MCP Inspector
What is Testra Inspector?
Testra Inspector is a web-based tool that lets you interactively test and debug MCP servers. It provides a live interface to send requests, view responses, check server health, and validate that endpoints behave correctly, all without writing code.
It’s designed to help developers quickly verify server functionality, diagnose issues, and understand the expected inputs and outputs for MCP-compliant endpoints.
1. Accessing the Inspector
Open testra.ai.
Navigate to any server listing in the directory.
Click the Inspect button on the server card or detail page.
2. Using the Inspector
The Inspector UI lets you run requests to all exposed MCP endpoints (
/health,/capabilities,/execute, etc.).Input sample JSON payloads or use predefined test cases.
View live response data including status codes, headers, response times, and payload content.
Request Editor
Edit or create custom request bodies in JSON.
Response Viewer
See formatted response data with syntax highlighting.
Status Codes
View HTTP status codes and error messages.
Latency Info
Measure request duration for performance testing.
Save Tests
Save frequent test inputs for quick access.
3. Benefits of Using Inspector
Quickly validate server compliance with MCP spec.
Debug input/output mismatches or unexpected errors.
Compare different server responses side-by-side.
Use as a reference while coding your integration.
4. Troubleshooting with Inspector
Use Inspector to reproduce issues reported by your application.
Check for authentication errors, malformed requests, or server errors.
Validate that all required endpoints respond as expected.
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