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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 v2.1.120

CLAUDE_EFFORT System Prompt Substitution

What

A new ${CLAUDE_EFFORT} template variable is now available in system prompts, dynamically resolved from the session's effort setting.

Details
  • The variable is interpolated during session initialization
  • Allows system prompts to adapt behavior based on the current effort level
Evidence

Template variable ${CLAUDE_EFFORT} appears in system prompt processing — search for "CLAUDE_EFFORT"

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

See this entry in the whole of v2.1.120 →