Rate limited (429)

rate-limited · Status & reliability

Endpoint (Streamable HTTP)

https://chaos-mcp.thomascdnns.com/s/rate-limited/mcp

On the wire — recorded from a real request

Symptom

what you'll observe

Client gets HTTP 429 with Retry-After; tools never run.

Cause

what this reproduces

Aggressive rate limiting that counts MCP handshakes, or a shared quota.

Fix

how you'd resolve it

Exempt the handshake, honour Retry-After in the client, and raise per-session limits.

Try it with curl

bash

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