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sailfin: Skill for Codex

.codex/skills/sailfin-pin-seed/SKILL.md

sailfin-pin-seed is a skill for Codex from SailfinIO/sailfin. It costs 23 tokens per session (401 once invoked), scanned A, original, GPL-2.0.

A release-pinning procedure for the Sailfin seed compiler, which is the compiler used to build or bootstrap the language itself.

In plain words
What is it for?
Pinning the Sailfin seed compiler to a release and verifying the seed binary.
Why use it?
It helps keep the compiler tied to a known published release and checks that the resulting seed program is valid.

Skill for Codex

Written for Codex: installed under .codex/.

This is SailfinIO/sailfin's own configuration. It tells Codex how to work on sailfin itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything sailfin configures →

not rated 8repo 2d ago A scan 23 tokens GPL-2.0
View source ↗ SailfinIO/sailfin sfn.dev
Reuse

Borrowing it

Nothing to install: this file belongs to SailfinIO/sailfin. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/SailfinIO/sailfin/main/.codex/skills/sailfin-pin-seed/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/SailfinIO/sailfin

Made for: 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 sailfin-pin-seed

README.md
[![agentmods](https://agentmods.dev/badge/skills/sailfinio/sailfin/sailfin-pin-seed/github.svg)](https://agentmods.dev/skills/sailfinio/sailfin/sailfin-pin-seed)
Your own site
<a href="https://agentmods.dev/skills/sailfinio/sailfin/sailfin-pin-seed"><img src="https://agentmods.dev/badge/skills/sailfinio/sailfin/sailfin-pin-seed/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 sailfin-pin-seed

Your own site · 80×15
<a href="https://agentmods.dev/skills/sailfinio/sailfin/sailfin-pin-seed"><img src="https://agentmods.dev/badge/skills/sailfinio/sailfin/sailfin-pin-seed.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 401 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.
Origin unknown 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 $0.00023 $0.00401
Opus 5.5 $0.00009 $0.00160
Sonnet 5.5 $0.00005 $0.00080
Haiku 4.5 $0.00002 $0.00040

Measured 1mo ago against content hash 327c22806b21, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sailfin-pin-seed 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 1mo 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.

.codex/skills/sailfin-pin-seed/SKILL.md · 31 lines

The source is not reproduced here

Licensed GPL-2.0

The repository is licensed GPL-2.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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. 1mo ago First seen · 31 lines · 23 tokens per session scan A 327c22806b21

Subscribe to this mod's changes

sailfin-pin-seed is a skill published in the GitHub repository SailfinIO/sailfin (8 stars, last pushed 2d ago), licensed GPL-2.0. It adds 23 tokens to every session and 401 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-10-02.

Languagescapability-based-securitycompile-time-safetycompilerconcurrencyprogramming-languageruntime
Related

sailfin-pin-seed compared with skills from other repositories

sailfin-pin-seed next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
sailfin-pin-seedSailfinIO/sailfinSkill82d agoGPL-2.0A23Codex
cicilisaman-pasha/ciciliSkill505d agoGPL-3.0A64Claude Code, Codex
swift-docspledgeandgrow/pledge-skillsSkill103mo agoMITA32Claude Code, Codex
migrate-oxfmtoxc-project/oxcSkill23ktodayMITA48Claude Code, Codex
vera-languageaallan/veraSkill420yesterdayMITA61Claude Code, Codex
module-newphel-lang/phel-langSkill5334d agoMITA13Claude Code
integration-fixturephel-lang/phel-langSkill5334d agoMITA10Claude Code