"Information about draw.io diagramming tool" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Publish your API docs so AI assistants can look up endpoints and call your API correctly.
See which AI models fall for traps in everyday jobs, and check or scan any MCP server, skill or package before your agent installs it. No sign-in; read-only; returns structured data.
Serverless 15-tool B2B email deliverability, domain security, OpenAPI breaking-change release gate, LLMO /llms.txt auditor, and quantitative trading risk MCP connector.
Grade MCP tool definitions for agent-readiness: score, A-F grade, fixes, est. token cost.
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
Hosted MCP infrastructure with seven typed tools: JSON repair, JSON Schema validation, JSON to TypeScript, CSV to JSON, JSON to CSV, OpenAPI security and webhook checks. Public tool discovery; execution uses scoped Bearer keys with tool allowlists, quotas and request IDs. Free deterministic calls, no LLM calls or USDC payments. Runnable repair → validate → CSV example: https://invokeport.com/agents/workflows/json-pipeline. MCP through 2025-11-25; custom headers, no OAuth.
{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"whoami","arguments":{}}} free no key
Free agent-service discovery, OpenAPI document checks, and receipt verification. No API key needed.
MCP tool observatory: do registry servers answer, and are their answers true? No key.
Send and debug webhooks — applications, endpoints, messages, delivery attempts and replays.
JSON Schema validation MCP.
npm MCP — wraps the npm Registry API (free, no auth)
JSONPlaceholder MCP — wraps JSONPlaceholder fake REST API (free, no auth)
mercury-number MCP — wraps StupidAPIs (keyless — no credential needed)
excuse MCP — wraps StupidAPIs (keyless — no credential needed)
chaos-index MCP — wraps StupidAPIs (keyless — no credential needed)
always-seven MCP — wraps StupidAPIs (keyless — no credential needed)
corporate-apology MCP — wraps StupidAPIs (keyless — no credential needed)
apology MCP — wraps StupidAPIs (keyless — no credential needed)
schrodingers-boolean MCP — wraps StupidAPIs (keyless — no credential needed)
ship-on-friday MCP — wraps StupidAPIs (keyless — no credential needed)
passive-aggression MCP — wraps StupidAPIs (keyless — no credential needed)
yc-rejection MCP — wraps StupidAPIs (keyless — no credential needed)
victorian-complaint MCP — wraps StupidAPIs (keyless — no credential needed)
the-committee MCP — wraps StupidAPIs (keyless — no credential needed)
Check an MCP endpoint resolves: liveness, live tool list, schema drift. Free.
Instant no-signup webhook & HTTP-request inspector for testing webhooks and agent tool-callbacks.
End-to-end API testing — generate and run tests from OpenAPI, curl, Postman, or real user traffic.
