cy-capture-decisions

name	cy-capture-decisions
description	Reconciles a finished workflow's planned decisions (its Accepted ADRs) against the settled reality (git diff, review issues, and task status), then promotes the proven, cross-feature-durable ones into a durable project decision log at .compozy/DECISIONS.md plus .compozy/decisions/AD-NNN.md. Use when a workflow has finished its full pipeline (review round, reviews fix, and final verify) and you want to capture its durable decisions as the final step, or when re-running capture to refresh the log after further changes. Do not use for capturing decisions mid-implementation before review remediation, for PRD or TechSpec authoring, for PR review remediation, or for generic note-taking.
argument-hint	["slug"]

Capture Decisions

Reconcile a finished workflow's plan (its Accepted ADRs) against the settled reality (the code diff, review issues, and task status), then promote the proven, cross-feature-durable decisions into a durable, project-scoped decision log. Run this manually, as the final step of the pipeline — after /cy-review-round, compozy reviews fix, and /cy-final-verify — so capture sees the remediated, verified state rather than a mid-flight guess.

The log is two tiers: a terse index (.compozy/DECISIONS.md) that is @imported into agent memory, and rich per-decision bodies (.compozy/decisions/AD-NNN.md) read on demand. Both live at the workspace root, not under .compozy/tasks/<slug>/, so they survive compozy archive.

The <slug> argument names the source workflow to reconcile from. The skill is idempotent: re-running on an unchanged workflow is a no-op.

Required Inputs

• <slug>: the workflow slug identifying the source .compozy/tasks/<slug>/ directory to reconcile.
• Optional: nothing else. The skill discovers every input from the workspace.

Read the three references before writing anything:

• references/reconciliation-guide.md — the relevance gate, evidence rules, classification, provenance, supersession, degraded mode, and fresh-eyes discipline. This is the procedural core.
• references/decision-record-template.md — the exact AD-NNN.md frontmatter schema, body sections, Reconciliation section, and filename pattern.
• references/index-format.md — the exact DECISIONS.md line grammar and membership rule.

Examples

Promotion (happy path)

Invoking /cy-capture-decisions feat-orders on a finished, verified workflow whose plan had one cross-feature-durable ADR (adrs/adr-002.md, event-sourcing) and two feature-local ADRs writes .compozy/decisions/AD-001.md and adds one line to .compozy/DECISIONS.md:

AD-001 | Event-sourcing for orders | proven | [orders, async] | audit + replay | feat-orders

and prints a run summary:

Captured from feat-orders:
  PROMOTED  AD-001  NEW  Event-sourcing for orders (proven; evidence: verify p99<200ms; diff abc123)
  SKIPPED   adr-001      feature-local table naming (obvious from schema)
  SKIPPED   adr-003      pagination default (not cross-feature-durable)

Re-running the same command with no further changes prints no changes and writes nothing.

Degraded mode (diff unscopable)

When the diff cannot be scoped (unknown base, broken range, detached history), capture degrades: it reconciles from memory/MEMORY.md + review issues instead, writes each affected decision as candidate (never proven), and marks its Reconciliation section "unverified against code". A candidate is excluded from the index, so .compozy/DECISIONS.md stays empty here and the summary reports the scoping failure:

Captured from feat-orders (DEGRADED: diff unscopable — detached HEAD):
  CANDIDATE  AD-001  NEW  Event-sourcing for orders (unverified against code — diff unscopable)
  SKIPPED    adr-001      feature-local table naming (obvious from schema)

A later re-run once the diff is scopable promotes the same AD-001 to proven in place — no new id.

Workflow

1. Resolve inputs and confirm the final-step position.

   • Reject a missing or malformed <slug> argument. Do not guess a target.
   • Derive the source directory .compozy/tasks/<slug>/. If it does not exist, report "slug not found"; if only an archived variant exists, report "already archived" and write nothing.
   • Confirm this is being run as the final pipeline step (after /cy-review-round, compozy reviews fix, /cy-final-verify). If review artifacts are absent, note it and continue — capture still runs on diff + verify signal (see step 3 and references/reconciliation-guide.md).
   • Resolve the durable log paths at the workspace root: .compozy/DECISIONS.md (index) and .compozy/decisions/ (bodies). Never write the log under .compozy/tasks/<slug>/.

2. Read the existing log.

   • Read .compozy/DECISIONS.md if it exists and list .compozy/decisions/AD-*.md.
   • Build an in-memory map of already-promoted decisions keyed by source_slug + source_adr provenance (the idempotent re-match key), plus their title/status for the semantic fallback.
   • If the log does not exist yet, treat it as empty; the first NEW decision becomes AD-001.

3. Gather reconciliation evidence, in priority order.

   • Ground truth (primary): the code diff for the slug — git diff main...HEAD (the scoping convention from cy-review-round) — plus fresh-eyes review issues (.compozy/tasks/<slug>/reviews-NNN/issue_*.md) and the verify proxy (task files' status: completed, set only after a clean /cy-final-verify).
   • Plan: the workflow's Accepted ADRs (.compozy/tasks/<slug>/adrs/adr-*.md). These are the candidate decisions to reconcile.
   • Hint (secondary, unverified self-report): .compozy/tasks/<slug>/memory/MEMORY.md — used only to locate candidate decisions, never as proof.
   • If the diff cannot be scoped (unknown base, broken range, detached history), switch to degraded mode: fall back to memory + review issues, and mark every entry "unverified against code" so it is written as candidate, not proven (see references/reconciliation-guide.md). Do not fabricate evidence; if neither diff nor reviews are available, promote nothing.

4. Apply the relevance gate to each plan ADR.

   • Read the gate in references/reconciliation-guide.md. Promote an ADR only if it passes all three: cross-feature-durable AND non-obvious AND future-relevant. When in doubt, do not promote — a missed decision can be captured on a later re-run; a wrongly-promoted one is permanent noise.
   • Record each skipped ADR with its gate reason for the run summary. Skipped ADRs stay workflow-local.

5. Classify each surviving decision against the existing log.

   • Match by source_adr provenance first (exact), then LLM semantic fallback (robust to ADR renumbering). Assign one classification (see references/reconciliation-guide.md):
     • NEW — no match in the log → assign the next AD-NNN (step 7), write body + index line.
     • UPDATE — already promoted (provenance or strong semantic match) → amend the existing body in place (status, new evidence); no new number.
     • SUPERSEDE — conflicts with / reverses an active decision from another slug → create a new record and mark the old one superseded (step 6).
   • A weak-only semantic match with no source_adr match is NEW with a low-confidence note, never an incorrect UPDATE.
   • If provenance matches and nothing changed, this decision is a no-op (idempotency).

6. Reconcile each decision against reality and write its record.

   • Read references/decision-record-template.md for the exact frontmatter schema and body layout.
   • Set status: proven only when a cited diff/review/verify evidence backs the decision; otherwise status: candidate with the missing-evidence reason. Populate evidence with the concrete citations (verify result, diff ref, resolved issue_NNN).
   • Preserve the original ADR body sections (Context / Decision / Alternatives / Consequences) and add a ## Reconciliation section describing what execution proved vs. planned. When the shipped result diverged from the plan, mark it with a [DEVIATION] marker and cite the evidence; when it matched, state "implemented as designed" with no [DEVIATION].
   • SUPERSEDE handling — never rewrite an accepted decision in place to reverse it. Instead: set the old record's superseded_by: AD-NNN (it drops from the index but keeps its file), and set the new record's supersedes: [AD-OOO]. Keep the links bidirectional. In a chain A→B→C, only the tail (C) is active.
   • Tag every promoted record with tags: [area, domain] in frontmatter.

7. Assign numbers deterministically (shell, not LLM).

   • Process NEW/SUPERSEDE records one at a time: compute the id, write its body, then recompute for the next record. The derivation below reads on-disk state, so an id is only reserved once its file exists — never batch-assign ids before writing (two records computed against the same directory snapshot resolve to the same AD-NNN and collide).

   • For each NEW/SUPERSEDE record, compute the next id from the maximum existing suffix — not the file count, which reuses an id whenever the numbering has a gap (AD-001, AD-003, AD-004 counts 3 and would reselect the existing AD-004, overwriting a real decision body). A gap can arise from a manual repair, an import, or an interrupted prior capture (US-006.EC-2). Derive from the max instead:

     max=$(ls .compozy/decisions/AD-*.md 2>/dev/null | sed -E 's#.*/AD-0*([0-9]+)\.md#\1#' \
       | sort -n | tail -1); printf 'AD-%03d\n' "$((${max:-0} + 1))"
     

   • Deriving from the max keeps ids unique even across a gap — the example above yields AD-005, never a reused AD-004, honoring the "unique across the whole log. Never reused" contract in references/decision-record-template.md. Because each body is written before the next id is computed, two NEW decisions in one run still take consecutive ids with no collision. UPDATE records keep their existing id.

   • Write each body to .compozy/decisions/AD-NNN.md (zero-padded 3 digits). Create .compozy/decisions/ if missing.

8. Update the terse index.

   • Read references/index-format.md for the exact grammar. Write one line per active, proven decision to .compozy/DECISIONS.md:

     AD-NNN | Title | status | [tag, tag] | one-line rationale | source_slug
     

   • Exclude every candidate and every superseded record — they exist in their AD-NNN.md files but never appear in the index. On an empty result, write the documented empty-state index, not an empty file with a dangling reference.

9. Print the run summary.

   • List: decisions promoted (each with NEW / UPDATE / SUPERSEDE and its AD-NNN), decisions skipped by the relevance gate (with reason), and any written as candidate (with the missing-evidence reason).
   • On an unchanged re-run, state "no changes" explicitly.

10. Verify before completion.

    • Use the installed cy-final-verify skill before claiming capture is complete.
    • Re-read the written bodies and index; confirm frontmatter parses, status is a valid enum value, the index contains only active-proven lines, and every supersession link is bidirectional.
    • Confirm a second run on the now-unchanged workflow would be a no-op (provenance match).

Critical Rules

• Never rewrite an accepted decision in place to change its meaning — supersede it. Amending in place is only for UPDATE (same decision, new status/evidence). Reversal or conflict is SUPERSEDE.
• The index carries active-proven records only. candidate and superseded records live in their files but are excluded from DECISIONS.md (ADR-003).
• Filenames and index lines must match the grammar in references/decision-record-template.md and references/index-format.md exactly — a validator (task_02) parses them.
• | is the index's reserved delimiter. A decision title and its index rationale must not contain a literal | — render any pipe as /. The index Title is a verbatim copy of the body title (the validator enforces equality), so keeping both pipe-free keeps them consistent (references/index-format.md).
• Write the log at the workspace root (.compozy/DECISIONS.md, .compozy/decisions/AD-NNN.md), never under .compozy/tasks/<slug>/ (ADR-002).
• Cite evidence for every proven record. A decision without cited diff/review/verify evidence is candidate, not proven.
• Be idempotent. A provenance match with no change is a no-op; do not re-add or renumber.
• Run capture serially. Only one capture may write a workspace's decision log at a time. Concurrent captures on the same workspace are unsupported; finish or recover one run before starting another.
• Do not fabricate evidence or promote everything. Prefer not promoting when the relevance gate is unsure (ADR-008).
• Do not silently edit the user's .gitignore or CLAUDE.md / AGENTS.md. Consumption wiring and gitignore negations are documented (task_03 README), not applied by this skill.

Error Handling

• Missing/malformed <slug> → reject and stop; do not guess a target or write anything.
• Slug directory not found / already archived → report the specific condition; write nothing.
• No Accepted ADRs, or all are feature-local → no-op: zero promotions with reasons, and do not create empty log files (on a fresh project still emit the documented empty-state index only if the log is being created).
• One source ADR malformed/unreadable → skip that decision with a warning and continue processing the others.
• Unscopable diff → degrade to memory + reviews, mark entries "unverified against code" as candidate (never overclaim proven). A broken commit range is reported, not crashed.
• Unwritable .compozy/ → fail the write step without partial or truncated files; leave any pre-existing log unchanged.
• Interrupted mid-write / a second run → re-running reconciles via provenance to a consistent log (no duplicate or half-written AD). Capture is a single, final, serial step; concurrent runs on one workspace are unsupported.
• Pre-existing local edit to the log → surface it as a normal VCS diff/merge; never silently overwrite a user's manual correction — reconcile to the corrected state via provenance.