243 lines
9.6 KiB
Python
243 lines
9.6 KiB
Python
#!/usr/bin/env python3
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# MCP stdio server exposing one tool ("ask") that opens a live ACP
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# (Agent Client Protocol) session against a peer Kilo workspace over TCP and
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# returns its final response. This exists because kilo serve has no MCP
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# server endpoint of its own (confirmed by dumping every route in the kilo
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# binary) — kilo acp is a real, tool-capable agent session, but it only
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# speaks JSON-RPC over stdio, so acp-bridge-listen.sh exposes it via socat
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# and this script bridges that into something kilo (as an MCP client) can
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# call as an ordinary "local" MCP server.
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import argparse
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import json
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import os
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import socket
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import sys
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import time
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TOOL_NAME = "ask"
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def read_stdin_messages():
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for line in sys.stdin:
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line = line.strip()
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if not line:
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continue
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try:
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yield json.loads(line)
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except json.JSONDecodeError:
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continue
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def write_message(obj):
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sys.stdout.write(json.dumps(obj) + "\n")
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sys.stdout.flush()
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def send_response(msg_id, result=None, error=None):
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msg = {"jsonrpc": "2.0", "id": msg_id}
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if error is not None:
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msg["error"] = error
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else:
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msg["result"] = result
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write_message(msg)
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class PeerConnectionError(Exception):
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pass
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class AcpPeer:
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def __init__(self, host, acp_port, info_port, model, timeout, token):
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self.host = host
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self.acp_port = acp_port
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self.info_port = info_port
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self.model = model
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self.timeout = timeout
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self.token = token
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def _fetch_project_dir(self):
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try:
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with socket.create_connection((self.host, self.info_port), timeout=10) as s:
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wf = s.makefile("w")
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wf.write(self.token + "\n")
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wf.flush()
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f = s.makefile("r")
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line = f.readline().strip()
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return line or "/home/coder"
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except OSError as e:
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raise PeerConnectionError(f"could not reach peer info port {self.host}:{self.info_port}: {e}")
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def ask(self, prompt_text):
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cwd = self._fetch_project_dir()
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deadline = time.time() + self.timeout
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try:
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sock = socket.create_connection((self.host, self.acp_port), timeout=15)
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except OSError as e:
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raise PeerConnectionError(f"could not reach peer ACP port {self.host}:{self.acp_port}: {e}")
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with sock:
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sock.settimeout(self.timeout)
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rf = sock.makefile("r")
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wf = sock.makefile("w")
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wf.write(self.token + "\n")
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wf.flush()
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def send(msg):
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wf.write(json.dumps(msg) + "\n")
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wf.flush()
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def recv():
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line = rf.readline()
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if not line:
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return None
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return json.loads(line)
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def await_response(expected_id, allow_error=False):
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while True:
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obj = recv()
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if obj is None:
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raise PeerConnectionError("peer connection closed unexpectedly")
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if obj.get("id") == expected_id:
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if "error" in obj and not allow_error:
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raise PeerConnectionError(f"peer error: {obj['error']}")
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return obj
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# ignore interleaved notifications while waiting for this response
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send({"jsonrpc": "2.0", "id": 1, "method": "initialize",
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"params": {"protocolVersion": 1, "clientCapabilities": {}}})
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await_response(1)
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send({"jsonrpc": "2.0", "id": 2, "method": "session/new",
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"params": {"cwd": cwd, "mcpServers": []}})
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resp = await_response(2)
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session_id = resp["result"]["sessionId"]
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send({"jsonrpc": "2.0", "id": 3, "method": "session/set_model",
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"params": {"sessionId": session_id, "modelId": self.model}})
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await_response(3, allow_error=True)
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send({"jsonrpc": "2.0", "id": 4, "method": "session/prompt",
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"params": {"sessionId": session_id,
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"prompt": [{"type": "text", "text": prompt_text}]}})
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text_parts = []
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tool_log = []
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while True:
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if time.time() > deadline:
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raise TimeoutError(f"peer did not finish within {self.timeout}s")
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obj = recv()
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if obj is None:
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raise PeerConnectionError("peer connection closed unexpectedly")
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method = obj.get("method")
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if method == "session/update":
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upd = obj["params"]["update"]
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su = upd.get("sessionUpdate")
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if su == "agent_message_chunk":
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content = upd.get("content", {})
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if content.get("type") == "text":
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text_parts.append(content["text"])
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elif su == "tool_call_update" and upd.get("status") == "completed":
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tool_log.append(upd.get("title") or upd.get("kind") or "tool")
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elif method == "session/request_permission":
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options = obj.get("params", {}).get("options", [])
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chosen = None
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for pref in ("allow_always", "allow_once", "allow"):
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for opt in options:
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if pref in str(opt.get("kind", "")):
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chosen = opt["optionId"]
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break
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if chosen:
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break
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if chosen is None and options:
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chosen = options[0]["optionId"]
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send({"jsonrpc": "2.0", "id": obj["id"],
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"result": {"outcome": {"outcome": "selected", "optionId": chosen}}})
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elif obj.get("id") == 4:
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break
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# else: ignore anything else (other notifications, stray responses)
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reply = "".join(text_parts).strip()
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if tool_log:
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reply += "\n\n[peer actions: " + ", ".join(tool_log) + "]"
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return reply or "(peer produced no text response)"
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def main():
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ap = argparse.ArgumentParser()
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ap.add_argument("--host", required=True)
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ap.add_argument("--acp-port", type=int, default=4097)
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ap.add_argument("--info-port", type=int, default=4098)
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ap.add_argument("--model", required=True)
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ap.add_argument("--peer-name", required=True)
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ap.add_argument("--timeout", type=int, default=600)
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args = ap.parse_args()
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# Read from the environment (inherited from the agent's own env, same as
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# acp-bridge-auth.py) rather than a CLI flag, so the shared secret never
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# ends up in kilo.jsonc's command array or in `ps` output.
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token = os.environ.get("PEER_BRIDGE_TOKEN", "")
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if not token:
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print(json.dumps({"jsonrpc": "2.0", "error": {"code": -32000, "message": "PEER_BRIDGE_TOKEN not set"}}))
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sys.exit(1)
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peer = AcpPeer(args.host, args.acp_port, args.info_port, args.model, args.timeout, token)
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for msg in read_stdin_messages():
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method = msg.get("method")
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msg_id = msg.get("id")
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if method == "initialize":
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client_version = msg.get("params", {}).get("protocolVersion", "2024-11-05")
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send_response(msg_id, result={
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"protocolVersion": client_version,
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"capabilities": {"tools": {}},
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"serverInfo": {"name": f"peer-bridge-{args.peer_name}", "version": "1.0.0"},
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})
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elif method == "notifications/initialized":
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pass
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elif method == "tools/list":
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send_response(msg_id, result={"tools": [{
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"name": TOOL_NAME,
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"description": (
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f"Ask the '{args.peer_name}' workspace's Kilo agent a question about its "
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"project, or hand it a task to work on. It runs with full autonomy in its "
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"own project directory (reads/edits/writes files, runs bash) and returns "
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"its final response once done. Each call starts a fresh session on the "
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"peer's side — include any needed context in the prompt itself."
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),
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"inputSchema": {
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"type": "object",
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"properties": {
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"prompt": {"type": "string", "description": "The question or task for the peer agent."},
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},
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"required": ["prompt"],
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},
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}]})
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elif method == "tools/call":
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params = msg.get("params", {})
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if params.get("name") != TOOL_NAME:
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send_response(msg_id, result={
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"content": [{"type": "text", "text": f"Unknown tool: {params.get('name')}"}],
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"isError": True,
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})
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continue
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prompt_text = params.get("arguments", {}).get("prompt", "")
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try:
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reply = peer.ask(prompt_text)
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send_response(msg_id, result={"content": [{"type": "text", "text": reply}], "isError": False})
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except Exception as e:
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send_response(msg_id, result={
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"content": [{"type": "text", "text": f"Peer request failed: {e}"}],
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"isError": True,
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})
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elif msg_id is not None:
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send_response(msg_id, error={"code": -32601, "message": f"Method not found: {method}"})
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# else: unrecognized notification, ignore
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if __name__ == "__main__":
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main()
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