agentmods.dev

plan

plan is a skill for Claude Code, Codex from JotJunior/cstk. It costs 115 tokens per session (4,270 once invoked), scanned A, original, MIT.

A technical implementation-planning workflow that turns an existing feature specification into an engineering design.

In plain words
What is it for?
Use it when a project already has the required spec and needs a technical plan that can lead to checklists, tasks, or consistency analysis.
Why use it?
It makes the build approach explicit by covering architecture, data models, interfaces, research, and test scenarios before implementation.

Skill for Claude CodeCodex

Part of the cstk plugin — 21 skills, 7 commands, 7 agents shipped together

not rated 22 4d ago A scan 115 tokens original MIT
View the source file JotJunior/cstk
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 skills/jotjunior/cstk/plan
Any agent
npx skills add JotJunior/cstk --skill plan
Clone the repo
git clone --depth 1 https://github.com/JotJunior/cstk

Made for: Claude Code, Codex.

Or install cstk, the plugin that ships this one along with the rest of its 21 skills, 7 commands, 7 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/jotjunior/cstk/plan.svg)](https://agentmods.dev/skills/jotjunior/cstk/plan)
Your own site
<a href="https://agentmods.dev/skills/jotjunior/cstk/plan"><img src="https://agentmods.dev/badge/skills/jotjunior/cstk/plan.svg" alt="Measured on agentmods" height="20"></a>
Per session 115 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,270 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 $0.00115 $0.04270
Opus 5 $0.00057 $0.02135
Sonnet 5 $0.00023 $0.00854
Haiku 4.5 $0.00012 $0.00427

Measured 3d ago against content hash 99d2b69d4963, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

plan 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 3d 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.

plugins/cstk/skills/plan/SKILL.md · 432 lines

How it starts

The opening of the file, as written. The whole thing — 432 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill: Plano de Implementacao Tecnico

Gere um plano de implementacao completo a partir de uma feature spec, cobrindo arquitetura, decisoes tecnicas, modelo de dados e contratos.

Pre-requisitos

Obrigatorio: docs/specs/{feature}/spec.md ja existente. Sem spec, abortar.

Recomendado:

  • /clarify executado (reduz NEEDS CLARIFICATION na Etapa 3)
  • docs/constitution.md existente (usado como gate — violacoes sao bloqueantes)

Proximos passos

  1. /checklist — gerar quality gate antes de implementar
  2. /create-tasks — decompor o plano em backlog executavel
  3. /analyze — apos ter tasks, validar consistencia cross-artifact

Argumentos

$ARGUMENTS

Leitura de artefatos foundational (briefing + constitution)

Antes de ler docs/briefing.md (ou o legado docs/01-briefing-discovery/briefing.md) ou docs/constitution.md direto do disco, verifique se ha cache valido populado pelo agente-00c ou feature-00c. Aditivo — se nao houver cache, leia direto do disco conforme comportamento padrao (FR-CACHE-014).

  1. Detectar agente ativo: variavel AGENTE_00C_STATE_DIR setada, OU <projeto-alvo>/.claude/agente-00c-state/state.json existente, OU <projeto-alvo>/.claude/feature-00c-state/<short>/state.json.

  2. Se ativo, tente consumir o resumo via Bash:

    ~/.claude/skills/agente-00c-runtime/scripts/state-cache.sh get-resumo \
  --state-dir "$SD" --artifact briefing
    • Exit 0 + stdout nao-vazio: use o resumo como conteudo.
    • Exit 1: cache miss (campo ausente, estrategia=passthrough, drift detectado) — caia em leitura direta.
    • Exit 2: erro fatal (state.json corrompido) — aborte com diagnostico do stderr.

    Mesmo protocolo para --artifact constitution. NOTA: esta skill tem dependencia HARD em docs/constitution.md (gate de violacoes na ETAPA 2). Se cache miss + arquivo source ausente em disco, isso eh erro de pre-requisito, nao falha do cache.

  3. Apos consumo (hit ou miss), registre metrica via:

    ~/.claude/skills/agente-00c-runtime/scripts/state-cache.sh metrics-bump \
  --state-dir "$SD" --tipo <hit|miss-drift|miss-disabled> \
  [--chars-economizados N]

    onde N = source_chars - resumo_chars quando hit, ou 0 caso contrario.

Read the full file on GitHub · 432 lines

Files

What ships with it

6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 3d ago First seen · 432 lines · 115 tokens per session scan A 99d2b69d4963

Subscribe to this mod's changes

plan is a skill published in the GitHub repository JotJunior/cstk (22 stars, last pushed 4d ago), licensed MIT. It adds 115 tokens to every session and 4,270 once invoked, about $0.0006 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 2026-08-30.

Planning
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