Source Intelligence

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.

All of v2.1.86 Home All releases olderv2.1.85 v2.1.87newer
Claude Code v2.1.86

Context Window Usage Breakdown

What

A new command that provides a breakdown of your current context window usage by category (system prompt, tools, messages, etc.).

Details
  • Shows how your context budget is being consumed across different categories
  • Useful for understanding why you're running low on context or for optimizing long sessions
Evidence

Context window command (search for "Breakdown of current context window usage by category")

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

See this entry in the whole of v2.1.86 →