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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.248

Vendored Anthropic client updated with server-side compaction and new resources

Under the hood
Useful3 Signal5
Compaction Notable

The bundled API library gains server-side compaction blocks plus sessions, vaults, skills and MCP tunnel surfaces.

What

The bundled API client adds a compaction content block and streaming compaction deltas, deprecating its own client-side compaction control in favour of the server doing it, and gains sessions and threads, vaults and credentials, skills and versions, and MCP tunnels and certificates, each behind its own beta header. This is library surface inside the bundle; none of it is a Claude Code feature on its own.

Details
  • Message creation now warns when thinking.type=enabled is combined with the newer models.
Evidence

edits: [{ type: "compact_20260112" }]

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.248 →