Postcompact

Compaction summaries preserve facts but lose nuance. This skill recovers what was lost by dispatching a subagent to read the full conversation transcript.

On Activation

1. Find the transcript

The compaction summary includes a line like:

read the full transcript at: /path/to/session.jsonl

Extract that path. If not found, check for .jsonl files in ~/.claude/projects/ matching the current project.

2. Dispatch a research subagent

Launch a foreground Agent to read the transcript and extract what the compaction summary missed:

• What was being worked on and what was the next step
• Reasoning behind decisions, not just the decisions
• Corrections and warnings from the user
• Implicit commitments ("we should also...", "after this...")
• Tone — exploratory? heads-down? frustrated?
• Active artifacts — file paths, branches, commits, PRs

Tell the agent to focus on the most recent messages and to do research only (no edits).

3. Synthesize and present

Distill what the subagent found into what matters for continuing the conversation. Don't parrot the raw output.

Do

• Use a foreground subagent (you need results before proceeding)
• Prioritize the end of the transcript (most recent = most relevant)
• Surface corrections and warnings prominently

Don't

• Read the transcript directly (too large for your context)
• Duplicate what the compaction summary already covers
• Ask questions — the user wants context recovered, not a quiz