{"version":"2.1.120","anchor":"claude-effort-system-prompt-substitution","canonical_anchor":"claude-effort-system-prompt-substitution","heading":"CLAUDE_EFFORT System Prompt Substitution","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.120\/e\/claude-effort-system-prompt-substitution","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.120","markdown":"### `CLAUDE_EFFORT` System Prompt Substitution\n\n**What**\n\nA new `${CLAUDE_EFFORT}` template variable is now available in system prompts, dynamically resolved from the session's effort setting.\n\n**Details**\n\n- The variable is interpolated during session initialization\n- Allows system prompts to adapt behavior based on the current effort level\n\n**Evidence**\n\nTemplate variable `${CLAUDE_EFFORT}` appears in system prompt processing \u2014 search for `\"CLAUDE_EFFORT\"`"}