diff --git a/apps/desktop/electron/main/plugin-mcp.ts b/apps/desktop/electron/main/plugin-mcp.ts
index aa5fbfd4d4..dfa93f2e66 100644
--- a/apps/desktop/electron/main/plugin-mcp.ts
+++ b/apps/desktop/electron/main/plugin-mcp.ts
@@ -48,7 +48,7 @@ export type JsonRpcMessage = {
  * the client speak the same JSON-RPC dialect over a pipe or over HTTP.
  */
 export type McpTransport = {
-  send: (message: JsonRpcMessage) => Promise<void>;
+  send: (message: JsonRpcMessage, timeoutMs?: number) => Promise<void>;
   close: () => void;
 };
 
@@ -297,11 +297,11 @@ function createHttpTransport(
   const activeControllers = new Set<AbortController>();
 
   return {
-    send: async (message) => {
+    send: async (message, timeoutMs = options.timeoutMs) => {
       if (closed) throw mcpError("UNAVAILABLE", "mcp session is closed");
       const controller = new AbortController();
       activeControllers.add(controller);
-      const timer = setTimeout(() => controller.abort(), options.timeoutMs);
+      const timer = setTimeout(() => controller.abort(), timeoutMs);
       let url = options.url;
       try {
         for (let hop = 0; ; hop += 1) {
@@ -651,7 +651,7 @@ export class McpServerClient {
         rejectPromise(mcpError("TIMEOUT", `mcp ${method} timed out after ${timeoutMs}ms`));
       }, timeoutMs);
       this.pending.set(id, { resolve: resolvePromise, reject: rejectPromise, timer });
-      void transport.send({ jsonrpc: "2.0", id, method, params }).catch((error: Error) => {
+      void transport.send({ jsonrpc: "2.0", id, method, params }, timeoutMs).catch((error: Error) => {
         const entry = this.pending.get(id);
         if (!entry) return;
         this.pending.delete(id);
diff --git a/apps/desktop/test/plugin-mcp.test.mjs b/apps/desktop/test/plugin-mcp.test.mjs
index 2d55608806..3082748a80 100644
--- a/apps/desktop/test/plugin-mcp.test.mjs
+++ b/apps/desktop/test/plugin-mcp.test.mjs
@@ -262,7 +262,7 @@ test("a slow server times out instead of hanging the load", async (t) => {
 });
 
 /** Streamable-HTTP stub: JSON for the handshake, SSE for discovery. */
-async function startHttpServer(t) {
+async function startHttpServer(t, { slowToolDelayMs } = {}) {
   const requests = [];
   const server = createServer((req, res) => {
     const chunks = [];
@@ -291,7 +291,7 @@ async function startHttpServer(t) {
           `event: message\ndata: ${JSON.stringify({
             jsonrpc: "2.0",
             id: message.id,
-            result: { tools: [{ name: "headers" }] },
+            result: { tools: [{ name: "headers" }, ...(slowToolDelayMs ? [{ name: "slow" }] : [])] },
           })}\n\n`,
         );
         return;
@@ -314,6 +314,17 @@ async function startHttpServer(t) {
         );
         return;
       }
+      if (message.params?.name === "slow" && slowToolDelayMs) {
+        setTimeout(() => {
+          res.writeHead(200, { "content-type": "application/json" });
+          res.end(JSON.stringify({
+            jsonrpc: "2.0",
+            id: message.id,
+            result: { content: [{ type: "text", text: "finished" }] },
+          }));
+        }, slowToolDelayMs);
+        return;
+      }
       res.writeHead(503).end("unavailable");
     });
   });
@@ -347,6 +358,22 @@ test("a remote mcp server negotiates over http and keeps its session", async (t)
   assert.equal(requests.at(-1).headers["mcp-session-id"], "sess-42");
 });
 
+test("a remote MCP tool can run longer than the connection timeout", async (t) => {
+  const { url } = await startHttpServer(t, { slowToolDelayMs: 80 });
+  const client = new McpServerClient({
+    rootPath: mkdtempSync(join(tmpdir(), "pi-mcp-http-")),
+    server: { id: "remote", transport: "http", url },
+    values: {},
+    connectTimeoutMs: 20,
+    callTimeoutMs: 500,
+  });
+  t.after(() => client.close());
+
+  assert.deepEqual((await client.connect()).map((tool) => tool.name), ["headers", "slow"]);
+  const result = await client.callTool("slow", {});
+  assert.equal(describeMcpContent(result.content), "finished");
+});
+
 test("an http failure is reported as HTTP_ERROR", async (t) => {
   const { url } = await startHttpServer(t);
   const client = new McpServerClient({
diff --git a/docs/spec/06-delivery/04-e2e-test-plan.md b/docs/spec/06-delivery/04-e2e-test-plan.md
index 5ffa65dbff..c0c86e58b2 100644
--- a/docs/spec/06-delivery/04-e2e-test-plan.md
+++ b/docs/spec/06-delivery/04-e2e-test-plan.md
@@ -2769,8 +2769,8 @@ identify the platform validation still needed.
 #### E2E-024K: Plugin MCP server tools reach the agent
 
 - **Preconditions**: A plugin declaring one `stdio` and one non-loopback HTTP MCP server against trusted local-network stubs; `mcp.server.local` and `mcp.server.remote` granted; the HTTP host is listed in `net.domains`; a settings key holding the stub credential.
-- **Steps**: 1) Enable the plugin and confirm no server process starts yet. 2) Ask the agent to call a discovered tool. 3) Inspect the stub's received environment/headers. 4) Make the stub fail a call and time one out. 5) Grow the stdio stub's catalog past the old 64-tool cap and re-discover it. 6) Disable the plugin.
-- **Expected**: Servers connect lazily on first use; tools appear as `plugin_demo_*_<serverId>_<tool>` at `risk: "medium"` with per-call audit; the stdio child receives only the declared `env` values plus PATH/temp/locale, never host provider keys; the non-loopback HTTP endpoint is accepted only because its host is declared, and its unencrypted transport is visible in review; a redirect to an undeclared host is blocked before the second request; failures and timeouts return tool errors without crashing the plugin or the host; a catalog larger than the old 64-tool cap arrives whole, while a server that breaks a per-server guard (count, pages, cursor, traversal time) is refused instead of contributing a prefix of its catalog; disable disconnects both servers.
+- **Steps**: 1) Enable the plugin and confirm no server process starts yet. 2) Ask the agent to call a discovered tool. 3) Inspect the stub's received environment/headers. 4) Make the stub fail a call, then run an HTTP tool that takes longer than the 10s handshake budget but less than the 100s call budget, then time a call out beyond its own budget. 5) Grow the stdio stub's catalog past the old 64-tool cap and re-discover it. 6) Disable the plugin.
+- **Expected**: Servers connect lazily on first use; tools appear as `plugin_demo_*_<serverId>_<tool>` at `risk: "medium"` with per-call audit; the stdio child receives only the declared `env` values plus PATH/temp/locale, never host provider keys; the non-loopback HTTP endpoint is accepted only because its host is declared, and its unencrypted transport is visible in review; a redirect to an undeclared host is blocked before the second request; the HTTP tool can finish after the handshake budget while a call that exceeds its own budget fails; other failures and timeouts return tool errors without crashing the plugin or the host; a catalog larger than the old 64-tool cap arrives whole, while a server that breaks a per-server guard (count, pages, cursor, traversal time) is refused instead of contributing a prefix of its catalog; disable disconnects both servers.
 - **Specs linked**: `07-plugins/02-plugin-manifest-schema.md`, `07-plugins/04-plugin-security.md` §8.1, ADR 0038, ADR 0142, D176, D281, D452
 - **Acceptance**: G (MCP bridge) + E (tools & permissions) + Security
 - **Status**: Unit-covered (`plugin-mcp.test.mjs` stdio + HTTP stubs); agent-facing scenario Draft
diff --git a/docs/spec/07-plugins/04-plugin-security.md b/docs/spec/07-plugins/04-plugin-security.md
index f9ca2221ae..ffaac8bc16 100644
--- a/docs/spec/07-plugins/04-plugin-security.md
+++ b/docs/spec/07-plugins/04-plugin-security.md
@@ -366,7 +366,9 @@ manifest did not name:
   literal secret in the manifest is a review smell, not a supported pattern
   (D018).
 - Connection budget: 10s to complete `initialize`, 100s per `tools/call`, 4MB
-  per stdio line. `tools/list` is followed to its last page under the per-server
+  per stdio line. Remote HTTP requests use the budget of the operation they
+  carry, so a successful handshake does not impose its 10s limit on a later
+  tool call. `tools/list` is followed to its last page under the per-server
   guards of §8.1 — 2048 tools, 100 pages, a cursor that repeats or is malformed,
   and 30s for the whole traversal — and a server that breaks one is refused
   rather than contributing a prefix of its catalog, because MCP tools reach the
diff --git a/docs/zh-CN/spec/06-delivery/04-e2e-test-plan.md b/docs/zh-CN/spec/06-delivery/04-e2e-test-plan.md
index 434b3daef2..58176c5f0b 100644
--- a/docs/zh-CN/spec/06-delivery/04-e2e-test-plan.md
+++ b/docs/zh-CN/spec/06-delivery/04-e2e-test-plan.md
@@ -1386,8 +1386,8 @@ task-candidate E2E 从请求工作树运行，但使用主工作区已经准备
 #### E2E-024K：插件 MCP 服务器工具到达代理
 
 - **先决条件**：针对可信局域网存根声明一个 `stdio` 和一个非回环 HTTP MCP 服务器的插件；已授予 `mcp.server.local` 和 `mcp.server.remote`；HTTP 主机已列入 `net.domains`；保存存根凭证的设置密钥。
-- **步骤**： 1) 启用插件并确认尚未启动服务器进程。 2) 要求代理调用已发现的工具。 3) 检查存根收到的 environment/headers。 4) 使存根调用失败并超时。 5) 让 stdio 存根的目录超过旧的 64 个工具上限并重新发现。 6) 禁用插件。
-- **预期**：服务器在首次使用时延迟连接；工具在 `risk: "medium"` 上显示为 `plugin_demo_*_<serverId>_<tool>`，并进行每次调用审核；stdio 子级仅接收声明的 `env` 值加上 PATH/temp/locale，从不接收主机提供程序密钥；非回环 HTTP 端点只有在主机列入白名单后才会接受，未加密传输会在审查中显示；跳转到未声明主机时会在第二次请求前阻止；失败和超时会返回工具错误，而不会导致插件或主机崩溃；大于旧的 64 个工具上限的目录会完整到达，而突破某项每服务器护栏（数量、页数、游标、遍历时间）的服务器会被拒绝，而不是贡献其目录的一个前缀；禁用会断开两个服务器的连接。
+- **步骤**： 1) 启用插件并确认尚未启动服务器进程。 2) 要求代理调用已发现的工具。 3) 检查存根收到的 environment/headers。 4) 使存根调用失败，再执行耗时超过 10 秒握手预算但少于 100 秒调用预算的 HTTP 工具，最后让另一次调用超过自身预算。 5) 让 stdio 存根的目录超过旧的 64 个工具上限并重新发现。 6) 禁用插件。
+- **预期**：服务器在首次使用时延迟连接；工具在 `risk: "medium"` 上显示为 `plugin_demo_*_<serverId>_<tool>`，并进行每次调用审核；stdio 子级仅接收声明的 `env` 值加上 PATH/temp/locale，从不接收主机提供程序密钥；非回环 HTTP 端点只有在主机列入白名单后才会接受，未加密传输会在审查中显示；跳转到未声明主机时会在第二次请求前阻止；HTTP 工具可在握手预算之后完成，超过自身预算的调用失败；其他失败和超时会返回工具错误，而不会导致插件或主机崩溃；大于旧的 64 个工具上限的目录会完整到达，而突破某项每服务器护栏（数量、页数、游标、遍历时间）的服务器会被拒绝，而不是贡献其目录的一个前缀；禁用会断开两个服务器的连接。
 - **链接规格**：`07-plugins/02-plugin-manifest-schema.md`、`07-plugins/04-plugin-security.md` §8.1、ADR 0038、ADR 0142、D176、D281、D452
 - **接受**：G（MCP 桥）+ E（工具和权限）+ 安全
 - **状态**：单位覆盖（`plugin-mcp.test.mjs` stdio + HTTP 存根）；面向代理的场景草稿
diff --git a/docs/zh-CN/spec/07-plugins/04-plugin-security.md b/docs/zh-CN/spec/07-plugins/04-plugin-security.md
index ed83393f6a..0622d7d6af 100644
--- a/docs/zh-CN/spec/07-plugins/04-plugin-security.md
+++ b/docs/zh-CN/spec/07-plugins/04-plugin-security.md
@@ -285,7 +285,7 @@ MCP 服务器是 `net.fetch` 旁边的第二个出口路径，因此它是声明
   清单中的字面秘密是审查气味，而不是受支持的模式
   （D018）。
 - 连接预算：完成 `initialize` 需要 10 秒，每个 `tools/call` 需要 100 秒，每条
-  stdio 线 4MB。`tools/list` 在 §8.1 的每服务器护栏下跟进到最后一页
+  stdio 线 4MB。远程 HTTP 请求采用其对应操作的预算；完成握手后，后续工具调用不会继续受 10 秒握手预算限制。`tools/list` 在 §8.1 的每服务器护栏下跟进到最后一页
   ——2048 个工具、100 页、重复或畸形游标、整轮遍历 30 秒——突破任一护栏的服务器会被
   拒绝，而不是贡献其目录的一个前缀，因为 MCP 工具是以延迟加载的按需条目
   （`ToolSearch` 之后）而非常驻列表的形式到达模型的。服务器按需连接，