDetailOperations {
   return {
     async listGitHubLabels(repoId) {
       return successfulResult(
@@ -114,5 +113,5 @@ async function successfulResult<T>(request: Promise<unknown>): Promise<T> {
   if (!response.ok) {
     throw new Error(response.error?.message ?? 'Task provider request failed')
   }
-  return (response as RpcSuccess).result as T
+  return response.result as T
 }
diff --git a/mobile/src/tasks/native-host-task-item-file-operations.ts b/mobile/src/tasks/native-host-task-item-file-operations.ts
index 0a69cff9e7a..17a37175c5d 100644
--- a/mobile/src/tasks/native-host-task-item-file-operations.ts
+++ b/mobile/src/tasks/native-host-task-item-file-operations.ts
@@ -1,7 +1,9 @@
 import type { HostTaskItemFileOperations } from './host-task-item-file-operations'
-import type { RpcClient } from '../transport/rpc-client'
+import type { RpcRequestSender } from '../transport/rpc-client'
 
-export function nativeHostTaskItemFileOperations(client: RpcClient): HostTaskItemFileOperations {
+export function nativeHostTaskItemFileOperations(
+  client: RpcRequestSender
+): HostTaskItemFileOperations {
   return {
     async refreshChecks(target, headSha) {
       const checks = await request(client, 'github.prChecks', {
@@ -70,14 +72,14 @@ function repoPayload(target: { repoId: string }) {
 }
 
 async function request<T = unknown>(
-  client: RpcClient,
+  client: RpcRequestSender,
   method: string,
   payload: object,
   timeoutMs = 30_000
 ): Promise<T> {
   const response = await client.sendRequest(method, payload, { timeoutMs })
   if (!response.ok) {
-    throw new Error(response.error.message)
+    throw new Error(response.error?.message ?? 'Task request failed')
   }
   return response.result as T
 }
diff --git a/mobile/src/tasks/native-host-task-item-mutation-operations.ts b/mobile/src/tasks/native-host-task-item-mutation-operations.ts
index 1e69db11c7f..6c8498a4ffd 100644
--- a/mobile/src/tasks/native-host-task-item-mutation-operations.ts
+++ b/mobile/src/tasks/native-host-task-item-mutation-operations.ts
@@ -3,10 +3,10 @@ import type {
   HostTaskItemMutationOperations,
   HostTaskItemMutationTarget
 } from './host-task-item-mutation-operations'
-import type { RpcClient } from '../transport/rpc-client'
+import type { RpcRequestSender } from '../transport/rpc-client'
 
 export function nativeHostTaskItemMutationOperations(
-  client: RpcClient
+  client: RpcRequestSender
 ): HostTaskItemMutationOperations {
   return {
     async setClosed(target, closed) {
@@ -27,7 +27,7 @@ export function nativeHostTaskItemMutationOperations(
 }
 
 function setGitHubClosed(
-  client: RpcClient,
+  client: RpcRequestSender,
   target: Extract<HostTaskItemMutationTarget, { provider: 'github' }>,
   closed: boolean
 ) {
@@ -46,7 +46,7 @@ function setGitHubClosed(
 }
 
 function setGitLabClosed(
-  client: RpcClient,
+  client: RpcRequestSender,
   target: Extract<HostTaskItemMutationTarget, { provider: 'gitlab' }>,
   closed: boolean
 ) {
@@ -67,7 +67,7 @@ function setGitLabClosed(
 }
 
 function updateGitHubMetadata(
-  client: RpcClient,
+  client: RpcRequestSender,
   target: Extract<HostTaskItemMutationTarget, { provider: 'github' }>,
   updates: MobileWebTaskItemMetadataUpdates
 ) {
@@ -89,7 +89,7 @@ function updateGitHubMetadata(
 }
 
 function updateGitLabMetadata(
-  client: RpcClient,
+  client: RpcRequestSender,
   target: Extract<HostTaskItemMutationTarget, { provider: 'gitlab' }>,
   updates: MobileWebTaskItemMetadataUpdates
 ) {
@@ -122,11 +122,11 @@ function updateGitLabMetadata(
 }
 
 function assertMutation(
-  response: Awaited<ReturnType<RpcClient['sendRequest']>>,
+  response: Awaited<ReturnType<RpcRequestSender['sendRequest']>>,
   fallback: string
 ): void {
   if (!response.ok) {
-    throw new Error(response.error.message)
+    throw new Error(response.error?.message ?? 'Task request failed')
   }
   const result = response.result as { ok?: boolean; error?: string }
   if (result.ok === false) {
diff --git a/mobile/src/tasks/native-host-task-item-review-operations.ts b/mobile/src/tasks/native-host-task-item-review-operations.ts
index 78f8927d893..99eefe2ddc1 100644
--- a/mobile/src/tasks/native-host-task-item-review-operations.ts
+++ b/mobile/src/tasks/native-host-task-item-review-operations.ts
@@ -1,10 +1,10 @@
 import type { MobileWebTaskDetailComment } from '../../../src/shared/mobile-web/task-detail-contract'
 import type { HostTaskItemMutationTarget } from './host-task-item-mutation-operations'
 import type { HostTaskItemReviewOperations } from './host-task-item-review-operations'
-import type { RpcClient } from '../transport/rpc-client'
+import type { RpcRequestSender } from '../transport/rpc-client'
 
 export function nativeHostTaskItemReviewOperations(
-  client: RpcClient
+  client: RpcRequestSender
 ): HostTaskItemReviewOperations {
   return {
     async addComment(target, body) {
@@ -89,7 +89,7 @@ export function nativeHostTaskItemReviewOperations(
 }
 
 function addGitLabComment(
-  client: RpcClient,
+  client: RpcRequestSender,
   target: Extract<HostTaskItemMutationTarget, { provider: 'gitlab' }>,
   body: string
 ) {
@@ -117,11 +117,11 @@ function addGitLabComment(
 }
 
 function mutationComment(
-  response: Awaited<ReturnType<RpcClient['sendRequest']>>,
+  response: Awaited<ReturnType<RpcRequestSender['sendRequest']>>,
   fallback: string
 ): MobileWebTaskDetailComment | undefined {
   if (!response.ok) {
-    throw new Error(response.error.message)
+    throw new Error(response.error?.message ?? 'Task request failed')
   }
   const result = response.result as {
     ok?: boolean
@@ -135,11 +135,11 @@ function mutationComment(
 }
 
 function assertMutation(
-  response: Awaited<ReturnType<RpcClient['sendRequest']>>,
+  response: Awaited<ReturnType<RpcRequestSender['sendRequest']>>,
   fallback: string
 ): void {
   if (!response.ok) {
-    throw new Error(response.error.message)
+    throw new Error(response.error?.message ?? 'Task request failed')
   }
   const result = response.result as { ok?: boolean; error?: string }
   if (result.ok === false) {
diff --git a/mobile/src/tasks/native-host-task-linear-operations.ts b/mobile/src/tasks/native-host-task-linear-operations.ts
index 5bc61e40010..4f2fd3c2679 100644
--- a/mobile/src/tasks/native-host-task-linear-operations.ts
+++ b/mobile/src/tasks/native-host-task-linear-operations.ts
@@ -1,7 +1,7 @@
 import type { HostTaskLinearOperations } from './host-task-linear-operations'
-import type { RpcClient } from '../transport/rpc-client'
+import type { RpcRequestSender } from '../transport/rpc-client'
 
-export function nativeHostTaskLinearOperations(client: RpcClient): HostTaskLinearOperations {
+export function nativeHostTaskLinearOperations(client: RpcRequestSender): HostTaskLinearOperations {
   return {
     async connect(apiKey) {
       assertMutation(
@@ -74,13 +74,13 @@ export function nativeHostTaskLinearOperations(client: RpcClient): HostTaskLinea
 }
 
 async function request<T = unknown>(
-  client: RpcClient,
+  client: RpcRequestSender,
   method: string,
   payload?: object
 ): Promise<T> {
   const response = await client.sendRequest(method, payload, { timeoutMs: 30_000 })
   if (!response.ok) {
-    throw new Error(response.error.message)
+    throw new Error(response.error?.message ?? 'Task request failed')
   }
   return response.result as T
 }
diff --git a/mobile/src/tasks/native-host-task-list-operations.ts b/mobile/src/tasks/native-host-task-list-operations.ts
index ad3dbc51c22..532f4efdb84 100644
--- a/mobile/src/tasks/native-host-task-list-operations.ts
+++ b/mobile/src/tasks/native-host-task-list-operations.ts
@@ -1,9 +1,8 @@
 import { extractLinearIssueReadItems } from './linear-mobile-issue-read'
 import type { HostTaskListOperations } from './host-task-list-operations'
-import type { RpcClient } from '../transport/rpc-client'
-import type { RpcSuccess } from '../transport/types'
+import type { RpcRequestSender } from '../transport/rpc-client'
 
-export function nativeHostTaskListOperations(client: RpcClient): HostTaskListOperations {
+export function nativeHostTaskListOperations(client: RpcRequestSender): HostTaskListOperations {
   return {
     async listGitHub(payload) {
       return successfulResult(
@@ -73,5 +72,5 @@ async function successfulResult<T>(request: Promise<unknown>): Promise<T> {
   if (!response.ok) {
     throw new Error(response.error?.message ?? 'Task provider request failed')
   }
-  return (response as RpcSuccess).result as T
+  return response.result as T
 }
diff --git a/mobile/src/tasks/native-host-task-preference-operations.ts b/mobile/src/tasks/native-host-task-preference-operations.ts
index 64e7f3ce014..06986c2f475 100644
--- a/mobile/src/tasks/native-host-task-preference-operations.ts
+++ b/mobile/src/tasks/native-host-task-preference-operations.ts
@@ -1,9 +1,9 @@
 import { persistSetupHookTrustApproval } from './setup-hook-trust'
 import type { HostTaskPreferenceOperations } from './host-task-preference-operations'
-import type { RpcClient } from '../transport/rpc-client'
+import type { RpcRequestSender } from '../transport/rpc-client'
 
 export function nativeHostTaskPreferenceOperations(
-  client: RpcClient
+  client: RpcRequestSender
 ): HostTaskPreferenceOperations {
   return {
     async updateResume(taskResumeState) {
diff --git a/mobile/src/tasks/native-host-task-project-file-operations.ts b/mobile/src/tasks/native-host-task-project-file-operations.ts
index 0f76b6aae8d..126bbf0eae3 100644
--- a/mobile/src/tasks/native-host-task-project-file-operations.ts
+++ b/mobile/src/tasks/native-host-task-project-file-operations.ts
@@ -1,9 +1,9 @@
 import type { HostTaskProjectFileOperations } from './host-task-project-file-operations'
 import type { HostTaskProjectItemTarget } from './host-task-project-mutation-operations'
-import type { RpcClient } from '../transport/rpc-client'
+import type { RpcRequestSender } from '../transport/rpc-client'
 
 export function nativeHostTaskProjectFileOperations(
-  client: RpcClient
+  client: RpcRequestSender
 ): HostTaskProjectFileOperations {
   return {
     async refreshChecks(target, repoId, headSha) {
@@ -60,13 +60,13 @@ function repoPayload(target: HostTaskProjectItemTarget, repoId: string) {
 }
 
 async function request<T = unknown>(
-  client: RpcClient,
+  client: RpcRequestSender,
   method: string,
   payload: object
 ): Promise<T> {
   const response = await client.sendRequest(method, payload, { timeoutMs: 30_000 })
   if (!response.ok) {
-    throw new Error(response.error.message)
+    throw new Error(response.error?.message ?? 'Task request failed')
   }
   return response.result as T
 }
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 539b7c31622..18aef9c0981 100644
--- a/mobile/src/tasks/native-host-task-project-mutation-operations.ts
+++ b/mobile/src/tasks/native-host-task-project-mutation-operations.ts
@@ -3,7 +3,7 @@ import type {
   HostTaskProjectItemTarget,
   HostTaskProjectMutationOperations
 } from './host-task-project-mutation-operations'
-import type { RpcClient } from '../transport/rpc-client'
+import type { RpcRequestSender } from '../transport/rpc-client'
 import {
   fetchAddIssueComment,
   fetchAddPRReviewCommentReply,
@@ -17,7 +17,7 @@ import {
 const PROJECT_PR_MUTATION_TIMEOUT_MS = 60_000
 
 export function nativeHostTaskProjectMutationOperations(
-  client: RpcClient
+  client: RpcRequestSender
 ): HostTaskProjectMutationOperations {
   return {
     async updateItem(target, updates) {
@@ -154,7 +154,7 @@ function slugPayload(target: HostTaskProjectItemTarget) {
 }
 
 async function projectMutation<T extends object = object>(
-  client: RpcClient,
+  client: RpcRequestSender,
   method: string,
   payload: object
 ): Promise<T> {
diff --git a/mobile/src/tasks/native-host-task-project-read-operations.ts b/mobile/src/tasks/native-host-task-project-read-operations.ts
index 5a834212004..0609bbf5d00 100644
--- a/mobile/src/tasks/native-host-task-project-read-operations.ts
+++ b/mobile/src/tasks/native-host-task-project-read-operations.ts
@@ -6,10 +6,10 @@ import type {
 import type { MobileWebTaskProjectTable } from '../../../src/shared/mobile-web/task-project-table-contract'
 import type { HostTaskProjectReadOperations } from './host-task-project-read-operations'
 import { projectGitHubTaskDetail } from './github-task-detail-projection'
-import type { RpcClient } from '../transport/rpc-client'
+import type { RpcRequestSender } from '../transport/rpc-client'
 
 export function nativeHostTaskProjectReadOperations(
-  client: RpcClient
+  client: RpcRequestSender
 ): HostTaskProjectReadOperations {
   return {
     async listAccessible(host) {
diff --git a/mobile/src/tasks/native-host-task-provider-write-operations.ts b/mobile/src/tasks/native-host-task-provider-write-operations.ts
index 84bba8048ff..be5741b80c6 100644
--- a/mobile/src/tasks/native-host-task-provider-write-operations.ts
+++ b/mobile/src/tasks/native-host-task-provider-write-operations.ts
@@ -1,8 +1,8 @@
 import type { HostTaskProviderWriteOperations } from './host-task-provider-write-operations'
-import type { RpcClient } from '../transport/rpc-client'
+import type { RpcRequestSender } from '../transport/rpc-client'
 
 export function nativeHostTaskProviderWriteOperations(
-  client: RpcClient
+  client: RpcRequestSender
 ): HostTaskProviderWriteOperations {
   return {
     async createIssue(payload) {
@@ -15,7 +15,7 @@ export function nativeHostTaskProviderWriteOperations(
         }
       )
       if (!response.ok) {
-        throw new Error(response.error.message)
+        throw new Error(response.error?.message ?? 'Task request failed')
       }
       const result = response.result as {
         ok?: boolean
@@ -41,7 +41,7 @@ export function nativeHostTaskProviderWriteOperations(
         { timeoutMs: 15_000 }
       )
       if (!response.ok) {
-        throw new Error(response.error.message)
+        throw new Error(response.error?.message ?? 'Task request failed')
       }
     }
   }
diff --git a/mobile/src/tasks/native-host-task-read-operations.ts b/mobile/src/tasks/native-host-task-read-operations.ts
index 03dcdb8a3b5..973e6032867 100644
--- a/mobile/src/tasks/native-host-task-read-operations.ts
+++ b/mobile/src/tasks/native-host-task-read-operations.ts
@@ -6,10 +6,9 @@ import type {
   HostTaskReadOperations,
   HostTaskRepository
 } from './host-task-read-operations'
-import type { RpcClient } from '../transport/rpc-client'
-import type { RpcSuccess } from '../transport/types'
+import type { RpcRequestReply, RpcRequestSender } from '../transport/rpc-client'
 
-export function nativeHostTaskReadOperations(client: RpcClient): HostTaskReadOperations {
+export function nativeHostTaskReadOperations(client: RpcRequestSender): HostTaskReadOperations {
   return {
     bootstrap: () => bootstrap(client),
     listRepositories: () => listRepositories(client),
@@ -18,10 +17,10 @@ export function nativeHostTaskReadOperations(client: RpcClient): HostTaskReadOpe
   }
 }
 
-async function bootstrap(client: RpcClient): Promise<HostTaskBootstrap> {
+async function bootstrap(client: RpcRequestSender): Promise<HostTaskBootstrap> {
   const statusResponse = await client.sendRequest('status.get')
   requireSuccess(statusResponse)
-  const status = (statusResponse as RpcSuccess).result as { capabilities?: string[] }
+  const status = statusResponse.result as { capabilities?: string[] }
   if (!status.capabilities?.includes(MOBILE_TASKS_CAPABILITY)) {
     return emptyBootstrap(false)
   }
@@ -53,17 +52,17 @@ async function bootstrap(client: RpcClient): Promise<HostTaskBootstrap> {
   }
 }
 
-async function listRepositories(client: RpcClient): Promise<HostTaskRepository[]> {
+async function listRepositories(client: RpcRequestSender): Promise<HostTaskRepository[]> {
   const response = await client.sendRequest('repo.list')
   requireSuccess(response)
-  const result = (response as RpcSuccess).result as { repos?: HostTaskRepository[] }
+  const result = response.result as { repos?: HostTaskRepository[] }
   return result.repos ?? []
 }
 
-async function loadLinearContext(client: RpcClient): Promise<HostTaskLinearContext> {
+async function loadLinearContext(client: RpcRequestSender): Promise<HostTaskLinearContext> {
   const statusResponse = await client.sendRequest('linear.status')
   requireSuccess(statusResponse)
-  const status = normalizeLinearStatus((statusResponse as RpcSuccess).result)
+  const status = normalizeLinearStatus(statusResponse.result)
   if (!status.connected) {
     return { status, teams: [] }
   }
@@ -75,12 +74,12 @@ async function loadLinearContext(client: RpcClient): Promise<HostTaskLinearConte
   requireSuccess(teamsResponse)
   return {
     status: { ...status, selectedWorkspaceId: workspaceId },
-    teams: (teamsResponse as RpcSuccess).result as HostTaskLinearContext['teams']
+    teams: teamsResponse.result as HostTaskLinearContext['teams']
   }
 }
 
 async function resolveGitHubRepoSlug(
-  client: RpcClient,
+  client: RpcRequestSender,
   repoId: string
 ): Promise<GitHubOwnerRepo | null> {
   const response = await client.sendRequest(
@@ -89,7 +88,7 @@ async function resolveGitHubRepoSlug(
     { timeoutMs: 30_000 }
   )
   requireSuccess(response)
-  return (response as RpcSuccess).result as GitHubOwnerRepo | null
+  return response.result as GitHubOwnerRepo | null
 }
 
 function emptyBootstrap(supported: boolean): HostTaskBootstrap {
@@ -113,11 +112,13 @@ function normalizeLinearStatus(value: unknown): HostTaskBootstrap['linearStatus'
   }
 }
 
-function successResult<T>(response: { ok: boolean; result?: unknown }): T | null {
+function successResult<T>(response: RpcRequestReply): T | null {
   return response.ok ? (response.result as T) : null
 }
 
-function requireSuccess(response: { ok: boolean; error?: { message?: string } }): void {
+function requireSuccess(
+  response: RpcRequestReply
+): asserts response is { ok: true; result: unknown } {
   if (!response.ok) {
     throw new Error(response.error?.message ?? 'Task operation failed')
   }
diff --git a/mobile/src/tasks/setup-hook-trust.ts b/mobile/src/tasks/setup-hook-trust.ts
index 72381393989..493f4ba9d2c 100644
--- a/mobile/src/tasks/setup-hook-trust.ts
+++ b/mobile/src/tasks/setup-hook-trust.ts
@@ -1,5 +1,5 @@
 import type { PersistedTrustedOrcaHooks } from '../../../src/shared/orca-yaml-hook-types'
-import type { RpcClient } from '../transport/rpc-client'
+import type { RpcRequestSender } from '../transport/rpc-client'
 
 export type SetupHookTrust = {
   contentHash: string
@@ -38,7 +38,7 @@ export function trustedOrcaHooksWithSetupApproval(args: {
 }
 
 export async function persistSetupHookTrustApproval(args: {
-  client: RpcClient
+  client: RpcRequestSender
   trust: PersistedTrustedOrcaHooks
   repoId: string
   contentHash: string
@@ -47,7 +47,7 @@ export async function persistSetupHookTrustApproval(args: {
   const next = trustedOrcaHooksWithSetupApproval(args)
   const response = await args.client.sendRequest('ui.set', { trustedOrcaHooks: next })
   if (!response.ok) {
-    throw new Error(response.error.message)
+    throw new Error(response.error?.message ?? 'Hook trust update failed')
   }
   return next
 }
diff --git a/mobile/src/tasks/web-host-task-rpc-sender.ts b/mobile/src/tasks/web-host-task-rpc-sender.ts
new file mode 100644
index 00000000000..98de846bd8e
--- /dev/null
+++ b/mobile/src/tasks/web-host-task-rpc-sender.ts
@@ -0,0 +1,19 @@
+import type { MobileWebHostRequestClient } from '../../../src/mobile-web/src/mobile-web-host-request-client'
+import type { RpcRequestSender } from '../transport/rpc-client'
+
+/** The hosted page reaches the same desktop methods the native app calls, so the task operation
+ * modules are shared verbatim. A desktop error arrives as a rejected bridge request, never as an
+ * `ok: false` reply, which is why this sender only ever resolves successes. */
+export function webHostTaskRpcSender(host: MobileWebHostRequestClient): RpcRequestSender {
+  return {
+    async sendRequest(method, params) {
+      return { ok: true, result: await host.request({ method, params: hostParams(params) }) }
+    }
+  }
+}
+
+function hostParams(params: unknown): Record<string, unknown> {
+  return typeof params === 'object' && params !== null && !Array.isArray(params)
+    ? (params as Record<string, unknown>)
+    : {}
+}
diff --git a/mobile/src/transport/rpc-client.ts b/mobile/src/transport/rpc-client.ts
index 01bdd2e8fce..f2b006b6508 100644
--- a/mobile/src/transport/rpc-client.ts
+++ b/mobile/src/transport/rpc-client.ts
@@ -18,6 +18,22 @@ export type SendRequestOptions = {
   beforeSend?: () => void
 }
 
+/** A unary reply as its caller reads it. The hosted page answers over the capability bridge, which
+ * carries no request id or runtime metadata, so those stay on the transport's own `RpcResponse`. */
+export type RpcRequestReply =
+  | { ok: true; result: unknown }
+  | { ok: false; error?: { code?: string; message?: string } }
+
+/** The only surface a unary caller needs, so the same operation modules serve the native app over a
+ * socket and the hosted page over the bridge. */
+export type RpcRequestSender = {
+  sendRequest: (
+    method: string,
+    params?: unknown,
+    options?: SendRequestOptions
+  ) => Promise<RpcRequestReply>
+}
+
 type StreamingListener = (result: unknown) => void
 
 export type RpcClient = {