fix: route Exa and CodeGraph through shared mcp adapter

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"]);
+});