inspector
MCPJam Inspector is a local development client/emulator for ChatGPT Apps SDK and MCP apps/servers, providing an interactive widget emulator, MCP JSON-RPC tool/resource debugging, an OAuth flow debugger, and an LLM playground to test MCP servers against various models.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
No information is provided about how the tool handles secrets (API keys, OAuth tokens), TLS usage details, dependency scanning/CVE posture, or whether it logs sensitive OAuth/token data. Since it includes an OAuth debugger and an LLM playground, there is an inherent risk of credential exposure via logs/UI if not carefully designed, but this cannot be confirmed from the provided content.
⚡ Reliability
Best When
You are iterating on an MCP server or ChatGPT/MCP app integration and need local, protocol-level visibility (JSON-RPC + OAuth) and a fast emulation/test loop.
Avoid When
You need a documented public REST/GraphQL API contract to integrate this tool directly as a backend dependency in your systems.
Use Cases
- • Emulate and test ChatGPT Apps/Widgets locally
- • Debug MCP server tools/resources/prompts via JSON-RPC logs
- • Inspect and troubleshoot OAuth handshakes for MCP servers/flows
- • Test MCP servers against different LLM providers/models
- • Verify server-exposed metadata (capabilities, instructions, widget metadata)
Not For
- • Not a hosted API service for production inference workloads
- • Not a security scanner/auditor for third-party code
- • Not a substitute for implementing your own OAuth/token verification in the MCP server
Interface
Authentication
The README describes an OAuth debugger feature, but it does not document any authentication method required to use the inspector itself (e.g., API keys) nor any scope model for accessing inspector capabilities.
Pricing
The README claims certain 'frontier models' are provided for free in the LLM playground, and also supports 'bring your own API key', but it does not provide a formal pricing/tiers breakdown.
Agent Metadata
Known Gotchas
- ⚠ Inspector is primarily a local UI/emulator rather than a programmatic service with documented endpoints; AI agents may need UI automation or reverse-engineering to operate it headlessly.
Alternatives
Full Evaluation Report
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Scores are editorial opinions as of 2026-03-30.