massgen

# MassGen Skill

Delegate tasks to your MassGen team.

## Before You Launch

Check that a config exists:

```bash
ls .massgen/config.yaml 2>/dev/null || ls ~/.config/massgen/config.yaml 2>/dev/null
```

If **no config exists**, set one up:
- **Default (browser)**: run `uv run massgen --web-quickstart` — user picks
  models and keys in the browser
- **Headless**: read `references/config_setup.md` — you discover available
  backends via `--list-backends`, check the user's API keys, discuss
  preferences, and generate config with `--quickstart --headless`

If config exists — launch immediately. No need to ask questions first.

## Important: Only Add What's Asked

Do NOT add extra flags unless the user explicitly requests them:
- No `--personas` unless the user asks for diverse approaches
- No `--plan-depth deep` unless the user wants detailed decomposition
- No `--quick` unless the user wants speed over quality

The defaults are good. Let MassGen handle the rest.

## Quick Dispatch

### 1. Detect Mode

| User Intent | CLI Flags |
|-------------|-----------|
| General task (write, build, research, design) | *(default)* |
| Review/critique existing work | `--checklist-criteria-preset evaluation` |
| Plan a feature or project | `--plan` |
| Plan and auto-execute | `--plan-and-execute` |
| Write requirements/spec | `--spec` |
| Execute an existing plan | `--execute-plan <path_or_latest>` |
| Execute against an existing spec | `--execute-spec <path_or_latest>` |

### 2. Write Criteria

**Always write opinionated evaluation criteria** tailored to the task. Criteria
shape what agents produce, not just how they're scored. Save to a temp file and
pass via `--eval-criteria`. Aim for 4-7 criteria.

**Required JSON format** — each criterion needs `text`, `category`, and `anti_patterns`:

```json
{
  "aspiration": "A site a designer would screenshot for their portfolio",
  "criteria": [
    {
      "text": "Design coherence: Does it feel authored or assembled? ...",
      "category": "primary",
      "anti_patterns": ["unmodified library defaults", "AI-generic aesthetics"]
    },
    {
      "text": "Content depth: Every section teaches something specific ...",
      "category": "standard",
      "anti_patterns": ["Wikipedia-summary prose", "filler sections"]
    }
  ]
}
```

Categories: `primary` (ONE — where the model needs most push), `standard`
(must-pass), `stretch` (nice-to-have). See `references/criteria_guide.md` for
full guidance on writing effective opinionated criteria.

For evaluate/plan/spec modes, you can use `--checklist-criteria-preset`
instead of writing custom criteria (presets: `evaluation`, `planning`, `spec`,
`persona`, `decomposition`, `prompt`, `analysis`).

### 3. Build Prompt

**General**: User's task with relevant context.

**Evaluate**: What to evaluate. Auto-gather git diff, changed files, test
output. Keep it factual — what was built, not your quality opinion. Let
agents discover issues independently.

**Plan**: Goal + constraints.

**Spec**: Problem statement + user needs + constraints.

### 4. Choose CWD Context

**Default to `rw` when the task produces files.** If the deliverable is a file
(code, docs, config, README, website, etc.), agents need write access. Use `ro`
only when agents need to *read* the codebase for context but their output is
pure text (an answer, review, or analysis) — not files.

| Scenario | Flag |
|----------|------|
| Task produces/modifies files in the project (code, docs, configs, etc.) | `--cwd-context rw` |
| Task needs codebase context but output is text only (review, analysis, Q&A) | `--cwd-context ro` |
| Isolated task, no codebase needed (default) | *(omit flag)* |

**Rule of thumb**: if the user says "write", "create", "build", "rewrite",
"update", or "edit" something in the project → `rw`.

### 5. Run

Always use the wrapper script:

```bash
# Isolated task (default, no cwd-context needed)
bash "$SKILL_DIR/scripts/massgen_run.sh" \
  --mode general \
  --criteria /tmp/massgen_criteria.json \
  "Create an SVG of a butterfly mixed with a panda"

# Task that writes to the project → rw
bash "$SKILL_DIR/scripts/massgen_run.sh" \
  --mode general --cwd-context rw \
  --criteria /tmp/massgen_criteria.json \
  "Rewrite the README with better examples and structure"
```

The wrapper includes `--web --no-browser` by default. The run starts
immediately — the user can open http://localhost:8000/ anytime to monitor
progress. **Tell the user about this URL.**

Run in the background. MassGen prints these for tracking:
- `LOG_DIR: <path>` — full run data
- `STATUS: <path>/status.json` — live status
- `ANSWER: <path>` — winning agent's answer.txt

Expect 15-45 minutes for multi-round runs.

### 5b. Review Notification (when `--cwd-context rw`)

When agents have write access (`--cwd-context rw`), automatically add
`--web-review` so the user can review git diffs before changes are applied.
Review requires `--web` (the wrapper's default).

**Headless (`--no-web`)**: If the user explicitly requests headless mode
with `--cwd-context rw`, skip `--web-review` — changes are applied directly
without a review gate. Warn the user that there will be no diff review.

After launching the MassGen run, **also launch the review watcher** in the
background. Parse `LOG_DIR` from the MassGen output first:

```bash
# Launch the watcher (reads LOG_DIR from the MassGen run output)
bash "$SKILL_DIR/scripts/review_watcher.sh" "$LOG_DIR"
```

The watcher polls `status.json` and prints structured markers when review
is ready:

```
__REVIEW_PENDING__
REVIEW_URL: http://localhost:8000/?v=2
REVIEW_API: http://localhost:8000/api/sessions/{id}/review-response
FILES_CHANGED: src/foo.py (M), src/bar.py (A)
__END_REVIEW_INFO__
```

When you see `__REVIEW_PENDING__`, tell the user:
> "MassGen has changes ready for review. You can open the WebUI to review
> diffs visually, or tell me which files to approve/reject."

**Two resolution paths:**

1. **Browser**: User opens the REVIEW_URL and app