fix: unify inbound sender labels

CHANGELOG.md

@@ -36,6 +36,7 @@
 - Gateway: honor explicit delivery targets without implicit accountId fallback; preserve lastAccountId for implicit routing.
 - Repo: fix oxlint config filename and move ignore pattern into config. (#1064) — thanks @connorshea.
 - Messages: `/stop` now hard-aborts queued followups and sub-agent runs; suppress zero-count stop notes.
+- Messages: include sender labels for live group messages across channels, matching queued/history formatting. (#1059)
 - Sessions: reset `compactionCount` on `/new` and `/reset`, and preserve `sessions.json` file mode (0600).
 - Sessions: repair orphaned user turns before embedded prompts.
 - Channels: treat replies to the bot as implicit mentions across supported channels.

docs/concepts/messages.md

@@ -85,6 +85,10 @@ When a channel supplies history, it uses a shared wrapper:
 - `[Chat messages since your last reply - for context]`
 - `[Current message - respond to this]`
 
+For **non-direct chats** (groups/channels/rooms), the **current message body** is prefixed with the
+sender label (same style used for history entries). This keeps real-time and queued/history
+messages consistent in the agent prompt.
+
 History buffers are **pending-only**: they include group messages that did *not*
 trigger a run (for example, mention-gated messages) and **exclude** messages
 already in the session transcript.

src/auto-reply/envelope.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from "vitest";
 
-import { formatAgentEnvelope } from "./envelope.js";
+import { formatAgentEnvelope, formatInboundEnvelope } from "./envelope.js";
 
 describe("formatAgentEnvelope", () => {
   it("includes channel, from, ip, host, and timestamp", () => {
@@ -43,3 +43,38 @@ describe("formatAgentEnvelope", () => {
     expect(body).toBe("[Telegram] hi");
   });
 });
+
+describe("formatInboundEnvelope", () => {
+  it("prefixes sender for non-direct chats", () => {
+    const body = formatInboundEnvelope({
+      channel: "Discord",
+      from: "Guild #general",
+      body: "hi",
+      chatType: "channel",
+      senderLabel: "Alice",
+    });
+    expect(body).toBe("[Discord Guild #general] Alice: hi");
+  });
+
+  it("uses sender fields when senderLabel is missing", () => {
+    const body = formatInboundEnvelope({
+      channel: "Signal",
+      from: "Signal Group id:123",
+      body: "ping",
+      chatType: "group",
+      sender: { name: "Bob", id: "42" },
+    });
+    expect(body).toBe("[Signal Signal Group id:123] Bob (42): ping");
+  });
+
+  it("keeps direct messages unprefixed", () => {
+    const body = formatInboundEnvelope({
+      channel: "iMessage",
+      from: "+1555",
+      body: "hello",
+      chatType: "direct",
+      senderLabel: "Alice",
+    });
+    expect(body).toBe("[iMessage +1555] hello");
+  });
+});

src/auto-reply/envelope.ts

@@ -1,3 +1,6 @@
+import { normalizeChatType } from "../channels/chat-type.js";
+import { resolveSenderLabel, type SenderLabelParams } from "../channels/sender-label.js";
+
 export type AgentEnvelopeParams = {
   channel: string;
   from?: string;
@@ -35,6 +38,27 @@ export function formatAgentEnvelope(params: AgentEnvelopeParams): string {
   return `${header} ${params.body}`;
 }
 
+export function formatInboundEnvelope(params: {
+  channel: string;
+  from: string;
+  body: string;
+  timestamp?: number | Date;
+  chatType?: string;
+  senderLabel?: string;
+  sender?: SenderLabelParams;
+}): string {
+  const chatType = normalizeChatType(params.chatType);
+  const isDirect = !chatType || chatType === "direct";
+  const resolvedSender = params.senderLabel?.trim() || resolveSenderLabel(params.sender ?? {});
+  const body = !isDirect && resolvedSender ? `${resolvedSender}: ${params.body}` : params.body;
+  return formatAgentEnvelope({
+    channel: params.channel,
+    from: params.from,
+    timestamp: params.timestamp,
+    body,
+  });
+}
+
 export function formatThreadStarterEnvelope(params: {
   channel: string;
   author?: string;

src/auto-reply/reply/inbound-sender-meta.test.ts

@@ -41,4 +41,11 @@ describe("formatInboundBodyWithSenderMeta", () => {
       "[X] hi\n[from: Alice (A1)]",
     );
   });
+
+  it("does not append when the body already includes a sender prefix", () => {
+    const ctx: MsgContext = { ChatType: "group", SenderName: "Alice", SenderId: "A1" };
+    expect(formatInboundBodyWithSenderMeta({ ctx, body: "Alice (A1): hi" })).toBe(
+      "Alice (A1): hi",
+    );
+  });
 });

src/auto-reply/reply/inbound-sender-meta.ts

@@ -1,28 +1,43 @@
 import type { MsgContext } from "../templating.js";
 import { normalizeChatType } from "../../channels/chat-type.js";
+import { listSenderLabelCandidates, resolveSenderLabel } from "../../channels/sender-label.js";
 
 export function formatInboundBodyWithSenderMeta(params: { body: string; ctx: MsgContext }): string {
   const body = params.body;
   if (!body.trim()) return body;
   const chatType = normalizeChatType(params.ctx.ChatType);
   if (!chatType || chatType === "direct") return body;
-  if (hasSenderMetaLine(body)) return body;
+  if (hasSenderMetaLine(body, params.ctx)) return body;
 
-  const senderLabel = formatSenderLabel(params.ctx);
+  const senderLabel = resolveSenderLabel({
+    name: params.ctx.SenderName,
+    username: params.ctx.SenderUsername,
+    tag: params.ctx.SenderTag,
+    e164: params.ctx.SenderE164,
+    id: params.ctx.SenderId,
+  });
   if (!senderLabel) return body;
 
   return `${body}\n[from: ${senderLabel}]`;
 }
 
-function hasSenderMetaLine(body: string): boolean {
+function hasSenderMetaLine(body: string, ctx: MsgContext): boolean {
-  return /(^|\n)\[from:/i.test(body);
+  if (/(^|\n)\[from:/i.test(body)) return true;
+  const candidates = listSenderLabelCandidates({
+    name: ctx.SenderName,
+    username: ctx.SenderUsername,
+    tag: ctx.SenderTag,
+    e164: ctx.SenderE164,
+    id: ctx.SenderId,
+  });
+  if (candidates.length === 0) return false;
+  return candidates.some((candidate) => {
+    const escaped = escapeRegExp(candidate);
+    const pattern = new RegExp(`(^|\\n)${escaped}:\\s`, "i");
+    return pattern.test(body);
+  });
 }
 
-function formatSenderLabel(ctx: MsgContext): string | null {
+function escapeRegExp(value: string): string {
-  const senderName = ctx.SenderName?.trim();
+  return value.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
-  const senderId = (ctx.SenderE164?.trim() || ctx.SenderId?.trim()) ?? "";
-  if (senderName && senderId && senderName !== senderId) {
-    return `${senderName} (${senderId})`;
-  }
-  return senderName ?? (senderId || null);
 }

src/channels/sender-label.ts

@@ -0,0 +1,43 @@
+export type SenderLabelParams = {
+  name?: string;
+  username?: string;
+  tag?: string;
+  e164?: string;
+  id?: string;
+};
+
+function normalize(value?: string): string | undefined {
+  const trimmed = value?.trim();
+  return trimmed ? trimmed : undefined;
+}
+
+export function resolveSenderLabel(params: SenderLabelParams): string | null {
+  const name = normalize(params.name);
+  const username = normalize(params.username);
+  const tag = normalize(params.tag);
+  const e164 = normalize(params.e164);
+  const id = normalize(params.id);
+
+  const display = name ?? username ?? tag ?? "";
+  const idPart = e164 ?? id ?? "";
+  if (display && idPart && display !== idPart) return `${display} (${idPart})`;
+  return display || idPart || null;
+}
+
+export function listSenderLabelCandidates(params: SenderLabelParams): string[] {
+  const candidates = new Set<string>();
+  const name = normalize(params.name);
+  const username = normalize(params.username);
+  const tag = normalize(params.tag);
+  const e164 = normalize(params.e164);
+  const id = normalize(params.id);
+
+  if (name) candidates.add(name);
+  if (username) candidates.add(username);
+  if (tag) candidates.add(tag);
+  if (e164) candidates.add(e164);
+  if (id) candidates.add(id);
+  const resolved = resolveSenderLabel(params);
+  if (resolved) candidates.add(resolved);
+  return Array.from(candidates);
+}

src/discord/monitor.tool-result.sends-status-replies-responseprefix.test.ts

@@ -369,6 +369,97 @@ describe("discord tool result dispatch", () => {
     expect(capturedCtx?.SessionKey).toBe("agent:main:discord:channel:c1");
   });
 
+  it("prefixes group bodies with sender label", async () => {
+    const { createDiscordMessageHandler } = await import("./monitor.js");
+    let capturedBody = "";
+    dispatchMock.mockImplementationOnce(async ({ ctx, dispatcher }) => {
+      capturedBody = ctx.Body ?? "";
+      dispatcher.sendFinalReply({ text: "ok" });
+      return { queuedFinal: true, counts: { final: 1 } };
+    });
+
+    const cfg = {
+      agents: {
+        defaults: {
+          model: "anthropic/claude-opus-4-5",
+          workspace: "/tmp/clawd",
+        },
+      },
+      session: { store: "/tmp/clawdbot-sessions.json" },
+      channels: {
+        discord: {
+          dm: { enabled: true, policy: "open" },
+          guilds: {
+            "*": {
+              requireMention: false,
+              channels: { c1: { allow: true } },
+            },
+          },
+        },
+      },
+      routing: { allowFrom: [] },
+    } as ReturnType<typeof import("../config/config.js").loadConfig>;
+
+    const handler = createDiscordMessageHandler({
+      cfg,
+      discordConfig: cfg.channels.discord,
+      accountId: "default",
+      token: "token",
+      runtime: {
+        log: vi.fn(),
+        error: vi.fn(),
+        exit: (code: number): never => {
+          throw new Error(`exit ${code}`);
+        },
+      },
+      botUserId: "bot-id",
+      guildHistories: new Map(),
+      historyLimit: 0,
+      mediaMaxBytes: 10_000,
+      textLimit: 2000,
+      replyToMode: "off",
+      dmEnabled: true,
+      groupDmEnabled: false,
+      guildEntries: {
+        "*": { requireMention: false, channels: { c1: { allow: true } } },
+      },
+    });
+
+    const client = {
+      fetchChannel: vi.fn().mockResolvedValue({
+        type: ChannelType.GuildText,
+        name: "general",
+        parentId: "category-1",
+      }),
+      rest: { get: vi.fn() },
+    } as unknown as Client;
+
+    await handler(
+      {
+        message: {
+          id: "m-prefix",
+          content: "hello",
+          channelId: "c1",
+          timestamp: new Date("2026-01-17T00:00:00Z").toISOString(),
+          type: MessageType.Default,
+          attachments: [],
+          embeds: [],
+          mentionedEveryone: false,
+          mentionedUsers: [],
+          mentionedRoles: [],
+          author: { id: "u1", bot: false, username: "Ada", discriminator: "1234" },
+        },
+        author: { id: "u1", bot: false, username: "Ada", discriminator: "1234" },
+        member: { displayName: "Ada" },
+        guild: { id: "g1", name: "Guild" },
+        guild_id: "g1",
+      },
+      client,
+    );
+
+    expect(capturedBody).toContain("Ada (Ada#1234): hello");
+  });
+
   it("replies with pairing code and sender id when dmPolicy is pairing", async () => {
     const { createDiscordMessageHandler } = await import("./monitor.js");
     const cfg = {

src/discord/monitor/message-handler.process.ts

@@ -8,7 +8,10 @@ import {
   extractShortModelName,
   type ResponsePrefixContext,
 } from "../../auto-reply/reply/response-prefix-template.js";
-import { formatAgentEnvelope, formatThreadStarterEnvelope } from "../../auto-reply/envelope.js";
+import {
+  formatInboundEnvelope,
+  formatThreadStarterEnvelope,
+} from "../../auto-reply/envelope.js";
 import { dispatchReplyFromConfig } from "../../auto-reply/reply/dispatch-from-config.js";
 import {
   buildPendingHistoryContextFromMap,
@@ -118,6 +121,12 @@ export async function processDiscordMessage(ctx: DiscordMessagePreflightContext)
         channelName: channelName ?? message.channelId,
         channelId: message.channelId,
       });
+  const senderTag = formatDiscordUserTag(author);
+  const senderDisplay = data.member?.nickname ?? author.globalName ?? author.username;
+  const senderLabel =
+    senderDisplay && senderTag && senderDisplay !== senderTag
+      ? `${senderDisplay} (${senderTag})`
+      : senderDisplay ?? senderTag ?? author.id;
   const groupRoom = isGuildMessage && displayChannelSlug ? `#${displayChannelSlug}` : undefined;
   const groupSubject = isDirectMessage ? undefined : groupRoom;
   const channelDescription = channelInfo?.topic?.trim();
@@ -127,11 +136,13 @@ export async function processDiscordMessage(ctx: DiscordMessagePreflightContext)
   ].filter((entry): entry is string => Boolean(entry));
   const groupSystemPrompt =
     systemPromptParts.length > 0 ? systemPromptParts.join("\n\n") : undefined;
-  let combinedBody = formatAgentEnvelope({
+  let combinedBody = formatInboundEnvelope({
     channel: "Discord",
     from: fromLabel,
     timestamp: resolveTimestampMs(message.timestamp),
     body: text,
+    chatType: isDirectMessage ? "direct" : "channel",
+    senderLabel,
   });
   const shouldIncludeChannelHistory =
     !isDirectMessage && !(isGuildMessage && channelConfig?.autoThread && !threadChannel);
@@ -142,11 +153,13 @@ export async function processDiscordMessage(ctx: DiscordMessagePreflightContext)
       limit: historyLimit,
       currentMessage: combinedBody,
       formatEntry: (entry) =>
-        formatAgentEnvelope({
+        formatInboundEnvelope({
           channel: "Discord",
           from: fromLabel,
           timestamp: entry.timestamp,
-          body: `${entry.sender}: ${entry.body} [id:${entry.messageId ?? "unknown"} channel:${message.channelId}]`,
+          body: `${entry.body} [id:${entry.messageId ?? "unknown"} channel:${message.channelId}]`,
+          chatType: "channel",
+          senderLabel: entry.sender,
         }),
     });
   }

src/imessage/monitor.skips-group-messages-without-mention-by-default.test.ts

@@ -461,4 +461,35 @@ describe("monitorIMessageProvider", () => {
 
     expect(replyMock).not.toHaveBeenCalled();
   });
+
+  it("prefixes group message bodies with sender", async () => {
+    const run = monitorIMessageProvider();
+    await waitForSubscribe();
+
+    notificationHandler?.({
+      method: "message",
+      params: {
+        message: {
+          id: 11,
+          chat_id: 99,
+          chat_name: "Test Group",
+          sender: "+15550001111",
+          is_from_me: false,
+          text: "@clawd hi",
+          is_group: true,
+          created_at: "2026-01-17T00:00:00Z",
+        },
+      },
+    });
+
+    await flush();
+    closeResolve?.();
+    await run;
+
+    expect(replyMock).toHaveBeenCalled();
+    const ctx = replyMock.mock.calls[0]?.[0];
+    const body = ctx?.Body ?? "";
+    expect(body).toContain("Test Group id:99");
+    expect(body).toContain("+15550001111: @clawd hi");
+  });
 });

src/imessage/monitor/monitor-provider.ts

@@ -11,7 +11,7 @@ import {
 } from "../../auto-reply/reply/response-prefix-template.js";
 import { resolveTextChunkLimit } from "../../auto-reply/chunk.js";
 import { hasControlCommand } from "../../auto-reply/command-detection.js";
-import { formatAgentEnvelope } from "../../auto-reply/envelope.js";
+import { formatInboundEnvelope } from "../../auto-reply/envelope.js";
 import {
   createInboundDebouncer,
   resolveInboundDebounceMs,
@@ -363,11 +363,13 @@ export async function monitorIMessageProvider(opts: MonitorIMessageOpts = {}): P
     const fromLabel = isGroup
       ? `${message.chat_name || "iMessage Group"} id:${chatId ?? "unknown"}`
       : `${senderNormalized} id:${sender}`;
-    const body = formatAgentEnvelope({
+    const body = formatInboundEnvelope({
       channel: "iMessage",
       from: fromLabel,
       timestamp: createdAt,
       body: bodyText,
+      chatType: isGroup ? "group" : "direct",
+      sender: { name: senderNormalized, id: sender },
     });
     let combinedBody = body;
     if (isGroup && historyKey && historyLimit > 0) {
@@ -377,13 +379,13 @@ export async function monitorIMessageProvider(opts: MonitorIMessageOpts = {}): P
         limit: historyLimit,
         currentMessage: combinedBody,
         formatEntry: (entry) =>
-          formatAgentEnvelope({
+          formatInboundEnvelope({
             channel: "iMessage",
             from: fromLabel,
             timestamp: entry.timestamp,
-            body: `${entry.sender}: ${entry.body}${
+            body: `${entry.body}${entry.messageId ? ` [id:${entry.messageId}]` : ""}`,
-              entry.messageId ? ` [id:${entry.messageId}]` : ""
+            chatType: "group",
-            }`,
+            senderLabel: entry.sender,
           }),
       });
     }

src/signal/monitor.event-handler.sender-prefix.test.ts

@@ -0,0 +1,87 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+
+const dispatchMock = vi.fn();
+const readAllowFromMock = vi.fn();
+
+vi.mock("../pairing/pairing-store.js", () => ({
+  readChannelAllowFromStore: (...args: unknown[]) => readAllowFromMock(...args),
+  upsertChannelPairingRequest: vi.fn(),
+}));
+
+
+describe("signal event handler sender prefix", () => {
+  beforeEach(() => {
+    dispatchMock.mockReset().mockImplementation(async ({ dispatcher, ctx }) => {
+      dispatcher.sendFinalReply({ text: "ok" });
+      return { queuedFinal: true, counts: { final: 1 }, ctx };
+    });
+    readAllowFromMock.mockReset().mockResolvedValue([]);
+  });
+
+  it("prefixes group bodies with sender label", async () => {
+    let capturedBody = "";
+    const dispatchModule = await import("../auto-reply/reply/dispatch-from-config.js");
+    vi.spyOn(dispatchModule, "dispatchReplyFromConfig").mockImplementation(
+      async (...args: unknown[]) => dispatchMock(...args),
+    );
+    dispatchMock.mockImplementationOnce(async ({ dispatcher, ctx }) => {
+      capturedBody = ctx.Body ?? "";
+      dispatcher.sendFinalReply({ text: "ok" });
+      return { queuedFinal: true, counts: { final: 1 } };
+    });
+
+    const { createSignalEventHandler } = await import("./monitor/event-handler.js");
+    const handler = createSignalEventHandler({
+      runtime: {
+        log: vi.fn(),
+        error: vi.fn(),
+        exit: (code: number): never => {
+          throw new Error(`exit ${code}`);
+        },
+      },
+      cfg: {
+        agents: { defaults: { model: "anthropic/claude-opus-4-5", workspace: "/tmp/clawd" } },
+        channels: { signal: {} },
+      } as never,
+      baseUrl: "http://localhost",
+      account: "+15550009999",
+      accountId: "default",
+      blockStreaming: false,
+      historyLimit: 0,
+      groupHistories: new Map(),
+      textLimit: 4000,
+      dmPolicy: "open",
+      allowFrom: [],
+      groupAllowFrom: [],
+      groupPolicy: "open",
+      reactionMode: "off",
+      reactionAllowlist: [],
+      mediaMaxBytes: 1000,
+      ignoreAttachments: true,
+      fetchAttachment: async () => null,
+      deliverReplies: async () => undefined,
+      resolveSignalReactionTargets: () => [],
+      isSignalReactionMessage: () => false,
+      shouldEmitSignalReactionNotification: () => false,
+      buildSignalReactionSystemEventText: () => "",
+    });
+
+    const payload = {
+      envelope: {
+        sourceNumber: "+15550002222",
+        sourceName: "Alice",
+        timestamp: 1700000000000,
+        dataMessage: {
+          message: "hello",
+          groupInfo: { groupId: "group-1", groupName: "Test Group" },
+        },
+      },
+    };
+
+    await handler({ event: "receive", data: JSON.stringify(payload) });
+
+    expect(dispatchMock).toHaveBeenCalled();
+    expect(capturedBody).toContain("Alice (+15550002222): hello");
+  });
+});

src/signal/monitor/event-handler.ts

@@ -8,7 +8,7 @@ import {
   type ResponsePrefixContext,
 } from "../../auto-reply/reply/response-prefix-template.js";
 import { hasControlCommand } from "../../auto-reply/command-detection.js";
-import { formatAgentEnvelope } from "../../auto-reply/envelope.js";
+import { formatInboundEnvelope } from "../../auto-reply/envelope.js";
 import {
   createInboundDebouncer,
   resolveInboundDebounceMs,
@@ -68,11 +68,13 @@ export function createSignalEventHandler(deps: SignalEventHandlerDeps) {
     const fromLabel = entry.isGroup
       ? `${entry.groupName ?? "Signal Group"} id:${entry.groupId}`
       : `${entry.senderName} id:${entry.senderDisplay}`;
-    const body = formatAgentEnvelope({
+    const body = formatInboundEnvelope({
       channel: "Signal",
       from: fromLabel,
       timestamp: entry.timestamp ?? undefined,
       body: entry.bodyText,
+      chatType: entry.isGroup ? "group" : "direct",
+      sender: { name: entry.senderName, id: entry.senderDisplay },
     });
     let combinedBody = body;
     const historyKey = entry.isGroup ? String(entry.groupId ?? "unknown") : undefined;
@@ -83,13 +85,15 @@ export function createSignalEventHandler(deps: SignalEventHandlerDeps) {
         limit: deps.historyLimit,
         currentMessage: combinedBody,
         formatEntry: (historyEntry) =>
-          formatAgentEnvelope({
+          formatInboundEnvelope({
             channel: "Signal",
             from: fromLabel,
             timestamp: historyEntry.timestamp,
-            body: `${historyEntry.sender}: ${historyEntry.body}${
+            body: `${historyEntry.body}${
               historyEntry.messageId ? ` [id:${historyEntry.messageId}]` : ""
             }`,
+            chatType: "group",
+            senderLabel: historyEntry.sender,
           }),
       });
     }

src/slack/monitor/message-handler/prepare.sender-prefix.test.ts

@@ -0,0 +1,80 @@
+import { describe, expect, it, vi } from "vitest";
+
+import type { SlackMonitorContext } from "../context.js";
+import { prepareSlackMessage } from "./prepare.js";
+
+describe("prepareSlackMessage sender prefix", () => {
+  it("prefixes channel bodies with sender label", async () => {
+    const ctx = {
+      cfg: {
+        agents: { defaults: { model: "anthropic/claude-opus-4-5", workspace: "/tmp/clawd" } },
+        channels: { slack: {} },
+      },
+      accountId: "default",
+      botToken: "xoxb",
+      app: { client: {} },
+      runtime: {
+        log: vi.fn(),
+        error: vi.fn(),
+        exit: (code: number): never => {
+          throw new Error(`exit ${code}`);
+        },
+      },
+      botUserId: "BOT",
+      teamId: "T1",
+      apiAppId: "A1",
+      historyLimit: 0,
+      channelHistories: new Map(),
+      sessionScope: "per-sender",
+      mainKey: "agent:main:main",
+      dmEnabled: true,
+      dmPolicy: "open",
+      allowFrom: [],
+      groupDmEnabled: false,
+      groupDmChannels: [],
+      defaultRequireMention: true,
+      groupPolicy: "open",
+      useAccessGroups: false,
+      reactionMode: "off",
+      reactionAllowlist: [],
+      replyToMode: "off",
+      threadHistoryScope: "channel",
+      threadInheritParent: false,
+      slashCommand: { command: "/clawd", enabled: true },
+      textLimit: 2000,
+      ackReactionScope: "off",
+      mediaMaxBytes: 1000,
+      removeAckAfterReply: false,
+      logger: { info: vi.fn() },
+      markMessageSeen: () => false,
+      shouldDropMismatchedSlackEvent: () => false,
+      resolveSlackSystemEventSessionKey: () => "agent:main:slack:channel:C1",
+      isChannelAllowed: () => true,
+      resolveChannelName: async () => ({
+        name: "general",
+        type: "channel",
+      }),
+      resolveUserName: async () => ({ name: "Alice" }),
+      setSlackThreadStatus: async () => undefined,
+    } satisfies SlackMonitorContext;
+
+    const result = await prepareSlackMessage({
+      ctx,
+      account: { accountId: "default", config: {} } as never,
+      message: {
+        type: "message",
+        channel: "C1",
+        channel_type: "channel",
+        text: "<@BOT> hello",
+        user: "U1",
+        ts: "1700000000.0001",
+        event_ts: "1700000000.0001",
+      } as never,
+      opts: { source: "message", wasMentioned: true },
+    });
+
+    expect(result).not.toBeNull();
+    const body = result?.ctxPayload.Body ?? "";
+    expect(body).toContain("Alice (U1): <@BOT> hello");
+  });
+});

src/slack/monitor/message-handler/prepare.ts

@@ -1,7 +1,10 @@
 import { resolveAckReaction } from "../../../agents/identity.js";
 import { hasControlCommand } from "../../../auto-reply/command-detection.js";
 import { shouldHandleTextCommands } from "../../../auto-reply/commands-registry.js";
-import { formatAgentEnvelope, formatThreadStarterEnvelope } from "../../../auto-reply/envelope.js";
+import {
+  formatInboundEnvelope,
+  formatThreadStarterEnvelope,
+} from "../../../auto-reply/envelope.js";
 import {
   buildPendingHistoryContextFromMap,
   recordPendingHistoryEntry,
@@ -340,11 +343,13 @@ export async function prepareSlackMessage(params: {
       From: slackFrom,
     }) ?? (isDirectMessage ? senderName : roomLabel);
   const textWithId = `${rawBody}\n[slack message id: ${message.ts} channel: ${message.channel}]`;
-  const body = formatAgentEnvelope({
+  const body = formatInboundEnvelope({
     channel: "Slack",
     from: envelopeFrom,
     timestamp: message.ts ? Math.round(Number(message.ts) * 1000) : undefined,
     body: textWithId,
+    chatType: isDirectMessage ? "direct" : "channel",
+    sender: { name: senderName, id: senderId },
   });
 
   let combinedBody = body;
@@ -355,13 +360,15 @@ export async function prepareSlackMessage(params: {
       limit: ctx.historyLimit,
       currentMessage: combinedBody,
       formatEntry: (entry) =>
-        formatAgentEnvelope({
+        formatInboundEnvelope({
           channel: "Slack",
           from: roomLabel,
           timestamp: entry.timestamp,
-          body: `${entry.sender}: ${entry.body}${
+          body: `${entry.body}${
             entry.messageId ? ` [id:${entry.messageId} channel:${message.channel}]` : ""
           }`,
+          chatType: "channel",
+          senderLabel: entry.sender,
         }),
     });
   }

src/telegram/bot-message-context.sender-prefix.test.ts

@@ -0,0 +1,52 @@
+import { describe, expect, it, vi } from "vitest";
+
+import { buildTelegramMessageContext } from "./bot-message-context.js";
+
+describe("buildTelegramMessageContext sender prefix", () => {
+  it("prefixes group bodies with sender label", async () => {
+    const ctx = await buildTelegramMessageContext({
+      primaryCtx: {
+        message: {
+          message_id: 1,
+          chat: { id: -99, type: "supergroup", title: "Dev Chat" },
+          date: 1700000000,
+          text: "hello",
+          from: { id: 42, first_name: "Alice" },
+        },
+        me: { id: 7, username: "bot" },
+      } as never,
+      allMedia: [],
+      storeAllowFrom: [],
+      options: {},
+      bot: {
+        api: {
+          sendChatAction: vi.fn(),
+          setMessageReaction: vi.fn(),
+        },
+      } as never,
+      cfg: {
+        agents: { defaults: { model: "anthropic/claude-opus-4-5", workspace: "/tmp/clawd" } },
+        channels: { telegram: {} },
+        messages: { groupChat: { mentionPatterns: [] } },
+      } as never,
+      account: { accountId: "default" } as never,
+      historyLimit: 0,
+      groupHistories: new Map(),
+      dmPolicy: "open",
+      allowFrom: [],
+      groupAllowFrom: [],
+      ackReactionScope: "off",
+      logger: { info: vi.fn() },
+      resolveGroupActivation: () => undefined,
+      resolveGroupRequireMention: () => false,
+      resolveTelegramGroupConfig: () => ({
+        groupConfig: { requireMention: false },
+        topicConfig: undefined,
+      }),
+    });
+
+    expect(ctx).not.toBeNull();
+    const body = ctx?.ctxPayload?.Body ?? "";
+    expect(body).toContain("Alice (42): hello");
+  });
+});

src/telegram/bot-message-context.ts

@@ -2,7 +2,7 @@
 import { resolveAckReaction } from "../agents/identity.js";
 import { hasControlCommand } from "../auto-reply/command-detection.js";
 import { normalizeCommandBody } from "../auto-reply/commands-registry.js";
-import { formatAgentEnvelope } from "../auto-reply/envelope.js";
+import { formatInboundEnvelope } from "../auto-reply/envelope.js";
 import {
   buildPendingHistoryContextFromMap,
   recordPendingHistoryEntry,
@@ -325,14 +325,21 @@ export const buildTelegramMessageContext = async ({
       }]\n${replyTarget.body}\n[/Replying]`
     : "";
   const groupLabel = isGroup ? buildGroupLabel(msg, chatId, resolvedThreadId) : undefined;
+  const senderName = buildSenderName(msg);
   const conversationLabel = isGroup
     ? (groupLabel ?? `group:${chatId}`)
     : buildSenderLabel(msg, senderId || chatId);
-  const body = formatAgentEnvelope({
+  const body = formatInboundEnvelope({
     channel: "Telegram",
     from: conversationLabel,
     timestamp: msg.date ? msg.date * 1000 : undefined,
     body: `${bodyText}${replySuffix}`,
+    chatType: isGroup ? "group" : "direct",
+    sender: {
+      name: senderName,
+      username: senderUsername || undefined,
+      id: senderId || undefined,
+    },
   });
   let combinedBody = body;
   if (isGroup && historyKey && historyLimit > 0) {
@@ -342,11 +349,13 @@ export const buildTelegramMessageContext = async ({
       limit: historyLimit,
       currentMessage: combinedBody,
       formatEntry: (entry) =>
-        formatAgentEnvelope({
+        formatInboundEnvelope({
           channel: "Telegram",
           from: groupLabel ?? `group:${chatId}`,
           timestamp: entry.timestamp,
-          body: `${entry.sender}: ${entry.body} [id:${entry.messageId ?? "unknown"} chat:${chatId}]`,
+          body: `${entry.body} [id:${entry.messageId ?? "unknown"} chat:${chatId}]`,
+          chatType: "group",
+          senderLabel: entry.sender,
         }),
     });
   }
@@ -371,7 +380,7 @@ export const buildTelegramMessageContext = async ({
     ConversationLabel: conversationLabel,
     GroupSubject: isGroup ? (msg.chat.title ?? undefined) : undefined,
     GroupSystemPrompt: isGroup ? groupSystemPrompt : undefined,
-    SenderName: buildSenderName(msg),
+    SenderName: senderName,
     SenderId: senderId || undefined,
     SenderUsername: senderUsername || undefined,
     Provider: "telegram",

src/web/auto-reply/monitor/message-line.test.ts

@@ -0,0 +1,34 @@
+import { describe, expect, it } from "vitest";
+
+import { buildInboundLine } from "./message-line.js";
+
+describe("buildInboundLine", () => {
+  it("prefixes group messages with sender", () => {
+    const line = buildInboundLine({
+      cfg: {
+        agents: { defaults: { workspace: "/tmp/clawd" } },
+        channels: { whatsapp: { messagePrefix: "" } },
+      } as never,
+      agentId: "main",
+      msg: {
+        from: "123@g.us",
+        conversationId: "123@g.us",
+        to: "+15550009999",
+        accountId: "default",
+        body: "ping",
+        timestamp: 1700000000000,
+        chatType: "group",
+        chatId: "123@g.us",
+        senderJid: "111@s.whatsapp.net",
+        senderE164: "+15550001111",
+        senderName: "Bob",
+        sendComposing: async () => undefined,
+        reply: async () => undefined,
+        sendMedia: async () => undefined,
+      } as never,
+    });
+
+    expect(line).toContain("Bob (+15550001111):");
+    expect(line).toContain("ping");
+  });
+});

src/web/auto-reply/monitor/message-line.ts

@@ -1,5 +1,5 @@
 import { resolveMessagePrefix } from "../../../agents/identity.js";
-import { formatAgentEnvelope } from "../../../auto-reply/envelope.js";
+import { formatInboundEnvelope } from "../../../auto-reply/envelope.js";
 import type { loadConfig } from "../../../config/config.js";
 import type { WebInboundMsg } from "../types.js";
 
@@ -26,10 +26,16 @@ export function buildInboundLine(params: {
   const baseLine = `${prefixStr}${msg.body}${replyContext ? `\n\n${replyContext}` : ""}`;
 
   // Wrap with standardized envelope for the agent.
-  return formatAgentEnvelope({
+  return formatInboundEnvelope({
     channel: "WhatsApp",
     from: msg.chatType === "group" ? msg.from : msg.from?.replace(/^whatsapp:/, ""),
     timestamp: msg.timestamp,
     body: baseLine,
+    chatType: msg.chatType,
+    sender: {
+      name: msg.senderName,
+      e164: msg.senderE164,
+      id: msg.senderJid,
+    },
   });
 }

src/web/auto-reply/monitor/process-message.ts

@@ -8,7 +8,7 @@ import {
   type ResponsePrefixContext,
 } from "../../../auto-reply/reply/response-prefix-template.js";
 import { resolveTextChunkLimit } from "../../../auto-reply/chunk.js";
-import { formatAgentEnvelope } from "../../../auto-reply/envelope.js";
+import { formatInboundEnvelope } from "../../../auto-reply/envelope.js";
 import {
   buildHistoryContextFromEntries,
   type HistoryEntry,
@@ -95,11 +95,13 @@ export async function processMessage(params: {
           const bodyWithId = entry.messageId
             ? `${entry.body}\n[message_id: ${entry.messageId}]`
             : entry.body;
-          return formatAgentEnvelope({
+          return formatInboundEnvelope({
             channel: "WhatsApp",
             from: conversationId,
             timestamp: entry.timestamp,
-            body: `${entry.sender}: ${bodyWithId}`,
+            body: bodyWithId,
+            chatType: "group",
+            senderLabel: entry.sender,
           });
         },
       });