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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.309 ·

Read tools for hidden built-in MCP servers, and a PowerShell hook check removed

Claude Code now looks up read tools for hidden built-in MCP servers, and no longer special-cases PowerShell when classifying hooks

Under the hood Internal Changes
JSON All of v2.1.309
Under the hoodTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.309,
Internal ChangesSection of the release

Unclear What either change does in practice is not known.

What

Two separate changes:

  • MCP tools: MCP is a way of connecting Claude Code to outside tools and services. Where Claude Code used an empty list, it now fetches a list of read tools for hidden built-in MCP servers.
  • Hooks: hooks are commands you set to run automatically at certain points. A check that treated hooks set to run in PowerShell differently has been removed from how hook commands are classified.
Why

These affect which MCP read tools are available and how PowerShell hooks are handled.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhat either change does in practice is not known.

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