Building an MCP Server for Codex: Frameworks and Best Practices
Embarrassed_Cut_1008 · reddit · 2026-08-12
Working on an interview assignment to build a local MCP Server for natural language dataset querying, the author asks the community for best practices, especially for coding agents like Codex:
- Frameworks: Is FastMCP the current go-to, or is it better to build without a framework for more control?
- Focus: What should be prioritized in a small assignment—clean tool design, retrieval logic, business value, or error handling?
- Pitfalls: What are common mistakes when building MCP servers for agents like Codex or Claude Code?
The author's current instinct is to keep it simple, expose a few well-designed tools, and focus on demonstrating good reasoning around tradeoffs.
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