diff --git a/src/agents/pi-embedded-runner/compact.hooks.test.ts b/src/agents/pi-embedded-runner/compact.hooks.test.ts
index 236578ab15d..e6091af8b9e 100644
--- a/src/agents/pi-embedded-runner/compact.hooks.test.ts
+++ b/src/agents/pi-embedded-runner/compact.hooks.test.ts
@@ -3,6 +3,7 @@ import { beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
 import {
   applyExtraParamsToAgentMock,
   contextEngineCompactMock,
+  createOpenClawCodingToolsMock,
   ensureRuntimePluginsLoaded,
   estimateTokensMock,
   getMemorySearchManagerMock,
@@ -266,6 +267,27 @@ describe("compactEmbeddedPiSessionDirect hooks", () => {
     );
   });
 
+  it("preserves full sender identity when building compaction tools", async () => {
+    await compactEmbeddedPiSessionDirect({
+      sessionId: "session-1",
+      sessionFile: "/tmp/session.jsonl",
+      workspaceDir: "/tmp/workspace",
+      senderId: "sender-1",
+      senderName: "Alice",
+      senderUsername: "alice_u",
+      senderE164: "+15551234567",
+    });
+
+    expect(createOpenClawCodingToolsMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        senderId: "sender-1",
+        senderName: "Alice",
+        senderUsername: "alice_u",
+        senderE164: "+15551234567",
+      }),
+    );
+  });
+
   it("emits internal + plugin compaction hooks with counts", async () => {
     hookRunner.hasHooks.mockReturnValue(true);
     await runCompactionHooks({
diff --git a/src/agents/pi-embedded-runner/compact.ts b/src/agents/pi-embedded-runner/compact.ts
index 5d6f511d254..1a85f854ba2 100644
--- a/src/agents/pi-embedded-runner/compact.ts
+++ b/src/agents/pi-embedded-runner/compact.ts
@@ -161,6 +161,9 @@ export type CompactEmbeddedPiSessionParams = {
   currentMessageId?: string | number;
   /** Trusted sender id from inbound context for scoped message-tool discovery. */
   senderId?: string;
+  senderName?: string;
+  senderUsername?: string;
+  senderE164?: string;
   authProfileId?: string;
   /** Group id for channel-level tool policy resolution. */
   groupId?: string | null;
@@ -562,6 +565,10 @@ export async function compactEmbeddedPiSessionDirect(
       groupChannel: params.groupChannel,
       groupSpace: params.groupSpace,
       spawnedBy: params.spawnedBy,
+      senderId: params.senderId,
+      senderName: params.senderName,
+      senderUsername: params.senderUsername,
+      senderE164: params.senderE164,
       senderIsOwner: params.senderIsOwner,
       allowGatewaySubagentBinding: params.allowGatewaySubagentBinding,
       agentDir,
diff --git a/src/auto-reply/reply/agent-runner-memory.ts b/src/auto-reply/reply/agent-runner-memory.ts
index 4511f3c6975..fe819953f7f 100644
--- a/src/auto-reply/reply/agent-runner-memory.ts
+++ b/src/auto-reply/reply/agent-runner-memory.ts
@@ -444,6 +444,10 @@ export async function runPreflightCompactionIfNeeded(params: {
     groupId: entry.groupId ?? params.followupRun.run.groupId,
     groupChannel: entry.groupChannel ?? params.followupRun.run.groupChannel,
     groupSpace: entry.space ?? params.followupRun.run.groupSpace,
+    senderId: params.followupRun.run.senderId,
+    senderName: params.followupRun.run.senderName,
+    senderUsername: params.followupRun.run.senderUsername,
+    senderE164: params.followupRun.run.senderE164,
     sessionFile: sessionFile ?? params.followupRun.run.sessionFile,
     workspaceDir: params.followupRun.run.workspaceDir,
     agentDir: params.followupRun.run.agentDir,
diff --git a/src/auto-reply/reply/commands-compact.test.ts b/src/auto-reply/reply/commands-compact.test.ts
index f024236b270..0e0023dafc6 100644
--- a/src/auto-reply/reply/commands-compact.test.ts
+++ b/src/auto-reply/reply/commands-compact.test.ts
@@ -105,6 +105,9 @@ describe("handleCompactCommand", () => {
           CommandBody: "/compact: focus on decisions",
           From: "+15550001",
           To: "+15550002",
+          SenderName: "Alice",
+          SenderUsername: "alice_u",
+          SenderE164: "+15551234567",
         },
         agentDir: "/tmp/openclaw-agent-compact",
         sessionEntry: {
@@ -134,6 +137,10 @@ describe("handleCompactCommand", () => {
         groupChannel: "#general",
         groupSpace: "workspace-1",
         spawnedBy: "agent:main:parent",
+        senderId: "owner",
+        senderName: "Alice",
+        senderUsername: "alice_u",
+        senderE164: "+15551234567",
         agentDir: "/tmp/openclaw-agent-compact",
       }),
     );
diff --git a/src/auto-reply/reply/commands-compact.ts b/src/auto-reply/reply/commands-compact.ts
index 23c82adc130..5a94e7f053e 100644
--- a/src/auto-reply/reply/commands-compact.ts
+++ b/src/auto-reply/reply/commands-compact.ts
@@ -108,6 +108,10 @@ export const handleCompactCommand: CommandHandler = async (params) => {
     groupChannel: params.sessionEntry.groupChannel,
     groupSpace: params.sessionEntry.space,
     spawnedBy: params.sessionEntry.spawnedBy,
+    senderId: params.command.senderId,
+    senderName: params.ctx.SenderName,
+    senderUsername: params.ctx.SenderUsername,
+    senderE164: params.ctx.SenderE164,
     sessionFile: runtime.resolveSessionFilePath(
       sessionId,
       params.sessionEntry,
diff --git a/src/auto-reply/reply/commands-system-prompt.test.ts b/src/auto-reply/reply/commands-system-prompt.test.ts
index 9efed17fae0..92afb3049e8 100644
--- a/src/auto-reply/reply/commands-system-prompt.test.ts
+++ b/src/auto-reply/reply/commands-system-prompt.test.ts
@@ -54,12 +54,17 @@ function makeParams(): HandleCommandsParams {
   return {
     ctx: {
       SessionKey: "agent:main:default",
+      SenderId: "sender-1",
+      SenderName: "Alice",
+      SenderUsername: "alice_u",
+      SenderE164: "+15551234567",
     },
     cfg: {},
     command: {
       surface: "telegram",
       channel: "telegram",
       ownerList: [],
+      senderId: "sender-1",
       senderIsOwner: true,
       isAuthorizedSender: true,
       rawBodyNormalized: "/context",
@@ -117,6 +122,10 @@ describe("resolveCommandsSystemPromptBundle", () => {
         sessionKey: "agent:main:default",
         workspaceDir: "/tmp/workspace",
         messageProvider: "telegram",
+        senderId: "sender-1",
+        senderName: "Alice",
+        senderUsername: "alice_u",
+        senderE164: "+15551234567",
       }),
     );
   });
diff --git a/src/auto-reply/reply/commands-system-prompt.ts b/src/auto-reply/reply/commands-system-prompt.ts
index b03fc88bb1b..f4cd310a564 100644
--- a/src/auto-reply/reply/commands-system-prompt.ts
+++ b/src/auto-reply/reply/commands-system-prompt.ts
@@ -78,6 +78,10 @@ export async function resolveCommandsSystemPromptBundle(
         groupChannel: params.sessionEntry?.groupChannel ?? undefined,
         groupSpace: params.sessionEntry?.space ?? undefined,
         spawnedBy: params.sessionEntry?.spawnedBy ?? undefined,
+        senderId: params.command.senderId,
+        senderName: params.ctx.SenderName,
+        senderUsername: params.ctx.SenderUsername,
+        senderE164: params.ctx.SenderE164,
         senderIsOwner: params.command.senderIsOwner,
         modelProvider: params.provider,
         modelId: params.model,