What is opensrc AGENTS.md?

Repository instructions for OpenSrc, a Turborepo monorepo containing a Rust command-line tool and a Next.js documentation site. A monorepo keeps multiple related projects in one repository.

Use it when working on the Rust CLI, the documentation site, or a release. It lists development, build, test, format, lint, and release commands.

It tells coding agents where the main parts of the project live and which commands maintainers use. This reduces confusion when building, testing, formatting, linting, or releasing.

How vercel-labs/opensrc configures Codex and OpenCode

About the project

opensrc is a command-line tool that retrieves and caches the source code of packages from npm, PyPI, crates.io, and GitHub. Coding agents use it to inspect dependency implementations and gain more context while helping with software projects. The catalogue skill supports agents in using the CLI.

vercel-labs/opensrc · 3,027 stars · on GitHub · opensrc.sh

Reuse

Borrowing it

Nothing to install: this file belongs to vercel-labs/opensrc. 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/vercel-labs/opensrc/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/vercel-labs/opensrc

Made for: Codex, OpenCode.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/vercel-labs/opensrc/agents-md/github.svg)](https://agentmods.dev/instructions/vercel-labs/opensrc/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/vercel-labs/opensrc/agents-md"><img src="https://agentmods.dev/badge/instructions/vercel-labs/opensrc/agents-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/vercel-labs/opensrc/agents-md"><img src="https://agentmods.dev/badge/instructions/vercel-labs/opensrc/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 822 This file is loaded in full into every session.

When invoked 822 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.

Model	Per session	Once invoked
Fable 5.1	$0.00822	$0.00822
Opus 5.5	$0.00329	$0.00329
Sonnet 5.5	$0.00164	$0.00164
Haiku 4.5	$0.00082	$0.00082

Measured 2mo ago against content hash f735efc8e777, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

opensrc AGENTS.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.

AGENTS.md · 85 lines

How it starts

The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Instructions for AI coding agents working with this codebase.

Monorepo Structure

This is a Turborepo monorepo with pnpm workspaces:

packages/opensrc/ — Rust CLI distributed via npm
apps/docs/ — Next.js documentation site

CLI (packages/opensrc)

The CLI is a Rust binary with an npm shim. The Rust crate lives in packages/opensrc/cli/.

Build: cargo build --manifest-path packages/opensrc/cli/Cargo.toml
Test: cargo test --manifest-path packages/opensrc/cli/Cargo.toml
Format: cargo fmt --manifest-path packages/opensrc/cli/Cargo.toml
Lint: cargo clippy --manifest-path packages/opensrc/cli/Cargo.toml -- -D warnings
Release build + copy to bin/: cd packages/opensrc && npm run build:native

Docs (apps/docs)

Dev: cd apps/docs && pnpm dev
Build: cd apps/docs && pnpm build

Or from root: turbo dev, turbo build

Releasing

Releases are manual, single-PR affairs. The maintainer controls the changelog voice and format.

To prepare a release:

Create a branch (e.g. prepare-v0.7.0)
Bump version in packages/opensrc/package.json
Run cd packages/opensrc && npm run version:sync to update cli/Cargo.toml and cli/Cargo.lock
Write the changelog entry in CHANGELOG.md at the top, under a new ## <version> heading, wrapped in  and  markers. Remove the markers from the previous release entry so only the new release has markers.
Open a PR and merge to main

When the PR merges, CI compares packages/opensrc/package.json version to what's on npm. If it differs, it builds all 7 platform binaries, publishes to npm, and creates the GitHub release automatically. The GitHub release body is extracted from the content between the  and  markers in CHANGELOG.md.

Writing the changelog

Review the git log since the last release and write the entry in CHANGELOG.md. Follow the existing format and voice. Group changes under ### New Features, ### Bug Fixes, ### Improvements, etc. Bold the feature/fix name, then describe it concisely. Reference PR numbers in parentheses.

Read the full file on GitHub · 85 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.

2mo ago First seen · 85 lines · 822 tokens per session scan A f735efc8e777

Subscribe to this mod's changes

opensrc AGENTS.md is an instructions file published in the GitHub repository vercel-labs/opensrc (3,027 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 822 tokens to every session, about $0.0033 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.

LLM ai ai-coding cli coding-agents developer-tools

opensrc AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
opensrc AGENTS.mdvercel-labs/opensrc	Instructions file	3.0k	1mo ago	Apache-2.0	A	822	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

opensrc: Instructions file for Codex