ticket-retro

name	ticket-retro
description	Cross-ticket retrospective VIEW (CTL-789 Loop C / CTL-814). **ALWAYS use when** a ticket's PR has just merged (the workflow's compound closing step — runs automatically per ticket, CTL-831), or when the user says 'ticket retro', 'run a retro', 'retrospective', 'what did we learn lately', or 'how are the estimates calibrating'. Synthesizes everything the compound loops captured since the last retro — friction logs, learnings, compound-log calibration, catalyst.db / merged-PR actuals — into thoughts/shared/retros/ticket/<date>.md with a persisted watch-items block, and surfaces top patterns in the morning briefing's Plan today.
allowed-tools	Bash, Read, Write, Grep, Glob

Ticket Retro — the cross-ticket compound view

Loop C of compound engineering: a human-readable reflection across a SET of tickets. It mostly reads what Loop B (friction logs, learnings) and Loop A (compound-log, estimation corpus) captured, then writes ONE artifact: the retro document.

Runs automatically per ticket (CTL-831): merge-pr step 12b and phase-monitor-merge invoke this skill right after the compound-log entry lands, so the system learns from every ticket it ships without being asked. Best-effort in those contexts — a retro failure never blocks a merge or a phase. Several merges per day are normal: same-day re-runs REGENERATE today's file cumulatively (the gather floor skips today — see Step 3).

Hard contract — read-only VIEW:

• The ONLY thing this skill writes is thoughts/shared/retros/ticket/<YYYY-MM-DD>.md.
• It must NOT curate the learnings store, edit thoughts/shared/CONCEPTS.md, or touch ADRs — that is ticket-compound's job (per-ticket curator). No Linear writes, no corpus writes.
• Every input store degrades to _none_ — empty stores are the normal early state, never an error.

Invocation

/catalyst-dev:ticket-retro                      # since-last-retro (default scope)
/catalyst-dev:ticket-retro --since 2026-06-01   # explicit window floor
/catalyst-dev:ticket-retro --tickets CTL-1,CTL-2  # explicit ticket set (all time)

Default scope is since-last-retro, no time box (solo-dev rhythm — design decision, plan line 114): the window floor is the date of the most recent retro in thoughts/shared/retros/ticket/; the first retro ever falls back to 14 days.

Step 1: Gather (deterministic, read-only)

All reads go through the gather helper — one JSON document, every section degrades to empty:

GATHER="${CLAUDE_PLUGIN_ROOT:-plugins/dev}/scripts/ticket-retro/gather-retro.sh"
RETRO_JSON=$(mktemp)
bash "$GATHER" --thoughts-dir thoughts "$@" > "$RETRO_JSON"
jq '{window, prior_retro: (.prior_retro != null), friction: (.friction|length),
     learnings: (.learnings|length), calibration: (.calibration.entries // 0),
     merged_prs: (.merged_prs|length), db_stats: (.db_stats|length)}' "$RETRO_JSON"

What it returns (see the script header for the full shape):

Key	Source	Degrades to
window	latest retros/YYYY-MM-DD.md / --since / --tickets	14-day default
prior_retro.watch_items	the previous retro's fenced yaml watch-items block	null
friction[]	thoughts/shared/friction/*.md (## <phase> · <TICKET> · <ISO-8601> records after the floor)	[]
learnings[]	thoughts/shared/learnings/** frontmatter, mtime after the floor	[]
calibration	compound-log.sh aggregate (estimate_at_start vs estimate_actual)	{}
merged_prs[]	gh pr list --state merged in-window, ticket id from branch/title	[]
db_stats[]	~/catalyst/catalyst.db sessions⋈session_metrics per ticket (SPARSE — see note)	[]

Actuals note: db_stats covers only orchestrator-run tickets with metrics rows (historically ~13 of 333). merged_prs[].additions/deletions (diff churn) is the universal actuals fallback — use it for the aggregate stats; treat db cost/hours as a bonus column where present.

Step 2: Synthesize (your judgment — this is the LLM half)

1. What we did — group merged_prs by ticket; one line each. Failed/abandoned tickets that show up in friction but not in merged_prs belong here too (often highest-signal).
2. Recurring friction patterns — cluster friction[].line entries that describe the same underlying problem (same component, same failure shape — NOT necessarily same wording). A pattern needs ≥2 records (across tickets or phases). One-off frictions are listed only if severe. For each pattern: a name, the supporting records (ticket·phase), and one sentence of synthesis.
3. Watch-item recurrence — for each prior_retro.watch_items[] pattern, check whether this window's friction/learnings show it again. Verdict per item: recurred (cite evidence), quiet (no sighting), or resolved (a learning/ADR/fix landed that addresses it — cite it).
4. Estimation calibration — from calibration: count/exact/mean-signed-delta/median-abs-delta plus a per-ticket start→actual table. When calibration.entries == 0, render _none_ and note the sink fills at merge (merge-pr 12b / phase-monitor-merge).
5. Next watch items — carry forward unresolved prior items (keep their first_seen) and add new patterns from (2) worth tracking. Cap at ~7 — a watch list longer than that is a backlog, not a watch list.

Step 3: Write the retro document

Path: thoughts/shared/retros/ticket/<YYYY-MM-DD>.md (today UTC). If today's file already exists, OVERWRITE it — the gather floor deliberately skips today's retro (CTL-831), so a same-day re-run covers the same since-prior-retro window plus whatever just merged; today's file is always the cumulative day view, never a near-empty increment. Template:

---
date: <YYYY-MM-DD>
type: retro
generated_by: ticket-retro
window_since: <window.since>
window_source: <window.source>
tickets_shipped: <N>
---

# Ticket Retro — <YYYY-MM-DD>

Window: <window.since> → today (<window.source>)

## What we did

- `CTL-x` title — #PR (+adds/−dels)
- …                                      (_none_ when empty)

## Aggregate stats

| Metric | Value |
|---|---|
| Tickets shipped | N |
| Diff churn (LOC) | +A / −D |
| Sessions / cost / hours (catalyst.db, sparse) | N / $C / H |

## Recurring friction patterns

- **<pattern name>** (N records: CTL-a·research, CTL-b·implement) — one-sentence synthesis.
- …                                      (_none_ when empty)

## What we learned

- [component] title — `path`             (_none_ when empty)

## Estimation calibration

entries: N · exact: N · mean signed delta: +X.X · median |delta|: X

| Ticket | start | actual | Δ |
|---|---|---|---|
…                                        (_none_ when empty)

## Watch items from last retro

- ✅ resolved / 🔁 recurred / 💤 quiet — <pattern> (evidence)
…                                        (_no prior retro_ on the first run)

## Watch items

```yaml watch-items
- pattern: "<short greppable description>"
  component: <orchestrator|phase-agent|broker|monitor|cli|ci|worktree|linear|execution-core|estimation|website|plugins>
  first_seen: <YYYY-MM-DD of when it first appeared — preserve across retros>
  source: <TICKET the clearest record came from>

**The watch-items block is the only stateful contract.** The next retro and the morning briefing
both machine-parse it: keep the exact fence info string `yaml watch-items`, the exact four keys,
and `pattern` values double-quoted. `component` uses the learnings-store enum
(`ticket-compound/reference.md`).

## Step 4: Sync + report

```bash
humanlayer thoughts sync 2>/dev/null || true
echo "ticket-retro: wrote thoughts/shared/retros/ticket/$(date -u +%Y-%m-%d).md"

Report to the user: the retro path, top 3 recurring patterns, the calibration one-liner, and any recurred watch-items. The next morning briefing surfaces the watch-items automatically (Plan today → Retro signals).

Relationship to the other compound skills

Skill	Owns	Scope
ticket-compound	learnings / CONCEPTS / ADR proposals (writes)	one ticket
compound-estimate	estimation numbers → compound-log (writes)	one PR
ticket-retro	the cross-ticket VIEW (reads both, writes only its retro doc)	a window of tickets