Invalid inputSchema

bad-tool-schema · Tools — listing

Endpoint (Streamable HTTP)

https://chaos-mcp.thomascdnns.com/s/bad-tool-schema/mcp

On the wire — recorded from a real request

Symptom

what you'll observe

Clients that validate schemas reject the tool; others can't build a valid call.

Cause

what this reproduces

Hand-written JSON Schema with an invalid type and a required field that isn't defined.

Fix

how you'd resolve it

Generate schemas from types or validate them against the JSON Schema meta-schema.

Try it with curl

bash

curl -sS -X POST \
  https://chaos-mcp.thomascdnns.com/s/bad-tool-schema/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "initialize",
    "params": {
      "protocolVersion": "2024-11-05",
      "capabilities": {},
      "clientInfo": {"name": "curl", "version": "1"}
    }
  }'