Claude Code 2.1.274 ends MCP 5-minute timeouts, self-heals sessions
The Sept 17 patch also warns on low memory before it hangs and adds an MCP startup knob — as Vercel guts build cold-starts and Snap dates its AR Specs.
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The 5-minute MCP timeout is finally dead
MCP tool calls no longer get killed at the 5-minute mark — the hard timeout that cut off long builds, migrations, and browser-driving tools is fixed in 2.1.274. Sessions that used to get stuck retrying 'unexpected tool_use_id' errors now self-heal by repairing the corrupted transcript instead of looping forever.
It warns you before it runs out of memory
New critical memory warnings fire when Claude Code is close to exhausting RAM, with concrete steps to free it or restart — the end of silent hangs on big monorepos. A new CLAUDE_CODE_MCP_STARTUP_WAIT_MS env var also lets you give slow MCP servers more time to connect at launch.
Vercel Secure Compute builds cold-start in 2.4s now
Prewarmed containers dropped the time from deploy creation to build start from 6.7s to 2.4s — real minutes back if you ship dozens of previews a day. Vercel also added a native Mem0 integration on its marketplace, so agents get persistent memory without you standing up a store.
Free-tier Vercel starts deleting your idle deploys
Hobby accounts over the 10GB storage limit will now have inactive deployments auto-deleted to pull you back under the free cap. If any old preview URLs need to stay live, check your usage — this is a quiet quota change, not just housekeeping.
Elsewhere: Snap's true-AR Specs get a date and a build stack
Snap gave its standalone AR Specs an in-depth reveal on Sept 16: $2,195, shipping 'later this fall,' with a free Specs Intelligence assistant. If you want lenses ready on day one, the stack is already live — Snap OS 2.0, a conversational Lens Studio AI that writes and debugs lenses, and Supabase-backed Snap Cloud.