claude-howto/openspec/changes/fix-context-usage-hook/tasks.md

Tasks: Fix Context Usage Hook Token Calculation

Implementation Tasks

1. Fix the bug in 06-hooks/README.md example

• Update line 564 in the context-usage.py example: change estimate_tokens(str(total_chars)) to total_chars // 4
• Remove the now-unused estimate_tokens() function from the example

2. Update user's local hook file

• Fix ~/.claude/hooks/context-usage.py with the same correction

3. Verification

• Test the hook by running Claude Code and confirming non-zero token count is displayed
• Verify the percentage calculation is reasonable (should show usage increasing during conversation)

Acceptance Criteria

• After Claude responds, the Stop hook displays a non-zero token estimate
• The displayed percentage decreases as conversation grows
• Example in README.md matches the corrected implementation