usage-checkpointlisted

# usage:checkpoint Mark a checkpoint to split usage into segments. Each checkpoint captures cumulative usage at that point; the difference between consecutive checkpoints becomes the segment usage. ## Trigger - "usage checkpoint {label}" - "체크포인트 {label}" - "구간 표시" ## Parameters - **label** (required): Segment name (e.g., "Step 4 C-001 작성", "BE 교차검증") - **taskId** (optional): Task to checkpoint. If omitted and only one active task, uses that one. ## Procedure ### 1. Load tasks and identify target ```bash cat "$HOME/.claude/usage-tracker/tasks.json" ``` Find target task (active only). If ambiguous, list and ask. ### 2. Query current cumulative usage ```bash ccusage session --since {task.startedAt as YYYYMMDD} --json --breakdown ``` Match sessions by task's binding projects. Calculate cumulative totals: - **cumulativeTokens**: sum of totalTokens across matched sessions - **cumulativeCost**: sum of totalCost ### 3. Calculate segment usage If previous checkpoints exist, segment = current cumulative - last checkpoint cumulative. If no previous checkpoints, segment = current cumulative - 0 (i.e., from task start). ``` segmentTokens = cumulativeTokens - lastCheckpoint.cumulativeTokens (or 0) segmentCost = cumulativeCost - lastCheckpoint.cumulativeCost (or 0) ``` ### 4. Write checkpoint to tasks.json Add to the task's `checkpoints` array (create if not exists): ```json { "checkpoints": [ { "label": "{label}", "createdAt": "{ISO timestamp}", "