Zod is a TypeScript library that checks whether data matches defined schemas while also deriving corresponding static types. It is used by developers to validate data at runtime in TypeScript applications.
Borrowing it
Nothing to install: this file belongs to colinhacks/zod. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/colinhacks/zod/main/AGENTS.mdgit clone --depth 1 https://github.com/colinhacks/zodWrote 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.
[](https://agentmods.dev/instructions/colinhacks/zod/agents-md)<a href="https://agentmods.dev/instructions/colinhacks/zod/agents-md"><img src="https://agentmods.dev/badge/instructions/colinhacks/zod/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.
<a href="https://agentmods.dev/instructions/colinhacks/zod/agents-md"><img src="https://agentmods.dev/badge/instructions/colinhacks/zod/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.05135 | $0.05135 |
| Opus 5.5 | $0.02054 | $0.02054 |
| Sonnet 5.5 | $0.01027 | $0.01027 |
| Haiku 4.5 | $0.00513 | $0.00513 |
Grade A, and why
zod 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 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.
How it starts
The opening of the file, as written. The whole thing — 184 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Development Commands
Use Nub exclusively for dependency management, scripts, and TypeScript execution. The root package.json declares the workspaces and pins Nub; .nvmrc selects Node. Nub reads and writes the existing pnpm-lock.yaml without requiring pnpm.
Run scripts with nub run, repository TypeScript with nub <file>, and installed tools with nub exec --node <tool>. Keep third-party tools and built-package compatibility probes on plain Node; Nub's augmentation must not mask resolution errors or change test behavior. Use nub install --frozen-lockfile for reproducible installs and nub add / nub remove to manage dependencies.
Key commands:
nub run build- Build all packages (runs recursive build command)nub exec --node vitest run- Run all tests with Vitest. Includes the compile-mode project, which re-runs the zod tests with global AOT compilation enabled (seewiki/compile.md).nub exec --node vitest run <path>- Run specific test file (e.g.,packages/zod/src/v4/classic/tests/string.test.ts)nub exec --node vitest run <path> -t "<pattern>"- Run specific test(s) within a file (e.g.,-t "MAC")nub exec --node vitest run --update- Update all test snapshotsnub exec --node vitest run <path> --update- Update snapshots for specific test filenub run test:watch- Run tests in watch modenub exec --node vitest run --coverage- Run tests with coverage reportnub run test:compile- Focused alias for just the compile-mode project. Already covered bynub run test; use this when iterating on compile-related changes.nub run dev- Execute TypeScript with Nub under source conditionsnub run dev <file>- Execute<file>with Nub & proper resolution conditions. Usually use forplay.ts.nub run dev:play- Quick alias to run play.ts for experimentationnub run check:comments- Fail on stacked//comment lines (--fixjoins them)nub run lint- Run biome linter with auto-fixnub run format- Format code with biomenub run fix- Run both format and lint
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.
- 1mo ago Changed · -42 lines · -1,057 tokens per session cecbb81057e3
- 1mo ago Changed · +6 lines · +263 tokens per session a69d002a6e85
- 1mo ago Changed · +4 lines · +155 tokens per session 24ebc3d7ce01
- 1mo ago First seen · 216 lines · 5,774 tokens per session scan A 2a47d6886e23
zod AGENTS.md is an instructions file published in the GitHub repository colinhacks/zod (44,202 stars, last pushed 7d ago), licensed MIT. It adds 5,135 tokens to every session, about $0.0205 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.