MCP Probe — MCP Server Inspector
MCP Probe inspection and debugging tool enabling developers to introspect MCP server implementations — listing available tools, testing tool calls, inspecting request/response messages, and validating MCP server behavior against the protocol spec, supporting MCP server development and troubleshooting workflows.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Inspection tool. Target credentials separate. Don't probe production with write ops. Community tool.
⚡ Reliability
Best When
An MCP server developer needs to inspect, test, and debug their MCP server's tools and protocol compliance during development.
Avoid When
You're consuming MCP servers in production — use production observability tools for monitoring.
Use Cases
- • Inspecting MCP server tool definitions from MCP developer agents
- • Testing MCP tool calls and validating responses from QA agents
- • Debugging MCP server protocol compliance from development agents
- • Documenting MCP server capabilities by introspection from documentation agents
- • Validating MCP server behavior during development from CI agents
- • Troubleshooting MCP client-server communication from support agents
Not For
- • Running as an MCP server itself (it's a diagnostic tool)
- • Production monitoring (use proper observability tools)
- • Non-MCP protocol inspection
Interface
Authentication
No authentication — connects to target MCP servers for inspection. Target server auth must be configured separately.
Pricing
Free, open source debugging tool.
Agent Metadata
Known Gotchas
- ⚠ Diagnostic tool only — cannot be used as an MCP server itself
- ⚠ Sends actual tool calls to target server — don't probe production MCP servers with write operations
- ⚠ Tool call results may have side effects depending on target server
- ⚠ Protocol version compatibility — probe must support same MCP spec version as target
- ⚠ Community tool from mcptools org — higher quality than average community project
- ⚠ Some MCP servers may not respond correctly to introspection-only clients
Alternatives
Full Evaluation Report
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Scores are editorial opinions as of 2026-03-07.