Agent rules and skills from open source.

NousResearch/hermes-agent

A root guide to the CLI, gateway, desktop app, plugins, prompt caching, isolated tests, and a six-step capability ladder.

anomalyco/opencode

A code-heavy guide to simple abstractions, session invariants, helper-based flow, and wrong-versus-right examples.

firecrawl/firecrawl

A concise API guide to success and failure paths, environment-gated tests, one service harness, local runs, and CI.

openai/codex

A dense Rust guide covering style, module boundaries, reviews, snapshot tests, app-server APIs, change scope, and model context.

electron/electron

A guide to multi-repository builds, patches, C++ object lifetimes, release maintenance, and alternatives to costly commands.

pytorch/pytorch

A contribution guide to native builds, tests, CUDA, ghstack, CI traps, and project-specific Python and Git commands.

vllm-project/vllm

A testing guide to contracts, correctness, performance evidence, model evaluations, native builds, security, and benchmarks.

storybookjs/storybook

A broad guide to repository structure, architecture, commands, pull requests, tests, self-maintenance, and maintainer preferences.

zed-industries/zed

A Rust and GPUI guide to errors, state, concurrency, review markers, instruction symlinks, and permanent rules.

grafana/grafana

A Go and TypeScript guide to local instructions, test skills, generators, environment differences, deployments, and compatibility.

strapi/strapi

A Yarn and Nx guide to content access, dependency injection, shared types, edition boundaries, tests, skills, and migrations.

withastro/astro

A monorepo guide covering work planning, repository structure, tests, background development servers, and browser automation.

twentyhq/twenty

A compact CRM guide to package conventions, recurring mistakes, tests, migrations, branch output, and Nx cache traps.

TanStack/query

A minimal guide linking contributor instructions, applying them to AI-assisted work, and limiting changes to one topic.

astral-sh/ruff

A Rust workspace guide to environment traps, Markdown tests, ty-specific work, security reviews, and focused references.

calcom/cal.diy

Practical examples and firm rules for pull-request size, imports, data access, security, and approval-gated work.

streamlit/streamlit

A Python, React, and protobuf guide to separate checks, dependency exceptions, restarts, debugging logs, and test wrappers.

payloadcms/payload

A CMS guide to architecture, test fixtures, access control, React memoization, CSS, server-client imports, and bundling.

gradio-app/gradio

A Python and Svelte guide to issue ownership, AI disclosure, human review, release notes, builds, and tests.

pnpm/pnpm

A three-product guide to local instructions, version policy, dual CLIs, stale bundled tests, releases, and skill discovery.

sgl-project/sglang

A Mintlify guide to source priorities, page structure, components, navigation, validation, and hardware-specific examples.

huggingface/diffusers

A shared guide to setup, approval-gated actions, self-review, publication boundaries, and focused model and testing references.

rustfs/rustfs

A layered guide to instruction precedence, permission-gated actions, verification tiers, storage rules, and review evidence.

better-auth/better-auth

A contract-first guide to bug reports, shared Vitest helpers, and portable library code across Node.js, Bun, Deno, and Workers.

langchain-ai/deepagents

A short root guide to compatibility, repository searches, generated references, test quality, and focused local instructions.

openai/openai-agents-python

A Python SDK guide to scope, released contracts, branch-local choices, visible-behavior tests, architecture, and compatibility.

nrwl/nx

A workspace guide to planning, generated sections, docs, affected-project tests, E2E checks, and external package testing.

manaflow-ai/cmux

A macOS guide to isolated app builds, sockets, terminal testing gaps, component skills, and protecting the main app.

biomejs/biome

A concise guide to source-backed analysis, generators, contributor messaging, testing, reviews, changesets, and docs.

tursodatabase/turso

A development guide to commands, subsystem boundaries, core principles, code and comment style, and banned metaphors.

temporalio/temporal

A compact guide to agent role, response length, tone, repository structure, commands, tests, and planning.

oxc-project/oxc

A Rust workspace guide to crate-specific tests, generators, conformance suites, Node bindings, and contribution responsibilities.

marimo-team/marimo

A Python and frontend guide to user impact, tests, contribution rules, AI disclosure, and a subtle docstring convention.

pingdotgg/t3code

A self-hosted guide to live-process safety, database protection, cross-client checks, providers, and command-to-event flow.

gitbutlerapp/gitbutler

A short root guide covering instruction precedence, repository structure, working style, and links to local instructions.

pydantic/pydantic-ai

A scope-conscious guide to user impact, compatibility, verification, sibling defects, API defaults, and focused local rules.

rolldown/rolldown

A three-layer runtime guide to generated bindings, internal docs, and CI for browsers, Windows, and WebContainers.

lancedb/lancedb

A cross-language guide tracing table methods through native and remote code, bindings, Python APIs, generated code, and docs.

fastrepl/anarlog

Separate TypeScript and Rust guides to component checks, native release evidence, generated files, and database constraints.

pydantic/logfire

An SDK and docs guide to realistic telemetry tests, source locations, CI coverage gates, and repository-backed checks.

TanStack/db

A review guide with good and bad query examples, independent test oracles, counterexamples, and escaped-bug analysis.

openai/openai-agents-js

A TypeScript SDK guide to conditional skills, supported contracts, architecture, review scope, docs risk, and compiled examples.

railwayapp/railpack

A build-system guide tracing detection through containers, with mise tasks, generated files, fixtures, and runtime checks.