#!/usr/bin/env python3
# A tools bundle that says who the runtime said called it (novox/hq issue 365): MCP over stdio, no SDK. Its tool
# and its seat verb answer the caller the call's `_meta` named — "" when it named none — and the arguments as given.
import json, sys

def say(m):
    m["jsonrpc"] = "2.0"; sys.stdout.write(json.dumps(m) + "\n"); sys.stdout.flush()

TOOLS = [
    {"name": "who", "description": "who called", "inputSchema": {"type": "object", "properties": {}}},
    {"name": "node-desk.who", "description": "who called the seat's verb", "inputSchema": {"type": "object", "properties": {}}},
]
for line in sys.stdin:
    req = json.loads(line); rid = req.get("id"); m = req.get("method"); p = req.get("params") or {}
    if m == "initialize":
        say({"id": rid, "result": {"protocolVersion": "2025-03-26", "capabilities": {"tools": {}}, "serverInfo": {"name": "ledger", "version": "1"}}})
    elif m == "tools/list":
        say({"id": rid, "result": {"tools": TOOLS}})
    elif m == "tools/call":
        meta = p.get("_meta") or {}
        said = {"caller": meta.get("mesh/caller", ""), "arguments": p.get("arguments") or {}}
        say({"id": rid, "result": {"content": [{"type": "text", "text": json.dumps(said)}]}})
    elif rid is not None:
        say({"id": rid, "result": {}})