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.
npx agentmods add skills/jotjunior/cstk/model-selectornpx skills add JotJunior/cstk --skill model-selectorgit clone --depth 1 https://github.com/JotJunior/cstkWrote 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.
[](https://agentmods.dev/skills/jotjunior/cstk/model-selector)<a href="https://agentmods.dev/skills/jotjunior/cstk/model-selector"><img src="https://agentmods.dev/badge/skills/jotjunior/cstk/model-selector.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00097 | $0.02463 |
| Opus 5 | $0.00048 | $0.01231 |
| Sonnet 5 | $0.00019 | $0.00493 |
| Haiku 4.5 | $0.00010 | $0.00246 |
Grade A, and why
model-selector 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.
How it starts
The opening of the file, as written. The whole thing — 196 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: Model Selector
Classifica uma tarefa proxima em faixa de complexidade (rasa | media |
profunda) com base em catalogo deterministico de sinais e sugere um
rotulo abstrato de modelo (haiku | sonnet | opus | manter-atual)
- score 0..2 + alternativa de fallback. Decisao final permanece do operador/orquestrador — a skill nunca troca modelo silenciosamente.
A skill e POSIX-pura (sem jq, sem bash-isms no caminho de
classificacao) e roda offline — zero coleta remota (Principio IV).
Quando usar
Use quando o orquestrador (agente-00c, feature-00c) ou operador humano quiser uma sugestao deterministica de qual modelo Claude rodar a proxima tarefa, baseada em sinais textuais (verbos, ferramentas) no input.
NAO use quando:
- O input nao e texto (binario, imagem, audio) — skill e text-only.
- A decisao precisa de contexto externo (precos correntes, modelo ativo no harness, billing API) — skill nao consulta estado externo.
- Voce quer troca AUTOMATICA de modelo — esta skill apenas SUGERE. Quem troca e o operador ou o orquestrador apos registrar Decisao.
Contrato I/O (resumo)
| Lado | Forma |
|---|---|
| Input | UMA string textual, 0..4096 chars, sem null-byte |
| Output sucesso | Markdown em stdout com 4 secoes fixas: ## Sugestao, ## Sinais detectados, ## Justificativa, ## Acao sugerida |
| Exit | 0 sucesso, 2 uso incorreto, 1 erro interno (catalogo ausente/invalido) |
Contrato completo (campos obrigatorios, invariantes testaveis, edge
cases): contracts/skill-io.md.
Exemplo minimo de output:
## Sugestao
**modelo**: haiku
**score**: 2
**alternativa**: sonnet
## Sinais detectados
- rode: rasa (peso=1)
- grep: rasa (peso=1)
## Justificativa
Verbos deterministicos (`rode`) + ferramenta POSIX (`grep`) indicam
operacao mecanica. Faixa rasa vence com 2 sinais.
## Acao sugerida (operador humano)
`/model haiku` (se operador quiser trocar; nao executado pela skill)
What ships with it
10 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.
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.
- 4d ago First seen · 196 lines · 97 tokens per session scan A 98c9a4a2ed80
model-selector is a skill published in the GitHub repository JotJunior/cstk (23 stars, last pushed today), licensed MIT. It adds 97 tokens to every session and 2,463 once invoked, about $0.0005 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.
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