Claude Code Changelogs Recent Archive Source-level · unofficial Updates
← All changelogs v2.0.46
Claude Code · Source-level changelog

Version 2.0.46

Version 2.0.46 introduces effort level configuration - a new feature that allows users to control Claude's reasoning intensity through CLI flags, environment variables, or settings files. This release also includes internal improvements to image compression reliability and code modernization.

Package @anthropic-ai/claude-code Diff v2.0.45 → v2.0.46
5
Features & Changes
0
Bug Fixes
0
In Development
0
Env Vars / Flags

Changes

5 items

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

Enhanced Image Compression Format Handling #

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

Date Format Token Validation #

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

Import Statement Modernization #

  • 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

Code Refactoring #

  • 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