diff --git a/src/agents/embedded-agent-runner/run/recovery-message-action-capability.test.ts b/src/agents/embedded-agent-runner/run/recovery-message-action-capability.test.ts
index 85b2f2318c32..035714198912 100644
--- a/src/agents/embedded-agent-runner/run/recovery-message-action-capability.test.ts
+++ b/src/agents/embedded-agent-runner/run/recovery-message-action-capability.test.ts
@@ -20,6 +20,9 @@ function createParams() {
     sessionId: "session-1",
     sessionKey: "agent:main:telegram:direct:chat-1",
     senderId: "user-1",
+    senderName: "User One",
+    senderUsername: "user-one",
+    senderE164: "+15551234567",
     timeoutMs: 60_000,
   };
 }
@@ -42,6 +45,9 @@ describe("createRecoveryMessageActionTurnCapability", () => {
     ).toMatchObject({
       requesterAccountId: "work",
       requesterSenderId: "user-1",
+      requesterSenderName: "User One",
+      requesterSenderUsername: "user-one",
+      requesterSenderE164: "+15551234567",
       sourceReplySessionKey: "agent:main:telegram:direct:chat-1",
       toolContext: {
         currentChannelId: "chat-1",
diff --git a/src/agents/embedded-agent-runner/run/recovery-message-action-capability.ts b/src/agents/embedded-agent-runner/run/recovery-message-action-capability.ts
index 316810397a23..9c78ec0911a3 100644
--- a/src/agents/embedded-agent-runner/run/recovery-message-action-capability.ts
+++ b/src/agents/embedded-agent-runner/run/recovery-message-action-capability.ts
@@ -28,6 +28,9 @@ type RecoveryMessageActionCapabilityParams = Pick<
   | "sessionId"
   | "sessionKey"
   | "senderId"
+  | "senderName"
+  | "senderUsername"
+  | "senderE164"
   | "timeoutMs"
 >;
 
@@ -56,6 +59,9 @@ export function createRecoveryMessageActionTurnCapability(
     sessionId: params.sessionId,
     requesterAccountId: params.agentAccountId,
     requesterSenderId: params.senderId ?? undefined,
+    requesterSenderName: params.senderName ?? undefined,
+    requesterSenderUsername: params.senderUsername ?? undefined,
+    requesterSenderE164: params.senderE164 ?? undefined,
     toolContext: {
       currentChannelId: params.currentChannelId,
       currentChatType: params.chatType,
diff --git a/src/agents/requester-tool-policy.ts b/src/agents/requester-tool-policy.ts
index d8c7b4c78381..66977ca01e17 100644
--- a/src/agents/requester-tool-policy.ts
+++ b/src/agents/requester-tool-policy.ts
@@ -246,6 +246,7 @@ export function resolveRequesterToolPolicies(
       ? resolveSenderToolPolicy({
           config: params.config,
           agentId: params.agentId,
+          sessionKey: params.sessionKey,
           messageProvider: params.messageProvider,
           senderId: params.senderId,
           senderName: params.senderName,
diff --git a/src/agents/sandbox-paths.ts b/src/agents/sandbox-paths.ts
index 386ac8facfc3..dba4038d4607 100644
--- a/src/agents/sandbox-paths.ts
+++ b/src/agents/sandbox-paths.ts
@@ -189,10 +189,10 @@ export function assertMediaNotDataUrl(media: string): void {
   }
 }
 
-function isManagedMediaPathUnderRoot(candidate: string): boolean {
+export function resolveManagedMediaRoot(candidate: string): string | undefined {
   const expanded = expandPath(candidate);
   if (!hostPathLooksAbsolute(expanded)) {
-    return false;
+    return undefined;
   }
   const mediaRoot = path.join(resolveConfigDir(), "media");
   const resolvedMediaRoot = path.resolve(mediaRoot);
@@ -201,18 +201,20 @@ function isManagedMediaPathUnderRoot(candidate: string): boolean {
     resolvedExpanded === resolvedMediaRoot ||
     !isPathInside(resolvedMediaRoot, resolvedExpanded)
   ) {
-    return false;
+    return undefined;
   }
   const relative = path.relative(resolvedMediaRoot, resolvedExpanded);
   const firstSegment = relative.split(path.sep)[0] ?? "";
-  return MANAGED_MEDIA_SUBDIRS.has(firstSegment) || firstSegment.startsWith("tool-");
+  return MANAGED_MEDIA_SUBDIRS.has(firstSegment) || firstSegment.startsWith("tool-")
+    ? path.join(resolvedMediaRoot, firstSegment)
+    : undefined;
 }
 
 export async function resolveAllowedManagedMediaPath(
   candidate: string,
 ): Promise<string | undefined> {
   const expanded = expandPath(candidate);
-  if (!isManagedMediaPathUnderRoot(expanded)) {
+  if (!resolveManagedMediaRoot(expanded)) {
     return undefined;
   }
   const resolved = path.resolve(expanded);
diff --git a/src/agents/sender-tool-policy.ts b/src/agents/sender-tool-policy.ts
index ec531bc31c68..355172085e19 100644
--- a/src/agents/sender-tool-policy.ts
+++ b/src/agents/sender-tool-policy.ts
@@ -5,6 +5,7 @@
  */
 import { resolveToolsBySender } from "../config/group-policy.js";
 import type { OpenClawConfig } from "../config/types.openclaw.js";
+import { parseSessionDeliveryRoute } from "../routing/session-key.js";
 import { resolveAgentConfig } from "./agent-scope.js";
 import { pickSandboxToolPolicy } from "./sandbox-tool-policy.js";
 import type { SandboxToolPolicy } from "./sandbox/types.js";
@@ -12,6 +13,7 @@ import type { SandboxToolPolicy } from "./sandbox/types.js";
 type SenderToolPolicyParams = {
   config?: OpenClawConfig;
   agentId?: string;
+  sessionKey?: string | null;
   messageProvider?: string | null;
   senderId?: string | null;
   senderName?: string | null;
@@ -27,8 +29,11 @@ export function resolveSenderToolPolicy(
   if (!cfg) {
     return undefined;
   }
+  // The requester session is authoritative when a message action targets a different channel.
+  const messageProvider =
+    parseSessionDeliveryRoute(params.sessionKey)?.channel ?? params.messageProvider;
   const sender = {
-    messageProvider: params.messageProvider,
+    messageProvider,
     senderId: params.senderId,
     senderName: params.senderName,
     senderUsername: params.senderUsername,
diff --git a/src/agents/tools/message-tool-execution.ts b/src/agents/tools/message-tool-execution.ts
index 08ac64ba6ed8..cb5ebf5b61c9 100644
--- a/src/agents/tools/message-tool-execution.ts
+++ b/src/agents/tools/message-tool-execution.ts
@@ -19,7 +19,7 @@ import { getScopedChannelsCommandSecretTargets } from "../../cli/command-secret-
 import { resolveMessageSecretScope } from "../../cli/message-secret-scope.js";
 import { getRuntimeConfig } from "../../config/config.js";
 import type { OpenClawConfig } from "../../config/types.openclaw.js";
-import { resolveMessageActionTurnCapability } from "../../gateway/message-action-turn-capability.js";
+import * as messageActionTurnCapability from "../../gateway/message-action-turn-capability.js";
 import { createAbortError } from "../../infra/abort-signal.js";
 import { sha256Base64UrlPrefix } from "../../infra/crypto-digest.js";
 import { resolveMessageChannelSelection } from "../../infra/outbound/channel-selection.js";
@@ -370,7 +370,7 @@ export function createMessageTool(options?: MessageToolOptions): AnyAgentTool {
       const deliveryRunId = options?.runId ?? executionIdentityToken?.runId;
       const trustedTurnContext =
         resolvedAgentId && options?.agentSessionKey
-          ? resolveMessageActionTurnCapability({
+          ? messageActionTurnCapability.resolveMessageActionTurnCapability({
               token: options.messageActionTurnCapability,
               agentId: resolvedAgentId,
               runId: options.runId,
@@ -652,8 +652,7 @@ export function createMessageTool(options?: MessageToolOptions): AnyAgentTool {
           params: actionParams,
           actionOrigin: "message-tool",
           defaultAccountId: accountId ?? undefined,
-          requesterAccountId: trustedTurnContext?.requesterAccountId,
-          requesterSenderId: trustedTurnContext?.requesterSenderId,
+          ...messageActionTurnCapability.selectMessageActionRequesterIdentity(trustedTurnContext),
           messageActionAuthorization: {
             requesterAccountId: trustedTurnContext?.requesterAccountId,
             requesterSenderId: trustedTurnContext?.requesterSenderId,
diff --git a/src/agents/tools/message-tool.test.ts b/src/agents/tools/message-tool.test.ts
index 9d4d998eeea4..bb6705882cf2 100644
--- a/src/agents/tools/message-tool.test.ts
+++ b/src/agents/tools/message-tool.test.ts
@@ -188,6 +188,9 @@ type RunMessageActionInput = {
   params?: Record<string, unknown>;
   requesterAccountId?: string;
   requesterSenderId?: string;
+  requesterSenderName?: string;
+  requesterSenderUsername?: string;
+  requesterSenderE164?: string;
   runId?: string;
   messageActionAuthorization?: {
     requesterAccountId?: string;
@@ -5131,6 +5134,9 @@ describe("message tool sandbox passthrough", () => {
       sessionId: "session-1",
       requesterAccountId: "trusted-account",
       requesterSenderId: "trusted-sender",
+      requesterSenderName: "Trusted Sender",
+      requesterSenderUsername: "trusted-user",
+      requesterSenderE164: "+15551234567",
       toolContext: {
         currentChannelProvider: "discord",
         currentChannelId: "trusted-current",
@@ -5159,6 +5165,9 @@ describe("message tool sandbox passthrough", () => {
 
     expect(call?.requesterAccountId).toBe("trusted-account");
     expect(call?.requesterSenderId).toBe("trusted-sender");
+    expect(call?.requesterSenderName).toBe("Trusted Sender");
+    expect(call?.requesterSenderUsername).toBe("trusted-user");
+    expect(call?.requesterSenderE164).toBe("+15551234567");
     expect(call?.toolContext).toMatchObject({
       currentChannelProvider: "discord",
       currentChannelId: "forged-current",
diff --git a/src/agents/web-search-tool-policy.ts b/src/agents/web-search-tool-policy.ts
index 5276eebe2139..a59405d710d9 100644
--- a/src/agents/web-search-tool-policy.ts
+++ b/src/agents/web-search-tool-policy.ts
@@ -83,6 +83,7 @@ export function resolveWebSearchToolPolicy(
   const senderPolicyParams = {
     config: params.config,
     agentId,
+    sessionKey: params.sessionKey,
     messageProvider: params.messageProvider,
   };
   const requesterPolicies = resolveRequesterToolPolicies({
diff --git a/src/auto-reply/reply/agent-runner-embedded-candidate.ts b/src/auto-reply/reply/agent-runner-embedded-candidate.ts
index 1d538b61019d..9c1c99ada1d2 100644
--- a/src/auto-reply/reply/agent-runner-embedded-candidate.ts
+++ b/src/auto-reply/reply/agent-runner-embedded-candidate.ts
@@ -164,6 +164,9 @@ export async function runEmbeddedFallbackCandidate(params: {
           sessionId: embeddedContext.sessionId,
           requesterAccountId: embeddedContext.agentAccountId,
           requesterSenderId: senderContext.senderId,
+          requesterSenderName: senderContext.senderName,
+          requesterSenderUsername: senderContext.senderUsername,
+          requesterSenderE164: senderContext.senderE164,
           toolContext: {
             currentChannelId: embeddedContext.currentChannelId,
             currentChatType: embeddedContext.chatType,
diff --git a/src/auto-reply/reply/commands-btw.ts b/src/auto-reply/reply/commands-btw.ts
index 1d4d1e0db8b7..570c00828465 100644
--- a/src/auto-reply/reply/commands-btw.ts
+++ b/src/auto-reply/reply/commands-btw.ts
@@ -80,6 +80,9 @@ export const handleBtwCommand: CommandHandler = defineAuthorizedTextCommand(
               sessionId: targetSessionEntry.sessionId,
               requesterAccountId: params.ctx.AccountId,
               requesterSenderId: params.ctx.SenderId ?? params.command.senderId,
+              requesterSenderName: params.ctx.SenderName,
+              requesterSenderUsername: params.ctx.SenderUsername,
+              requesterSenderE164: params.ctx.SenderE164,
               toolContext: {
                 currentChannelId,
                 currentChatType: chatType,
diff --git a/src/gateway/agent-runtime-identity-token.test.ts b/src/gateway/agent-runtime-identity-token.test.ts
index 001e506c76d7..e67c8f88085a 100644
--- a/src/gateway/agent-runtime-identity-token.test.ts
+++ b/src/gateway/agent-runtime-identity-token.test.ts
@@ -463,6 +463,9 @@ describe("agent runtime identity token", () => {
         sessionId: "session-id-1",
         requesterAccountId: "ops",
         requesterSenderId: "sender-1",
+        requesterSenderName: "Sender One",
+        requesterSenderUsername: "sender-one",
+        requesterSenderE164: "+15551234567",
         toolContext: {
           currentChannelProvider: "matrix",
           currentChannelId: "!room:example.org",
@@ -485,6 +488,9 @@ describe("agent runtime identity token", () => {
         sessionId: "session-id-1",
         requesterAccountId: "ops",
         requesterSenderId: "sender-1",
+        requesterSenderName: "Sender One",
+        requesterSenderUsername: "sender-one",
+        requesterSenderE164: "+15551234567",
         toolContext: {
           currentChannelProvider: "matrix",
           currentChannelId: "!room:example.org",
diff --git a/src/gateway/agent-runtime-identity-token.ts b/src/gateway/agent-runtime-identity-token.ts
index 9f28e8a427ce..403155d2dcf1 100644
--- a/src/gateway/agent-runtime-identity-token.ts
+++ b/src/gateway/agent-runtime-identity-token.ts
@@ -198,6 +198,9 @@ const messageActionContextSchema = z.object({
   sourceReplySessionKey: ignoredOptionalStringSchema,
   requesterAccountId: ignoredOptionalStringSchema,
   requesterSenderId: ignoredOptionalStringSchema,
+  requesterSenderName: ignoredOptionalStringSchema,
+  requesterSenderUsername: ignoredOptionalStringSchema,
+  requesterSenderE164: ignoredOptionalStringSchema,
   toolContext: messageActionToolContextSchema.optional(),
 });
 const cronSelfManagementContextSchema = z.object({
@@ -291,6 +294,9 @@ function decodeMessageActionContext(
     sourceReplySessionKey: value.sourceReplySessionKey,
     requesterAccountId: value.requesterAccountId,
     requesterSenderId: value.requesterSenderId,
+    requesterSenderName: value.requesterSenderName,
+    requesterSenderUsername: value.requesterSenderUsername,
+    requesterSenderE164: value.requesterSenderE164,
     toolContext: value.toolContext,
   };
   if (value.sourceReplyFinal === true) {
diff --git a/src/gateway/message-action-turn-capability.test.ts b/src/gateway/message-action-turn-capability.test.ts
index cd16a13b3691..4a78bce238ee 100644
--- a/src/gateway/message-action-turn-capability.test.ts
+++ b/src/gateway/message-action-turn-capability.test.ts
@@ -24,6 +24,9 @@ describe("message action turn capability", () => {
       sessionId: "session-1",
       requesterAccountId: "ops",
       requesterSenderId: "@sender:example.org",
+      requesterSenderName: "Sender Name",
+      requesterSenderUsername: "sender-user",
+      requesterSenderE164: "+15551234567",
       toolContext: {
         currentChannelProvider: "matrix",
         currentChannelId: "!room-1:example.org",
@@ -49,6 +52,9 @@ describe("message action turn capability", () => {
       sessionId: "session-1",
       requesterAccountId: "ops",
       requesterSenderId: "@sender:example.org",
+      requesterSenderName: "Sender Name",
+      requesterSenderUsername: "sender-user",
+      requesterSenderE164: "+15551234567",
       toolContext: {
         currentChannelProvider: "matrix",
         currentChannelId: "!room-1:example.org",
diff --git a/src/gateway/message-action-turn-capability.ts b/src/gateway/message-action-turn-capability.ts
index 1161245536e9..fa6811e2b03c 100644
--- a/src/gateway/message-action-turn-capability.ts
+++ b/src/gateway/message-action-turn-capability.ts
@@ -14,13 +14,19 @@ const MAX_ACTIVE_CAPABILITIES = 4096;
 const RUN_LIFETIME_EXPIRES_AT_MS = Number.MAX_SAFE_INTEGER;
 const CAPABILITY_COMPLETION_GRACE_MS = 60_000;
 
-type AgentRuntimeMessageActionContextBase = {
+type MessageActionRequesterIdentity = {
+  requesterAccountId?: string;
+  requesterSenderId?: string;
+  requesterSenderName?: string;
+  requesterSenderUsername?: string;
+  requesterSenderE164?: string;
+};
+
+type AgentRuntimeMessageActionContextBase = MessageActionRequesterIdentity & {
   expiresAtMs: number;
   sessionId?: string;
   /** Durable session entry that owns restart-recovery receipt state. */
   sourceReplySessionKey?: string;
-  requesterAccountId?: string;
-  requesterSenderId?: string;
   toolContext?: InternalChannelThreadingToolContext;
 };
 
@@ -36,6 +42,18 @@ export type AgentRuntimeMessageActionContext = AgentRuntimeMessageActionContextB
       }
   );
 
+export function selectMessageActionRequesterIdentity(
+  context: MessageActionRequesterIdentity | undefined,
+): MessageActionRequesterIdentity {
+  return {
+    requesterAccountId: context?.requesterAccountId,
+    requesterSenderId: context?.requesterSenderId,
+    requesterSenderName: context?.requesterSenderName,
+    requesterSenderUsername: context?.requesterSenderUsername,
+    requesterSenderE164: context?.requesterSenderE164,
+  };
+}
+
 type MessageActionTurnCapability = AgentRuntimeMessageActionContext & {
   agentId: string;
   runId: string;
@@ -112,6 +130,9 @@ export function mintMessageActionTurnCapability(params: {
   sessionId?: string;
   requesterAccountId?: string;
   requesterSenderId?: string;
+  requesterSenderName?: string;
+  requesterSenderUsername?: string;
+  requesterSenderE164?: string;
   toolContext?: InternalChannelThreadingToolContext;
   expiresWithRun?: boolean;
   ttlMs?: number;
@@ -140,6 +161,9 @@ export function mintMessageActionTurnCapability(params: {
     sourceReplySessionKey: normalizeOptionalString(params.sourceReplySessionKey),
     requesterAccountId: normalizeOptionalString(params.requesterAccountId),
     requesterSenderId: normalizeOptionalString(params.requesterSenderId),
+    requesterSenderName: normalizeOptionalString(params.requesterSenderName),
+    requesterSenderUsername: normalizeOptionalString(params.requesterSenderUsername),
+    requesterSenderE164: normalizeOptionalString(params.requesterSenderE164),
     toolContext: copyToolContext(params.toolContext),
   });
   return token;
@@ -180,6 +204,9 @@ export function resolveMessageActionTurnCapability(params: {
     sourceReplySessionKey: capability.sourceReplySessionKey,
     requesterAccountId: capability.requesterAccountId,
     requesterSenderId: capability.requesterSenderId,
+    requesterSenderName: capability.requesterSenderName,
+    requesterSenderUsername: capability.requesterSenderUsername,
+    requesterSenderE164: capability.requesterSenderE164,
     toolContext: copyToolContext(capability.toolContext),
   };
 }
diff --git a/src/gateway/server-methods/send.test.ts b/src/gateway/server-methods/send.test.ts
index cb32928f6923..74bafe841ea6 100644
--- a/src/gateway/server-methods/send.test.ts
+++ b/src/gateway/server-methods/send.test.ts
@@ -14,6 +14,8 @@ import { createDeferred } from "../../../test/helpers/promise.js";
 import { jsonResult } from "../../agents/tools/common.js";
 import type { ChannelPlugin } from "../../channels/plugins/types.public.js";
 import type { SessionTranscriptAppendResult } from "../../config/sessions/transcript.js";
+import { buildOutboundMediaLoadOptions } from "../../media/load-options.js";
+import { loadWebMediaRaw } from "../../media/web-media.js";
 import { setActivePluginRegistry } from "../../plugins/runtime.js";
 import { AGENT_HARNESS_SESSION_KEY_RESERVED_MESSAGE } from "../../sessions/agent-harness-session-key.js";
 import {
@@ -319,6 +321,9 @@ async function runMessageActionRequest(
           sourceReplyToolCallId?: string;
           requesterAccountId?: string;
           requesterSenderId?: string;
+          requesterSenderName?: string;
+          requesterSenderUsername?: string;
+          requesterSenderE164?: string;
           toolContext?: Record<string, unknown>;
         };
       };
@@ -4065,7 +4070,7 @@ describe("gateway send mirroring", () => {
     expect(mocks.completeRestartRecoveryTerminalDelivery).not.toHaveBeenCalled();
   });
 
-  it("passes agent-scoped media roots to gateway message actions", async () => {
+  it("passes reader-free agent-scoped media access to gateway attachment actions", async () => {
     registerMessageActionPlugin({
       action: "sendAttachment",
       registrySuffix: "message-action-media-roots",
@@ -4085,7 +4090,12 @@ describe("gateway send mirroring", () => {
     expect(firstRespondCall(respond)[0]).toBe(true);
     const actionCall = lastDispatchChannelMessageActionCall();
     expect(actionCall?.mediaLocalRoots).toContain(TEST_AGENT_WORKSPACE);
-    expect(actionCall).not.toHaveProperty("mediaAccess");
+    expect(actionCall?.mediaAccess).toMatchObject({
+      localRoots: expect.arrayContaining([TEST_AGENT_WORKSPACE]),
+      workspaceDir: TEST_AGENT_WORKSPACE,
+    });
+    expect(actionCall?.mediaAccess.localRoots).toBe(actionCall?.mediaLocalRoots);
+    expect(actionCall?.mediaAccess).not.toHaveProperty("readFile");
     expect(actionCall).not.toHaveProperty("mediaReadFile");
     expect(actionCall?.gatewayClientScopes).toEqual(["operator.write"]);
   });
@@ -4169,6 +4179,103 @@ describe("gateway send mirroring", () => {
     expect(actionCall).not.toHaveProperty("mediaReadFile");
   });
 
+  it.each([
+    {
+      action: "send" as const,
+      params: { to: "123", message: "chart" },
+    },
+    {
+      action: "sendAttachment" as const,
+      params: { chatId: "123" },
+    },
+  ])(
+    "applies signed sender aliases to gateway $action media policy",
+    async ({ action, params }) => {
+      registerMessageActionPlugin({
+        action,
+        registrySuffix: `message-action-signed-sender-alias-policy-${action}`,
+      });
+      const sessionKey = "agent:work:telegram:direct:123";
+
+      await withTempOpenClawStateDir(async (stateDir) => {
+        const workspaceFile = path.join(
+          TEST_AGENT_WORKSPACE,
+          `gateway-alias-denied-${process.pid}.bin`,
+        );
+        const managedFile = path.join(stateDir, "media", "outbound", "managed.bin");
+        await fs.mkdir(TEST_AGENT_WORKSPACE, { recursive: true });
+        await fs.mkdir(path.dirname(managedFile), { recursive: true });
+        await fs.writeFile(workspaceFile, "private");
+        await fs.writeFile(managedFile, "managed");
+
+        try {
+          const { respond } = await runMessageActionRequest(
+            {
+              channel: "telegram",
+              action,
+              params: { ...params, mediaUrl: workspaceFile },
+              requesterSenderId: "forged-allowed-sender",
+              sessionKey,
+              agentId: "work",
+              idempotencyKey: `idem-message-action-signed-sender-alias-policy-${action}`,
+            },
+            {
+              internal: {
+                agentRuntimeIdentity: {
+                  kind: "agentRuntime",
+                  agentId: "work",
+                  sessionKey,
+                  messageActionContext: {
+                    expiresAtMs: Date.now() + 60_000,
+                    requesterSenderId: "allowed-id",
+                    requesterSenderName: "Blocked Sender",
+                    requesterSenderUsername: "blocked-user",
+                    requesterSenderE164: "+15551234567",
+                  },
+                },
+              },
+            },
+            {
+              ...makeContext(),
+              getRuntimeConfig: () => ({
+                agents: { list: [{ id: "main" }, { id: "work" }] },
+                tools: {
+                  allow: ["read"],
+                  toolsBySender: { "username:blocked-user": { deny: ["read"] } },
+                },
+              }),
+            } as GatewayRequestContext,
+          );
+
+          expect(firstRespondCall(respond)[0]).toBe(true);
+          const actionCall = lastDispatchChannelMessageActionCall();
+          expect(actionCall).toMatchObject({
+            requesterSenderId: "allowed-id",
+            requesterSenderName: "Blocked Sender",
+            requesterSenderUsername: "blocked-user",
+            requesterSenderE164: "+15551234567",
+          });
+          if (action === "send") {
+            expect(actionCall?.params).toMatchObject({ mediaUrl: workspaceFile });
+            expect(actionCall?.params).not.toHaveProperty("buffer");
+          }
+          const mediaAccess = actionCall?.mediaAccess;
+          expect(mediaAccess.localRoots).not.toContain(TEST_AGENT_WORKSPACE);
+          await expect(
+            loadWebMediaRaw(workspaceFile, buildOutboundMediaLoadOptions({ mediaAccess })),
+          ).rejects.toThrow(/not under an allowed directory/i);
+          const managed = await loadWebMediaRaw(
+            managedFile,
+            buildOutboundMediaLoadOptions({ mediaAccess }),
+          );
+          expect(managed.buffer.toString()).toBe("managed");
+        } finally {
+          await fs.rm(workspaceFile, { force: true });
+        }
+      });
+    },
+  );
+
   it("materializes buffer-only message.action sends on the gateway before plugin dispatch", async () => {
     registerMessageActionPlugin({ registrySuffix: "message-action-buffer-materialize" });
 
diff --git a/src/gateway/server-methods/send.ts b/src/gateway/server-methods/send.ts
index 0e644ade7668..454df96e5407 100644
--- a/src/gateway/server-methods/send.ts
+++ b/src/gateway/server-methods/send.ts
@@ -74,6 +74,7 @@ import {
 } from "../../sessions/session-key-utils.js";
 import { INTERNAL_MESSAGE_CHANNEL, normalizeMessageChannel } from "../../utils/message-channel.js";
 import { resolveGatewayConversationReadOrigin } from "../conversation-read-origin.js";
+import { selectMessageActionRequesterIdentity } from "../message-action-turn-capability.js";
 import { ADMIN_SCOPE } from "../operator-scopes.js";
 import { resolveGatewayPluginConfig } from "../runtime-plugin-config.js";
 import { DEDUPE_MAX, DEDUPE_TTL_MS } from "../server-constants.js";
@@ -207,17 +208,15 @@ function resolveTrustedMessageActionToolContext(params: {
     sessionId?: string;
   };
 }):
-  | {
+  | ({
       ok: true;
       toolContext: InternalChannelThreadingToolContext | undefined;
-      requesterAccountId: string | undefined;
-      requesterSenderId: string | undefined;
       sessionId: string | undefined;
       sourceReplySessionKey: string | undefined;
       sourceReplyFinal: boolean | undefined;
       sourceReplyToolCallId: string | undefined;
       runtimeAgentId: string | undefined;
-    }
+    } & ReturnType<typeof selectMessageActionRequesterIdentity>)
   | { ok: false; error: ReturnType<typeof errorShape> } {
   // Current-turn metadata can relax channel read policy. It must come from the
   // signed ingress-issued turn context, never from message.action request fields.
@@ -227,8 +226,7 @@ function resolveTrustedMessageActionToolContext(params: {
     return {
       ok: true,
       toolContext: undefined,
-      requesterAccountId: undefined,
-      requesterSenderId: undefined,
+      ...selectMessageActionRequesterIdentity(undefined),
       sessionId: undefined,
       sourceReplySessionKey: undefined,
       sourceReplyFinal: undefined,
@@ -276,8 +274,7 @@ function resolveTrustedMessageActionToolContext(params: {
   return {
     ok: true,
     toolContext: messageActionContext.toolContext,
-    requesterAccountId: messageActionContext.requesterAccountId,
-    requesterSenderId: messageActionContext.requesterSenderId,
+    ...selectMessageActionRequesterIdentity(messageActionContext),
     sessionId: messageActionContext.sessionId,
     sourceReplySessionKey,
     sourceReplyFinal: messageActionContext.sourceReplyFinal,
@@ -1002,29 +999,25 @@ export const sendHandlers: GatewayRequestHandlers = {
           if (accountId) {
             request.params.accountId = accountId;
           }
-          const resolvedMediaAccess =
-            request.action === "send"
-              ? resolveAgentScopedOutboundMediaAccess({
-                  cfg,
-                  agentId,
-                  sessionKey,
-                  messageProvider: sessionKey ? undefined : channel,
-                  accountId: sessionKey
-                    ? (trustedContext.requesterAccountId ?? accountId)
-                    : accountId,
-                  requesterSenderId: trustedContext.requesterSenderId,
-                })
-              : undefined;
-          // Gateway identities omit trusted sender aliases; expose roots/workspace
-          // only so a host reader cannot bypass alias-based group read policy.
-          const mediaAccess = resolvedMediaAccess
-            ? {
-                localRoots: resolvedMediaAccess.localRoots,
-                ...(resolvedMediaAccess.workspaceDir
-                  ? { workspaceDir: resolvedMediaAccess.workspaceDir }
-                  : {}),
-              }
-            : undefined;
+          const resolvedMediaAccess = resolveAgentScopedOutboundMediaAccess({
+            cfg,
+            agentId,
+            sessionKey,
+            messageProvider: sessionKey ? undefined : channel,
+            accountId: sessionKey ? (trustedContext.requesterAccountId ?? accountId) : accountId,
+            requesterSenderId: trustedContext.requesterSenderId,
+            requesterSenderName: trustedContext.requesterSenderName,
+            requesterSenderUsername: trustedContext.requesterSenderUsername,
+            requesterSenderE164: trustedContext.requesterSenderE164,
+          });
+          // Gateway actions receive policy-scoped roots/workspace only; the
+          // originating agent turn never delegates its host reader over RPC.
+          const mediaAccess = {
+            localRoots: resolvedMediaAccess.localRoots,
+            ...(resolvedMediaAccess.workspaceDir
+              ? { workspaceDir: resolvedMediaAccess.workspaceDir }
+              : {}),
+          };
           if (request.action === "send") {
             await hydrateAttachmentParamsForAction({
               cfg,
@@ -1033,7 +1026,7 @@ export const sendHandlers: GatewayRequestHandlers = {
               args: request.params,
               action: "send",
               mediaPolicy: resolveAttachmentMediaPolicy({
-                mediaLocalRoots: getAgentScopedMediaLocalRoots(cfg, agentId),
+                mediaAccess: resolvedMediaAccess,
               }),
             });
           }
@@ -1080,8 +1073,7 @@ export const sendHandlers: GatewayRequestHandlers = {
             cfg,
             params: request.params,
             accountId,
-            requesterAccountId: trustedContext.requesterAccountId,
-            requesterSenderId: trustedContext.requesterSenderId,
+            ...selectMessageActionRequesterIdentity(trustedContext),
             senderIsOwner: gatewayClientScopes.includes(ADMIN_SCOPE)
               ? request.senderIsOwner === true
               : false,
@@ -1090,9 +1082,8 @@ export const sendHandlers: GatewayRequestHandlers = {
             sessionId: normalizeOptionalString(request.sessionId) ?? undefined,
             inboundEventKind: request.inboundTurnKind,
             agentId,
-            ...(mediaAccess
-              ? { mediaAccess, mediaLocalRoots: mediaAccess.localRoots }
-              : { mediaLocalRoots: getAgentScopedMediaLocalRoots(cfg, agentId) }),
+            mediaAccess,
+            mediaLocalRoots: mediaAccess.localRoots,
             toolContext: trustedContext.toolContext,
             dryRun: false,
             gatewayClientScopes,
diff --git a/src/media/read-capability.test.ts b/src/media/read-capability.test.ts
index 1e5d98418ab0..e846539ad7f6 100644
--- a/src/media/read-capability.test.ts
+++ b/src/media/read-capability.test.ts
@@ -4,10 +4,13 @@ import os from "node:os";
 import path from "node:path";
 import { __setFsSafeTestHooksForTest } from "@openclaw/fs-safe/test-hooks";
 import { afterEach, describe, expect, it, vi } from "vitest";
+import { useAutoCleanupTempDirTracker } from "../../test/helpers/temp-dir.js";
 import type { OpenClawConfig } from "../config/types.js";
 import { readOutboundMediaFile } from "./bounded-read-file.js";
+import { buildOutboundMediaLoadOptions } from "./load-options.js";
 import { getDefaultMediaLocalRoots } from "./local-roots.js";
 import { resolveAgentScopedOutboundMediaAccess } from "./read-capability.js";
+import { loadWebMediaRaw } from "./web-media.js";
 
 const channelPluginMocks = vi.hoisted(() => ({
   getLoadedChannelPlugin: vi.fn<
@@ -21,6 +24,8 @@ const channelPluginMocks = vi.hoisted(() => ({
   >(() => undefined),
 }));
 
+const tempDirs = useAutoCleanupTempDirTracker(afterEach);
+
 vi.mock("../channels/plugins/index.js", () => ({
   getChannelPlugin: () => undefined,
   getLoadedChannelPlugin: channelPluginMocks.getLoadedChannelPlugin,
@@ -113,6 +118,156 @@ describe("resolveAgentScopedOutboundMediaAccess", () => {
     expect(result.localRoots).not.toContain("/Users/peter/Pictures");
   });
 
+  it.each([
+    {
+      name: "global sender id",
+      cfg: {
+        tools: {
+          allow: ["read"],
+          toolsBySender: { "id:attacker": { deny: ["read"] } },
+        },
+      } as OpenClawConfig,
+      identity: { messageProvider: "requestchat", requesterSenderId: "attacker" },
+    },
+    {
+      name: "agent sender username",
+      cfg: {
+        tools: { allow: ["read"] },
+        agents: {
+          list: [
+            {
+              id: "restricted",
+              workspace: "/tmp/restricted-workspace",
+              tools: {
+                toolsBySender: { "username:blocked-user": { deny: ["read"] } },
+              },
+            },
+          ],
+        },
+      } as OpenClawConfig,
+      identity: {
+        agentId: "restricted",
+        messageProvider: "requestchat",
+        requesterSenderUsername: "blocked-user",
+      },
+    },
+    {
+      name: "session-derived channel sender id",
+      cfg: {
+        tools: {
+          allow: ["read"],
+          toolsBySender: { "channel:requestchat:attacker": { deny: ["read"] } },
+        },
+      } as OpenClawConfig,
+      identity: {
+        sessionKey: "agent:main:requestchat:group:ops",
+        requesterSenderId: "attacker",
+      },
+    },
+    {
+      name: "sender wildcard",
+      cfg: {
+        tools: {
+          allow: ["read"],
+          toolsBySender: { "*": { deny: ["read"] } },
+        },
+      } as OpenClawConfig,
+      identity: { messageProvider: "requestchat", requesterSenderId: "attacker" },
+    },
+    {
+      name: "sender wildcard without identity",
+      cfg: {
+        tools: {
+          allow: ["read"],
+          toolsBySender: { "*": { deny: ["read"] } },
+        },
+      } as OpenClawConfig,
+      identity: { messageProvider: "requestchat" },
+    },
+  ])("does not enable host reads for $name policy", ({ cfg, identity }) => {
+    const result = resolveAgentScopedOutboundMediaAccess({
+      cfg,
+      ...identity,
+      mediaSources: ["/Users/peter/Pictures/photo.png"],
+    });
+
+    expect(result.readFile).toBeUndefined();
+    expect(result.localRoots).not.toContain("/Users/peter/Pictures");
+  });
+
+  it("keeps host reads enabled when agent sender policy allows the requester", () => {
+    const cfg: OpenClawConfig = {
+      tools: {
+        allow: ["read"],
+        toolsBySender: { "*": { deny: ["read"] } },
+      },
+      agents: {
+        list: [
+          {
+            id: "trusted",
+            workspace: "/tmp/trusted-workspace",
+            tools: { toolsBySender: { "id:trusted-user": {} } },
+          },
+        ],
+      },
+    };
+
+    const result = resolveAgentScopedOutboundMediaAccess({
+      cfg,
+      agentId: "trusted",
+      messageProvider: "requestchat",
+      requesterSenderId: "trusted-user",
+      mediaSources: ["/Users/peter/Pictures/photo.png"],
+    });
+
+    expect(result.readFile).toBeTypeOf("function");
+    expect(result.localRoots).toContain("/Users/peter/Pictures");
+  });
+
+  it("blocks denied workspace attachments while preserving managed artifacts", async () => {
+    const baseDir = tempDirs.make("openclaw-media-sender-policy-");
+    const stateDir = path.join(baseDir, "state");
+    const workspaceDir = path.join(baseDir, "workspace");
+    const workspaceFile = path.join(workspaceDir, "private.bin");
+    const managedFile = path.join(stateDir, "media", "tool-image-generation", "result.bin");
+    vi.stubEnv("OPENCLAW_STATE_DIR", stateDir);
+    await fs.mkdir(path.dirname(managedFile), { recursive: true });
+    await fs.mkdir(workspaceDir, { recursive: true });
+    await fs.writeFile(workspaceFile, "private");
+    await fs.writeFile(managedFile, "managed");
+    const cfg: OpenClawConfig = {
+      tools: {
+        allow: ["read"],
+        toolsBySender: { "id:attacker": { deny: ["read"] } },
+      },
+      agents: { list: [{ id: "restricted", workspace: workspaceDir }] },
+    };
+
+    const deniedAccess = resolveAgentScopedOutboundMediaAccess({
+      cfg,
+      agentId: "restricted",
+      messageProvider: "requestchat",
+      requesterSenderId: "attacker",
+      mediaSources: [workspaceFile],
+    });
+    await expect(
+      loadWebMediaRaw(workspaceFile, buildOutboundMediaLoadOptions({ mediaAccess: deniedAccess })),
+    ).rejects.toThrow(/not under an allowed directory/i);
+
+    const managedAccess = resolveAgentScopedOutboundMediaAccess({
+      cfg,
+      agentId: "restricted",
+      messageProvider: "requestchat",
+      requesterSenderId: "attacker",
+      mediaSources: [managedFile],
+    });
+    const loaded = await loadWebMediaRaw(
+      managedFile,
+      buildOutboundMediaLoadOptions({ mediaAccess: managedAccess }),
+    );
+    expect(loaded.buffer.toString()).toBe("managed");
+  });
+
   it("honors plugin-owned group tool policy with channel metadata", () => {
     const resolveToolPolicy = vi.fn(() => ({ deny: ["read"] }));
     channelPluginMocks.getLoadedChannelPlugin.mockReturnValue({
diff --git a/src/media/read-capability.ts b/src/media/read-capability.ts
index 4da71b6e6d0b..a8f955605ab3 100644
--- a/src/media/read-capability.ts
+++ b/src/media/read-capability.ts
@@ -3,17 +3,17 @@ import path from "node:path";
 import { resolveAgentWorkspaceDir } from "../agents/agent-scope.js";
 import { resolveGroupToolPolicy } from "../agents/agent-tools.policy.js";
 import { resolvePathFromInput } from "../agents/path-policy.js";
+import { resolveManagedMediaRoot } from "../agents/sandbox-paths.js";
+import { resolveSenderToolPolicy } from "../agents/sender-tool-policy.js";
 import { resolveEffectiveToolFsRootExpansionAllowed } from "../agents/tool-fs-policy.js";
 import { isToolAllowedByPolicies } from "../agents/tool-policy-match.js";
 import { resolveWorkspaceRoot } from "../agents/workspace-dir.js";
 import type { OpenClawConfig } from "../config/types.openclaw.js";
+import { resolveConfigDir } from "../utils.js";
 import { createBoundedOutboundMediaReadFile } from "./bounded-read-file.js";
 import type { OutboundMediaAccess, OutboundMediaReadFile } from "./load-options.js";
 import { readLocalMediaFile } from "./local-media-access.js";
-import {
-  getAgentScopedMediaLocalRoots,
-  getAgentScopedMediaLocalRootsForSources,
-} from "./local-roots.js";
+import { getAgentScopedMediaLocalRootsForSources } from "./local-roots.js";
 
 type OutboundHostMediaPolicyContext = {
   sessionKey?: string;
@@ -28,20 +28,12 @@ type OutboundHostMediaPolicyContext = {
   requesterSenderE164?: string | null;
 };
 
-function isAgentScopedHostMediaReadAllowed(
+function isAgentScopedMediaReadAllowedByToolPolicy(
   params: {
     cfg: OpenClawConfig;
     agentId?: string;
   } & OutboundHostMediaPolicyContext,
 ): boolean {
-  if (
-    !resolveEffectiveToolFsRootExpansionAllowed({
-      cfg: params.cfg,
-      agentId: params.agentId,
-    })
-  ) {
-    return false;
-  }
   const groupPolicy = resolveGroupToolPolicy({
     config: params.cfg,
     sessionKey: params.sessionKey,
@@ -55,8 +47,17 @@ function isAgentScopedHostMediaReadAllowed(
     senderUsername: params.requesterSenderUsername,
     senderE164: params.requesterSenderE164,
   });
-  // Sender/group policy only applies when a concrete group override exists.
-  if (groupPolicy && !isToolAllowedByPolicies("read", [groupPolicy])) {
+  const senderPolicy = resolveSenderToolPolicy({
+    config: params.cfg,
+    agentId: params.agentId,
+    sessionKey: params.sessionKey,
+    messageProvider: params.messageProvider,
+    senderId: params.requesterSenderId,
+    senderName: params.requesterSenderName,
+    senderUsername: params.requesterSenderUsername,
+    senderE164: params.requesterSenderE164,
+  });
+  if (!isToolAllowedByPolicies("read", [groupPolicy, senderPolicy])) {
     return false;
   }
   return true;
@@ -71,7 +72,13 @@ function createAgentScopedHostMediaReadFile(
     workspaceDir?: string;
   } & OutboundHostMediaPolicyContext,
 ): OutboundMediaReadFile | undefined {
-  if (!isAgentScopedHostMediaReadAllowed(params)) {
+  if (
+    !resolveEffectiveToolFsRootExpansionAllowed({
+      cfg: params.cfg,
+      agentId: params.agentId,
+    }) ||
+    !isAgentScopedMediaReadAllowedByToolPolicy(params)
+  ) {
     return undefined;
   }
   const inferredWorkspaceDir =
@@ -86,6 +93,17 @@ function createAgentScopedHostMediaReadFile(
   });
 }
 
+function getManagedMediaLocalRoots(mediaSources?: readonly string[]): readonly string[] {
+  const roots = new Set([path.join(resolveConfigDir(), "media", "outbound")]);
+  for (const source of mediaSources ?? []) {
+    const managedRoot = resolveManagedMediaRoot(source);
+    if (managedRoot) {
+      roots.add(managedRoot);
+    }
+  }
+  return Array.from(roots);
+}
+
 function appendWorkspaceDirToLocalRoots(
   roots: readonly string[] | undefined,
   workspaceDir?: string,
@@ -118,39 +136,38 @@ export function resolveAgentScopedOutboundMediaAccess(
     params.workspaceDir ??
     params.mediaAccess?.workspaceDir ??
     (params.agentId ? resolveAgentWorkspaceDir(params.cfg, params.agentId) : undefined);
-  const hostMediaReadAllowed = isAgentScopedHostMediaReadAllowed(params);
-  // Even when host reads are denied, keep base roots so generated media remains addressable.
-  const baseLocalRoots =
-    params.mediaAccess?.localRoots ??
-    (hostMediaReadAllowed
-      ? getAgentScopedMediaLocalRootsForSources({
-          cfg: params.cfg,
-          agentId: params.agentId,
-          mediaSources: params.mediaSources,
-        })
-      : getAgentScopedMediaLocalRoots(params.cfg, params.agentId));
-  const localRoots = appendWorkspaceDirToLocalRoots(baseLocalRoots, resolvedWorkspaceDir);
-  const readFile =
-    params.mediaAccess?.readFile ??
-    params.mediaReadFile ??
-    (hostMediaReadAllowed
-      ? createAgentScopedHostMediaReadFile({
-          cfg: params.cfg,
-          agentId: params.agentId,
-          localRoots: localRoots ?? [],
-          workspaceDir: resolvedWorkspaceDir,
-          sessionKey: params.sessionKey,
-          messageProvider: params.messageProvider,
-          groupId: params.groupId,
-          groupChannel: params.groupChannel,
-          groupSpace: params.groupSpace,
-          accountId: params.accountId,
-          requesterSenderId: params.requesterSenderId,
-          requesterSenderName: params.requesterSenderName,
-          requesterSenderUsername: params.requesterSenderUsername,
-          requesterSenderE164: params.requesterSenderE164,
-        })
-      : undefined);
+  const mediaReadAllowed = isAgentScopedMediaReadAllowedByToolPolicy(params);
+  const baseLocalRoots = mediaReadAllowed
+    ? (params.mediaAccess?.localRoots ??
+      getAgentScopedMediaLocalRootsForSources({
+        cfg: params.cfg,
+        agentId: params.agentId,
+        mediaSources: params.mediaSources,
+      }))
+    : getManagedMediaLocalRoots(params.mediaSources);
+  const localRoots = mediaReadAllowed
+    ? appendWorkspaceDirToLocalRoots(baseLocalRoots, resolvedWorkspaceDir)
+    : baseLocalRoots;
+  const readFile = mediaReadAllowed
+    ? (params.mediaAccess?.readFile ??
+      params.mediaReadFile ??
+      createAgentScopedHostMediaReadFile({
+        cfg: params.cfg,
+        agentId: params.agentId,
+        localRoots: localRoots ?? [],
+        workspaceDir: resolvedWorkspaceDir,
+        sessionKey: params.sessionKey,
+        messageProvider: params.messageProvider,
+        groupId: params.groupId,
+        groupChannel: params.groupChannel,
+        groupSpace: params.groupSpace,
+        accountId: params.accountId,
+        requesterSenderId: params.requesterSenderId,
+        requesterSenderName: params.requesterSenderName,
+        requesterSenderUsername: params.requesterSenderUsername,
+        requesterSenderE164: params.requesterSenderE164,
+      }))
+    : undefined;
   return {
     ...(localRoots?.length ? { localRoots } : {}),
     ...(readFile ? { readFile } : {}),