diff --git a/src/hooks/anthropic-context-window-limit-recovery/aggressive-truncation-strategy.ts b/src/hooks/anthropic-context-window-limit-recovery/aggressive-truncation-strategy.ts
index 5fdcbe87c..be7580137 100644
--- a/src/hooks/anthropic-context-window-limit-recovery/aggressive-truncation-strategy.ts
+++ b/src/hooks/anthropic-context-window-limit-recovery/aggressive-truncation-strategy.ts
@@ -17,7 +17,7 @@ import {
   findNearestMessageWithFields,
   findNearestMessageWithFieldsFromSDK,
 } from "../../features/hook-message-injector"
-import { promptAsyncAfterSessionIdle } from "../shared/prompt-async-gate"
+import { dispatchInternalPrompt } from "../shared/prompt-async-gate"
 
 export async function runAggressiveTruncationStrategy(params: {
   sessionID: string
@@ -88,7 +88,8 @@ export async function runAggressiveTruncationStrategy(params: {
         const launchVariant = previousMessage?.model?.variant
         const inheritedTools = resolveInheritedPromptTools(params.sessionID, previousMessage?.tools)
 
-        const promptResult = await promptAsyncAfterSessionIdle({
+        const promptResult = await dispatchInternalPrompt({
+          mode: "async",
           client: params.client,
           sessionID: params.sessionID,
           source: "auto-compact",
diff --git a/src/hooks/atlas/boulder-continuation-injector.ts b/src/hooks/atlas/boulder-continuation-injector.ts
index 4535b2470..4451903ae 100644
--- a/src/hooks/atlas/boulder-continuation-injector.ts
+++ b/src/hooks/atlas/boulder-continuation-injector.ts
@@ -6,7 +6,7 @@ import {
 import { stripAgentListSortPrefix } from "../../shared/agent-display-names"
 import { log } from "../../shared/logger"
 import { createInternalAgentContinuationTextPart, resolveInheritedPromptTools } from "../../shared"
-import { promptAsyncAfterSessionIdle } from "../shared/prompt-async-gate"
+import { dispatchInternalPrompt } from "../shared/prompt-async-gate"
 import { HOOK_NAME } from "./hook-name"
 import { BOULDER_CONTINUATION_PROMPT } from "./system-reminder-templates"
 import { resolveRecentPromptContextForSession } from "./recent-model-resolver"
@@ -92,21 +92,22 @@ export async function injectBoulderContinuation(input: {
       : undefined
     const launchVariant = promptContext.model?.variant
 
-    const promptResult = await promptAsyncAfterSessionIdle({
+    const promptResult = await dispatchInternalPrompt({
+      mode: "async",
       client: ctx.client,
       sessionID,
       source: HOOK_NAME,
       settleMs: idleSettleMs,
       input: {
-      path: { id: sessionID },
-      body: {
-        agent: continuationAgent,
-        ...(launchModel ? { model: launchModel } : {}),
-        ...(launchVariant ? { variant: launchVariant } : {}),
-        ...(inheritedTools ? { tools: inheritedTools } : {}),
-        parts: [createInternalAgentContinuationTextPart(prompt)],
-      },
-      query: { directory: ctx.directory },
+        path: { id: sessionID },
+        body: {
+          agent: continuationAgent,
+          ...(launchModel ? { model: launchModel } : {}),
+          ...(launchVariant ? { variant: launchVariant } : {}),
+          ...(inheritedTools ? { tools: inheritedTools } : {}),
+          parts: [createInternalAgentContinuationTextPart(prompt)],
+        },
+        query: { directory: ctx.directory },
       },
     })
     if (promptResult.status === "failed") {
diff --git a/src/hooks/atlas/idle-event.ts b/src/hooks/atlas/idle-event.ts
index 4dce6ab4b..973b079ec 100644
--- a/src/hooks/atlas/idle-event.ts
+++ b/src/hooks/atlas/idle-event.ts
@@ -20,7 +20,7 @@ import { createInternalAgentContinuationTextPart } from "../../shared"
 import { getAgentConfigKey } from "../../shared/agent-display-names"
 import { log } from "../../shared/logger"
 import { shouldPromptAfterSessionIdle } from "../shared/session-idle-settle"
-import { promptAsyncAfterSessionIdle } from "../shared/prompt-async-gate"
+import { dispatchInternalPrompt } from "../shared/prompt-async-gate"
 import { injectBoulderContinuation } from "./boulder-continuation-injector"
 import { HOOK_NAME } from "./hook-name"
 import { resolveActiveBoulderSession } from "./resolve-active-boulder-session"
@@ -291,7 +291,8 @@ export async function handleAtlasSessionIdle(input: {
         return
       }
 
-      const promptResult = await promptAsyncAfterSessionIdle({
+      const promptResult = await dispatchInternalPrompt({
+        mode: "async",
         client: ctx.client,
         sessionID,
         source: HOOK_NAME,
diff --git a/src/hooks/claude-code-hooks/handlers/session-event-handler.ts b/src/hooks/claude-code-hooks/handlers/session-event-handler.ts
index 8326fdb5f..a9ed6deb8 100644
--- a/src/hooks/claude-code-hooks/handlers/session-event-handler.ts
+++ b/src/hooks/claude-code-hooks/handlers/session-event-handler.ts
@@ -8,7 +8,7 @@ import { clearToolInputCache, stopToolInputCacheCleanup } from "../tool-input-ca
 import type { PluginConfig } from "../types"
 import { createInternalAgentTextPart, isHookDisabled, log } from "../../../shared"
 import { resolveSessionEventID } from "../../../shared/event-session-id"
-import { promptAfterSessionIdle } from "../../../shared/prompt-async-gate"
+import { dispatchInternalPrompt } from "../../../shared/prompt-async-gate"
 import {
 	clearAllSessionHookState,
 	clearSessionHookState,
@@ -109,7 +109,8 @@ export function createSessionEventHandler(
 				})
 			} else if (stopResult.block && stopResult.injectPrompt) {
 				log("Stop hook returned block with inject_prompt", { sessionID })
-				const promptResult = await promptAfterSessionIdle({
+				const promptResult = await dispatchInternalPrompt({
+					mode: "sync",
 					client: ctx.client,
 					sessionID,
 					source: "claude-code-stop-hook:inject-prompt",
diff --git a/src/hooks/compaction-context-injector/recovery.ts b/src/hooks/compaction-context-injector/recovery.ts
index 91713d7e2..e0cb37c12 100644
--- a/src/hooks/compaction-context-injector/recovery.ts
+++ b/src/hooks/compaction-context-injector/recovery.ts
@@ -21,7 +21,7 @@ import {
 import { AGENT_RECOVERY_PROMPT, NO_TEXT_TAIL_THRESHOLD, RECOVERY_COOLDOWN_MS, RECENT_COMPACTION_WINDOW_MS } from "./constants"
 import type { CompactionContextClient } from "./types"
 import type { TailMonitorState } from "./tail-monitor"
-import { promptAsyncAfterSessionIdle, releasePromptAsyncReservation } from "../shared/prompt-async-gate"
+import { dispatchInternalPrompt, releasePromptAsyncReservation } from "../shared/prompt-async-gate"
 
 export function createRecoveryLogic(
   ctx: CompactionContextClient | undefined,
@@ -82,7 +82,8 @@ export function createRecoveryLogic(
     }
 
     try {
-      const promptResult = await promptAsyncAfterSessionIdle({
+      const promptResult = await dispatchInternalPrompt({
+        mode: "async",
         client: ctx.client,
         sessionID,
         source: "compaction-context-injector",
diff --git a/src/hooks/ralph-loop/continuation-prompt-injector.ts b/src/hooks/ralph-loop/continuation-prompt-injector.ts
index fd9c133e2..30b12f8ca 100644
--- a/src/hooks/ralph-loop/continuation-prompt-injector.ts
+++ b/src/hooks/ralph-loop/continuation-prompt-injector.ts
@@ -10,7 +10,7 @@ import {
 	resolveInheritedPromptTools,
 } from "../../shared"
 import { normalizeAgentForPrompt, stripAgentListSortPrefix } from "../../shared/agent-display-names"
-import { promptAsyncAfterSessionIdle } from "../shared/prompt-async-gate"
+import { dispatchInternalPrompt } from "../shared/prompt-async-gate"
 
 type MessageInfo = {
 	agent?: string
@@ -139,7 +139,8 @@ export async function injectContinuationPrompt(
 
 	let response: unknown
 	try {
-		const promptResult = await promptAsyncAfterSessionIdle({
+		const promptResult = await dispatchInternalPrompt({
+			mode: "async",
 			client: ctx.client,
 			sessionID: options.sessionID,
 			source: "ralph-loop",
diff --git a/src/hooks/runtime-fallback/auto-retry.ts b/src/hooks/runtime-fallback/auto-retry.ts
index 74d7932b5..5e907b270 100644
--- a/src/hooks/runtime-fallback/auto-retry.ts
+++ b/src/hooks/runtime-fallback/auto-retry.ts
@@ -12,7 +12,7 @@ import { getLastUserRetryPayload } from "./last-user-retry-parts"
 import { extractSessionMessages } from "./session-messages"
 import { resolveRegisteredAgentName } from "../../features/claude-code-session-state"
 import {
-  promptAsyncAfterSessionIdle,
+  dispatchInternalPrompt,
   releasePromptAsyncReservation,
 } from "../shared/prompt-async-gate"
 
@@ -157,7 +157,8 @@ export function createAutoRetryHelpers(deps: HookDeps) {
         sessionAwaitingFallbackResult.add(sessionID)
         scheduleSessionFallbackTimeout(sessionID, retryAgent)
 
-        const promptResult = await promptAsyncAfterSessionIdle({
+        const promptResult = await dispatchInternalPrompt({
+          mode: "async",
           client: ctx.client,
           sessionID,
           source: `runtime-fallback:${source}`,
diff --git a/src/hooks/session-recovery/recover-tool-result-missing.ts b/src/hooks/session-recovery/recover-tool-result-missing.ts
index ec504067e..2f7e30b0f 100644
--- a/src/hooks/session-recovery/recover-tool-result-missing.ts
+++ b/src/hooks/session-recovery/recover-tool-result-missing.ts
@@ -3,7 +3,7 @@ import type { MessageData, ResumeConfig } from "./types"
 import { readParts } from "./storage/parts-reader"
 import { isSqliteBackend } from "../../shared/opencode-storage-detection"
 import { normalizeSDKResponse } from "../../shared"
-import { promptAsyncAfterSessionIdle } from "../shared/prompt-async-gate"
+import { dispatchInternalPrompt } from "../shared/prompt-async-gate"
 
 type Client = ReturnType<typeof createOpencodeClient>
 type ToolResultContent = { type: "text"; text: string }
@@ -169,7 +169,8 @@ export async function recoverToolResultMissing(
       return false
     }
 
-    const promptResult = await promptAsyncAfterSessionIdle({
+    const promptResult = await dispatchInternalPrompt({
+      mode: "async",
       client,
       sessionID,
       source: options?.source ?? "session-recovery-tool-result-missing",
diff --git a/src/hooks/session-recovery/recover-unavailable-tool.ts b/src/hooks/session-recovery/recover-unavailable-tool.ts
index 2b8cf0702..4d703eeeb 100644
--- a/src/hooks/session-recovery/recover-unavailable-tool.ts
+++ b/src/hooks/session-recovery/recover-unavailable-tool.ts
@@ -4,7 +4,7 @@ import { readParts } from "./storage"
 import type { MessageData } from "./types"
 import { normalizeSDKResponse } from "../../shared"
 import { isSqliteBackend } from "../../shared/opencode-storage-detection"
-import { promptAsyncAfterSessionIdle } from "../shared/prompt-async-gate"
+import { dispatchInternalPrompt } from "../shared/prompt-async-gate"
 
 type Client = ReturnType<typeof createOpencodeClient>
 
@@ -119,7 +119,8 @@ export async function recoverUnavailableTool(
       return false
     }
 
-    const promptResult = await promptAsyncAfterSessionIdle<PromptWithToolResultInput>({
+    const promptResult = await dispatchInternalPrompt<PromptWithToolResultInput>({
+      mode: "async",
       client,
       sessionID,
       source: "session-recovery-unavailable-tool",
diff --git a/src/hooks/session-recovery/resume.ts b/src/hooks/session-recovery/resume.ts
index 24fbd05b0..2dd641644 100644
--- a/src/hooks/session-recovery/resume.ts
+++ b/src/hooks/session-recovery/resume.ts
@@ -4,7 +4,7 @@ import {
   isRealUserMessage,
   resolveInheritedPromptTools,
 } from "../../shared"
-import { promptAsyncAfterSessionIdle } from "../shared/prompt-async-gate"
+import { dispatchInternalPrompt } from "../shared/prompt-async-gate"
 import type { MessageData, ResumeConfig } from "./types"
 
 const RECOVERY_RESUME_TEXT = "[session recovered - continuing previous task]"
@@ -38,7 +38,8 @@ export async function resumeSession(client: Client, config: ResumeConfig): Promi
       : undefined
     const launchVariant = config.model?.variant
 
-    const promptResult = await promptAsyncAfterSessionIdle({
+    const promptResult = await dispatchInternalPrompt({
+      mode: "async",
       client,
       sessionID: config.sessionID,
       source: "session-recovery",
diff --git a/src/hooks/team-session-events/team-idle-wake-hint.ts b/src/hooks/team-session-events/team-idle-wake-hint.ts
index c9f8fbd95..6c654dd18 100644
--- a/src/hooks/team-session-events/team-idle-wake-hint.ts
+++ b/src/hooks/team-session-events/team-idle-wake-hint.ts
@@ -9,7 +9,7 @@ import { listUnreadMessages } from "../../features/team-mode/team-mailbox/inbox"
 import { loadRuntimeState, transitionRuntimeState } from "../../features/team-mode/team-state-store/store"
 import { resolveSessionEventID } from "../../shared/event-session-id"
 import { log } from "../../shared/logger"
-import { promptAsyncAfterSessionIdle } from "../shared/prompt-async-gate"
+import { dispatchInternalPrompt } from "../shared/prompt-async-gate"
 
 type PromptAsyncInput = {
   path: { id: string }
@@ -111,7 +111,8 @@ export function createTeamIdleWakeHint(ctx: TeamIdleWakeHintContext, config: Tea
       }
 
       applyMemberSessionRouting(sessionID, memberEntry)
-      const promptResult = await promptAsyncAfterSessionIdle({
+      const promptResult = await dispatchInternalPrompt({
+        mode: "async",
         client: ctx.client,
         sessionID,
         source: "team-idle-wake-hint",
diff --git a/src/hooks/todo-continuation-enforcer/continuation-injection.ts b/src/hooks/todo-continuation-enforcer/continuation-injection.ts
index d5a988bf8..8b121d6ca 100644
--- a/src/hooks/todo-continuation-enforcer/continuation-injection.ts
+++ b/src/hooks/todo-continuation-enforcer/continuation-injection.ts
@@ -22,7 +22,7 @@ import {
   normalizeAgentForPromptKey,
   stripAgentListSortPrefix,
 } from "../../shared/agent-display-names"
-import { promptAsyncAfterSessionIdle } from "../shared/prompt-async-gate"
+import { dispatchInternalPrompt } from "../shared/prompt-async-gate"
 
 import {
   CONTINUATION_PROMPT,
@@ -187,7 +187,8 @@ ${todoList}`
       : undefined
     const launchVariant = model?.variant
 
-    const promptResult = await promptAsyncAfterSessionIdle({
+    const promptResult = await dispatchInternalPrompt({
+      mode: "async",
       client: ctx.client,
       sessionID,
       source: HOOK_NAME,
diff --git a/src/hooks/unstable-agent-babysitter/unstable-agent-babysitter-hook.ts b/src/hooks/unstable-agent-babysitter/unstable-agent-babysitter-hook.ts
index 30cb01cca..3d39dee93 100644
--- a/src/hooks/unstable-agent-babysitter/unstable-agent-babysitter-hook.ts
+++ b/src/hooks/unstable-agent-babysitter/unstable-agent-babysitter-hook.ts
@@ -12,7 +12,7 @@ import {
   isUnstableTask,
   THINKING_SUMMARY_MAX_CHARS,
 } from "./task-message-analyzer"
-import { promptAsyncAfterSessionIdle } from "../shared/prompt-async-gate"
+import { dispatchInternalPrompt } from "../shared/prompt-async-gate"
 
 const HOOK_NAME = "unstable-agent-babysitter"
 const DEFAULT_TIMEOUT_MS = 120000
@@ -216,7 +216,8 @@ export function createUnstableAgentBabysitterHook(ctx: BabysitterContext, option
           ? { providerID: model.providerID, modelID: model.modelID }
           : undefined
         const launchVariant = model?.variant
-        const promptResult = await promptAsyncAfterSessionIdle({
+        const promptResult = await dispatchInternalPrompt({
+          mode: "async",
           client: ctx.client,
           sessionID: mainSessionID,
           source: HOOK_NAME,
diff --git a/src/shared/prompt-async-gate.ts b/src/shared/prompt-async-gate.ts
index df49a5ed1..033fbaff2 100644
--- a/src/shared/prompt-async-gate.ts
+++ b/src/shared/prompt-async-gate.ts
@@ -38,20 +38,9 @@ type PromptClient<TInput> = {
   }
 }
 
-type InternalPromptDispatchClient<TInput> = {
-  session?: {
-    status?: () => Promise<unknown>
-    messages?: (input: { path: { id: string }; query: PromptMessagesQuery }) => Promise<unknown>
-    promptAsync?: (input: TInput) => Promise<unknown>
-    prompt?: (input: TInput) => Promise<unknown>
-  }
-}
-
 export type InternalPromptDispatchMode = "async" | "sync"
 
-export type InternalPromptDispatchArgs<TInput = PromptAsyncInput> = {
-  mode: InternalPromptDispatchMode
-  client: InternalPromptDispatchClient<TInput>
+type InternalPromptDispatchCommonArgs<TInput> = {
   sessionID: string
   input: TInput
   source: string
@@ -62,6 +51,11 @@ export type InternalPromptDispatchArgs<TInput = PromptAsyncInput> = {
   checkToolState?: boolean
 }
 
+export type InternalPromptDispatchArgs<TInput = PromptAsyncInput> = InternalPromptDispatchCommonArgs<TInput> & (
+  | { mode: "async"; client: PromptAsyncClient<TInput> }
+  | { mode: "sync"; client: PromptClient<TInput> }
+)
+
 type PromptAsyncReservation = {
   source: string
   reservedAt: number
@@ -386,34 +380,6 @@ async function dispatchAfterSessionIdle<TInput>(args: {
   }
 }
 
-function getInternalPromptDispatcher<TInput>(
-  mode: InternalPromptDispatchMode,
-  session: InternalPromptDispatchClient<TInput>["session"],
-): {
-  sessionName: "promptAsync" | "prompt"
-  dispatch?: (input: TInput) => Promise<unknown>
-} {
-  if (mode === "async") {
-    if (typeof session?.promptAsync !== "function") {
-      return { sessionName: "promptAsync" }
-    }
-    const dispatchPromptAsync = session.promptAsync.bind(session)
-    return {
-      sessionName: "promptAsync",
-      dispatch: (input) => dispatchPromptAsync(input),
-    }
-  }
-
-  if (typeof session?.prompt !== "function") {
-    return { sessionName: "prompt" }
-  }
-  const dispatchPrompt = session.prompt.bind(session)
-  return {
-    sessionName: "prompt",
-    dispatch: (input) => dispatchPrompt(input),
-  }
-}
-
 export async function dispatchInternalPrompt<TInput = PromptAsyncInput>(
   args: InternalPromptDispatchArgs<TInput>,
 ): Promise<InternalPromptDispatchResult> {
@@ -426,7 +392,24 @@ export async function dispatchInternalPrompt<TInput = PromptAsyncInput>(
   } = args
   const postDispatchHoldMs = args.postDispatchHoldMs ?? DEFAULT_PROMPT_ASYNC_POST_DISPATCH_HOLD_MS
   const dispatchTimeoutMs = args.dispatchTimeoutMs ?? DEFAULT_PROMPT_DISPATCH_TIMEOUT_MS
-  const { sessionName, dispatch } = getInternalPromptDispatcher(args.mode, client.session)
+  const sessionName = args.mode === "async" ? "promptAsync" : "prompt"
+  const dispatch = (() => {
+    if (args.mode === "async") {
+      const session = args.client.session
+      if (typeof session?.promptAsync !== "function") {
+        return undefined
+      }
+      const dispatchPromptAsync = session.promptAsync.bind(session)
+      return (dispatchInput: TInput) => dispatchPromptAsync(dispatchInput)
+    }
+
+    const session = args.client.session
+    if (typeof session?.prompt !== "function") {
+      return undefined
+    }
+    const dispatchPrompt = session.prompt.bind(session)
+    return (dispatchInput: TInput) => dispatchPrompt(dispatchInput)
+  })()
 
   if (!dispatch) {
     log(`[prompt-async-gate] ${sessionName} unavailable`, { sessionID, source })