Testing

MCPJam Inspector

Local development and testing tool for MCP servers and AI agent applications.

mcpjam.com

Verified Free tier

Quick facts
What is it	Local development and testing tool for MCP servers and AI agent applications.
Pricing	Freemium
Free tier	Yes
Platform	Web Application
Best for	Testing MCP server behavior before deployment, Debugging AI agent tool calls and responses
Domain registered	2025

Data updated Aug. 1, 2026

What does MCPJam Inspector do?

MCPJam Inspector is a web-based development tool built for testing and debugging MCP (Model Context Protocol) servers and the AI agent applications that rely on them. It lets developers see exactly how their software will behave when an AI like ChatGPT or Claude tries to use its tools, all before real users ever interact with it. You can run local servers, make direct tool calls, and inspect the raw JSON-RPC requests and responses to catch errors early.

The tool works by providing a local AI chat client where you can send prompts to models like GPT-4o, Claude Opus, or Gemini. It shows you which tools the agent picks, what arguments it passes, and what your server returns, complete with latency and token usage metrics. A standout feature is its detailed OAuth flow tracer, which logs every redirect and token exchange, helping you validate authentication against different protocol specs. You can also preview how your tool's UI will render in actual clients like ChatGPT, toggling between styles and screen sizes.

This tool is most useful for developers and teams building AI-powered applications or MCP servers. It turns the opaque process of agent interaction into something you can inspect and verify. Real-world use includes ensuring a new MCP tool works correctly across different AI models, debugging why an agent fails to call a specific function, or validating that a complex OAuth setup conforms to the latest protocol specifications before shipping to users.

Developer Tools LLM Testing

#ai agent development#chatgpt apps#claude-apps#json-rpc#local development#mcp-testing#oauth-debugging

Key features

What makes it stand out

Directly inspect JSON-RPC tool calls and responses

Chat with AI models (GPT, Claude, Gemini) to test agent behavior

Preview rendered UI with full client configurability

Trace entire OAuth authentication flows step-by-step

Integrate with local-to-production tunnels for real client testing

Who is MCPJam Inspector for?

Who benefits most from this tool

Testing MCP server behavior before deployment

Debugging AI agent tool calls and responses

Validating OAuth flows for AI applications

Pricing

Free tier available — start without a credit card

Free

1 seats
3 projects
Inspector
Visual OAuth Debugger
JSON-RPC Logger & SDK
MCPJam Public Server Registry
Learning Platform
MCP Newsletter
Open Source on GitHub

Enterprise

Custom

Everything in Free, plus:

Custom seats
Custom usage
Custom projects
SSO / SAML & uptime SLA
Negotiated seats & projects
Negotiated usage & LLM budget
Cloud, hybrid, or self-hosted
Custom DPA, RBAC, audit retention & compliance

Trust & presence

Domain Domain registered 2025

Gallery

Click any image to enlarge

MCPJam Inspector — pricing page — Pricing page

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