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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 v2.1.21 28 Jan 2026

Task List ID Ordering

What

Task list documentation now recommends working on tasks in ID order (lowest first) when multiple tasks are available.

Details

New .highwatermark file for tracking task ID generation
Documentation updated to say "Prefer working on tasks in ID order (lowest ID first)"
Helps teams coordinate work more predictably
Part of the teammate workflow system

Evidence

Co3 = ".highwatermark" at line 155744 (highwatermark constant), string literal "Prefer working on tasks in ID order" in TaskList tool description

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

See this entry in the whole of v2.1.21 →