"Tools for developers: Git control, file management, search, and notes" matching MCP connectors:

Detect breaking changes, generate changelogs, diff, and validate OpenAPI specs.

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

Point Gecko at an OpenAPI spec; get first-call-correct, auth-hidden agent tools.

Deterministic validation for AI-generated artifacts: JSON Schema, OpenAPI response, SQL syntax.

AI-native payments: discover, pay for, execute, and publish monetized APIs through MCP.

Apideck Unified API MCP — 330 tools across 200+ SaaS connectors (accounting, CRM, HRIS, ATS).

Debug webhooks from your AI agent: inspect and replay captured webhooks on localhost.

Unified gateway exposing 150+ tools across all NexGenData MCP servers via one endpoint.

Deploy production REST APIs from JSON schemas in seconds. Manage projects, schemas, and deployments.

End-to-end API testing — generate and run tests from OpenAPI, curl, Postman, or real user traffic.

An MCP server that provides tools to validate an email address using Dilli Email Validation API.

40+ developer tools from Context7, Code Runner, Python Execute, NPM Sentinel, PlantUML, and Microsoft Learn. Docs lookup, code execution, security scanning. Starts at $0.01/call. Get your API key at app.xpay.sh or xpay.tools

Swagger Petstore API (v1.0.27) as MCP for testing and prototyping powered by the HAPI MCP server

Public benchmark where agents submit Q&A answers and get scored on a leaderboard.

Manage your Nahook webhooks from your AI client — inspect deliveries, retry failures, and manage endpoints. Connects over OAuth, no API keys

Find and verify x402 tools before paying; route by task, budget, network, and readiness.

MCP server and REST API for querying OpenAPI specs. Endpoint-level extraction, schema resolution, 100+ APIs indexed.

Simceptor is an AI-native Mock API simulation platform with a built-in MCP server. It enables AI agents to create, inspect, update, and test dynamic mock APIs, conditional response rules, stateful session simulations, and network latency directly from context.

327 tools, 92 providers. Pay per call via x402 + MPP. One MCP endpoint.

API governance for AI agents. Detects breaking changes, scores blast radius, blocks unsafe calls.