From 9c5d8172dc1713d9c5618618db7da05cc96f14da Mon Sep 17 00:00:00 2001 From: Robert Date: Mon, 11 May 2026 20:33:54 -0300 Subject: [PATCH] initial: @a2a/mcp gateway for a2acloud agents Local MCP server that exposes any number of deployed A2A agents to Claude Code, Cursor, Windsurf, and other MCP clients. Reuses the ~/.a2a/credentials.json token written by the Python a2a CLI. Adding or removing agents is a single ~/.a2a/mcp.json edit. Co-Authored-By: Claude Opus 4.7 (1M context) --- .gitignore | 7 + package-lock.json | 1733 +++++++++++++++++++++++++++++++++++++++++ package.json | 34 + src/api.ts | 81 ++ src/cli.ts | 242 ++++++ src/config.ts | 62 ++ src/credentials.ts | 61 ++ src/gateway.ts | 128 +++ src/index.ts | 16 + src/upstream.ts | 96 +++ tests/config.test.ts | 46 ++ tests/gateway.test.ts | 211 +++++ tsconfig.json | 21 + 13 files changed, 2738 insertions(+) create mode 100644 .gitignore create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 src/api.ts create mode 100644 src/cli.ts create mode 100644 src/config.ts create mode 100644 src/credentials.ts create mode 100644 src/gateway.ts create mode 100644 src/index.ts create mode 100644 src/upstream.ts create mode 100644 tests/config.test.ts create mode 100644 tests/gateway.test.ts create mode 100644 tsconfig.json diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..b56b767 --- /dev/null +++ b/.gitignore @@ -0,0 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Run as a local MCP server; expose any number of deployed A2A agents to Claude Code, Cursor, and other MCP clients.", + "type": "module", + "bin": { + "a2a-mcp": "dist/cli.js" + }, + "main": "dist/index.js", + "types": "dist/index.d.ts", + "files": [ + "dist", + "README.md" + ], + "engines": { + "node": ">=18.17" + }, + "scripts": { + "build": "tsc -p tsconfig.json", + "prepare": "npm run build", + "test": "node --test --import tsx tests/*.test.ts", + "dev": "tsx src/cli.ts" + }, + "dependencies": { + "@modelcontextprotocol/sdk": "^1.0.4", + "commander": "^12.1.0" + }, + "devDependencies": { + "@types/node": "^20.12.0", + "tsx": "^4.19.0", + "typescript": "^5.5.0" + }, + "license": "Apache-2.0" +} diff --git a/src/api.ts b/src/api.ts new file mode 100644 index 0000000..008ad37 --- /dev/null +++ b/src/api.ts @@ -0,0 +1,81 @@ +/** + * Thin control-plane client. Mirrors the relevant subset of + * a2a_pack.cli.api_client.ControlPlaneClient. + */ +export class ApiError extends Error { + constructor(public status: number, message: string) { + super(`API ${status}: ${message}`); + this.name = "ApiError"; + } +} + +export interface AgentRow { + name: string; + version: string; + status: string; + url?: string; + description?: string; +} + +export class ControlPlaneClient { + constructor( + private apiUrl: string, + private token: string | null, + ) { + this.apiUrl = apiUrl.replace(/\/+$/, ""); + } + + private headers(): Record { + const h: Record = { "content-type": "application/json" }; + if (this.token) h["authorization"] = `bearer ${this.token}`; + return h; + } + + private async request(method: string, path: string, body?: unknown): Promise { + const resp = await fetch(`${this.apiUrl}${path}`, { + method, + headers: this.headers(), + body: body !== undefined ? JSON.stringify(body) : undefined, + }); + if (!resp.ok) { + let detail: string; + try { + const j: any = await resp.json(); + detail = j?.detail ?? JSON.stringify(j); + } catch { + detail = await resp.text(); + } + throw new ApiError(resp.status, detail); + } + if (resp.status === 204) return undefined as T; + return (await resp.json()) as T; + } + + login(email: string, password: string) { + return this.request<{ access_token: string; user: { email: string } }>( + "POST", + "/v1/auth/login", + { email, password }, + ); + } + + signup(email: string, password: string) { + return this.request<{ access_token: string; user: { email: string } }>( + "POST", + "/v1/auth/signup", + { email, password }, + ); + } + + me() { + return this.request<{ email: string }>("GET", "/v1/me"); + } + + listAgents() { + return this.request("GET", "/v1/agents"); + } + + getAgent(name: string) { + return this.request("GET", `/v1/agents/${encodeURIComponent(name)}`); + } +} diff --git a/src/cli.ts b/src/cli.ts new file mode 100644 index 0000000..64ef196 --- /dev/null +++ b/src/cli.ts @@ -0,0 +1,242 @@ +#!/usr/bin/env node +/** + * `a2a-mcp` — install once, expose any number of a2acloud agents to your MCP + * client (Claude Code, Cursor, etc.). + * + * No-argument invocation runs the gateway over stdio. That's the form an MCP + * client launches. Subcommands manage the local agent list, auth, etc. + */ +import { Command } from "commander"; +import readline from "node:readline/promises"; +import { stdin as input, stdout as output, stderr } from "node:process"; + +import { ApiError, ControlPlaneClient } from "./api.js"; +import { addAgent, loadConfig, removeAgent } from "./config.js"; +import { + DEFAULT_API_URL, + clearCredentials, + loadCredentials, + resolveApiUrl, + saveCredentials, +} from "./credentials.js"; +import { runStdio } from "./gateway.js"; + +const program = new Command(); + +program + .name("a2a-mcp") + .description("MCP gateway for a2acloud agents.") + .version("0.1.0"); + +async function client(apiOverride?: string): Promise { + const creds = await loadCredentials(); + const apiUrl = resolveApiUrl(apiOverride ?? creds?.apiUrl); + return new ControlPlaneClient(apiUrl, creds?.token ?? null); +} + +function fail(msg: string, code = 1): never { + stderr.write(`error: ${msg}\n`); + process.exit(code); +} + +async function prompt(label: string, opts: { hidden?: boolean } = {}): Promise { + const rl = readline.createInterface({ input, output, terminal: true }); + try { + if (opts.hidden) { + // readline doesn't natively hide; this is a best-effort hide. + const orig = (rl as any)._writeToOutput; + (rl as any)._writeToOutput = (s: string) => { + if (s.includes(label)) (output as any).write(label); + else (output as any).write("*"); + }; + const answer = await rl.question(label); + (rl as any)._writeToOutput = orig; + output.write("\n"); + return answer; + } + return await rl.question(label); + } finally { + rl.close(); + } +} + +// --- run (default) --------------------------------------------------------- # + +program + .command("run", { isDefault: true, hidden: true }) + .description("Start the MCP gateway on stdio (invoked by your MCP client).") + .action(async () => { + try { + await runStdio(); + } catch (err) { + stderr.write(`a2a-mcp: ${(err as Error).message}\n`); + process.exit(1); + } + }); + +// --- auth ------------------------------------------------------------------ # + +program + .command("login") + .description("Authenticate against the control plane.") + .option("--email ") + .option("--password ") + .option("--api ", "Override control plane URL", DEFAULT_API_URL) + .action(async (opts: { email?: string; password?: string; api: string }) => { + const email = opts.email ?? (await prompt("email: ")); + const password = opts.password ?? (await prompt("password: ", { hidden: true })); + const api = resolveApiUrl(opts.api); + try { + const out = await new ControlPlaneClient(api, null).login(email, password); + await saveCredentials({ apiUrl: api, token: out.access_token, email: out.user.email }); + output.write(`logged in as ${out.user.email} @ ${api}\n`); + } catch (err) { + fail(err instanceof ApiError ? err.message : (err as Error).message); + } + }); + +program + .command("logout") + .description("Forget the cached token.") + .action(async () => { + const cleared = await clearCredentials(); + output.write(cleared ? "logged out\n" : "(not logged in)\n"); + }); + +program + .command("whoami") + .description("Show the currently logged-in user.") + .action(async () => { + const creds = await loadCredentials(); + if (!creds) fail("not logged in (run `a2a-mcp login`)"); + try { + const me = await (await client()).me(); + output.write(`${me.email} (${creds.apiUrl})\n`); + } catch (err) { + fail(err instanceof ApiError ? err.message : (err as Error).message); + } + }); + +// --- agents ---------------------------------------------------------------- # + +program + .command("agents") + .description("List agents visible to your account (control-plane truth).") + .option("--api ") + .action(async (opts: { api?: string }) => { + try { + const rows = await (await client(opts.api)).listAgents(); + if (rows.length === 0) { + output.write("(no agents)\n"); + return; + } + for (const r of rows) { + output.write( + ` ${r.name} v${r.version} [${r.status}] ${r.url ?? "-"}\n`, + ); + } + } catch (err) { + fail(err instanceof ApiError ? err.message : (err as Error).message); + } + }); + +program + .command("list") + .description("List the agents this gateway exposes locally.") + .action(async () => { + const cfg = await loadConfig(); + if (cfg.agents.length === 0) { + output.write("(no agents added; try `a2a-mcp add `)\n"); + return; + } + for (const a of cfg.agents) output.write(` ${a.name} ${a.url}\n`); + }); + +program + .command("add ") + .description("Enable an agent in this gateway (queries control plane for URL).") + .option("--url ", "Skip the control-plane lookup and use this URL") + .option("--api ") + .action( + async (name: string, opts: { url?: string; api?: string }) => { + let url = opts.url; + let description: string | undefined; + if (!url) { + try { + const row = await (await client(opts.api)).getAgent(name); + url = row.url; + description = row.description; + } catch (err) { + fail(err instanceof ApiError ? err.message : (err as Error).message); + } + } + if (!url) fail(`agent ${name} has no public URL yet`); + await addAgent({ + name, + url, + description, + addedAt: new Date().toISOString(), + }); + output.write(`added ${name} -> ${url}\n`); + output.write("restart your MCP client to pick up the new tools.\n"); + }, + ); + +program + .command("remove ") + .alias("rm") + .description("Remove an agent from this gateway.") + .action(async (name: string) => { + const ok = await removeAgent(name); + output.write(ok ? `removed ${name}\n` : `${name} was not enabled\n`); + }); + +// --- doctor ---------------------------------------------------------------- # + +program + .command("doctor") + .description("Probe each enabled agent's /mcp endpoint and report tool counts.") + .action(async () => { + const cfg = await loadConfig(); + const creds = await loadCredentials(); + if (cfg.agents.length === 0) { + output.write("(no agents enabled)\n"); + return; + } + const { UpstreamAgent } = await import("./upstream.js"); + for (const a of cfg.agents) { + const u = new UpstreamAgent({ + name: a.name, + url: a.url, + token: creds?.token ?? null, + }); + try { + const tools = await u.listTools(); + output.write(` ${a.name}: ok (${tools.length} tools)\n`); + } catch (err) { + output.write(` ${a.name}: FAIL ${(err as Error).message}\n`); + } + } + }); + +// --- print-config ---------------------------------------------------------- # + +program + .command("print-config") + .description("Print the JSON snippet to paste into your MCP client config.") + .action(async () => { + const snippet = { + mcpServers: { + a2a: { + command: "npx", + args: ["-y", "@a2a/mcp"], + }, + }, + }; + output.write(JSON.stringify(snippet, null, 2) + "\n"); + }); + +program.parseAsync(process.argv).catch((err) => { + stderr.write(`a2a-mcp: ${(err as Error).message}\n`); + process.exit(1); +}); diff --git a/src/config.ts b/src/config.ts new file mode 100644 index 0000000..85526ad --- /dev/null +++ b/src/config.ts @@ -0,0 +1,62 @@ +/** + * Local config at ~/.a2a/mcp.json — which agents the gateway should expose. + * + * We store the agent URL alongside the name so the gateway never needs to hit + * the control plane during startup. Adding/removing an agent is a single + * file write; the MCP client picks up the change on the next list_tools. + */ +import { promises as fs } from "node:fs"; +import os from "node:os"; +import path from "node:path"; + +export interface EnabledAgent { + name: string; + url: string; + description?: string; + addedAt: string; +} + +export interface GatewayConfig { + version: 1; + agents: EnabledAgent[]; +} + +const cfgDir = () => path.join(os.homedir(), ".a2a"); +const cfgFile = () => path.join(cfgDir(), "mcp.json"); + +const EMPTY: GatewayConfig = { version: 1, agents: [] }; + +export async function loadConfig(): Promise { + try { + const raw = await fs.readFile(cfgFile(), "utf8"); + const data = JSON.parse(raw); + if (data?.version !== 1 || !Array.isArray(data.agents)) return { ...EMPTY }; + return data as GatewayConfig; + } catch (err: any) { + if (err?.code === "ENOENT") return { ...EMPTY }; + throw err; + } +} + +export async function saveConfig(cfg: GatewayConfig): Promise { + await fs.mkdir(cfgDir(), { recursive: true }); + await fs.writeFile(cfgFile(), JSON.stringify(cfg, null, 2), { mode: 0o600 }); +} + +export async function addAgent(agent: EnabledAgent): Promise { + const cfg = await loadConfig(); + const existing = cfg.agents.findIndex((a) => a.name === agent.name); + if (existing >= 0) cfg.agents[existing] = agent; + else cfg.agents.push(agent); + await saveConfig(cfg); + return cfg; +} + +export async function removeAgent(name: string): Promise { + const cfg = await loadConfig(); + const before = cfg.agents.length; + cfg.agents = cfg.agents.filter((a) => a.name !== name); + if (cfg.agents.length === before) return false; + await saveConfig(cfg); + return true; +} diff --git a/src/credentials.ts b/src/credentials.ts new file mode 100644 index 0000000..8a29ff4 --- /dev/null +++ b/src/credentials.ts @@ -0,0 +1,61 @@ +/** + * Reader for ~/.a2a/credentials.json — same file the Python `a2a` CLI writes. + * + * We deliberately *only read* this file (and overwrite it on `a2a-mcp login`) + * so a single login flow is shared between the Python and Node tooling. + */ +import { promises as fs } from "node:fs"; +import os from "node:os"; +import path from "node:path"; + +export const DEFAULT_API_URL = "https://api.a2acloud.io"; + +export interface Credentials { + apiUrl: string; + token: string; + email: string; +} + +const credsDir = () => path.join(os.homedir(), ".a2a"); +const credsFile = () => path.join(credsDir(), "credentials.json"); + +export async function loadCredentials(): Promise { + try { + const raw = await fs.readFile(credsFile(), "utf8"); + const data = JSON.parse(raw); + if (!data?.token) return null; + return { + apiUrl: data.api_url ?? DEFAULT_API_URL, + token: data.token, + email: data.email ?? "", + }; + } catch (err: any) { + if (err?.code === "ENOENT") return null; + throw err; + } +} + +export async function saveCredentials(c: Credentials): Promise { + await fs.mkdir(credsDir(), { recursive: true }); + await fs.writeFile( + credsFile(), + JSON.stringify({ api_url: c.apiUrl, token: c.token, email: c.email }), + { mode: 0o600 }, + ); +} + +export async function clearCredentials(): Promise { + try { + await fs.unlink(credsFile()); + return true; + } catch (err: any) { + if (err?.code === "ENOENT") return false; + throw err; + } +} + +export function resolveApiUrl(override?: string): string { + if (override) return override; + if (process.env.A2A_API_URL) return process.env.A2A_API_URL; + return DEFAULT_API_URL; +} diff --git a/src/gateway.ts b/src/gateway.ts new file mode 100644 index 0000000..b6efed5 --- /dev/null +++ b/src/gateway.ts @@ -0,0 +1,128 @@ +/** + * MCP gateway server. Fans out tools/list and tools/call to each enabled + * upstream agent (deployed on a2acloud). Tool names are prefixed with the + * agent slug so multiple agents can coexist in one MCP namespace. + * + * Naming: ``{agent}__{skill}``. Double underscore separator. Skill names + * containing ``__`` are not supported. + */ +import { Server } from "@modelcontextprotocol/sdk/server/index.js"; +import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js"; +import { + CallToolRequestSchema, + ListToolsRequestSchema, +} from "@modelcontextprotocol/sdk/types.js"; + +import { loadConfig, type EnabledAgent } from "./config.js"; +import { loadCredentials } from "./credentials.js"; +import { UpstreamAgent, UpstreamError, type UpstreamTool } from "./upstream.js"; + +export const SEP = "__"; + +export interface GatewayOptions { + /** Override the enabled agents (otherwise read from ~/.a2a/mcp.json). */ + agents?: EnabledAgent[]; + /** Override the bearer token (otherwise read from ~/.a2a/credentials.json). */ + token?: string | null; + /** Optional override for the underlying MCP Server (tests). */ + server?: Server; +} + +export interface GatewayHandle { + server: Server; + upstreams: Map; +} + +export async function buildGateway(opts: GatewayOptions = {}): Promise { + const cfg = opts.agents ?? (await loadConfig()).agents; + const token = + opts.token !== undefined + ? opts.token + : (await loadCredentials())?.token ?? null; + + const upstreams = new Map(); + for (const a of cfg) { + upstreams.set(a.name, new UpstreamAgent({ name: a.name, url: a.url, token })); + } + + const server = + opts.server ?? + new Server( + { name: "a2a-mcp", version: "0.1.0" }, + { capabilities: { tools: { listChanged: false } } }, + ); + + server.setRequestHandler(ListToolsRequestSchema, async () => { + const tools: Array = []; + await Promise.all( + [...upstreams.values()].map(async (u) => { + try { + const upstreamTools = await u.listTools(); + for (const t of upstreamTools) { + tools.push({ + ...t, + name: `${u.name}${SEP}${t.name}`, + description: t.description + ? `[${u.name}] ${t.description}` + : `[${u.name}] ${t.name}`, + }); + } + } catch (err) { + // Silently skip an upstream that's down — surfacing an error here + // would break the client's whole tool list. The user can debug via + // `a2a-mcp doctor`. + process.stderr.write( + `a2a-mcp: skipping ${u.name}: ${(err as Error).message}\n`, + ); + } + }), + ); + return { tools }; + }); + + server.setRequestHandler(CallToolRequestSchema, async (req) => { + const fullName = req.params.name; + const idx = fullName.indexOf(SEP); + if (idx < 0) { + return _softError(`tool name missing agent prefix: ${fullName}`) as any; + } + const agentName = fullName.slice(0, idx); + const toolName = fullName.slice(idx + SEP.length); + const upstream = upstreams.get(agentName); + if (!upstream) { + return _softError(`unknown agent: ${agentName}`) as any; + } + try { + const result = await upstream.callTool( + toolName, + (req.params.arguments as Record) ?? {}, + ); + // Pass through the upstream's CallToolResult as-is. Upstreams already + // populate content / structuredContent / isError per the MCP spec. + // Cast through `unknown` because the SDK's ServerResult union has + // additional task-shaped variants we don't produce. + return result as unknown as any; + } catch (err) { + const msg = + err instanceof UpstreamError + ? err.message + : `${(err as Error).name}: ${(err as Error).message}`; + return _softError(msg) as any; + } + }); + + return { server, upstreams }; +} + +export async function runStdio(opts: GatewayOptions = {}): Promise { + const { server } = await buildGateway(opts); + const transport = new StdioServerTransport(); + await server.connect(transport); +} + +function _softError(message: string) { + return { + content: [{ type: "text" as const, text: message }], + isError: true, + }; +} diff --git a/src/index.ts b/src/index.ts new file mode 100644 index 0000000..a7b14ee --- /dev/null +++ b/src/index.ts @@ -0,0 +1,16 @@ +export { buildGateway, runStdio, SEP } from "./gateway.js"; +export type { GatewayHandle, GatewayOptions } from "./gateway.js"; +export { addAgent, loadConfig, removeAgent, saveConfig } from "./config.js"; +export type { EnabledAgent, GatewayConfig } from "./config.js"; +export { UpstreamAgent, UpstreamError } from "./upstream.js"; +export type { UpstreamCallResult, UpstreamConfig, UpstreamTool } from "./upstream.js"; +export { ControlPlaneClient, ApiError } from "./api.js"; +export type { AgentRow } from "./api.js"; +export { + DEFAULT_API_URL, + clearCredentials, + loadCredentials, + resolveApiUrl, + saveCredentials, +} from "./credentials.js"; +export type { Credentials } from "./credentials.js"; diff --git a/src/upstream.ts b/src/upstream.ts new file mode 100644 index 0000000..1fb0c78 --- /dev/null +++ b/src/upstream.ts @@ -0,0 +1,96 @@ +/** + * Per-agent JSON-RPC client. Talks to the deployed agent's POST /mcp endpoint. + * + * We hand-roll the wire calls (instead of using @modelcontextprotocol/sdk's + * Client) because (a) the surface we need is tiny — tools/list, tools/call — + * and (b) we want to send the user's bearer token as a plain Authorization + * header without coupling to a transport class. + */ +const JSON_RPC = "2.0"; + +export interface UpstreamConfig { + name: string; + url: string; + token: string | null; +} + +export interface UpstreamTool { + name: string; + description?: string; + inputSchema: unknown; + outputSchema?: unknown; +} + +export interface UpstreamCallResult { + content: Array<{ type: string; text?: string; [k: string]: unknown }>; + structuredContent?: unknown; + isError?: boolean; +} + +export class UpstreamError extends Error { + constructor( + public agent: string, + public status: number, + message: string, + ) { + super(`upstream ${agent}: ${message}`); + this.name = "UpstreamError"; + } +} + +let _nextId = 1; + +export class UpstreamAgent { + constructor(private cfg: UpstreamConfig) { + this.cfg.url = cfg.url.replace(/\/+$/, ""); + } + + get name(): string { + return this.cfg.name; + } + + private async rpc(method: string, params: unknown): Promise { + const id = _nextId++; + const headers: Record = { + "content-type": "application/json", + accept: "application/json", + }; + if (this.cfg.token) headers["authorization"] = `Bearer ${this.cfg.token}`; + + const resp = await fetch(`${this.cfg.url}/mcp`, { + method: "POST", + headers, + body: JSON.stringify({ jsonrpc: JSON_RPC, id, method, params }), + }); + + if (!resp.ok) { + const text = await resp.text().catch(() => ""); + throw new UpstreamError(this.cfg.name, resp.status, text || resp.statusText); + } + + const env: any = await resp.json(); + if (env?.error) { + throw new UpstreamError( + this.cfg.name, + 500, + `${env.error.code}: ${env.error.message}`, + ); + } + return env?.result as T; + } + + async listTools(): Promise { + const out = await this.rpc<{ tools: UpstreamTool[] }>("tools/list", {}); + return out?.tools ?? []; + } + + async callTool( + name: string, + arguments_: Record, + ): Promise { + return this.rpc("tools/call", { + name, + arguments: arguments_, + }); + } +} diff --git a/tests/config.test.ts b/tests/config.test.ts new file mode 100644 index 0000000..123886f --- /dev/null +++ b/tests/config.test.ts @@ -0,0 +1,46 @@ +import { test, beforeEach, afterEach } from "node:test"; +import assert from "node:assert/strict"; +import os from "node:os"; +import path from "node:path"; +import { promises as fs } from "node:fs"; + +import { addAgent, loadConfig, removeAgent } from "../src/config.js"; + +let originalHome: string | undefined; +let tmpHome: string; + +beforeEach(async () => { + originalHome = process.env.HOME; + tmpHome = await fs.mkdtemp(path.join(os.tmpdir(), "a2a-mcp-")); + process.env.HOME = tmpHome; +}); + +afterEach(async () => { + if (originalHome !== undefined) process.env.HOME = originalHome; + else delete process.env.HOME; + await fs.rm(tmpHome, { recursive: true, force: true }); +}); + +test("loadConfig returns empty when file is missing", async () => { + const cfg = await loadConfig(); + assert.deepEqual(cfg, { version: 1, agents: [] }); +}); + +test("addAgent persists and replaces by name", async () => { + await addAgent({ name: "a", url: "https://x", addedAt: "t1" }); + await addAgent({ name: "b", url: "https://y", addedAt: "t1" }); + await addAgent({ name: "a", url: "https://z", addedAt: "t2" }); + const cfg = await loadConfig(); + assert.deepEqual( + cfg.agents.map((a) => `${a.name}:${a.url}`), + ["a:https://z", "b:https://y"], + ); +}); + +test("removeAgent reports hit/miss", async () => { + await addAgent({ name: "a", url: "https://x", addedAt: "t" }); + assert.equal(await removeAgent("missing"), false); + assert.equal(await removeAgent("a"), true); + const cfg = await loadConfig(); + assert.equal(cfg.agents.length, 0); +}); diff --git a/tests/gateway.test.ts b/tests/gateway.test.ts new file mode 100644 index 0000000..9765690 --- /dev/null +++ b/tests/gateway.test.ts @@ -0,0 +1,211 @@ +import { test } from "node:test"; +import assert from "node:assert/strict"; +import http from "node:http"; +import { AddressInfo } from "node:net"; + +import { Server } from "@modelcontextprotocol/sdk/server/index.js"; +import { + CallToolRequestSchema, + ListToolsRequestSchema, +} from "@modelcontextprotocol/sdk/types.js"; + +import { buildGateway, SEP } from "../src/gateway.js"; +import type { EnabledAgent } from "../src/config.js"; + +/** + * Fake upstream A2A agent: speaks the JSON-RPC subset the gateway uses + * (initialize, tools/list, tools/call). One handler per server instance. + */ +function startFakeAgent(opts: { + tools: Array<{ name: string; description: string; inputSchema: any; outputSchema?: any }>; + onCall: (name: string, args: any) => any; + authHeader?: string; +}): Promise<{ url: string; close: () => Promise; requests: any[] }> { + const requests: any[] = []; + return new Promise((resolve) => { + const server = http.createServer((req, res) => { + if (req.method !== "POST" || req.url !== "/mcp") { + res.statusCode = 404; + res.end(); + return; + } + const auth = req.headers["authorization"]; + const chunks: Buffer[] = []; + req.on("data", (c) => chunks.push(c)); + req.on("end", () => { + const body = JSON.parse(Buffer.concat(chunks).toString("utf8")); + requests.push({ auth, body }); + let result: any; + if (body.method === "tools/list") { + result = { tools: opts.tools }; + } else if (body.method === "tools/call") { + try { + result = opts.onCall(body.params.name, body.params.arguments); + } catch (err) { + res.setHeader("content-type", "application/json"); + res.end( + JSON.stringify({ + jsonrpc: "2.0", + id: body.id, + error: { code: -32603, message: (err as Error).message }, + }), + ); + return; + } + } else { + result = {}; + } + res.setHeader("content-type", "application/json"); + res.end(JSON.stringify({ jsonrpc: "2.0", id: body.id, result })); + }); + }); + server.listen(0, "127.0.0.1", () => { + const { port } = server.address() as AddressInfo; + resolve({ + url: `http://127.0.0.1:${port}`, + requests, + close: () => new Promise((r) => server.close(() => r())), + }); + }); + }); +} + +/** Drive an in-process gateway Server via the SDK's request handlers. */ +async function callGateway( + agents: EnabledAgent[], + token: string | null, + method: "tools/list" | "tools/call", + params: any, +) { + const mcpServer = new Server( + { name: "test", version: "0.0.0" }, + { capabilities: { tools: { listChanged: false } } }, + ); + await buildGateway({ agents, token, server: mcpServer }); + // Reach into the server's registered handlers — the SDK exposes them via + // a private map, so we route through the public schema-keyed lookup we + // know is wired up. + const schema = method === "tools/list" ? ListToolsRequestSchema : CallToolRequestSchema; + const handler = (mcpServer as any)._requestHandlers.get(schema.shape.method.value); + if (!handler) throw new Error("handler not registered"); + return handler({ method, params }, {} as any); +} + +test("tools/list aggregates upstream tools with agent prefix", async () => { + const upstream = await startFakeAgent({ + tools: [ + { + name: "greet", + description: "Greet someone", + inputSchema: { type: "object", properties: { who: { type: "string" } } }, + }, + ], + onCall: () => ({ content: [{ type: "text", text: "hi" }], isError: false }), + }); + try { + const out = await callGateway( + [{ name: "greeter", url: upstream.url, addedAt: "now" }], + null, + "tools/list", + {}, + ); + assert.equal(out.tools.length, 1); + assert.equal(out.tools[0].name, `greeter${SEP}greet`); + assert.match(out.tools[0].description, /\[greeter\]/); + } finally { + await upstream.close(); + } +}); + +test("tools/list survives a single upstream failure", async () => { + const good = await startFakeAgent({ + tools: [ + { + name: "ping", + description: "p", + inputSchema: { type: "object", properties: {} }, + }, + ], + onCall: () => ({ content: [], isError: false }), + }); + try { + const out = await callGateway( + [ + { name: "broken", url: "http://127.0.0.1:1", addedAt: "now" }, + { name: "good", url: good.url, addedAt: "now" }, + ], + null, + "tools/list", + {}, + ); + const names = out.tools.map((t: any) => t.name); + assert.deepEqual(names, [`good${SEP}ping`]); + } finally { + await good.close(); + } +}); + +test("tools/call routes by agent prefix and forwards the bearer token", async () => { + const upstream = await startFakeAgent({ + tools: [], + onCall: (name, args) => ({ + content: [{ type: "text", text: `called ${name} with ${args.who}` }], + structuredContent: { result: `hello ${args.who}` }, + isError: false, + }), + }); + try { + const result = await callGateway( + [{ name: "greeter", url: upstream.url, addedAt: "now" }], + "tkn-123", + "tools/call", + { name: `greeter${SEP}greet`, arguments: { who: "world" } }, + ); + assert.equal(result.isError, false); + assert.equal(result.structuredContent.result, "hello world"); + const req = upstream.requests.find((r) => r.body.method === "tools/call"); + assert.equal(req.auth, "Bearer tkn-123"); + assert.equal(req.body.params.name, "greet"); // prefix stripped + } finally { + await upstream.close(); + } +}); + +test("tools/call with unknown agent returns soft error", async () => { + const result = await callGateway([], null, "tools/call", { + name: `ghost${SEP}skill`, + arguments: {}, + }); + assert.equal(result.isError, true); + assert.match(result.content[0].text, /unknown agent: ghost/); +}); + +test("tools/call without prefix returns soft error", async () => { + const result = await callGateway([], null, "tools/call", { + name: "no_prefix", + arguments: {}, + }); + assert.equal(result.isError, true); + assert.match(result.content[0].text, /missing agent prefix/); +}); + +test("tools/call surfaces upstream JSON-RPC error as soft error", async () => { + const upstream = await startFakeAgent({ + tools: [], + onCall: () => { + throw new Error("kaboom"); + }, + }); + try { + const result = await callGateway( + [{ name: "boom", url: upstream.url, addedAt: "now" }], + null, + "tools/call", + { name: `boom${SEP}explode`, arguments: {} }, + ); + assert.equal(result.isError, true); + assert.match(result.content[0].text, /kaboom/); + } finally { + await upstream.close(); + } +}); diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 0000000..69a1733 --- /dev/null +++ b/tsconfig.json @@ -0,0 +1,21 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "ES2022", + "moduleResolution": "bundler", + "lib": ["ES2022"], + "outDir": "dist", + "rootDir": "src", + "declaration": true, + "declarationMap": true, + "sourceMap": true, + "strict": true, + "esModuleInterop": true, + "skipLibCheck": true, + "resolveJsonModule": true, + "isolatedModules": true, + "forceConsistentCasingInFileNames": true + }, + "include": ["src/**/*.ts"], + "exclude": ["dist", "node_modules", "tests"] +}