Claude Code v2.0.46

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

What: Image compression now explicitly passes the original file's media type to prevent format detection failures

Details:

• Caller (Fw5() at line 315499) now extracts file extension and constructs media type string before compression
• Function kiQ() at line 156042 (renamed from TiQ) accepts new media type parameter and forwards to compression handler
• Prevents incorrect format handling when Sharp's automatic detection fails (e.g., PNG images incorrectly treated as JPEG)
• No user-facing API changes - internal reliability improvement
• Evidence: Function signature changed from TiQ(A, Q) at line 156040 in v2.0.45 to kiQ(A, Q, B) at line 156042 in v2.0.46

What: Implemented validation for deprecated uppercase date format tokens

Details:

• Function vB9() at line 458852 now validates year tokens (Y, YY, YYYY)
• Warns users when using deprecated uppercase tokens that should be lowercase
• Prevents confusion between ISO week-numbering years (Y) and calendar years (y)
• Previously stubbed in v2.0.45 (vB9 = () => {} at line 458887), now fully implemented
• Part of date-fns Unicode token validation system
• Evidence: Implementation added at vB9() at line 458852, used in format validation at line 458914

• Migrated from default imports to named imports in multiple modules for better tree-shaking
• Examples: import { Transform as Xw6 } from "node:stream" at line 225107, import { spawn as WH5, spawnSync as XH5 } from "child_process" at line 303217
• No new module dependencies added - all imports from existing Node.js standard library
• Both import styles coexist during transition period

• Renamed function HG1() to EG1() at line 494207 for global hooks configuration getter
• Various internal identifier changes due to minification/obfuscation updates
• No functional behavior changes from refactoring