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MCPJam Inspector is the local development platform for ChatGPT apps, MCP apps (Claude), and MCP servers. Build and test your apps with a full widget emulator, chat with any LLM, and inspect your server’s tools, resources, prompts, and OAuth flows. MCPJam is the fastest way to iterate on any MCP project.

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Quick Start

Start up the MCPJam inspector with a bash command

Start MCPJam Inspector

Start testing your MCP servers immediately

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MCPJam Inspector can

  • Build and test ChatGPT apps and MCP apps with a full widget emulator that supports custom UI components and interactive visualizations.
  • Test your MCP tools, prompts, and resources. Manually trigger your server features to quickly iterate on its development.
  • Validate your OAuth 2 implementation with the OAuth step by step feature.
  • Check your MCP server’s behavior against different LLMs in the LLM playground. Simulate how your server would behave in environments like Claude, ChatGPT, Gemini, and more.
  • Debug JSON-RPC messages sent back and forth between your server and client.
MCPJam Inspector Logo

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Key features

CapabilityDescription
Multi-protocol serversConnect to STDIO, SSE, and streamable HTTP MCP servers.
Flexible authSupports OAuth 2.1 and bearer tokens, including custom scopes and client credentials.
Rich configurationConfigure environment variables, custom headers, and timeouts.
Manual tool invocationManually invoke MCP tools, resources, resource templates, and elicitation flows.
Server infoView server icons, version, capabilities, instructions, and ChatGPT widget metadata exposed by the server.
LLM playgroundIntegrated chat playground with OpenAI, Anthropic Claude, and Ollama model support. Test how your MCP server would behave against an LLM
DebuggingComprehensive logging, tracing, and error reporting for MCP server development
Developer experienceConnect to multiple MCP servers. Save configurations. Upgraded UI/UX for modern dev experience.