# Dag Slim

> Over-engineering-only review as a DAG: two passes, GLOBAL first (one strong reviewer hunts cross-file dedup/collapse/layer/couple — the -50% win), then LOCAL per-file hunks concurrently (delete/stdlib/native/yagni). One line per finding: what to cut, what replaces it. Trigger: what can we delete / over-engineered? / simplify review / 精简审查 / dag-slim. Skip: correctness/security bugs (/dag-review)…

- **Type:** Skill
- **Install:** `agentstack add skill-abysscn-oh-my-dag-dag-slim`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [AbyssCN](https://agentstack.voostack.com/s/abysscn)
- **Installs:** 0
- **Category:** [AI & ML](https://agentstack.voostack.com/c/ai-and-ml)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [AbyssCN](https://github.com/AbyssCN)
- **Source:** https://github.com/AbyssCN/oh-my-dag/tree/main/skills/dag-slim

## Install

```sh
agentstack add skill-abysscn-oh-my-dag-dag-slim
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# /dag-slim — over-engineering-only diff review

Finds what to DELETE, never what to fix. Every reviewer prompt carries the shared
`DESIGN_VOCAB` + `PONYTAIL_DISCIPLINE` blocks (`src/harness/review/design-vocab.ts`,
single source — same vocabulary as /dag-deepen, opposite direction). The best
outcome is fewer *concepts*, not just fewer lines.

## Usage

```bash
bun run scripts/dag-slim.ts \
  [--base main]         # diff base (default main)
  [--staged]            # review staged changes instead
  [--paths "a,b"]       # limit diff to pathspecs
  [--model M]           # local-pass leaf model  (env OMD_SLIM_MODEL > OMD_LEAF_MODEL)
  [--global-model M]    # global-pass model, stronger slot (env OMD_SLIM_GLOBAL_MODEL > OMD_REVIEW_FIND_MODEL)
  [--no-global|--no-local]  # run only one pass
  [--verify]            # reuse the dag-review refute layer over the findings
  [--out p]             # artifact path (default /tmp/omd-slim-.md)
```

Exit 2 on empty diff. Terse stdout: one line per finding, Global group first.

## Two passes — GLOBAL runs FIRST

Per-hunk golfing finds pennies; the system-level pass finds the -50%. Pass 1 is
ONE reviewer on a stronger model slot seeing the whole changed surface + what it
touches. Pass 2 splits the diff per file into a pre-built ConductorPlan (one
inproc leaf per file-chunk + a dedup synth node) and fans out concurrently.

| pass | kind | hunts | replacement |
|------|------|-------|-------------|
| global | `dedup:` | same logic hand-rolled in N places | one shared util (biggest win) |
| global | `collapse:` | parallel implementations of one concept | merge to one |
| global | `layer:` | module/indirection/wrapper nobody needs | deletion-test it, drop the layer |
| global | `couple:` | local-"minimal" choice that created coupling/duplication | the globally-coherent alternative |
| local | `delete:` | dead code, unused flexibility, speculative feature | nothing |
| local | `stdlib:` | hand-rolled thing Bun/std ships | name the function |
| local | `native:` | dep or app code doing what the platform does | name the feature |
| local | `yagni:` | abstraction with one impl, config nobody sets, layer with one caller | inline it |

Format: `:  — cut , replace with ` — one line per
finding, no prose. Nothing to cut → `Lean already. Ship.`

## Guardrails (from PONYTAIL_DISCIPLINE — violating these = false positive)

- A documented `DEFER`, a contract surface, a deliberate extension seam is
  **chosen architecture, not a finding** — planned ≠ speculative.
- Fewer lines, never fewer cases: a suggestion may not drop an edge case, type,
  validation, or error path — that is a bug, not a simplification.
- A single smoke test / assert self-check is the ponytail minimum, not bloat.
- `dedup:`/`collapse:` only merge things that are genuinely ONE concept — merging
  lookalikes manufactures coupling.
- Findings ≠ ground truth: the caller adjudicates (same discipline as /dag-review).

## The `ponytail:` marker + omd-debt

Deliberate shortcuts are marked in code as `// ponytail: , `
(`#` and `/*` prefixes too). Those markers are NOT dag-slim findings — they are
tracked debt. Harvest the ledger with:

```bash
bun run scripts/omd-debt.ts [--paths "src,scripts"]   # pure scan, zero LLM; exit 3 = clean
```

One row per marker: `: — . ceiling: . upgrade: `
(missing trigger → `-` = rot risk).

---
Family: `/ponytail` (behavioral lazy mode) · `omd-debt` (shortcut ledger).
Correctness/security → /dag-review; what to DEEPEN → /dag-deepen.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [AbyssCN](https://github.com/AbyssCN)
- **Source:** [AbyssCN/oh-my-dag](https://github.com/AbyssCN/oh-my-dag)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-abysscn-oh-my-dag-dag-slim
- Seller: https://agentstack.voostack.com/s/abysscn
- Browse the marketplace: https://agentstack.voostack.com/browse

---
Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.