refactor: extract iMessage echo cache and unify suppression guards

src/agents/pi-embedded-subscribe.tools.ts

@@ -286,6 +286,14 @@ export function extractToolErrorMessage(result: unknown): string | undefined {
   return normalizeToolErrorText(text);
 }
 
+function resolveMessageToolTarget(args: Record<string, unknown>): string | undefined {
+  const toRaw = typeof args.to === "string" ? args.to : undefined;
+  if (toRaw) {
+    return toRaw;
+  }
+  return typeof args.target === "string" ? args.target : undefined;
+}
+
 export function extractMessagingToolSend(
   toolName: string,
   args: Record<string, unknown>,
@@ -298,12 +306,7 @@ export function extractMessagingToolSend(
     if (action !== "send" && action !== "thread-reply") {
       return undefined;
     }
-    const toRaw =
+    const toRaw = resolveMessageToolTarget(args);
-      typeof args.to === "string"
-        ? args.to
-        : typeof args.target === "string"
-          ? args.target
-          : undefined;
     if (!toRaw) {
       return undefined;
     }

src/auto-reply/reply/dispatch-from-config.ts

@@ -17,6 +17,7 @@ import type { GetReplyOptions, ReplyPayload } from "../types.js";
 import { formatAbortReplyText, tryFastAbortFromMessage } from "./abort.js";
 import { shouldSkipDuplicateInbound } from "./inbound-dedupe.js";
 import type { ReplyDispatcher, ReplyDispatchKind } from "./reply-dispatcher.js";
+import { shouldSuppressReasoningPayload } from "./reply-payloads.js";
 import { isRoutableChannel, routeReply } from "./route-reply.js";
 
 const AUDIO_PLACEHOLDER_RE = /^<media:audio>(\s*\([^)]*\))?$/i;
@@ -366,7 +367,7 @@ export async function dispatchReplyFromConfig(params: {
             // Suppress reasoning payloads — channels using this generic dispatch
             // path (WhatsApp, web, etc.) do not have a dedicated reasoning lane.
             // Telegram has its own dispatch path that handles reasoning splitting.
-            if (payload.isReasoning) {
+            if (shouldSuppressReasoningPayload(payload)) {
               return;
             }
             // Accumulate block text for TTS generation after streaming
@@ -404,7 +405,7 @@ export async function dispatchReplyFromConfig(params: {
     for (const reply of replies) {
       // Suppress reasoning payloads from channel delivery — channels using this
       // generic dispatch path do not have a dedicated reasoning lane.
-      if (reply.isReasoning) {
+      if (shouldSuppressReasoningPayload(reply)) {
         continue;
       }
       const ttsReply = await maybeApplyTtsToPayload({

src/auto-reply/reply/reply-payloads.ts

@@ -68,6 +68,10 @@ export function isRenderablePayload(payload: ReplyPayload): boolean {
   );
 }
 
+export function shouldSuppressReasoningPayload(payload: ReplyPayload): boolean {
+  return payload.isReasoning === true;
+}
+
 export function applyReplyThreading(params: {
   payloads: ReplyPayload[];
   replyToMode: ReplyToMode;

src/auto-reply/reply/route-reply.ts

@@ -15,6 +15,7 @@ import { INTERNAL_MESSAGE_CHANNEL, normalizeMessageChannel } from "../../utils/m
 import type { OriginatingChannelType } from "../templating.js";
 import type { ReplyPayload } from "../types.js";
 import { normalizeReplyPayload } from "./normalize-reply.js";
+import { shouldSuppressReasoningPayload } from "./reply-payloads.js";
 
 export type RouteReplyParams = {
   /** The reply payload to send. */
@@ -56,7 +57,7 @@ export type RouteReplyResult = {
  */
 export async function routeReply(params: RouteReplyParams): Promise<RouteReplyResult> {
   const { payload, channel, to, accountId, threadId, cfg, abortSignal } = params;
-  if (payload.isReasoning) {
+  if (shouldSuppressReasoningPayload(payload)) {
     return { ok: true };
   }
   const normalizedChannel = normalizeMessageChannel(channel);

src/imessage/monitor/deliver.ts

@@ -6,10 +6,7 @@ import { convertMarkdownTables } from "../../markdown/tables.js";
 import type { RuntimeEnv } from "../../runtime.js";
 import type { createIMessageRpcClient } from "../client.js";
 import { sendMessageIMessage } from "../send.js";
-
+import type { SentMessageCache } from "./echo-cache.js";
-type SentMessageCache = {
-  remember: (scope: string, lookup: { text?: string; messageId?: string }) => void;
-};
 
 export async function deliverReplies(params: {
   replies: ReplyPayload[];
@@ -19,7 +16,7 @@ export async function deliverReplies(params: {
   runtime: RuntimeEnv;
   maxBytes: number;
   textLimit: number;
-  sentMessageCache?: SentMessageCache;
+  sentMessageCache?: Pick<SentMessageCache, "remember">;
 }) {
   const { replies, target, client, runtime, maxBytes, textLimit, accountId, sentMessageCache } =
     params;

src/imessage/monitor/echo-cache.ts

@@ -0,0 +1,85 @@
+export type SentMessageLookup = {
+  text?: string;
+  messageId?: string;
+};
+
+export type SentMessageCache = {
+  remember: (scope: string, lookup: SentMessageLookup) => void;
+  has: (scope: string, lookup: SentMessageLookup) => boolean;
+};
+
+const SENT_MESSAGE_TEXT_TTL_MS = 5000;
+const SENT_MESSAGE_ID_TTL_MS = 60_000;
+
+function normalizeEchoTextKey(text: string | undefined): string | null {
+  if (!text) {
+    return null;
+  }
+  const normalized = text.replace(/\r\n?/g, "\n").trim();
+  return normalized ? normalized : null;
+}
+
+function normalizeEchoMessageIdKey(messageId: string | undefined): string | null {
+  if (!messageId) {
+    return null;
+  }
+  const normalized = messageId.trim();
+  if (!normalized || normalized === "ok" || normalized === "unknown") {
+    return null;
+  }
+  return normalized;
+}
+
+class DefaultSentMessageCache implements SentMessageCache {
+  private textCache = new Map<string, number>();
+  private messageIdCache = new Map<string, number>();
+
+  remember(scope: string, lookup: SentMessageLookup): void {
+    const textKey = normalizeEchoTextKey(lookup.text);
+    if (textKey) {
+      this.textCache.set(`${scope}:${textKey}`, Date.now());
+    }
+    const messageIdKey = normalizeEchoMessageIdKey(lookup.messageId);
+    if (messageIdKey) {
+      this.messageIdCache.set(`${scope}:${messageIdKey}`, Date.now());
+    }
+    this.cleanup();
+  }
+
+  has(scope: string, lookup: SentMessageLookup): boolean {
+    this.cleanup();
+    const messageIdKey = normalizeEchoMessageIdKey(lookup.messageId);
+    if (messageIdKey) {
+      const idTimestamp = this.messageIdCache.get(`${scope}:${messageIdKey}`);
+      if (idTimestamp && Date.now() - idTimestamp <= SENT_MESSAGE_ID_TTL_MS) {
+        return true;
+      }
+    }
+    const textKey = normalizeEchoTextKey(lookup.text);
+    if (textKey) {
+      const textTimestamp = this.textCache.get(`${scope}:${textKey}`);
+      if (textTimestamp && Date.now() - textTimestamp <= SENT_MESSAGE_TEXT_TTL_MS) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  private cleanup(): void {
+    const now = Date.now();
+    for (const [key, timestamp] of this.textCache.entries()) {
+      if (now - timestamp > SENT_MESSAGE_TEXT_TTL_MS) {
+        this.textCache.delete(key);
+      }
+    }
+    for (const [key, timestamp] of this.messageIdCache.entries()) {
+      if (now - timestamp > SENT_MESSAGE_ID_TTL_MS) {
+        this.messageIdCache.delete(key);
+      }
+    }
+  }
+}
+
+export function createSentMessageCache(): SentMessageCache {
+  return new DefaultSentMessageCache();
+}

src/imessage/monitor/monitor-provider.echo-cache.test.ts

@@ -1,5 +1,5 @@
 import { afterEach, describe, expect, it, vi } from "vitest";
-import { __testing } from "./monitor-provider.js";
+import { createSentMessageCache } from "./echo-cache.js";
 
 describe("iMessage sent-message echo cache", () => {
   afterEach(() => {
@@ -9,7 +9,7 @@ describe("iMessage sent-message echo cache", () => {
   it("matches recent text within the same scope", () => {
     vi.useFakeTimers();
     vi.setSystemTime(new Date("2026-02-25T00:00:00Z"));
-    const cache = __testing.createSentMessageCache();
+    const cache = createSentMessageCache();
 
     cache.remember("acct:imessage:+1555", { text: "  Reasoning:\r\n_step_  " });
 
@@ -20,7 +20,7 @@ describe("iMessage sent-message echo cache", () => {
   it("matches by outbound message id and ignores placeholder ids", () => {
     vi.useFakeTimers();
     vi.setSystemTime(new Date("2026-02-25T00:00:00Z"));
-    const cache = __testing.createSentMessageCache();
+    const cache = createSentMessageCache();
 
     cache.remember("acct:imessage:+1555", { messageId: "abc-123" });
     cache.remember("acct:imessage:+1555", { messageId: "ok" });
@@ -32,7 +32,7 @@ describe("iMessage sent-message echo cache", () => {
   it("keeps message-id lookups longer than text fallback", () => {
     vi.useFakeTimers();
     vi.setSystemTime(new Date("2026-02-25T00:00:00Z"));
-    const cache = __testing.createSentMessageCache();
+    const cache = createSentMessageCache();
 
     cache.remember("acct:imessage:+1555", { text: "hello", messageId: "m-1" });
     vi.advanceTimersByTime(6000);

src/imessage/monitor/monitor-provider.ts

@@ -44,6 +44,7 @@ import { probeIMessage } from "../probe.js";
 import { sendMessageIMessage } from "../send.js";
 import { attachIMessageMonitorAbortHandler } from "./abort-handler.js";
 import { deliverReplies } from "./deliver.js";
+import { createSentMessageCache } from "./echo-cache.js";
 import {
   buildIMessageInboundContext,
   resolveIMessageInboundDecision,
@@ -80,88 +81,6 @@ async function detectRemoteHostFromCliPath(cliPath: string): Promise<string | un
   }
 }
 
-/**
- * Cache for recently sent messages, used for echo detection.
- * Keys are scoped by conversation (accountId:target) so the same text in different chats is not conflated.
- * Message IDs use a longer TTL than text fallback to improve resilience when inbound polling is delayed.
- */
-const SENT_MESSAGE_TEXT_TTL_MS = 5000;
-const SENT_MESSAGE_ID_TTL_MS = 60_000;
-
-function normalizeEchoTextKey(text: string | undefined): string | null {
-  if (!text) {
-    return null;
-  }
-  const normalized = text.replace(/\r\n?/g, "\n").trim();
-  return normalized ? normalized : null;
-}
-
-function normalizeEchoMessageIdKey(messageId: string | undefined): string | null {
-  if (!messageId) {
-    return null;
-  }
-  const normalized = messageId.trim();
-  if (!normalized || normalized === "ok" || normalized === "unknown") {
-    return null;
-  }
-  return normalized;
-}
-
-type SentMessageLookup = {
-  text?: string;
-  messageId?: string;
-};
-
-class SentMessageCache {
-  private textCache = new Map<string, number>();
-  private messageIdCache = new Map<string, number>();
-
-  remember(scope: string, lookup: SentMessageLookup): void {
-    const textKey = normalizeEchoTextKey(lookup.text);
-    if (textKey) {
-      this.textCache.set(`${scope}:${textKey}`, Date.now());
-    }
-    const messageIdKey = normalizeEchoMessageIdKey(lookup.messageId);
-    if (messageIdKey) {
-      this.messageIdCache.set(`${scope}:${messageIdKey}`, Date.now());
-    }
-    this.cleanup();
-  }
-
-  has(scope: string, lookup: SentMessageLookup): boolean {
-    this.cleanup();
-    const messageIdKey = normalizeEchoMessageIdKey(lookup.messageId);
-    if (messageIdKey) {
-      const idTimestamp = this.messageIdCache.get(`${scope}:${messageIdKey}`);
-      if (idTimestamp && Date.now() - idTimestamp <= SENT_MESSAGE_ID_TTL_MS) {
-        return true;
-      }
-    }
-    const textKey = normalizeEchoTextKey(lookup.text);
-    if (textKey) {
-      const textTimestamp = this.textCache.get(`${scope}:${textKey}`);
-      if (textTimestamp && Date.now() - textTimestamp <= SENT_MESSAGE_TEXT_TTL_MS) {
-        return true;
-      }
-    }
-    return false;
-  }
-
-  private cleanup(): void {
-    const now = Date.now();
-    for (const [key, timestamp] of this.textCache.entries()) {
-      if (now - timestamp > SENT_MESSAGE_TEXT_TTL_MS) {
-        this.textCache.delete(key);
-      }
-    }
-    for (const [key, timestamp] of this.messageIdCache.entries()) {
-      if (now - timestamp > SENT_MESSAGE_ID_TTL_MS) {
-        this.messageIdCache.delete(key);
-      }
-    }
-  }
-}
-
 export async function monitorIMessageProvider(opts: MonitorIMessageOpts = {}): Promise<void> {
   const runtime = resolveRuntime(opts);
   const cfg = opts.config ?? loadConfig();
@@ -177,7 +96,7 @@ export async function monitorIMessageProvider(opts: MonitorIMessageOpts = {}): P
       DEFAULT_GROUP_HISTORY_LIMIT,
   );
   const groupHistories = new Map<string, HistoryEntry[]>();
-  const sentMessageCache = new SentMessageCache();
+  const sentMessageCache = createSentMessageCache();
   const textLimit = resolveTextChunkLimit(cfg, "imessage", accountInfo.accountId);
   const allowFrom = normalizeAllowList(opts.allowFrom ?? imessageCfg.allowFrom);
   const groupAllowFrom = normalizeAllowList(
@@ -564,5 +483,4 @@ export async function monitorIMessageProvider(opts: MonitorIMessageOpts = {}): P
 export const __testing = {
   resolveIMessageRuntimeGroupPolicy: resolveOpenProviderRuntimeGroupPolicy,
   resolveDefaultGroupPolicy,
-  createSentMessageCache: () => new SentMessageCache(),
 };

src/infra/outbound/payloads.ts

@@ -1,5 +1,8 @@
 import { parseReplyDirectives } from "../../auto-reply/reply/reply-directives.js";
-import { isRenderablePayload } from "../../auto-reply/reply/reply-payloads.js";
+import {
+  isRenderablePayload,
+  shouldSuppressReasoningPayload,
+} from "../../auto-reply/reply/reply-payloads.js";
 import type { ReplyPayload } from "../../auto-reply/types.js";
 
 export type NormalizedOutboundPayload = {
@@ -41,7 +44,7 @@ export function normalizeReplyPayloadsForDelivery(
   payloads: readonly ReplyPayload[],
 ): ReplyPayload[] {
   return payloads.flatMap((payload) => {
-    if (payload.isReasoning) {
+    if (shouldSuppressReasoningPayload(payload)) {
       return [];
     }
     const parsed = parseReplyDirectives(payload.text ?? "");