Tool returns isError

tool-always-errors · Tools — execution

Endpoint (Streamable HTTP)

https://chaos-mcp.thomascdnns.com/s/tool-always-errors/mcp

On the wire — recorded from a real request

Symptom

what you'll observe

tools/call succeeds at the protocol level but the result is flagged isError every time.

Cause

what this reproduces

The tool's underlying operation always fails (bad credential, missing resource).

Fix

how you'd resolve it

Surface a clear error message and the cause; fix the dependency or input handling.

Try it with curl

bash

curl -sS -X POST \
  https://chaos-mcp.thomascdnns.com/s/tool-always-errors/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"}
    }
  }'