tools/call result is null

null-result · Tools — execution

Endpoint (Streamable HTTP)

https://chaos-mcp.thomascdnns.com/s/null-result/mcp

On the wire — recorded from a real request

Symptom

what you'll observe

Client errors dereferencing result.content — the result is null.

Cause

what this reproduces

Returning null/None on a path that should still produce a content array.

Fix

how you'd resolve it

Always return {content: [...]}, even for empty results (use an empty text block).

Try it with curl

bash

curl -sS -X POST \
  https://chaos-mcp.thomascdnns.com/s/null-result/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"}
    }
  }'