compose-report

name	compose:report
description	Use after implementation is verified and before merge — consolidates multiple spec iterations into a single final-state report, marks related specs, and records key lessons

Writing Final Reports

Overview

Consolidate a feature's spec history into a single human-readable final report. The report presents the final implemented state as its primary content — what WAS BUILT, not what was tried. A brief Journey Log at the end captures notable failures and pivots for future designers.

Core principle: Final state first. The reader should understand the feature from this report alone, without reading any spec.

Announce at start: "I'm using the report skill to write the final report for this feature."

Save reports to: the reports/ directory given in the <compose_docs_dir> block of your prompt, as <feature-name>.md

• No date in filename — the report is overwritten in place when the feature evolves
• Git history tracks revisions
• User preferences for report location override this default

Update Semantics

Specs are accumulative (new file per iteration). Final reports are overwrite (same file updated in place):

• If a report already exists for this feature, read it first, then overwrite with updated content
• Append new Journey Log entries from this iteration (don't discard previous entries)
• Update the specs and plans lists to include any new entries

When to Use

Standard step after implementation is complete and verified — write a final report summarizing what was delivered.

Skip when:

• User explicitly asks to skip the report
• Change is trivially small (single bug fix, typo, config tweak) and not worth documenting

Checklist

1. Identify all related specs and plans — find every iteration of this feature's design in specs/ and plans/
2. Read the implemented code — understand what actually shipped (code is truth, not specs)
3. Draft main sections — What Was Built, Architecture, Usage, Verification (scale each section to complexity: a few sentences if straightforward, detailed for complex features, but never longer than the plan)
4. Draft Journey Log — brief flat bullet list, max 5 items
5. Assemble report — combine sections, add frontmatter, save to reports/
6. Self-review — verify report against code (not specs), check for placeholders, confirm length is proportional to feature complexity
7. Mark specs and plans — prepend NOTE header to each spec and plan file
8. Commit and transition — commit report + markers, invoke compose:merge

Report Document Structure

Every report MUST use this structure:

---
feature: <feature-name>
status: delivered
specs:
  - <spec-1-path>
  - <spec-2-path>
plans:
  - <plan-path>
branch: <branch-name>
commits: <first-sha>..<last-sha>
---

# [Feature Name] — Final Report

## What Was Built

[1-3 paragraph executive summary. What does the feature do? What problem
does it solve? Written for first contact — no "v1 tried X" narrative.]

## Architecture

[Final architecture as implemented. Components, boundaries, data flow,
key interfaces. Self-contained — reader needs no spec file.]

### Design Decisions

[Important choices and rationale. Frame as "we chose X because Y" —
never "we tried A, then B, then settled on X".]

## Usage

[How to use/configure/interact. Commands, config options, API surface.
Concrete examples.]

## Verification

[How the feature was verified. Test summary, manual testing, edge cases.]

## Journey Log

> Brief notes on what informed the final design. Not required reading.

- [dead end] Tried X — failed because Y
- [pivot] Switched from A to B after discovering C
- [lesson] Transferable insight here

## Source Materials

| File | Role | Notes |
|------|------|-------|
| `path/to/spec-1.md` | Initial design | See §3 for context on constraint X |
| `path/to/spec-2.md` | Revised after Y | Superseded by this report |
| `path/to/plan.md` | Implementation plan | Complete |

Marking Specs and Plans

For each file listed in specs and plans, insert this NOTE block between the document title (H1) and the rest of the content:

> [!NOTE]
> This document may not reflect the current implementation.
> See the final report for up-to-date state:
> [Final Report](../reports/<feature-name>.md)

Rules:

• Place between the H1 title and remaining content
• Do NOT move or delete files (git history and links preserved)
• Do NOT modify the body below the marker
• The marker is idempotent (can be re-applied safely)
• Use GitHub-compatible admonition syntax ([!NOTE], not [!CAUTION])

Writing Guidelines

Scale to complexity:

• Simple feature: each main section is 1-2 paragraphs
• Complex feature: detailed sections, but the report should never exceed the plan in length
• If it's getting longer than the plan, you're over-documenting

"What Was Built" section:

• Write as if this feature always existed in its current form
• No historical narrative, no "originally we planned..."
• A new team member should understand the feature from this section alone

"Architecture" section:

• Derive from CODE, not from specs (specs may have drifted)
• If code and spec disagree, document what the code does
• Include file paths, key types, data flow

"Design Decisions" section:

• Only include decisions that would surprise a reader or that have non-obvious rationale
• "We chose X because Y" format — NOT "we tried A, B, C and settled on X"
• If a decision's rationale is obvious from the code, skip it

"Journey Log":

• Flat bullet list, max 5 items total
• Each item prefixed with [dead end], [pivot], or [lesson]
• Each item is 1-2 sentences
• Only include items that would help a FUTURE designer avoid the same mistakes

Self-Review Checklist

After assembling the report, check:

1. Accuracy — Does the report match the code? (grep key function names, verify file paths exist)
2. Self-contained — Can a reader understand the feature without reading any spec?
3. No placeholders — No "TBD", "TODO", or "fill in later"
4. Length proportional — Not longer than the plan, not shorter than 1 paragraph per section
5. Journey Log brief — Max 5 items, each 1-2 sentences

Key Principles

• Final state first — Report describes "what is", not "what was tried"
• Self-contained — Reader needs only this report to understand the feature
• Code is truth — When specs and code diverge, document what code does
• Journey is secondary — Journey Log serves future designers, not understanding
• Non-destructive — Specs and plans get soft markers, never deleted or moved
• Machine-readable — Frontmatter specs/plans lists enable tooling
• Bidirectional — Report links to specs/plans, they link back to report

Integration

Preceded by: compose:verify (feature must be verified before documenting) Followed by: compose:merge (the terminal workflow step)

After saving the report and marking specs, offer transition:

"Final report written and committed to <path>. Related specs marked. Ready to finish the branch — invoking compose:merge."