Handoff Skill

When context is ~80% full (or before stopping), output a structured handoff document so the next session can resume exactly where this one left off — no re-explanation needed.

Handoff Format (STRUCTURED HANDOFF v2)

The authoritative template lives in prompt.md (Step 3) — this is the shape it produces. Saved to .claude/handoff-{YYYY-MM-DD-HH-MM}.md; /pickup parses these exact section headers.

# Handoff: {YYYY-MM-DD HH:MM}
<!-- STRUCTURED HANDOFF v2 — preserve all section headers exactly -->

## Goal
One sentence: the overall objective of this work session / task.

## Constraints & Preferences
- <technical constraints, stack choices, things explicitly NOT to do>
- <user preferences discovered this session>

## Progress
### Done ✅
- [x] <completed item with exact file path> (<short commit hash>)

### In Progress 🔄
- [ ] <item currently being worked on — what specifically remains>

### Blocked 🚫
- <specific blocker needing human input — OR "none">

## Key Decisions
- **<Decision>**: <rationale — why this over alternatives>

## Next Steps (ordered by priority)
1. <exact next action — specific file, specific change, specific command>
2. <second action>

## Critical Context
- <non-obvious codebase facts, pitfalls, configs that matter>
- <API keys or secrets needed (mention only location, never paste values)>

## Files
<read-files>
<absolute paths of files READ this session, one per line>
</read-files>

<modified-files>
<absolute paths of files MODIFIED this session, one per line>
</modified-files>

## Meta
- Branch: <git branch --show-current>
- Uncommitted: <git status -sb output, or "clean">
- Build: <passing | failing | unknown>
- Session: <approximate duration>

Subsequent handoffs are incremental: keep Goal/Constraints, move completed In-Progress items to Done ✅, update Next Steps (see prompt.md Step 2).

Rules

• Goal: Keep it to 1 paragraph. If you can't summarize it, the scope is too large.
• Key Decisions: Only record non-obvious decisions. "Used Python because it's the project language" doesn't need a note.
• Blocked: If blocked, write to .claude/blockers.md instead of leaving it in handoff.
• Secrets: Never paste actual API keys, tokens, or passwords. Just note where they are stored.
• Read/Modified files: These go in the XML-tagged sections so the next session can load them with exact context.

What Happens to the Handoff

The next session receives this via /pickup or by reading the handoff file. It should be able to:

1. Understand the current state without asking you
2. Know exactly where to pick up
3. Understand why past decisions were made