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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 v2.1.87

0 entries read diff v2.1.86 → v2.1.87 Markdown

This is a maintenance release with no user-facing changes. The only modifications are internal refactoring of how the BriefTool (SendUserMessage) is registered in the tool list, along with minor variable renames from the minification process.

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No user-facing features, improvements, or bug fixes were identified in this release. The structural similarity between v2.1.86 and v2.1.87 is 99.9%, with only 13 additions, 13 removals, and minor structural adjustments.

The sole meaningful code change is an internal refactoring of the BriefTool registration: it was previously conditionally included in the tool list via a lazy-loaded variable (...(BHK ? [BHK] : [])), and is now included directly as a module-level reference (os1). The tool's isEnabled() gate remains unchanged, so this has no effect on behavior. The BriefTool itself (renamed internally to "SendUserMessage") continues to function identically — its entitlement check (isBriefEntitled), enablement check (isBriefEnabled), schema, and implementation are all unchanged.

Evidence

BriefTool direct inclusion (search for BriefTool: () => os1 in new version vs BriefTool: () => h8z in old version; registration change visible at the KK6() tool list function)

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

Verbatim
Official · Anthropic

Anthropic’s official release notes

Published verbatim by Anthropic for v2.1.87. Text is unmodified from the upstream changelog. Everything else on this page came out of the bundle instead, which is why the two lists don't match.

  • Fixed messages in Cowork Dispatch not getting delivered
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System prompt

The system prompt was not captured for this release, so this page cannot say whether it moved.

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