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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 v2.0.71 16 Dec 2025

Improved Token Counting for Custom System Prompts

The /context command now accurately accounts for custom system prompts and appended system prompts when calculating token usage. Previously, the system prompt token count didn't consider SDK users' custom prompts.

Evidence

NK0() at line 384355 (context calculation, now uses ySA() with customSystemPrompt and appendSystemPrompt parameters)

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

See this entry in the whole of v2.0.71 →