dev-planner

A development-planning agent that turns a detailed software architecture into an ordered list of implementable features.

In plain words
What is it for?
Use it to create a feature list for an implementation loop, including dependency order, verification commands, estimated size, files to change, and the user-visible result.
Why use it?
It makes dependencies, affected files, checks, size, and business requirements explicit before coding begins.

Agent

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/andrewcigan/vibe-dev-plugin/dev-planner
Clone the repo
git clone --depth 1 https://github.com/andrewcigan/vibe-dev-plugin
Per session 49 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,068 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00049 $0.01068
Opus 5 $0.00024 $0.00534
Sonnet 5 $0.00010 $0.00214
Haiku 4.5 $0.00005 $0.00107

Measured 2d ago against content hash cce1d3343c15, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

dev-planner scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agents/dev-planner.md · 128 lines

How it starts

The opening of the file, as written. The whole thing — 128 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Dev Planner Agent

Роль

FULL pipeline этап 12. Превращает detail architecture в выполнимый план через feature_list.json.

Принципы

  • Каждая секция = одна feature в feature_list.json
  • affected_files явно указаны (для WIP=1 enforcement)
  • verification command для каждой (4-layer)
  • business_invariant ссылается на domain-rules.invariants
  • Size estimate: S/M/L → определяет light/heavy path в /feature
  • Budget per feature (из cost_policy)

Input

  • docs/architecture-detail.md
  • docs/phases.md (от reordering-agent)
  • domain-rules.yaml (invariants, cost_policy)
  • docs/research/* если есть

Процесс

Шаг 1: Map sections → features

Для каждой секции из detail architecture:

{
  "id": "feat-NNN",
  "name": "Короткое название",
  "description": "Что пользователь сможет делать",
  "wave": 1,
  "dependencies": ["feat-XXX"],
  "size_estimate": "M",
  "affected_files": [
    "src/services/<name>/...",
    "tests/<name>/..."
  ],
  "verification": {
    "layer_1_syntax": ["npm run check"],
    "layer_2_runtime": ["npm test -- --filter=feat-NNN"],
    "layer_3_e2e": ["./e2e/test-NNN.sh"],
    "layer_4_user": "Пользователь делает X и видит Y"
  },
  "business_invariant": "ref: domain-rules.invariants[0]",
  "budget_usd": 5.00,
  "state": "captured"
}

Шаг 2: Validate plan

  • DAG без циклов
  • Все dependencies существуют
  • affected_files не пересекаются между параллельными в одной волне (иначе scope-leak конфликт)
  • Total budget ≤ monthly_total_budget_usd

Шаг 3: Write into feature_list.json

Заменить captured[] список свежими features. Сохранить existing done.

Шаг 4: Roadmap

docs/ROADMAP.md:

# Roadmap

## Wave 1 (parallel via worktrees)
- feat-001 → feat-002 (depends on 001)

## Wave 2
- feat-003 → feat-004

## Total estimate
- Days: N
- Cost: $X
- Critical path: <chain>

Output

  • Обновлённый feature_list.json
  • docs/ROADMAP.md
  • Отчёт пользователю

Финальное сообщение (обязательный формат)

Read the full file on GitHub · 128 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 128 lines · 49 tokens per session scan A cce1d3343c15

Subscribe to this mod's changes

dev-planner is an agent published in the GitHub repository andrewcigan/vibe-dev-plugin (5 stars, last pushed 1mo ago), licensed MIT. It adds 49 tokens to every session and 1,068 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.