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sunlight-skills: Instructions file for Claude Code

CLAUDE.md

sunlight-skills CLAUDE.md is an instructions file for Claude Code from sunlight-research-ai/sunlight-skills. It costs 153 tokens per session, scanned A, original, MIT.

Repository instructions for contributors maintaining portable AI-agent skills across Codex, Claude Code, and OpenCode.

In plain words
What is it for?
Use them when editing or reviewing skills in the sunlight-skills repository, especially before preparing a pull request.
Why use it?
They define how to change skills safely, keep them portable, protect private details, and validate updates.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions Claude Code; mentions Codex; mentions OpenCode.

This is sunlight-research-ai/sunlight-skills's own configuration. It tells Claude Code how to work on sunlight-skills 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 sunlight-skills configures →

not rated 5repo 4mo ago A scan 153 tokens original MIT
View source ↗ sunlight-research-ai/sunlight-skills
Reuse

Borrowing it

Nothing to install: this file belongs to sunlight-research-ai/sunlight-skills. 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/sunlight-research-ai/sunlight-skills/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/sunlight-research-ai/sunlight-skills

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.

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README.md
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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.

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Per session 153 This file is loaded in full into every session.
When invoked 153 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 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 $0.00153 $0.00153
Opus 5.5 $0.00061 $0.00061
Sonnet 5.5 $0.00031 $0.00031
Haiku 4.5 $0.00015 $0.00015

Measured 2mo ago against content hash f6b70be8e22d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sunlight-skills 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 2mo 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 · 26 lines

What it actually says

Sunlight Skills Contributor Guide

This repository contains public agent skills. Changes should preserve portability across Codex, Claude Code, and OpenCode unless a skill explicitly documents a narrower runtime.

For AI Agents

Before changing a skill:

  1. Read the target SKILL.md.
  2. Read any directly referenced files in references/ that apply to the change.
  3. Keep instructions concise and operational.
  4. Do not add private Sunlight Platform paths, secrets, or assumptions.
  5. Validate the changed skill before claiming completion.

Pull Requests

Every PR should explain:

  • which skill changed
  • what user behavior should improve
  • what runtime was tested
  • what validation was run

New skills belong under skills/<skill-name>/.

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. 2mo ago First seen · 26 lines · 153 tokens per session scan A f6b70be8e22d

Subscribe to this mod's changes

sunlight-skills CLAUDE.md is an instructions file published in the GitHub repository sunlight-research-ai/sunlight-skills (5 stars, last pushed 4mo ago), licensed MIT. It adds 153 tokens to every session, about $0.0006 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 2026-08-31.

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