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sailfin: Command for Claude Code

.claude/commands/add-feature.md

add-feature is a command for Claude Code from SailfinIO/sailfin. It costs 0 tokens per session (1,190 once invoked), scanned A, original, GPL-2.0.

A command that coordinates the complete process for adding a new programming-language feature to Sailfin, from design to documentation.

In plain words
What is it for?
Use it when planning and implementing a new Sailfin language feature and documenting it.
Why use it?
It keeps the stages of a language-feature change together so the work is not limited to code edits alone.

Command for Claude Code

Written for Claude Code: installed under .claude/.

This is SailfinIO/sailfin's own configuration. It tells Claude Code 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 0 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/.claude/commands/add-feature.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.

agentmods badge for add-feature

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

Your own site · 80×15
<a href="https://agentmods.dev/commands/sailfinio/sailfin/add-feature"><img src="https://agentmods.dev/badge/commands/sailfinio/sailfin/add-feature.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,190 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 $0.00000 $0.01190
Opus 5.5 $0.00000 $0.00476
Sonnet 5.5 $0.00000 $0.00238
Haiku 4.5 $0.00000 $0.00119

Measured 1mo ago against content hash a0170f8d5db2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

add-feature 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/commands/add-feature.md · 102 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 · 102 lines · 0 tokens per session scan A a0170f8d5db2

Subscribe to this mod's changes

add-feature is a command published in the GitHub repository SailfinIO/sailfin (8 stars, last pushed 2d ago), licensed GPL-2.0. It costs nothing until one of its globs matches a file; then it loads 1,190 tokens. 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.

LanguagesPlanningcapability-based-securitycompile-time-safetycompilerconcurrencyprogramming-languageruntime
Related

add-feature compared with commands from other repositories

add-feature next to 6 commands from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
add-featureSailfinIO/sailfinCommand82d agoGPL-2.0A0Claude Code
verify-claimAwesome-Embedded-Learning-Studio/Tutorial_AwesomeModernCPPCommand3543d agoMITA37Claude Code
explainAwesome-Embedded-Learning-Studio/Tutorial_AwesomeModernCPPCommand3543d agoMITA41Claude Code
fastapimfmezger/ai_agent_dotfilesCommand73mo agoMITA84Claude Code, Gemini CLI
azure-graph-dotnet:deploy-azureTheLobbi/Claude-mCommand181mo agononeA57Claude Code
cli-enhancegeoffjay/claude-pluginsCommand81y agoMITA24Claude Code
gen-ts-api-codezhanyoulin456/seevin-claude-pluginsCommand49mo agoMITA9Claude Code