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Comment: MCP was always a bad idea? Simon Willison’s Weblog Subscribe 20th September 2026 Comment My comment on MCP was always a bad idea? — Hacker News This article entirely misses the value that MCP brings today. Sure, there's almost no reason to use MCPs if you are running a full-blown terminal agent (Claude Code, Codex, Meta Muse, OpenClaw etc) with unfettered internet access - just let it call APIs directly. If you want to operate something that's less YOLO than that, you'll find yourself wanting: Control over exactly which external services it can access A way to handle authentication that doesn't allow the agent to directly access API keys A sensible UI to allow users to connect and authenticate further services Strong audit logging for what's going on MCP makes all of that so much easier to provide. Thinking MCP is obsolete because full coding agents don't need it misses out on all of the other things we might want to build. Recent articles Generating running routes with GPT-6 Astra and ChatGPT Work - 12th September 2026 OpenAI agents attacked RubyGems back in May - 12th September 2026 Some thoughts on the Navier–Stokes Millennium Prize Problem - 8th September 2026 This is a beat by Simon Willison, posted on 20th September 2026. hacker-news 44 model-context-protocol 36 Monthly briefing Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments. Pay me to send you less! Sponsor & subscribe Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026