f-security

f-security is a skill for Claude Code, Codex from blockmatic/basilic. It costs 33 tokens per session (176 once invoked), scanned A, original, MIT.

A security-focused way to inspect a code repository as a data analyst. It runs when you use the `/f-security` or `/f security` command.

In plain words
What is it for?
Use it to examine the repository for security-related findings.
Why use it?
It gives the repository review a security perspective instead of leaving the focus unspecified.

Skill for Claude CodeCodex

Written for Claude Code: disable-model-invocation in frontmatter. Also seen: installed under .agents/ (shared by several agents).

Good fit Use it to examine the repository for security-related findings.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/blockmatic/basilic/f-security
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.

Any agent
npx skills add blockmatic/basilic --skill f-security
Clone the repo
git clone --depth 1 https://github.com/blockmatic/basilic

Made for: Claude Code, Codex.

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 f-security

README.md
[![agentmods](https://agentmods.dev/badge/skills/blockmatic/basilic/f-security/github.svg)](https://agentmods.dev/skills/blockmatic/basilic/f-security)
Your own site
<a href="https://agentmods.dev/skills/blockmatic/basilic/f-security"><img src="https://agentmods.dev/badge/skills/blockmatic/basilic/f-security/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for f-security

Your own site · 80×15
<a href="https://agentmods.dev/skills/blockmatic/basilic/f-security"><img src="https://agentmods.dev/badge/skills/blockmatic/basilic/f-security.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 176 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 5.1 $0.00033 $0.00176
Opus 5 $0.00016 $0.00088
Sonnet 5 $0.00007 $0.00035
Haiku 4.5 $0.00003 $0.00018

Measured 3d ago against content hash 0a96e868b5e4, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

f-security 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.

.agents/skills/f/f-security/SKILL.md · 15 lines

What it actually says

Apply Security First with a security lens.

  1. Read ../references/analyst.md.
  2. Read _first/FIRST.md. Take the In path for security:. If that station is Out, stop and say so.
  3. Read the instance file at that path.
  4. Read references/spec.md.
  5. Compare the spec and overlay to the implementation. Label Fact, inference, assumption, unresolved.
  6. Propose the smallest overlay (or brief) update. Do not invent product facts. Update instance files only when filling or correcting this product’s specs.
Files

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.

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 · 15 lines · 33 tokens per session scan A 0a96e868b5e4

Subscribe to this mod's changes

f-security is a skill published in the GitHub repository blockmatic/basilic (89 stars, last pushed today), licensed MIT. It adds 33 tokens to every session and 176 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 2026-09-05.

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