A planning workflow for organizing Sailfin compiler and runtime work in Linear. Linear is a tool for tracking issues, projects, priorities, cycles, and estimates.

Use it to audit or create initiatives, projects, cycles, priorities, estimates, and issue states in Linear.

It turns broad compiler goals into smaller, session-sized issues and helps keep production health and performance work ordered.

How SailfinIO/sailfin configures Codex

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/sfn-plan/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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/sailfinio/sailfin/sfn-plan/github.svg)](https://agentmods.dev/skills/sailfinio/sailfin/sfn-plan)

Your own site

<a href="https://agentmods.dev/skills/sailfinio/sailfin/sfn-plan"><img src="https://agentmods.dev/badge/skills/sailfinio/sailfin/sfn-plan/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/sailfinio/sailfin/sfn-plan"><img src="https://agentmods.dev/badge/skills/sailfinio/sailfin/sfn-plan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 75 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,878 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.

Model	Per session	Once invoked
Fable 5.1	$0.00075	$0.01878
Opus 5.5	$0.00030	$0.00751
Sonnet 5.5	$0.00015	$0.00376
Haiku 4.5	$0.00007	$0.00188

Measured 1mo ago against content hash 48accac19a31, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sfn-plan 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/sfn-plan/SKILL.md · 184 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

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.

agents/openai.yaml 280 B

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.

1mo ago First seen · 184 lines · 75 tokens per session scan A 48accac19a31

Subscribe to this mod's changes

sfn-plan is a skill published in the GitHub repository SailfinIO/sailfin (8 stars, last pushed 2d ago), licensed GPL-2.0. It adds 75 tokens to every session and 1,878 once invoked, about $0.0003 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.

Planning Project management capability-based-security compile-time-safety compiler concurrency programming-language runtime

sfn-plan next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
sfn-planSailfinIO/sailfin	Skill	8	2d ago	GPL-2.0	A	75	Codex
cicilisaman-pasha/cicili	Skill	50	5d ago	GPL-3.0	A	64	Claude Code, Codex
swift-docspledgeandgrow/pledge-skills	Skill	10	3mo ago	MIT	A	32	Claude Code, Codex
migrate-oxfmtoxc-project/oxc	Skill	23k	today	MIT	A	48	Claude Code, Codex
migrate-oxlintoxc-project/oxc	Skill	23k	today	MIT	A	44	Claude Code, Codex
insta-snapshotsoxc-project/oxc	Skill	23k	today	MIT	A	25	Claude Code, Codex
performance-lint-rulesoxc-project/oxc	Skill	23k	today	MIT	A	45	Claude Code, Codex

sailfin: Skill for Codex