Lightweight retrospective. Reads a completed epic doc or quick record, synthesises observations, and writes a retro file for feed-forward into the next planning cycle. Promotes durable lessons into the reference library via "/cpm:retro learn" and retires spent lessons via "/cpm:retro retire". Triggers on "/cpm:retro".
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Lightweight retrospective. Reads a completed epic doc or quick record, synthesises observations, and writes a retro file for feed-forward into the next planning cycle. Promotes durable lessons into the reference library via "/cpm:retro learn" and retires spent lessons via "/cpm:retro retire". Triggers on "/cpm:retro".
Lightweight Retrospective
Read a completed (or partially completed) epic doc, synthesise observations captured during task execution, and produce a retro file that feeds forward into the next planning cycle.
Input
This skill operates on two source types: epic docs (docs/epics/) and quick records (docs/quick/). Both produce retro-eligible observations during execution; the retro skill consumes either kind.
This skill has four mutually exclusive modes, selected by $ARGUMENTS:
Synthesis (the default) — read a completed source and write a retro file from its observations. This is everything documented below from Process onward.
Lesson promotion (learn) — promote a durable lesson out of an existing retro into the reference library, then retire it at the source. This is a separate flow; see the Lesson Promotion (learn action) section below.
Lesson retirement (retire) — retire a spent lesson at its source: mark it with a durable **Retired** marker so it stops resurfacing in Retro Awareness, without deleting it or losing the audit trail. Use this when a lesson is no longer true anywhere — the module it warned about is gone, the constraint no longer holds, the pattern was superseded. This is the deliberate, out-of-cycle home for retirement (cpm:do's in-cycle Obsolete retire is the rare exception). See the section below.
Lesson Retirement (retire action)
Triage (triage) — scan the project's completed epics and waive the ones that don't warrant a retro (clean epics with no lessons to synthesise), so the board and /cpm:status stop nagging them as "retro pending". Writes a durable epic-level **Retro waived**: marker; never synthesises, promotes, or retires. See the Triage (triage action) section below.
The four never run together: synthesis produces a retro from execution observations; learn graduates an observation into permanent reference (and retires it as it goes); retire retires a spent observation outright; triage waives clean completed epics so they stop asking for a retro. Decide the mode first:
If $ARGUMENTS is exactly learn, or begins with learn followed by an optional retro path/filter (e.g. learn, learn docs/retros/04-retro-foo.md), enter the Lesson Promotion (learn action) flow and ignore the synthesis steps. Any trailing text after learn is treated as an optional scope hint (a retro path or keyword) for candidate gathering, not as a synthesis source.
If $ARGUMENTS is exactly retire, or begins with retire followed by an optional retro path/filter (e.g. retire, retire docs/retros/04-retro-foo.md), enter the Lesson Retirement (retire action) flow and ignore the synthesis steps. Any trailing text after retire is treated as an optional scope hint (a retro path or keyword) for candidate gathering, not as a synthesis source.
If $ARGUMENTS is exactly triage, or begins with triage followed by an optional path/filter (e.g. triage, triage docs/epics/01-01-epic-foo.md), enter the Triage (triage action) flow and ignore the synthesis steps. Any trailing text after triage is an optional scope hint (an epic path or keyword) that narrows which completed epics are scanned, not a synthesis source.
Otherwise, run synthesis. Check for input in this order:
If $ARGUMENTS references a file path, use it. Accept paths under docs/epics/ (epic doc) or docs/quick/ (quick record).
If no path given, look for the most recent file across bothdocs/epics/*-epic-*.md and docs/quick/*-quick-*.md (compare by filename prefix or modification time). Present the most recent candidate(s) to the user with AskUserQuestion to confirm.
If neither directory has matching files, tell the user there's nothing to retro and stop.
Source detection: Once the input is resolved, classify it by directory or filename pattern:
Epic source (docs/epics/...-epic-...md): observations live in **Retro**: fields on completed stories and the optional ## Lessons section. Steps 1-3 below apply as written.
Quick source (docs/quick/...-quick-...md): observations live in the record's ## Retro section (mandatory single-category observation). Steps 1-3 still apply, with adjustments noted inline.
Process
State tracking: Create the progress file before Step 1 and update it after each step completes. See State Management below for the format and rationale. Delete the progress file once the final retro file has been saved.
Stale-Progress Check (Startup)
Follow the shared Stale-Progress Check procedure (from the CPM Shared Skill Conventions loaded at session start).
Template Hint (Startup)
Before Step 1, display:
Output format is fixed (used by downstream skills). Run /cpm:templates preview retro to see the format.
Step 1: Read Source Document
Read the resolved source document with the Read tool.
For epic sources (docs/epics/), identify:
Total number of stories and their statuses (Pending, In Progress, Complete)
Any **Retro**: fields on completed stories (these are per-story observations captured by cpm:do Step 6, Part B — mandatory on verification gates)
Any ## Lessons section already present (batch summary from cpm:do Step 8)
The overall completion state of the batch
For quick sources (docs/quick/), identify:
The change description, classification (fix or change), and verification summary
The ## Retro section's observation — a single category and one-sentence observation per the format defined by cpm:quick
Whether the change shipped successfully (record promoted to completion record per cpm:quick Step 4)
Present a brief summary to the user — for epic sources: story counts, completion, observation count. For quick sources: change classification, observation category, outcome.
Step 2: Synthesise Observations
Gather the observations from the source resolved in Step 1, then hand them to the shared Retro Synthesis procedure (in the CPM Shared Skill Conventions). Source-gathering is this skill's responsibility; the grouping, synthesis, and retro-file format live in the shared procedure, so that cpm:do and cpm:retro produce identical retro files from the same inputs — there is one synthesis implementation, not two.
Gather the observations into the shared procedure's input shape — a list of per-story observations, each with a category and a one-sentence note:
For epic sources:
If **Retro**: fields exist, each field is one observation — its [category] is the category and the text is the note. The seven categories are: smooth deliveries, scope surprises, criteria gaps, complexity underestimates, codebase discoveries, testing gaps, patterns worth reusing.
If a ## Lessons section exists but no **Retro**: fields (e.g. fields were lost during editing, or an older cpm:do run synthesised them away), use the ## Lessons section as the observation source — it contains the same observations in pre-grouped form.
If both exist, use the **Retro**: fields as the primary observations (they are the raw input) and count each only once, even when it also appears in ## Lessons.
If neither exists, pass no observations — the shared procedure's status-only fallback produces a Batch Outcome summary from story statuses alone.
For quick sources: pass a single observation — the declared category and one-sentence note from the record's ## Retro section.
Then follow the shared Retro Synthesis procedure, passing the gathered observations, the source's story outcomes (story counts and any blocked/stuck stories identified in Step 1), and the source artefact path. The procedure groups by category, writes a brief synthesis per category (or the Batch Outcome fallback), and proceeds to the file write in Step 3.
Step 3: Write Retro File
Follow the shared Written Deliverable Length convention — let the document's length match what the task needs, without padding, redundant summaries, or boilerplate sections.
The shared Retro Synthesis procedure (invoked in Step 2) performs the write: it assigns {nn} via the shared Numbering procedure, derives {slug} from the source artefact name (e.g. epic doc 01-epic-auth.md produces retro slug auth), creates docs/retros/ if it doesn't exist, and writes the retro file to docs/retros/{nn}-retro-{slug}.md in the shared retro-file format.
Tell the user the retro file path after saving.
An artifact can be published from this output on request — follow the shared Artifact Publishing procedure. It is always separately confirmed, and never the default.
For retro the artifact is a trend view across retros: this retro's observations set against the ones before it, category by category, so a lesson recurring across several epics reads as a run rather than as one bullet in one file. That is the judgement no single retro document can carry — the pattern only exists in the sequence. As with companion assets, if you cannot write the one-line justification for what the visual carries that the prose cannot, it has not earned its place.
Step 3.5: Library Write-Back
After writing the retro file, check if any retro observations should be fed back into library documents. This step closes the loop: library → ... → retro → library.
Globdocs/library/*.md. If no files found or directory doesn't exist, skip this step silently and proceed to Step 4.
Read front-matter of each library document using the Read tool. Read each file individually with the Read tool directly (Bash loops with shell variables lose context). Filter to documents whose scope array includes do or all — these are the documents that guided task execution and are most likely to benefit from retro observations.
Match observations to library documents: For each retro observation (from the **Retro**: fields collected in Step 1), assess whether it's relevant to any library document. Use the observation category and content to match:
Codebase discoveries → likely relevant to architecture or coding standards docs
Complexity underestimates → may indicate missing constraints in architecture docs
Criteria gaps → may indicate missing rules in coding standards or business rules docs
Scope surprises → less commonly relevant to library docs, but flag if they reveal missing architectural context
Testing gaps → may indicate missing testing conventions in library docs or gaps in test infrastructure documentation
Propose amendments: For each matched observation, draft an amendment block:
## Amendment — {YYYY-MM-DD} (via retro)**Source**: {path to retro file just written}
**Category**: {observation category}
{Observation text — what was learned and what should change}
User approval gate: Present all proposed amendments to the user, grouped by target library document. Use AskUserQuestion:
Apply all amendments — Write all proposed amendments
Review individually — Walk through each amendment one at a time
Skip write-back — Leave all library documents unchanged
Write amendments: For each approved amendment, use the Edit tool to:
Append the ## Amendment block to the end of the library document
Update the last-reviewed date in the document's front-matter to today's date
Graceful degradation:
If no library directory exists, skip silently.
If no observations match any library documents, skip silently — only amend when there is a genuine match.
If no **Retro**: fields were captured (status-only retro), skip this step entirely.
The retro workflow always continues past write-back failures.
Step 4: Pipeline Handoff
After presenting the retro file path, offer the user options for what to do next.
Pivot suggestion check: Before presenting the handoff options, scan the synthesised observations for scope-affecting categories — criteria gaps, scope surprises, and codebase discoveries that imply the source spec or epic missed something material. If any such observation is present, surface a pivot offer alongside the regular handoff options.
Use AskUserQuestion:
Continue to /cpm:pivot(only when scope-affecting observations exist) — Use the retro to amend the source spec/epic. Pass the source artefact path (from the retro's **Source**: field) as $ARGUMENTS to /cpm:pivot.
Continue to /cpm:discover — Use the retro as starting context for problem discovery.
Continue to /cpm:spec — Use the retro as starting context for requirements specification.
Continue to /cpm:epics — Use the retro as starting context for work breakdown.
Just exit — End the session, no handoff.
If the user chooses a pipeline skill, pass the retro file path (or source artefact path for pivot) as the input context for that skill.
Delete the progress file after handoff or exit.
State Management
Follow the shared Progress File Management procedure, writing to docs/plans/.cpm-progress-{session_id}.md — or docs/plans/.cpm-progress.md when CPM_SESSION_ID is not in context. /cpm:clean, the Stale-Progress Check and compaction recovery all locate the file by globbing that exact stem, so one named anything else is invisible to every reader it exists for.
Lifecycle:
Create: before starting Step 1 (ensure docs/plans/ exists).
Update: after each step completes.
Delete: only after the final retro file has been saved and confirmed written.
/cpm:retro learn graduates a durable retro lesson — one that keeps proving true across runs — into the permanent reference library at docs/library/lessons-learned.md, then retires it at the source so it stops resurfacing in Retro Awareness while persisting durably for Library Check. Retros are transient feed-forward; a lesson that has earned its keep belongs in the library, not in the retro layer where it must be re-judged every run.
This flow is manual (a human chooses what to promote), mutually exclusive with synthesis (it never writes or reads a retro as a synthesis source), and runs only when $ARGUMENTS selects it (see Input). It proceeds in two steps: select a candidate lesson, then promote-and-retire it as one atomic operation.
Step L1: Gather and Select Candidates
Find the retros. Glob docs/retros/[0-9]*-retro-*.md. If none exist or the directory is absent, tell the user there are no lessons to promote and stop.
Collect candidate observations. Read each retro and gather its observations — the bullets under the category headings (Smooth Deliveries, Scope Surprises, Criteria Gaps, Complexity Underestimates, Codebase Discoveries, Testing Gaps, Patterns Worth Reusing). For each, retain its source retro path, its category, and the observation text.
Exclude already-retired lessons (offer-side idempotency). Skip any observation carrying a **Retired marker — per the shared Retro Retirement convention, a retired observation has already been dismissed or promoted, so it must never be offered as a candidate. This is what stops a promoted lesson being promoted twice.
Apply the optional scope hint. If $ARGUMENTS carried text after learn (a retro path or keyword), narrow the candidate set accordingly — a path restricts to that retro; a keyword filters to observations whose text or source matches. With no hint, offer all non-retired observations.
Present candidates, grouped. Show the candidates grouped by source retro and category, each line giving the observation text plus its source retro filename and category so the user can see provenance before choosing. Use AskUserQuestion (or a numbered list the user picks from) and support selecting more than one lesson in a single invocation. If no candidates remain after filtering, tell the user there is nothing to promote and stop.
Preview before any write. For each selected lesson, render a confirmation preview showing both halves of what Step L2 will do as one operation: (a) the proposed library entry — its title, the derived scope (computed via the auto-scope rules referenced in Step L2), the summary, and the provenance line; and (b) the retirement that will follow — the **Retired {YYYY-MM-DD}**: promoted to docs/library/lessons-learned.md marker that will be written back to the source observation. Confirm with the user. No file is written until this preview is confirmed — proceed to Step L2 only on confirmation.
Step L2: Promote and Retire (atomic)
For each lesson confirmed in Step L1, perform the promotion and retirement as one atomic operation. The two are inseparable — a lesson lives in exactly one place (see the Promotion is graduation guideline). Repeat the whole step per selected lesson when multiple were chosen.
Write the library entry:
Derive the entry's scope. Apply cpm:library's Auto-Scope Suggestion heuristics (in the cpm:library SKILL) to the lesson's content — do not reimplement them here. The retro category is a useful hint (e.g. a Testing Gaps lesson likely scopes to do), but the content drives the result.
Create or append to docs/library/lessons-learned.md.
First promotion (file absent): create it with a single file-level front-matter block conforming to cpm:library's Generate Front-Matter six-field model (title / source / added / last-reviewed / scope / summary) — again, follow that section rather than restating the rules. Use title: Promoted Retro Lessons; source: docs/retros/ (promoted via /cpm:retro learn); added and last-reviewed both today; scope the derived scope; a summary noting these are durable lessons promoted from retros.
Subsequent promotions (file present): append a new ## entry — never overwrite or rewrite existing content. Update the file-level front-matter in place: set scope to the union of the existing scope and the new entry's derived scope, and bump last-reviewed to today (added is unchanged).
Write the entry as a ## section with library-side provenance:
## {Lesson title}**Promoted**: {YYYY-MM-DD}
**Source**: docs/retros/{nn}-retro-{slug}.md → {Category} → "{verbatim observation text}"
**Scope**: {scope derived for this lesson}
{The lesson, written as durable standalone guidance.}
The **Source** line is the library→retro half of the provenance trail and the key used by the idempotency guard below.
Retire at the source (same operation):
Immediately after the library entry is written, retire the source observation in its retro per the shared Retro Retirement convention: append **Retired {YYYY-MM-DD}**: promoted to docs/library/lessons-learned.md to that observation's bullet, in place. This is the retro→library half of the provenance trail, and it is what makes the shared Retro Awareness selection skip the lesson from now on (so it lives only in the library).
Ordering rule — promotion is atomic, library-first. Write the library entry (steps 1–3) before the retirement marker (step 4). If the library write fails, do not write the retirement marker — never leave a lesson retired-but-not-promoted, and never report success on a half-done promotion. The pair succeeds together or not at all.
Idempotency (write side):
Before appending an entry, check docs/library/lessons-learned.md for an existing entry whose **Source** line matches the lesson being promoted. If one exists, the lesson is already promoted — no-op: do not write a duplicate entry and do not re-retire. Report it as already promoted. (Offer-side idempotency is handled earlier in Step L1, which never offers a **Retired-marked observation; this guard is the belt-and-braces for the rare case where the same lesson reaches L2 twice.)
Report each promoted lesson with both its library entry location and the retirement applied to its source retro.
Lesson Retirement (retire action)
/cpm:retro retire marks a spent retro lesson — one whose usefulness has permanently passed — with a durable **Retired** marker at its source, so it stops resurfacing in Retro Awareness while staying in place as a visible, reversible audit record. This is retirement's deliberate, out-of-cycle home: unlike cpm:do's in-cycle Obsolete retire (reserved for the rare can't-miss case mid-run), retire is the review pass you run when you sit down to prune the retro corpus.
It differs from learn only in terminus: learn retires a lesson because it graduated to the library; retire retires a lesson because it is spent. Both write the same **Retired** marker via the shared Retro Retirement convention; neither deletes the observation. This flow is manual (a human chooses what to retire), mutually exclusive with synthesis and learn, and runs only when $ARGUMENTS selects it (see Input). It proceeds in two steps: select candidates, then retire them.
Step R1: Gather and Select Candidates
Find the retros. Glob docs/retros/[0-9]*-retro-*.md. If none exist or the directory is absent, tell the user there are no lessons to retire and stop.
Collect candidate observations. Read each retro and gather its observations — the bullets under the category headings (Smooth Deliveries, Scope Surprises, Criteria Gaps, Complexity Underestimates, Codebase Discoveries, Testing Gaps, Patterns Worth Reusing). For each, retain its source retro path, its category, and the observation text.
Exclude already-retired lessons. Skip any observation carrying a **Retired marker — per the shared Retro Retirement convention, a retired observation has already been dismissed or promoted, so it must never be offered as a candidate.
Apply the optional scope hint. If $ARGUMENTS carried text after retire (a retro path or keyword), narrow the candidate set accordingly — a path restricts to that retro; a keyword filters to observations whose text or source matches. With no hint, offer all non-retired observations.
Present candidates, grouped. Show the candidates grouped by source retro and category, each line giving the observation text plus its source retro filename and category so the user can see provenance before choosing. Use AskUserQuestion (or a numbered list the user picks from) and support selecting more than one lesson in a single invocation. If no candidates remain after filtering, tell the user there is nothing to retire and stop.
Capture a reason and preview before any write. For each selected lesson, ask the user for a one-line reason the lesson is spent (what changed so it no longer holds), then render a confirmation preview showing the exact retirement that will follow: the **Retired {YYYY-MM-DD}**: {reason} marker appended to the source observation's bullet, named by source retro and category. Confirm with the user. No file is written until this preview is confirmed — proceed to Step R2 only on confirmation.
Step R2: Retire at the Source
For each lesson confirmed in Step R1, retire the source observation in its retro per the shared Retro Retirement convention: append **Retired {YYYY-MM-DD}**: {reason} to that observation's bullet, in place under its existing category heading, using the reason captured in Step R1. The bullet is not moved or deleted — retirement is reversible by removing the marker. This is what makes the shared Retro Awareness selection skip the lesson from now on.
Idempotency: if a selected observation already carries a **Retired marker, it is a no-op — do not append a second marker. (Step R1 already excludes retired observations from candidates; this is the belt-and-braces guard.)
Report each retired lesson with its source retro location and the marker applied.
Triage (triage action)
/cpm:retro triage sweeps the project's completed epics and, with confirmation, waives the ones that finished clean — epics with nothing worth reflecting on. A retro is not mandatory in CPM: cpm:do deliberately skips end-of-epic retro generation for a clean epic (no retro-trigger signal fired), yet the board and /cpm:status keep flagging every retro-less completed epic as "retro pending". Triage is how you clear that nag honestly — it records a durable epic-level **Retro waived**: marker that the board, /cpm:status, and the status-model contract treat as retro-satisfied.
This flow never synthesises, promotes, or retires — it only waives clean epics and reports the ones that still merit attention. It is mutually exclusive with the other modes and runs only when $ARGUMENTS selects it (see Input). It proceeds in two steps: scan and classify, then confirm and waive.
Step T1: Scan and Classify
Find completed epics. Glob docs/epics/[0-9]*-epic-*.md (exclude -coverage- files). If a scope hint was passed after triage, narrow to matching epics. Read each and consider only those whose epic-level **Status**: reads Complete/Done (by its leading token — see cpm/shared/status-model.md, Status parsing). Skip epics that are Pending / In Progress (not finished) and retired Superseded / Withdrawn epics (those never nag a retro anyway).
Classify each completed epic using only durable, persistent signals (the ephemeral cpm:do retro-trigger flags are gone once an epic finishes):
Already settled — skip silently: the epic already carries a **Retro waived**: marker, or a standalone docs/retros/ retro references it (its filename appears in a retro's text). Nothing to do.
Waivable (clean): no matching docs/retros/ retro and no substantive inline observations — i.e. it has zero story-level **Retro**: fields, or only [Smooth delivery]-category ones, and carries no **Inline change** breadcrumbs.
Has observations — report, don't waive: no retro yet, but the epic carries substantive inline **Retro**: observations (any category other than [Smooth delivery]). These hold real lessons; recommend /cpm:retro <epic> to synthesise them rather than waiving them away.
Present the findings. Show two lists: the waivable epics (each with the one-line reason it reads clean — e.g. "no retro, no observations" or "only Smooth-delivery notes"), and, separately and informationally, the has-observations epics as "consider /cpm:retro <epic>". If there are no waivable candidates, say so and stop (still surface the has-observations list if any).
Step T2: Confirm and Waive
Confirm before any write. Present the waivable candidates via AskUserQuestion (or a numbered list) and support per-epic opt-out — the user may waive all, some, or none. Never waive without confirmation; never waive a has-observations epic.
Write the marker. For each confirmed epic, use the Edit tool to insert a **Retro waived**: {YYYY-MM-DD} — clean epic, no lessons to synthesise line immediately after the epic-level **Status**: line (in the epic header block, before the first ## story). This is a distinct field from the story-level **Retro**: observations — do not confuse or merge the two.
Idempotency. If a **Retro waived**: marker already exists on the epic, it is a no-op — never write a second (Step T1 already skips settled epics; this is the belt-and-braces guard).
Report. List each epic waived (with the marker date) and, separately, restate the has-observations epics left for /cpm:retro. Waiving is reversible — deleting the marker line restores the nudge.
Guidelines
Signal over noise. A retro with 2 sharp observations is better than one with 10 vague ones. Synthesise into patterns, not just reformatted lists.
Actionable recommendations. Every recommendation should be something concrete that changes how the next cycle is planned or executed.
Works without observations. If no **Retro**: fields were captured, still produce a useful retro from story status — what completed, what didn't, what that implies.
Scannable. The entire retro file should be digestible in under a minute. Use bullet points and short paragraphs.
Promotion is graduation, not duplication.learn always retires what it promotes (Step L2) — a lesson lives in exactly one place: the retro layer until it proves durable, then the library. Never leave a promoted lesson active in both.
Retirement is deliberate and reversible.retire (and cpm:do's gated in-cycle Obsolete) only append a **Retired** marker — the observation stays in place and un-retires by deleting the marker. Retirement means the lesson is no longer true anywhere; it is never the right response to "this lesson doesn't apply to the work in front of me" — that is cpm:do's per-run Not relevant here, which leaves the source untouched. Prefer this deliberate retire pass over the in-cycle path for anything that isn't a can't-miss, just-superseded case.
