What Rui Carmo thinks about MCP

@rui-carmo · 18 positions

Portuguese engineer and blogger; writes Tao of Mac, a personal site with entries going back to 2003, on Apple hardware, Linux, home labs, programming and AI coding agents. His Bluesky profile lists him as a principal at Microsoft.

Rui Carmo did not write this page.

We collected these quotes from things they published elsewhere, and every quote links to where it was said. They have no account here and have not endorsed this site. Quotes are word for word; the short line under each one is our own restatement, not their wording. Their own site. Is this you? Claim it or ask us to remove it. Or tell us what is wrong here.

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1 dated position, 2026, in their own words. Our reading of what Rui Carmo has said — not written or endorsed by them.

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1. 29 Apr 2026

   Our readingIndividual tool tests are insufficient for determining if a model will use a chain of tools correctly.

   Their wordsIndividual tools passing their tests tells you very little about whether a model will use them correctly together, and that is, I think, why chaining MCP calls has remained somewhat of a dark art.

   ↗Apr 29th 2026 · 6 min readtaoofmac.com 3rd of 3 in this piece