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prysm: Skill for Claude Code

.agents/skills/precheck/SKILL.md

precheck is a skill for Claude Code, Codex from OffchainLabs/prysm. It costs 35 tokens per session (471 once invoked), scanned A, original, GPL-3.0.

A pre-commit checklist for Prysm changes, a Go project, that runs formatting, import updates, code generation, and a build.

In plain words
What is it for?
Run the project's formatting tools, generators, and build before committing Prysm changes.
Why use it?
It catches required checks before a commit, reducing avoidable errors in the repository.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

This is OffchainLabs/prysm's own configuration. It tells Claude Code and Codex how to work on prysm 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 prysm configures →

not rated 3.8krepo +2 yesterday A scan SkillSpector: pass 35 tokens GPL-3.0
View source ↗ OffchainLabs/prysm offchainlabs.com
About the project

Prysm is an Ethereum consensus implementation written in Go, providing the software needed to implement the network's proof-of-stake consensus specification. Ethereum developers and validators use it to run and work with consensus components. The catalogue contains shared agent skills for contributing to this repository.

OffchainLabs/prysm · 3,791 stars · on GitHub · offchainlabs.com

Reuse

Borrowing it

Nothing to install: this file belongs to OffchainLabs/prysm. 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/OffchainLabs/prysm/develop/.agents/skills/precheck/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/OffchainLabs/prysm

Made for: Claude Code, 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.

agentmods badge for precheck

README.md
[![agentmods](https://agentmods.dev/badge/skills/offchainlabs/prysm/precheck/github.svg)](https://agentmods.dev/skills/offchainlabs/prysm/precheck)
Your own site
<a href="https://agentmods.dev/skills/offchainlabs/prysm/precheck"><img src="https://agentmods.dev/badge/skills/offchainlabs/prysm/precheck/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 precheck

Your own site · 80×15
<a href="https://agentmods.dev/skills/offchainlabs/prysm/precheck"><img src="https://agentmods.dev/badge/skills/offchainlabs/prysm/precheck.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 471 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00035 $0.00471
Opus 5.5 $0.00014 $0.00188
Sonnet 5.5 $0.00007 $0.00094
Haiku 4.5 $0.00003 $0.00047

Measured 2mo ago against content hash 51bf4c931f7b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

precheck 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.

.agents/skills/precheck/SKILL.md · 50 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, 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. 2mo ago First seen · 50 lines · 35 tokens per session scan A 51bf4c931f7b

Subscribe to this mod's changes

precheck is a skill published in the GitHub repository OffchainLabs/prysm (3,791 stars, last pushed yesterday), licensed GPL-3.0. It adds 35 tokens to every session and 471 once invoked, about $0.0001 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.

CommitsGit and workflowethereum
Related

precheck compared with skills from other repositories

precheck next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
precheckOffchainLabs/prysmSkill3.8kyesterdayGPL-3.0A35Claude Code, Codex
git-workflowhiromaily/go-crypto-walletSkill1286mo agoMITA31Claude Code
fix-pr-reviewhiromaily/go-crypto-walletSkill1286mo agoMITA26Claude Code
git-wrapupcyanheads/coingecko-mcp-serverSkill120d agoApache-2.0A109Claude Code
git-workflow0xlayerghost/solidity-agent-kitSkill418d agoMITA60Claude Code, Codex
create-prprisma/ormSkill48kyesterdayApache-2.0A48Claude Code, Codex
git-commitThinkInAIXYZ/deepchatSkill6.4kyesterdayApache-2.0A15Claude Code, Codex