"Files formatted in JSON" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Check an A2A agent before you delegate, or an MCP server's measured conduct. Free, no key.
Free platform to test MCP clients without installing anything. Create mock tools with dynamic templates, configurable delays, conditions (if/then), and response sequences. Supports JSON-RPC 2.0 over Streamable HTTP. Built-in text_echo and json_echo tools. Rate-limited tiers: anonymous (5 calls/min, 1 mock tool), registered (10 calls/min, 4 mock tools), premium (60 calls/min, unlimited). Zero setup — no install, no registration required. More info: https://www.testmcp.dev
What is known to be broken in an MCP server or API operation, with the check that found it.
Deploy production REST APIs from JSON schemas in seconds. Manage projects, schemas, and deployments.
Point Claude Code, Qwen Code, Cursor, or any MCP client at https://docs.jmeter.ai/api/mcp and your agent answers JMeter questions grounded in this documentation, with a source link for every answer. Free, no API key, no signup.
Replay supplied records against old and new bounded JSON Schema draft-07 contracts. Receive exact...
{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no key
Production proofs for breaking JSON Schema/MCP changes; UNKNOWN/NO_WITNESS_FOUND not compatible.
Regex matching, email/URL format validation, and JSON Schema validation.
X-Correlation-Id charset, value discarded
JSON Merge Patch key count, body discarded
Deterministic JSON checks with signed evidence and x402-paid execution
Whether an HTTP status is retryable
If-Unmodified-Since HTTP-date, value discarded
If-Match etag list count, value discarded
Whether a token is an HTTP method
If-None-Match star-or-etag, value discarded
JSON byte count, body discarded
