MCPJam Inspector

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MCPJam Inspector is a coding & development tool that helps test and debug MCP servers and ChatGPT apps. It allows developers to inspect, test, and evaluate app performance across modern MCP clients.

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At a glance

Pricing

Freemium · Enterprise

Free tier

Yes

API

Yes

Skill level

Technical

About

What is MCPJam Inspector?

MCPJam Inspector is a comprehensive tool designed for developers to test, debug, and evaluate MCP servers and ChatGPT applications locally. It enables inspection of how servers and apps perform across various modern MCP clients, including ChatGPT, Claude, and Cursor. Key features include an Apps Inspector for direct tool execution and model-in-the-loop interactions, an OAuth Debugger to visualize and verify authorization flows, and a Chat Playground for interacting with MCP apps using frontier models. Developers can inspect traces, tool calls, inputs, outputs, app-to-host messages, and rendered UI, accelerating the iteration loop without needing external services like ngrok or a ChatGPT subscription.

Best used for

Ideal for developers who need to thoroughly test MCP servers, debug ChatGPT applications, and evaluate app performance across various clients. Especially valuable for ensuring OAuth compliance and iterating quickly on app development without external dependencies.

Common actions

debug applications

test servers

evaluate performance

inspect tool calls

verify authorization

GitHubDeveloper Toolsopen-source

Capabilities

Key features

Inspect MCP servers
Debug ChatGPT apps
Visualize OAuth flows
Chat playground testing
JSON-RPC logging
CI/CD eval runs

Target Audience

developer

Integrations

Not yet documented

Pricing & Plans

Freemium · Enterprise

Community version is free. Check [mcpjam.com] for current pricing.

FAQs

What is the difference between annual and monthly billing?

Annual billing offers a 20% discount compared to monthly billing, which charges each month at the list rate. You can switch your billing interval when subscribing via checkout, where supported, to choose the option that best fits your budget and needs.

What are Evals CI/CD runs?

Evals CI/CD runs are automated executions of your evaluation suites within MCPJam’s continuous integration/continuous deployment flow. The Free plan includes a small monthly allowance, while Starter and Team plans offer larger bundles with options for overage, and Enterprise plans can negotiate custom volumes.

What are Chatboxes and how do they work?

Chatboxes are isolated chat environments configured with your MCP servers, including a welcome modal and user feedback form. They provide a shareable link for testers to try your setup, allowing you to gather aggregate usage data and real human feedback. Starter and Team plans include limited deployments and uptime hours.

Is LLM usage included in MCPJam plans?

Yes, both open and frontier models are included across all plans. Usage is rate-limited on the free tier, while Starter and Team plans provide generous daily LLM credits per user. Enterprise plans offer custom usage agreements to meet specific organizational needs.

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Open Source & Models Code Assistants DevOps & Infrastructure No-Code / Low-Code Backend & APIs Prompt Engineering

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AI Agents & Automation › AI Frameworks & Infra

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