fix: route Exa and CodeGraph through shared mcp adapter

AGENTS.md

@@ -15,10 +15,9 @@
 - `extensions/fff-override.ts`：强制使用 FFF 官方 `override` 模式，统一接管 `find`、`grep`、`multi_grep` 和 FFF 的 `@` 补全；显式 CLI flag 仍遵循 FFF 官方优先级。
 - `extensions/tavily-override.ts`：加载 `@tavily/pi-extension`，把上游工具重命名为 `tavily_web_search` / `tavily_web_fetch`，并同步改写 label 与工具提示中的内部名称。
 - `@keenable/pi-search`：加载 `keenable_search` / `keenable_fetch` 及其 skill，默认 keyless，`KEENABLE_API_KEY` 仅用于提高速率限制。
-- `extensions/exa.ts`：通过隔离的 `pi-mcp-adapter` 配置连接 Exa 托管 MCP，把原始工具名映射为统一的来源前缀形式 `exa_web_search`、`exa_web_fetch` 和 `exa_web_search_advanced`。
+- `extensions/mcp.ts`：通过单个共享 `pi-mcp-adapter` 实例同时连接 Exa 托管 MCP 与机器现有的 `codegraph serve --mcp`，避免重复注册 Pi 的全局 MCP flag 与命令；Exa 原始工具映射为统一的来源前缀形式 `exa_web_search`、`exa_web_fetch` 和 `exa_web_search_advanced`，CodeGraph 只暴露 `codegraph_explore`。
 - `context-mode`：加载上游 Pi adapter 与 skills，提供 `ctx_*` 工具、隔离式大输出处理和会话连续性。
 - `extensions/hashline.ts`：部署组合包权威 `config/pi-hashline-edit.json` 后加载 `pi-hashline-edit`，以行哈希锚点覆盖内置 `read` / `edit`；Hashline 自带 `grep` 强制关闭。
-- `extensions/codegraph.ts`：通过隔离的 `pi-mcp-adapter` 配置连接机器现有的 `codegraph serve --mcp`，只暴露 `codegraph_explore`。
 - `extensions/permission-system.ts`：在权限扩展注册前，将 `config/pi-permission-system.json` 同步为全局权威配置。
 - `extensions/lsp.ts`：把组合包内 TypeScript Language Server CLI 物化为绝对命令路径，部署 TypeScript/Kotlin/JDT LS 全局配置并加载 `pi-lsp`。
 - `extensions/tool-routing.ts`：保留 Pi 默认系统提示词，在每轮开始前按激活工具追加简短路由规则，并提供 `/dump-system-prompt` 将扩展所见的有效提示词写入 `.pi-debug/effective-system-prompt.md`。

README.md

@@ -7,7 +7,7 @@
 - `context-mode@1.0.169`：通过 Pi adapter 提供 `ctx_*` 工具、上下文隔离和会话连续性。
 - `@tavily/pi-extension@0.1.2`：提供 Tavily 广泛搜索与页面提取；通过本地 override 暴露为 `tavily_web_search` / `tavily_web_fetch`。
 - `@keenable/pi-search@0.1.2`：提供紧凑的 `keenable_search` / `keenable_fetch`，并加载其搜索 skill；API key 可选。
-- `pi-mcp-adapter@2.26.0`：分别用隔离配置接入机器现有的 CodeGraph 和 Exa 托管 MCP。
+- `pi-mcp-adapter@2.26.0`：通过单个共享 adapter 实例接入机器现有的 CodeGraph 和 Exa 托管 MCP，避免重复注册 Pi 的全局 MCP flag 与命令。
 - `pi-context-view@0.4.2`：查看上下文占用。
 - `@firstpick/pi-extension-codex-fast-mode@0.1.1`：为 Codex provider 提供会话级 `/fast-mode`。
 - `pi-lsp@0.1.7`：为 TypeScript/JavaScript、Kotlin 和 Java 提供 LSP 诊断、跳转与符号工具；TypeScript 后端由组合包内置。
@@ -159,11 +159,11 @@ Tavily 通过 `extensions/tavily-override.ts` 加载官方扩展。override 只
 
 Keenable 直接加载 npm 包的扩展和 skill，默认无需 key；设置 `KEENABLE_API_KEY` 可提高速率限制。它适合中文内容、`site` 限定和发布日期筛选。搜索结果保持紧凑，只对选中的 URL 调用 `keenable_fetch`。
 
-`extensions/exa.ts` 通过已有的 `pi-mcp-adapter` 连接 `https://mcp.exa.ai/mcp`，把 MCP 原始工具映射为统一的来源前缀形式：`exa_web_search`、`exa_web_fetch` 和 `exa_web_search_advanced`。Exa 适合官方文档、技术资料、版本信息和论文；高级搜索必须显式限制结果数量与返回文本长度，避免响应过大。
+`extensions/mcp.ts` 通过单个 `pi-mcp-adapter` 实例同时连接 Exa 与 CodeGraph，避免两个 adapter 重复注册 `--mcp-config`、`/mcp` 和 `/mcp-auth`。其中 Exa 连接 `https://mcp.exa.ai/mcp`，并把 MCP 原始工具映射为统一的来源前缀形式：`exa_web_search`、`exa_web_fetch` 和 `exa_web_search_advanced`。Exa 适合官方文档、技术资料、版本信息和论文；高级搜索必须显式限制结果数量与返回文本长度，避免响应过大。
 
 ### CodeGraph 只负责连接
 
-`extensions/codegraph.ts` 使用隔离的 `pi-mcp-adapter` 配置启动
+同一个 `extensions/mcp.ts` adapter 配置启动
 `codegraph serve --mcp`，不会读取或覆盖用户已有的 MCP 配置。连接采用
 `keep-alive`，并只把官方当前主工具 `codegraph_explore` 作为同名 Pi 工具暴露；
 CodeGraph 的文件 watcher 由该 MCP 进程自身维护。

extensions/codegraph.ts

@@ -1,23 +0,0 @@
-import { createMcpAdapter } from "pi-mcp-adapter";
-
-/** Connect Pi to the CodeGraph MCP server provided by the host machine. */
-export default createMcpAdapter({
-	config: {
-		settings: {
-			disableProxyTool: true,
-			scriptMode: false,
-		},
-		mcpServers: {
-			codegraph: {
-				command: "codegraph",
-				args: ["serve", "--mcp"],
-				lifecycle: "keep-alive",
-				directTools: ["codegraph_explore"],
-				includeTools: ["codegraph_explore"],
-				toolPrefix: "none",
-				approveTools: false,
-				exposeResources: false,
-			},
-		},
-	},
-});

extensions/exa.ts

@@ -1,32 +0,0 @@
-import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
-import { createMcpAdapter } from "pi-mcp-adapter";
-import { createExaToolApiOverride } from "./exa-tool-prefix.ts";
-
-const EXA_TOOLS = ["web_search_exa", "web_fetch_exa", "web_search_advanced_exa"];
-const EXA_MCP_URL = `https://mcp.exa.ai/mcp?tools=${EXA_TOOLS.join(",")}`;
-
-const exaAdapter = createMcpAdapter({
-	config: {
-		settings: {
-			disableProxyTool: true,
-			scriptMode: false,
-		},
-		mcpServers: {
-			exa: {
-				url: EXA_MCP_URL,
-				protocolVersion: "auto",
-				lifecycle: "eager",
-				directTools: EXA_TOOLS,
-				includeTools: EXA_TOOLS,
-				toolPrefix: "none",
-				approveTools: false,
-				exposeResources: false,
-			},
-		},
-	},
-});
-
-/** Connect Pi to Exa while exposing every direct tool as `exa_<original-name>`. */
-export default function exaExtension(pi: ExtensionAPI): void {
-	exaAdapter(createExaToolApiOverride(pi));
-}

extensions/mcp-config.ts

@@ -0,0 +1,33 @@
+import type { McpConfig } from "pi-mcp-adapter";
+
+export const EXA_TOOLS = ["web_search_exa", "web_fetch_exa", "web_search_advanced_exa"];
+const EXA_MCP_URL = `https://mcp.exa.ai/mcp?tools=${EXA_TOOLS.join(",")}`;
+
+export const MCP_CONFIG: McpConfig = {
+	settings: {
+		disableProxyTool: true,
+		scriptMode: false,
+	},
+	mcpServers: {
+		exa: {
+			url: EXA_MCP_URL,
+			protocolVersion: "auto",
+			lifecycle: "eager",
+			directTools: EXA_TOOLS,
+			includeTools: EXA_TOOLS,
+			toolPrefix: "none",
+			approveTools: false,
+			exposeResources: false,
+		},
+		codegraph: {
+			command: "codegraph",
+			args: ["serve", "--mcp"],
+			lifecycle: "keep-alive",
+			directTools: ["codegraph_explore"],
+			includeTools: ["codegraph_explore"],
+			toolPrefix: "none",
+			approveTools: false,
+			exposeResources: false,
+		},
+	},
+};

extensions/mcp.ts

@@ -0,0 +1,13 @@
+import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
+import { createMcpAdapter } from "pi-mcp-adapter";
+import { createExaToolApiOverride } from "./exa-tool-prefix.ts";
+import { MCP_CONFIG } from "./mcp-config.ts";
+
+const mcpAdapter = createMcpAdapter({
+	config: MCP_CONFIG,
+});
+
+/** Connect Pi to Exa and CodeGraph through one shared MCP adapter instance. */
+export default function mcpExtension(pi: ExtensionAPI): void {
+	mcpAdapter(createExaToolApiOverride(pi));
+}

package.json

@@ -25,11 +25,10 @@
       "./extensions/fff-override.ts",
       "./extensions/tavily-override.ts",
       "./node_modules/@keenable/pi-search/src/index.ts",
-      "./extensions/exa.ts",
+      "./extensions/mcp.ts",
       "./pi-rtk-optimizer/index.ts",
       "./extensions/hashline.ts",
       "./node_modules/context-mode/build/adapters/pi/extension.js",
-      "./extensions/codegraph.ts",
       "./extensions/lsp.ts",
       "./node_modules/pi-context-view/src/index.ts",
       "./node_modules/@firstpick/pi-extension-codex-fast-mode/index.ts",

tests/exa-override.test.ts

@@ -32,11 +32,14 @@ test("Exa API override keeps registered and active tool names aligned", () => {
 	});
 
 	api.registerTool({ name: "web_fetch_exa", label: "MCP: web_fetch_exa" });
-	api.setActiveTools(["read", "web_fetch_exa", "web_fetch_exa"]);
+	api.registerTool({ name: "codegraph_explore", label: "MCP: codegraph_explore" });
+	api.setActiveTools(["read", "web_fetch_exa", "web_fetch_exa", "codegraph_explore"]);
 	api.unregisterTool("web_fetch_exa");
+	api.unregisterTool("codegraph_explore");
 
 	assert.equal(registered[0]?.name, "exa_web_fetch");
 	assert.equal(registered[0]?.label, "Exa Web Fetch");
-	assert.deepEqual(active, ["read", "exa_web_fetch"]);
+	assert.equal(registered[1]?.name, "codegraph_explore");
-	assert.deepEqual(unregistered, ["exa_web_fetch"]);
+	assert.deepEqual(active, ["read", "exa_web_fetch", "codegraph_explore"]);
+	assert.deepEqual(unregistered, ["exa_web_fetch", "codegraph_explore"]);
 });

tests/mcp.test.ts

@@ -0,0 +1,47 @@
+import assert from "node:assert/strict";
+import { readFile } from "node:fs/promises";
+import test from "node:test";
+
+import { EXA_TOOLS, MCP_CONFIG } from "../extensions/mcp-config.ts";
+
+test("one MCP adapter config contains both Exa and CodeGraph", () => {
+	assert.deepEqual(MCP_CONFIG, {
+		settings: {
+			disableProxyTool: true,
+			scriptMode: false,
+		},
+		mcpServers: {
+			exa: {
+				url: `https://mcp.exa.ai/mcp?tools=${EXA_TOOLS.join(",")}`,
+				protocolVersion: "auto",
+				lifecycle: "eager",
+				directTools: EXA_TOOLS,
+				includeTools: EXA_TOOLS,
+				toolPrefix: "none",
+				approveTools: false,
+				exposeResources: false,
+			},
+			codegraph: {
+				command: "codegraph",
+				args: ["serve", "--mcp"],
+				lifecycle: "keep-alive",
+				directTools: ["codegraph_explore"],
+				includeTools: ["codegraph_explore"],
+				toolPrefix: "none",
+				approveTools: false,
+				exposeResources: false,
+			},
+		},
+	});
+});
+
+test("the package loads only the shared MCP extension entry", async () => {
+	const packageJson = JSON.parse(await readFile(new URL("../package.json", import.meta.url), "utf8")) as {
+		pi: { extensions: string[] };
+	};
+	const localMcpEntries = packageJson.pi.extensions.filter((entry) =>
+		entry === "./extensions/mcp.ts" || entry === "./extensions/exa.ts" || entry === "./extensions/codegraph.ts"
+	);
+
+	assert.deepEqual(localMcpEntries, ["./extensions/mcp.ts"]);
+});