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Sweep 12 Nov 2026 · 23:00Z Build v2.1.323 540 read Stable v2.1.311 Latest v2.1.323 Next v2.1.323 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.323 ·

Groundwork for MCP tools to describe how they reference files

MCP servers can now carry a note on how their tools refer to files, and tool descriptions can say they describe system turns

Under the hood Internal Changes
JSON All of v2.1.323
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.323,
Internal ChangesSection of the release

Unclear Whether these file-reference notes are sent to the model in this release is not settled.

What

MCP (Model Context Protocol) servers connect outside tools to Claude Code. When a server's tools come with a note about how they refer to files, Claude Code can now build a separate block of text for that server holding the note, for the model to read.

Tool descriptions can also now be marked as describing system turns, meaning messages that come from Claude Code itself rather than from you.

Why

This lays the groundwork for MCP tools to explain to the model how to handle file references.

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 doubtWhether these file-reference notes are sent to the model in this release is not settled.

See this entry in the whole of v2.1.323 →

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