owner

owner is a command for coding agents from vynazevedo/first-plan. It costs 29 tokens per session (587 once invoked), scanned A, original, MIT.

A command that uses Git history to show which people have contributed to a file or folder. Git is a tool that records changes to code over time.

In plain words
What is it for?
Use it to identify the main contributor, notable co-authors, recent activity, and the change history for a path.
Why use it?
It helps you find who knows a part of the codebase and see whether its ownership is concentrated or spread across contributors.

Command

Part of the fp plugin — 19 skills, 19 commands, 4 agents, 1 hook shipped together

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 commands/vynazevedo/first-plan/owner
Clone the repo
git clone --depth 1 https://github.com/vynazevedo/first-plan

Or install fp, the plugin that ships this one along with the rest of its 19 skills, 19 commands, 4 agents, 1 hook.

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 owner

README.md
[![agentmods](https://agentmods.dev/badge/commands/vynazevedo/first-plan/owner.svg)](https://agentmods.dev/commands/vynazevedo/first-plan/owner)
Your own site
<a href="https://agentmods.dev/commands/vynazevedo/first-plan/owner"><img src="https://agentmods.dev/badge/commands/vynazevedo/first-plan/owner.svg" alt="Measured on agentmods" height="20"></a>
Per session 29 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 587 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 $0.00029 $0.00587
Opus 5 $0.00015 $0.00293
Sonnet 5 $0.00006 $0.00117
Haiku 4.5 $0.00003 $0.00059

Measured 4d ago against content hash 0cfefed31bc2, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

owner 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 4d 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.

commands/owner.md · 82 lines

What it actually says

/fp:owner

Ownership inferido por path.

Argumentos

$ARGUMENTS - path de arquivo ou pasta.

Workflow

Passo 1 - Pre-flight

Verificar git repo + .first-plan/01-topology/ownership.md.

Passo 2 - Match

Procurar $ARGUMENTS em ownership.md:

  • Match exato de path
  • Match de prefixo (e.g., consultar internal/auth/jwt.go quando ownership.md lista internal/auth/)

Se nao encontrar match, rerun inline:

git shortlog -sne -- <path> | head -10

Passo 3 - Apresentar

Ownership de <path>

Top contributor: João Silva <[email protected]>
  - 47% das alterações (28 commits, 1234 linhas modificadas)
  - Última contribuição: ha 3 dias

Co-autores notáveis (>= 20%):
  - Maria Lima  - 31%  (18 commits)
  - Pedro Souza - 22%  (12 commits)

Outros contribuintes:
  - 5 pessoas com < 10% cada

Atividade temporal:
  - Última modificação: <data> (<X dias atrás>)
  - Modificações nos últimos 30 dias: <N>
  - Modificações nos últimos 90 dias: <M>

Implicações:
- Antes de mudança grande, considerar perguntar ao top contributor
- Alta dispersão = conhecimento difuso, possivelmente padrões inconsistentes
- Última modificação > 1 ano + contribuidor original inativo = candidato a dead code

Passo 4 - Casos especiais

Sem ownership claro (todos < 30%):

<path> não tem owner claro - 12 pessoas contribuíram, top com apenas 18%.

Implicação: padrões podem estar inconsistentes. Olhar commits recentes mais que histórico geral.

Path órfão (top contributor inativo):

<path> é potencialmente órfão.
Top contributor (João Silva) não fez commits há 8 meses.

Considerar:
- Validar se este código ainda é usado (via co-change graph: /fp:cochange <path>)
- Procurar outro mantenedor antes de mexer

Cuidados

  • Comparar com 01-topology/ownership.md em vez de sempre rodar git pode dar resultado mais rápido mas menos atualizado.
  • Se a camada está stale, oferecer refresh inline.
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. 4d ago First seen · 82 lines · 29 tokens per session scan A 0cfefed31bc2

Subscribe to this mod's changes

owner is a command published in the GitHub repository vynazevedo/first-plan (23 stars, last pushed 9d ago), licensed MIT. It adds 29 tokens to every session and 587 once invoked, about $0.0001 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.