MCPFlo: Open-Source Tool for Testing MCP Servers
harshalslimaye · reddit · 2026-07-13
The author released MCPFlo, an offline-first, open-source client for testing and debugging MCP servers.
It addresses the issue of developers merely glancing at a JSON response and assuming it "looks about right," which isn't a reliable testing method. MCPFlo aims to provide a more deterministic pass/fail experience, featuring:
- Conversion of nested schemas into actionable forms, rather than just offering a JSON text box.
- Chai.js-style assertions for deterministic validation of tool responses.
- Token budget visualization to monitor context window consumption.
- OAuth support for testing MCP servers that require authentication.
The author highlights that it is MIT licensed, requires no login, and operates locally without cloud dependencies. While the project is still a bit rough around the edges, it is functional, with both the website and GitHub repo publicly available.
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