Effort Level Configuration

What: Control Claude's reasoning effort/intensity for tasks through multiple configuration methods

How to use:

# Via environment variable
export CLAUDE_CODE_EFFORT_LEVEL=high
claude

# Supported values: "low", "medium", "high", or numeric values
export CLAUDE_CODE_EFFORT_LEVEL=75
claude

# Disable with "unset"
export CLAUDE_CODE_EFFORT_LEVEL=unset
claude

Details:

• Configuration priority: CLI flags (highest) → environment variable → settings file (lowest)
• Set via CLAUDE_CODE_EFFORT_LEVEL environment variable
• Configure in settings file with effortLevel field
• Supports string presets: "low", "medium", "high"
• Supports numeric values (integers)
• Use "unset" to explicitly disable effort configuration
• Integrates with Claude API's output_config.effort parameter using beta flag effort-2025-11-24
• Evidence: New function a10() at line 341081 retrieves configuration from multiple sources; function nR3() at line 491217 sets API parameters; replaces empty stub uR3() at line 491090 from v2.0.45