Claude Code v2.1.120 ·
CLAUDE_EFFORT System Prompt Substitution
EntryKind: in v2.1.120,
ChangesSection of the release
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.
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeSkills can now reference the current effort level with ${CLAUDE_EFFORT} in their content
See this entry in the whole of v2.1.120 →
