Timeline

Respond in the user's preferred language (detect from their recent messages, or fall back to the language setting in CLAUDE.md).

Group the current branch's commit history into semantic phases along a timeline, and generate two review documents: architecture evolution + code review.

Arguments: $ARGUMENTS

• No arguments: diff against main...HEAD
• --base <branch>: specify a custom base branch for comparison

Core Concept

Unlike /qq:brief (produces architecture diff + PR checklist), this command groups commits by timeline phases, helping reviewers build a mental model in development order while preserving priority annotations.

Execution Steps

1. Collect Commit History

git log <base>..HEAD --oneline --reverse --format="%h %ai %s"

2. Group Commits into Semantic Phases

Grouping criteria (in order of priority):

1. Semantic affinity: consecutive commits on the same feature/subsystem go in the same group
2. Natural breakpoints: merge commits, date gaps > 1 day, module switches
3. Phase markers in commit messages: if a commit self-annotates with a Phase, respect that first

Each Phase requires:

• A semantic name (e.g. "Player Health System", not "Phase 1")
• Date range
• List of commits (hash + one-line description)
• One-sentence summary

Target: 5–10 Phases (too few loses timeline value; too many becomes per-commit annotation)

3. Analyze Changes per Phase

For each Phase:

git diff <phase_first_commit>~1..<phase_last_commit> --stat
git diff <phase_first_commit>~1..<phase_last_commit> -- '*.cs'

Read the full content of key changed files to understand context — not just diff fragments.

4. Generate Document A: Architecture Evolution Timeline

Format:

# Architecture Evolution Timeline

> X phases, Y commits, Z-day development span
> Branch: `<branch>`, base: `<base>`

---

## Phase 1: <Semantic Name> (<date range>, N commits)

> One-sentence summary

<details>
<summary>Commits</summary>

- `hash1` message1
- `hash2` message2
</details>

### Architecture Changes

#### [Tier 1] Change Title (if any)
**Scope**: ...
**Nature of change**: ...

\```mermaid
<diagram: show the architectural changes introduced in this phase, not the accumulated final state>
\```

#### [Tier 2] Change Title (if any)
...

### Dependencies Introduced This Phase
- `ModuleA` → `ModuleB` (new reference)

### Cumulative State
> Overall progress to this point: X completed, next phase will Y

---

## Phase 2: <Semantic Name> ...

Diagram requirements:

• Each diagram shows the incremental changes in this phase, not the accumulated final state up to this point
• Use green to highlight parts newly added in this phase, gray for existing context
• If this phase modifies a structure introduced in a previous phase, use orange to highlight it

5. Generate Document B: Code Review Timeline

Format:

# Code Review Timeline

> X phases, Y commits
> Branch: `<branch>`, base: `<base>`

## Review Priority Quick Reference

| Phase | P0 | P1 | P2 | Files | Est. Time | Core Risk |
|-------|----|----|----|-------|-----------|-----------|
| 1. Name | 0 | 2 | 1 | 5 | 10 min | No major risk |
| 2. Name | 3 | 1 | 0 | 12 | 25 min | Global static state isolation |
| ... | | | | | | |

Time estimation rules:
- Each P0 item ~5 min (requires reading context + verification)
- Each P1 item ~2 min (quick check)
- Each P2 item ~0.5 min (quick scan)
- Round up to the nearest 5 minutes

**Recommended review order**: sort by P0 count descending — review the highest-risk phases when most focused

---

## Phase 1: <Semantic Name> (<date range>, N commits)

> One-sentence summary

<details>
<summary>Commits</summary>

- `hash1` message1
- `hash2` message2
</details>

### Files to Review

List C# files involved in this phase by priority (exclude pure asset/config/test files), annotated with the highest priority level:

| File | Priority | Change Summary |
|------|----------|---------------|
| `Assets/Scripts/.../GameManager.cs` | P0 | Core game loop changes |
| `Assets/Scripts/.../PlayerController.cs` | P0 | Input handling refactor |
| `Assets/Scripts/.../InventorySystem.cs` | P1 | Data model migration |
| ... | P2 | ... |

File list generation rules:
- Obtain from `git diff <phase_start>..<phase_end> --name-only -- '*.cs'`
- Exclude test files under `Tests/` (unless the tests themselves have P0/P1 review items)
- Exclude pure Editor tool files (unless they have review items)
- Each file is annotated with its highest priority level from this Phase's review items
- Files with no review items are annotated `--` (no separate review needed)
- Sort by priority: P0 first, `--` last

### P0 — Must be human-reviewed
1. **Filename:line** — change description
   Risk: why this needs attention
   Suggestion: what to focus on during review

### P1 — Recommended attention
2. **Filename:line** — change description
   Suggestion: checkpoints

### P2 — Quick scan
3. **Filename:line** — description

---

## Phase 2: ...

P0/P1/P2 Assessment Criteria (consistent with /qq:brief):

• P0: Public interface changes, new cross-module dependencies, data format changes, state management/lifecycle changes, global static state isolation, anti-patterns (FindObjectOfType, etc.), resource cleanup/event unsubscription
• P1: Business logic branches, performance-sensitive paths (Update/FixedUpdate), O(N²) patterns, error handling/edge cases, new public methods or classes
• P2: Pure getters/setters/logging/comments, test code, config value tweaks

Key rule: Each review item appears only in the phase that introduced it — do not repeat it in later phases. If a later phase modifies code from an earlier phase, annotate it in that later phase as "modifies Phase X's ...".

6. Generate Document C: Review Guide

Generate REVIEW_GUIDE.md (no timestamp, overwrite each time), with content dynamically populated based on documents already present in the current directory.

Format:

# Review Guide

> Branch: `<branch>`
> Generated: `<timestamp>`

## Document Index

| Document | Perspective | Purpose |
|----------|-------------|---------|
| `timeline-arch_<ts>.md` | Timeline × Architecture | Understand how the architecture evolved in development order |
| `timeline-review_<ts>.md` | Timeline × Review | Review code phase by phase, each with a file list |
| `arch-review_<ts>.md` | Final state × Architecture | Final architecture overview + module heatmap (if exists) |
| `pr-review_<ts>.md` | Final state × Review | Full final P0/P1/P2 list (if exists) |

If a document does not exist, annotate in the table "Not generated — run `/qq:brief` to generate".

## Reading Order

### Scenario A: First time looking at this branch

Use when: just picked it up, cross-team review, or returning after a long break

1. **timeline-arch** — follow the timeline to understand "how it got to this state", build a mental model
2. **arch-review** — view the final architecture overview and confirm the model is complete
3. **timeline-review** — review code phase by phase (use the quick reference to pick high-risk phases first)
4. **pr-review** — final scan from the final-state perspective to catch systemic risks across phases

### Scenario B: Already familiar with the branch, reviewing code directly

Use when: self-reviewing your own code, routine incremental review

1. **timeline-review** — quick reference → pick phases with most P0s → file list → review each item
2. **pr-review** — catch what was missed: the final-state perspective may reveal cross-phase combination risks

> Skip the two arch documents in Scenario B — you already know the architecture.

## Self-Review Workflow

Run /qq:timeline ↓ Open timeline-review, check the quick reference table ↓ Select phases in descending P0 count order (review highest-risk phases when most focused) ↓ For each Phase:

1. Open the "Files to Review" table → open all P0 files
2. Go through P0 items one by one → verify against the code
3. Quickly scan P1 → only check items marked "Suggestion"
4. Skip P2 (unless there's a question)
5. Found an issue → fix it → commit ↓ All phases reviewed ↓ Run /unity-compile + /qq:test to verify ↓ Optional: run /qq:brief to generate final-state docs for last-pass coverage ↓ Merge

## Time Budget

Summarize from the `timeline-review` quick reference table:

| Phase | Estimated Time |
|-------|---------------|
| (copied from quick reference) | |
| **Total** | **X min** |

7. Output

Write three files to Docs/qq/<branch-name>/:

• timeline-arch_<timestamp>.md
• timeline-review_<timestamp>.md
• REVIEW_GUIDE.md (no timestamp, overwritten each time)

Branch name rule: use the current branch name, replacing / with _. Timestamp format: YYYY-MM-DD-HHmm.

Notes

• Phase grouping is the most critical judgment in this command — poor grouping makes the entire document useless. Take extra time to group well rather than rushing to write content
• The two documents must have completely identical Phase numbers and names for easy cross-reference
• Architecture diagrams show increments, not the accumulated state — reviewers should be able to see "what was added in this phase"
• If a Phase has no architecture changes (pure bug fix/UI), briefly note it in the arch document — no need to force a diagram
• If a Phase has no points worth reviewing, note "No additional review needed for this phase" in the review document
• Each Phase's analysis should be based on the actual diff for that phase, not speculation
• For large Phases (>15 commits), you may further split into sub-phases