What is sailfin CLAUDE.md?

A project-specific instruction guide for Claude Code, an AI coding assistant. It describes Sailfin's validation steps, important files, pipeline, and readiness checks.

Use it to guide Claude Code while working on Sailfin, especially when checking critical files, pipeline stages, or design decisions.

It gives the assistant the project's rules and structure instead of making it guess how to validate or change the code.

How SailfinIO/sailfin configures Claude Code

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/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/SailfinIO/sailfin

Made for: Claude Code.

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/instructions/sailfinio/sailfin/claude-md/github.svg)](https://agentmods.dev/instructions/sailfinio/sailfin/claude-md)

Your own site

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

Per session 3,406 This file is loaded in full into every session.

When invoked 3,406 The same file — it is already loaded in full.

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	$0.03406	$0.03406
Opus 5.5	$0.01362	$0.01362
Sonnet 5.5	$0.00681	$0.00681
Haiku 4.5	$0.00341	$0.00341

Measured 1mo ago against content hash 643d8eec65cc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sailfin CLAUDE.md 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.

CLAUDE.md · 225 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.

1mo ago First seen · 225 lines · 3,406 tokens per session scan A 643d8eec65cc

Subscribe to this mod's changes

sailfin CLAUDE.md is an instructions file published in the GitHub repository SailfinIO/sailfin (8 stars, last pushed 2d ago), licensed GPL-2.0. It adds 3,406 tokens to every session, about $0.0136 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.

Building agents Writing and docs capability-based-security compile-time-safety compiler concurrency programming-language runtime

sailfin CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
sailfin CLAUDE.mdSailfinIO/sailfin	Instructions file	8	2d ago	GPL-2.0	A	3,406	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

sailfin: Instructions file for Claude Code