Show HN: What the Harness? LLM agent inconsistencies in MCP implementation

Hacker News Show2026-10-21 02:400 views

Hi HN,

We (Polytomic) noticed that LLM agents (Claude, Codex, Grok, Amp, etc) are inconsistent in their MCP implementations.

We made tables inspired by the browser-compatibility tables of yore that list the differences.

Hope you find this as useful as we did!

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