refactor(channels): share reset message construction across adapters

docs/plans/analysis/2026-02-16-codebase-audit-report.md

@@ -268,6 +268,7 @@ Remediation update (2026-02-16):
 
 Remediation update (2026-02-16):
 - Added shared `normalizeResetCommandText()` utility and migrated Discord/Slack/WhatsApp adapters to use it, reducing repeated reset-command parsing logic.
+- Added shared `buildResetInboundMessage()` utility and migrated Discord/Slack/WhatsApp adapters to use it, reducing repeated reset-metadata construction logic.
 
 ### F-014 Low: ModelRouter listener API has destructive setter footgun
 

docs/plans/state.json

@@ -2618,7 +2618,7 @@
       "status": "in_progress",
       "date": "2026-02-16",
       "updated": "2026-02-16",
-      "summary": "Started reducing channel adapter duplication by extracting shared reset-command normalization and migrating Discord/Slack/WhatsApp adapters to use it.",
+      "summary": "Started reducing channel adapter duplication by extracting shared reset-command normalization and reset message construction utilities, and migrating Discord/Slack/WhatsApp adapters to use them.",
       "files_modified": [
         "src/channels/utils.ts",
         "src/channels/utils.test.ts",
@@ -2627,7 +2627,7 @@
         "src/channels/whatsapp/adapter.ts",
         "docs/plans/analysis/2026-02-16-codebase-audit-report.md"
       ],
-      "test_status": "pnpm test:run src/channels/utils.test.ts src/channels/discord/adapter.test.ts src/channels/slack/adapter.test.ts src/channels/whatsapp/adapter.test.ts + pnpm typecheck passing"
+      "test_status": "pnpm test:run src/channels/utils.test.ts src/channels/discord/adapter.test.ts src/channels/slack/adapter.test.ts src/channels/whatsapp/adapter.test.ts + pnpm typecheck + pnpm lint passing"
     },
     "audit-followup-lint-error-baseline": {
       "status": "completed",

src/channels/discord/adapter.ts

@@ -17,7 +17,7 @@ import type {
   ChannelAdapter,
   ChannelStatus,
 } from '../types.js';
-import { normalizeResetCommandText, splitMessage } from '../utils.js';
+import { buildResetInboundMessage, normalizeResetCommandText, splitMessage } from '../utils.js';
 import type { PairingManager } from '../pairing.js';
 
 /** Configuration for the Discord channel adapter. */
@@ -242,15 +242,12 @@ export class DiscordAdapter implements ChannelAdapter {
 
     // ── Reset command ──
     if (text === '!reset') {
-      this.messageHandler({
+      this.messageHandler(buildResetInboundMessage({
         id: message.id,
         channel: 'discord',
         senderId: message.channelId,
         senderName: message.author.username,
-        text: '!reset',
-        timestamp: Date.now(),
-        metadata: { isCommand: true, command: 'reset' },
-      });
+      }));
       return;
     }
 

src/channels/slack/adapter.ts

@@ -15,7 +15,7 @@ import type {
   ChannelAdapter,
   ChannelStatus,
 } from '../types.js';
-import { normalizeResetCommandText, splitMessage } from '../utils.js';
+import { buildResetInboundMessage, normalizeResetCommandText, splitMessage } from '../utils.js';
 import type { PairingManager } from '../pairing.js';
 
 /** Configuration for the Slack channel adapter. */
@@ -357,16 +357,13 @@ export class SlackAdapter implements ChannelAdapter {
 
     // Detect reset command
     if (text === '!reset') {
-      this.messageHandler({
+      this.messageHandler(buildResetInboundMessage({
         id: message.ts ?? '',
         channel: 'slack',
         senderId: peerId,
         senderName,
-        text: '!reset',
-        timestamp: Date.now(),
-        metadata: { isCommand: true, command: 'reset' },
-        ...(attachments.length > 0 && { attachments }),
-      });
+        attachments,
+      }));
       return;
     }
 

src/channels/utils.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest';
-import { normalizeResetCommandText, splitMessage } from './utils.js';
+import { buildResetInboundMessage, normalizeResetCommandText, splitMessage } from './utils.js';
 
 describe('splitMessage', () => {
   it('returns single chunk for empty string', () => {
@@ -98,3 +98,38 @@ describe('normalizeResetCommandText', () => {
     expect(normalizeResetCommandText('hello')).toBe('hello');
   });
 });
+
+describe('buildResetInboundMessage', () => {
+  it('builds canonical reset command metadata and text', () => {
+    const message = buildResetInboundMessage({
+      id: 'id-1',
+      channel: 'slack',
+      senderId: 'C1:T1',
+      senderName: 'Alice',
+      timestamp: 123,
+    });
+
+    expect(message).toEqual({
+      id: 'id-1',
+      channel: 'slack',
+      senderId: 'C1:T1',
+      senderName: 'Alice',
+      text: '!reset',
+      timestamp: 123,
+      metadata: { isCommand: true, command: 'reset' },
+    });
+  });
+
+  it('includes attachments only when provided', () => {
+    const message = buildResetInboundMessage({
+      id: 'id-2',
+      channel: 'whatsapp',
+      senderId: '123@c.us',
+      attachments: [{ mimeType: 'image/png', url: 'https://example.com/a.png' }],
+    });
+
+    expect(message.attachments).toHaveLength(1);
+    expect(message.text).toBe('!reset');
+    expect(message.metadata).toEqual({ isCommand: true, command: 'reset' });
+  });
+});

src/channels/utils.ts

@@ -1,6 +1,7 @@
 /**
  * Shared utilities for channel adapters.
  */
+import type { Attachment, InboundMessage } from './types.js';
 
 /**
  * Split a long message into chunks that respect a platform's character limit.
@@ -42,3 +43,26 @@ export function normalizeResetCommandText(text: string): string {
   }
   return text;
 }
+
+interface ResetMessageParams {
+  id: string;
+  channel: InboundMessage['channel'];
+  senderId: string;
+  senderName?: string;
+  timestamp?: number;
+  attachments?: Attachment[];
+}
+
+/** Build a normalized inbound reset command message. */
+export function buildResetInboundMessage(params: ResetMessageParams): InboundMessage {
+  return {
+    id: params.id,
+    channel: params.channel,
+    senderId: params.senderId,
+    senderName: params.senderName,
+    text: '!reset',
+    timestamp: params.timestamp ?? Date.now(),
+    metadata: { isCommand: true, command: 'reset' },
+    ...(params.attachments && params.attachments.length > 0 ? { attachments: params.attachments } : {}),
+  };
+}

src/channels/whatsapp/adapter.ts

@@ -17,7 +17,7 @@ import type {
   ChannelAdapter,
   ChannelStatus,
 } from '../types.js';
-import { normalizeResetCommandText, splitMessage } from '../utils.js';
+import { buildResetInboundMessage, normalizeResetCommandText, splitMessage } from '../utils.js';
 import type { PairingManager } from '../pairing.js';
 
 /** Configuration for the WhatsApp channel adapter. */
@@ -313,16 +313,13 @@ export class WhatsAppAdapter implements ChannelAdapter {
 
     // Detect reset command
     if (text === '!reset') {
-      this.messageHandler({
+      this.messageHandler(buildResetInboundMessage({
         id: message.id.id,
         channel: 'whatsapp',
         senderId: from,
         senderName,
-        text: '!reset',
-        timestamp: Date.now(),
-        metadata: { isCommand: true, command: 'reset' },
-        ...(attachments.length > 0 ? { attachments } : {}),
-      });
+        attachments,
+      }));
       return;
     }