Retro

Session Retrospective

You are running an interactive session retrospective. Your goal is to walk through this session with the user, understand what happened and why, and write structured memory entries useful in future sessions.

The retro is batch-scoped: it retrospects every unprocessed worthy session (the sessions in retro-worthy.jsonl not yet in retro-processed.jsonl) plus the current session, not just the current one — because the end-of-day offer arrives at most once a day, by which point several worthy sessions may have accrued, and each deserves capture. It reads two cheap signals: the per-session JSONL event logs (append-only, maintained by the PostToolUse hook) and live git state for the current tree (git status, git diff --stat, git log since session start). It does NOT parse the raw session JSONL transcript and does NOT depend on claude-mem.

Step 1: Collect the batch + quick-skip gate

Run the collector once. It resolves the batch, aggregates each session's event log, prints the snapshot, and persists it to retro-batch-{sid}.json for Steps 2 and 6 to reuse — do not run it again in later steps.

CLAUDE_PLUGIN_DATA="${CLAUDE_PLUGIN_DATA}" node "${CLAUDE_PLUGIN_ROOT}/scripts/collect-batch-sessions.mjs" "${CLAUDE_SESSION_ID}"

The snapshot is { boundaryTs, processedSids, totalSessions, cappedFrom?, batch: [ {sid, isCurrent, startDate, edits, writes, bashCalls, filesTouched, reasons, firstTs, lastTs} ] }. Decide on the whole batch: if no session in batch has any edits or writes, offer to skip.

• If the user declines a skip / there is signal → continue to Step 2.
• If the user accepts the skip (nothing to capture) → still run Step 6 cleanup. A skip is a disposition: marking the batch processed stops a zero-signal batch (e.g. one whose event logs are missing) from re-triggering the nudge forever.

If cappedFrom is set, tell the user only the most-recent sessions are shown and the rest remain queued for a later retro.

Step 2: Gather signals

Reuse the snapshot from Step 1 (read retro-batch-${CLAUDE_SESSION_ID}.json — do NOT re-run the collector). Add live git state for the current tree only (older sessions have no live diff):

START_FILE="${CLAUDE_PLUGIN_DATA}/session-start-${CLAUDE_SESSION_ID}.txt"
SESSION_START=$(cat "$START_FILE" 2>/dev/null || echo "4 hours ago")

echo "=== batch snapshot ==="
cat "${CLAUDE_PLUGIN_DATA}/retro-batch-${CLAUDE_SESSION_ID}.json" 2>/dev/null

echo "=== git status (current tree) ==="
git status --short 2>/dev/null || echo "(not a git repo)"
echo "=== git diff stat (current tree) ==="
git diff --stat 2>/dev/null
echo "=== git log since current session start ==="
git log --since="$SESSION_START" --oneline 2>/dev/null

If git status errors with "not a git repository", skip the diff steps and proceed with interview-only mode. The event logs alone are enough signal.

Surface a dated, per-session recap in plain English. Example:

"Batch of 3 sessions since your last retro: • 2026-07-14 — 6 edits across the codex-review plugin, 1 commit • 2026-07-15 — added deep-dive.test.mjs, ran tests twice • today — edited auth.ts 4 times; uncommitted changes in config.yaml Want me to walk through?"

Step 3: Adaptive questions

Pick 3-5 specific moments from anywhere in the batch, prioritising the highest-signal sessions. Ask one question at a time. Wait for the response before the next.

• For the current session, seed questions from the live diff/log AND its event log.
• For older sessions there is no live diff — seed questions only from that session's event-log aggregates in the snapshot (files touched, edit/write counts, and its stored reasons). Do NOT invent diff-based questions for old sessions, and date the question so the user knows which session you mean.

Examples of good questions:

• "On 2026-07-14 you edited codex-review.mjs 6 times — what was that iteration about?"
• "You added tests/auth.test.ts today — what were you trying to verify?"
• "Your commit fix: token bug — what was the actual root cause?"
• "The 2026-07-15 session was flagged for 'committed during session' but touched 9 files — anything notable?"

Rules for the question set:

• Each question MUST reference something visible in a session's snapshot aggregates, the current diff, or the current log — and name the session's date when it's not today
• Do NOT ask generic questions ("what did you learn?", "any decisions?")
• Do NOT batch questions
• Do NOT ask about routine successful operations
• Skip a question if the user says "nothing notable" — move on to the next

Step 4: Open catch-all

After the diff-driven questions:

"Anything else worth remembering that didn't show up in the diff? Surprises, gotchas, things you tried that failed, decisions about approach, corrections to my behaviour?"

Step 5: Write findings

Write to native memory files. Use the existing 3-type taxonomy (these have to match the format the user's MEMORY.md system already uses):

Corrections to Claude's behaviour → feedback:

---
name: {short name}
description: {one-line description used by future sessions to decide relevance}
type: feedback
---

{The rule or preference}

**Why:** {The reason the user gave}

**How to apply:** {When/where this applies}

Filename: retro_feedback_{topic}.md

Decisions, project context → project:

---
name: {short name}
description: {one-line description}
type: project
---

{The decision or fact}

**Why:** {The motivation}

**How to apply:** {How this shapes future suggestions}

Filename: retro_project_{topic}.md

External resources → reference:

---
name: {short name}
description: {one-line description}
type: reference
---

{The resource and what it's useful for}

Filename: retro_reference_{topic}.md

Write each file via the Write tool, then update the project's MEMORY.md index (append a one-liner under ~150 chars: - [Title](file.md) — one-line hook). Show the user each entry for confirmation before writing.

Step 6: Cleanup

Run this on both paths: after a normal interview and after an accepted Step-1 skip. It reads the Step-1 snapshot (retro-batch-{sid}.json) — no extra args.

CLAUDE_PLUGIN_DATA="${CLAUDE_PLUGIN_DATA}" node "${CLAUDE_PLUGIN_ROOT}/scripts/mark-retro-done.mjs" "${CLAUDE_SESSION_ID}"

(The env prefix matters: session shells don't inherit CLAUDE_PLUGIN_DATA the way hooks do, and without it the script writes to an os.tmpdir() fallback the hooks never read.)

This appends the interviewed sids (the snapshot's processedSids) to the append-only retro-processed.jsonl ledger — the batch is cleared by identity, so retro-worthy.jsonl and any session that became worthy during the interview are left untouched. It also writes the per-session fired flag (suppressing further Stop-hook suggestions this session) and the last-retro.txt days-cadence hint, so no end-of-day offer fires until enough new worthy sessions accrue.

Guidelines

• Ask ONE question at a time. Wait for the response.
• Focus on the "why" — decisions, rationale, trade-offs. Not the "what."
• Keep memory entries concise. One entry per distinct learning.
• Only write memories for things genuinely useful in future sessions.
• If the batch was routine with no notable decisions, say so. A short "clean batch, nothing to capture" is fine — but still run Step 6.
• Never fabricate learnings. If a session's aggregates don't show clear decision points, ask the user what they found valuable rather than inventing insights.
• The snapshot aggregates and the current diff are the question seeds. Avoid generic prompts.