diff --git a/src/gateway/http-common.ts b/src/gateway/http-common.ts
index 993a3ac36..b7e9c1db4 100644
--- a/src/gateway/http-common.ts
+++ b/src/gateway/http-common.ts
@@ -25,6 +25,12 @@ export function sendUnauthorized(res: ServerResponse) {
   });
 }
 
+export function sendForbidden(res: ServerResponse, message: string) {
+  sendJson(res, 403, {
+    error: { message, type: "forbidden" },
+  });
+}
+
 export function sendInvalidRequest(res: ServerResponse, message: string) {
   sendJson(res, 400, {
     error: { message, type: "invalid_request_error" },
diff --git a/src/gateway/tools-invoke-http.ts b/src/gateway/tools-invoke-http.ts
index fa45bf3dc..663ebd3bb 100644
--- a/src/gateway/tools-invoke-http.ts
+++ b/src/gateway/tools-invoke-http.ts
@@ -7,6 +7,8 @@ import {
   resolveGroupToolPolicy,
   resolveSubagentToolPolicy,
 } from "../agents/pi-tools.policy.js";
+import { resolveSandboxRuntimeStatus } from "../agents/sandbox.js";
+import { isToolAllowed } from "../agents/sandbox/tool-policy.js";
 import {
   buildPluginToolGroups,
   collectExplicitAllowlist,
@@ -26,6 +28,7 @@ import { authorizeGatewayConnect, type ResolvedGatewayAuth } from "./auth.js";
 import { getBearerToken, getHeader } from "./http-utils.js";
 import {
   readJsonBodyOrError,
+  sendForbidden,
   sendInvalidRequest,
   sendJson,
   sendMethodNotAllowed,
@@ -116,6 +119,18 @@ export async function handleToolsInvokeHttpRequest(
   const sessionKey =
     !rawSessionKey || rawSessionKey === "main" ? resolveMainSessionKey(cfg) : rawSessionKey;
 
+  // Check sandbox policy before proceeding. Sandboxed sessions have restricted tool access.
+  const sandboxRuntime = resolveSandboxRuntimeStatus({ cfg, sessionKey });
+  if (sandboxRuntime.sandboxed) {
+    if (!isToolAllowed(sandboxRuntime.toolPolicy, toolName)) {
+      sendForbidden(
+        res,
+        `Tool "${toolName}" is blocked by sandbox policy (mode=${sandboxRuntime.mode}, session=${sessionKey})`,
+      );
+      return true;
+    }
+  }
+
   // Resolve message channel/account hints (optional headers) for policy inheritance.
   const messageChannel = normalizeMessageChannel(getHeader(req, "x-moltbot-message-channel") ?? "");
   const accountId = getHeader(req, "x-moltbot-account-id")?.trim() || undefined;