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/viniciuscarvalho/feature-marker/codexnpx skills add Viniciuscarvalho/Feature-marker --skill codexgit clone --depth 1 https://github.com/Viniciuscarvalho/Feature-markerWrote 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/viniciuscarvalho/feature-marker/codex)<a href="https://agentmods.dev/skills/viniciuscarvalho/feature-marker/codex"><img src="https://agentmods.dev/badge/skills/viniciuscarvalho/feature-marker/codex.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 | $0.00032 | $0.00305 |
| Opus 5 | $0.00016 | $0.00152 |
| Sonnet 5 | $0.00006 | $0.00061 |
| Haiku 4.5 | $0.00003 | $0.00030 |
Grade A, and why
feature-marker 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- feature-marker — 89% identical, 8 lines differ
What it actually says
feature-marker for Codex
Use this skill from inside Codex prompts:
Use feature-marker to implement billing-observability.
Run the complete flow by default:
- Create or reuse
tasks/{slug}/prd.md,tasks/{slug}/techspec.md, andtasks/{slug}/tasks.md. - Use the bundled templates in
templates/for PRD, TechSpec, and Tasks; fill{slug}and{feature_title}and leave no unresolved placeholders. - Create or require a feature branch before implementation.
- Use a git worktree only when the checkout is dirty or the user asks.
- Run an implementation grill pass before coding to find artifact, task, test, risk, and handoff gaps.
- Resolve grill findings in the artifacts, asking the user only when a finding changes scope or requires a product decision.
- Stop only for true ambiguity, unrelated dirty work, or blocked verification.
- Run verification, commit locally, and print exact push/PR handoff commands.
- Do not push, open a PR, create checkpoint JSON, or use an interactive menu.
spec-driven and ralph-loop are out of scope for this skill-first v1 unless
they are rebuilt as explicit skill instructions.
What ships with it
1 file 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 · 34 lines · 32 tokens per session scan A 1a4525a06f33
feature-marker is a skill published in the GitHub repository Viniciuscarvalho/Feature-marker (11 stars, last pushed 3mo ago), licensed MIT. It adds 32 tokens to every session and 305 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 2026-08-30.
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