fix: add CLAUDE_WORKING_DIR support to main action

[TomokiIchi]

Summary

• Add CLAUDE_WORKING_DIR environment variable support to the main composite action (action.yml)
• The base-action/action.yml already has this feature (L156-160), but the main action was missing it after the refactor in feat: integrate claude-code-base-action as local subaction #285
• This is a 4-line addition that checks for CLAUDE_WORKING_DIR and cds to it before running the entrypoint

Motivation

Monorepo users need to run Claude Code in a subdirectory (e.g., systems/journey within a larger repo). The CLAUDE_WORKING_DIR environment variable was designed for this, but currently only works with claude-code-base-action, not the main claude-code-action.

This causes Claude Code to:

• Start in the repository root instead of the intended subdirectory
• Miss project-specific .claude/ configurations (CLAUDE.md, settings, skills)
• Require workarounds like prompt-based cd instructions

Changes

Added the same CLAUDE_WORKING_DIR check from base-action/action.yml to the main action.yml:

if [ -n "$CLAUDE_WORKING_DIR" ]; then
  echo "Changing directory to CLAUDE_WORKING_DIR: $CLAUDE_WORKING_DIR"
  cd "$CLAUDE_WORKING_DIR"
fi

The guard (if [ -n ... ]) ensures no behavior change when the variable is not set.

Usage

- uses: anthropics/claude-code-action@v1
  env:
    CLAUDE_WORKING_DIR: ${{ github.workspace }}/my-subdirectory

Fixes #315

[TomokiIchi]

Hello! Thank you for maintaining this project.
I've added support for CLAUDE_WORKING_DIR to the main action to fix #315.
Please let me know if there is anything I need to change, fix, or if I missed any contribution guidelines. I'd be happy to make any necessary updates.

Thank you for your time and for this awesome project!