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skillfile: Instructions file for Claude Code

CLAUDE.md

skillfile CLAUDE.md is an instructions file for Claude Code from eljulians/skillfile. It costs 1,815 tokens per session, scanned A, original, Apache-2.0.

A set of project instructions for coding agents contributing to skillfile, a Rust command-line tool that manages AI skill and agent markdown files.

In plain words
What is it for?
Use it when developing or maintaining skillfile, especially its parsing, source fetching, deployment, command-line, lock-file, patch, and test code.
Why use it?
It keeps changes consistent with the project's documented design, dependency direction, tests, and safety rules.

Instructions file for Claude Code

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

This is eljulians/skillfile's own configuration. It tells Claude Code how to work on skillfile 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 skillfile configures →

not rated 176repo +2 23d ago A scan 1,815 tokens original Apache-2.0
View source ↗ eljulians/skillfile
Reuse

Borrowing it

Nothing to install: this file belongs to eljulians/skillfile. 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/eljulians/skillfile/master/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/eljulians/skillfile

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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Your own site
<a href="https://agentmods.dev/instructions/eljulians/skillfile/claude-md"><img src="https://agentmods.dev/badge/instructions/eljulians/skillfile/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.

agentmods 80×15 button for skillfile CLAUDE.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/eljulians/skillfile/claude-md"><img src="https://agentmods.dev/badge/instructions/eljulians/skillfile/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,815 This file is loaded in full into every session.
When invoked 1,815 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 $0.01815 $0.01815
Opus 5.5 $0.00726 $0.00726
Sonnet 5.5 $0.00363 $0.00363
Haiku 4.5 $0.00181 $0.00181

Measured 1mo ago against content hash ffb6c1b23b2b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skillfile 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 · 132 lines

How it starts

The opening of the file, as written. The whole thing — 132 lines — stays where its author put it; the contents beside it link to each section on GitHub.

skillfile Development Guide

This file is for maintainers and contributors using Claude Code or similar coding agents in this repository. Keep changes aligned with the public project contract in README.md and SPEC.md.

Project Shape

skillfile is a Rust workspace CLI for managing AI skill and agent markdown files. It reads a Skillfile, fetches upstream content, locks exact revisions, preserves local edits as patches, and deploys to supported AI tool directories.

Workspace dependency direction is strict:

core <- sources <- deploy <- cli
  • crates/core: models, parsing, lock files, conflicts, patches, output, errors.
  • crates/sources: HTTP clients, GitHub/GitLab/registry resolution, sync logic.
  • crates/deploy: platform adapters and install orchestration.
  • crates/cli: clap commands, TUI flows, update checks, binary entrypoint.
  • tests: workspace-level functional tests that spawn the CLI.
  • fuzz: parser fuzz target, excluded from the normal workspace.

Architecture Standards

  • Keep domain models and format rules in core; do not let core depend on network, deployment, terminal UI, or command concerns.
  • Keep source fetching and registry behavior in sources; do not bypass HttpClient when code needs to be testable.
  • Keep platform-specific filesystem layout behind PlatformAdapter; avoid hardcoded per-tool branching in command code.
  • Keep CLI code as orchestration and presentation. Reusable behavior belongs in the lower crate that owns the concept.
  • Preserve backward compatibility for Skillfile, Skillfile.lock, patch paths, and installed layout unless SPEC.md is updated in the same change.
  • Prefer typed domain errors in library crates via SkillfileError; reserve anyhow for top-level CLI reporting.
  • Do not add broad abstractions for hypothetical future platforms, sources, or entity types. Add extension points when a concrete second use case exists.
  • When changing a public contract, include the migration story, docs update, and tests that lock the new behavior.

Read the full file on GitHub · 132 lines

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 · 132 lines · 1,815 tokens per session scan A ffb6c1b23b2b

Subscribe to this mod's changes

skillfile CLAUDE.md is an instructions file published in the GitHub repository eljulians/skillfile (176 stars, last pushed 23d ago), licensed Apache-2.0. It adds 1,815 tokens to every session, about $0.0073 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 2026-08-30.

Claude Codeai-agentsai-skillsai-toolsclaudecli
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