30 lines
1.7 KiB
Python
Executable File
30 lines
1.7 KiB
Python
Executable File
#!/usr/bin/env python3
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# A tools bundle in a second language (novox/hq ADR 0188): MCP over stdio, no SDK, no dependencies.
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# One tool of its own, one seat verb, and one that exits the process mid-call.
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import json, sys
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def say(m):
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m["jsonrpc"] = "2.0"; sys.stdout.write(json.dumps(m) + "\n"); sys.stdout.flush()
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TOOLS = [
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{"name": "greet", "description": "say hello", "inputSchema": {"type": "object", "properties": {"who": {"type": "string"}}}},
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{"name": "node-lamp.on", "description": "the seat's verb", "inputSchema": {"type": "object", "properties": {}}},
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{"name": "die", "description": "exit without answering", "inputSchema": {"type": "object", "properties": {}}},
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]
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for line in sys.stdin:
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req = json.loads(line); rid = req.get("id"); m = req.get("method"); p = req.get("params") or {}
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if m == "initialize":
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say({"id": rid, "result": {"protocolVersion": "2025-03-26", "capabilities": {"tools": {}}, "serverInfo": {"name": "delta", "version": "1"}}})
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elif m == "tools/list":
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say({"id": rid, "result": {"tools": TOOLS}})
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elif m == "tools/call":
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name = p.get("name"); args = p.get("arguments") or {}
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if name == "greet":
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say({"id": rid, "result": {"content": [{"type": "text", "text": json.dumps({"greeting": "hello " + args.get("who", "world"), "language": "python"})}]}})
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elif name == "node-lamp.on":
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say({"id": rid, "result": {"content": [{"type": "text", "text": json.dumps({"on": True, "language": "python"})}]}})
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elif name == "die":
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print("delta: told to die", file=sys.stderr); sys.exit(3)
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else:
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say({"id": rid, "error": {"code": -32602, "message": "no such tool"}})
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