Report · marked 8 Oct 2026

shadcn-ui/ui

An agent can work here, but it will waste turns finding its footing.

TypeScript · 125,122 stars · 6,066 files · branch main

61 /100 B-

Instructions 2/27Whether the repo tells an agent how to behave before it starts guessing. Losing marks on agent instruction file and instruction quality.Setup 14/20Whether an agent can install the project and get it running without a human. Losing marks on environment config and reproducible environment.Verification loop 25/25Whether an agent can check its own work. This is the category that most decides whether agent output is trustworthy. Full marks.Context economy 13/20Whether the repo fits in a context window, or fights it. Losing marks on file sizes fit in context and repository weight.Navigability 8/10How quickly anything new can orient itself. Losing marks on written documentation.

Higher is better. Accent marks what is costing you most.

Fix these first

Agent instruction file

Add an AGENTS.md at the root: what the project is, how to install, how to run, how to test, and the two or three conventions a newcomer always gets wrong.

Instruction quality

Instructions earn their keep by naming exact commands. 'Run the tests with `pnpm test`' beats three paragraphs of philosophy.

File sizes fit in context

A single file that fills the context window forces an agent to work from fragments, and it will confidently edit code it never saw. Splitting the worst offenders pays for itself immediately.

The full marking

Every deduction below names the file or setting it came from.

Instructions 2/27 F

Whether the repo tells an agent how to behave before it starts guessing.

✗Agent instruction file 0/12

None found. Every agent that opens this repo starts from zero.

Add an AGENTS.md at the root: what the project is, how to install, how to run, how to test, and the two or three conventions a newcomer always gets wrong.

Looked for AGENTS.md, CLAUDE.md, .github/copilot-instructions.md, .cursorrules

✗Instruction quality 0/12

Nothing to judge, since there are no instructions.

Instructions earn their keep by naming exact commands. 'Run the tests with `pnpm test`' beats three paragraphs of philosophy.

✗README as an entry point 2/3

README exists but never explains how to get the thing running.

Give the README an Install and a Usage heading with real commands under each. Agents pattern-match on those headings.

Setup 14/20 B+

Whether an agent can install the project and get it running without a human.

✓Deterministic install 6/6

pnpm-lock.yaml pins the dependency tree.

Found pnpm-lock.yaml

✓Discoverable commands 6/6

Commands are declared where an agent will look for them.

package.json scripts (build, build:packages, registry:build, registry:capture, registry:health, registry:health:prepare…)

scripts/ directory

✗Environment config 0/4

Nothing documents the environment this needs. An agent will get a runtime error it can't diagnose.

Add a .env.example listing every variable with a safe placeholder value. It's the cheapest possible fix and it unblocks the whole first run.

✓Pinned runtime version 2/2

The language runtime version is pinned.

Found .nvmrc

✗Reproducible environment 0/2

No container or devcontainer definition.

A Dockerfile or devcontainer removes an entire class of 'it won't install' failures.

Verification loop 25/25 A+

Whether an agent can check its own work. This is the category that most decides whether agent output is trustworthy.

✓Tests exist 8/8

733 test files against 4149 source files.

e.g. apps/v4/app/(app)/(create)/init/route.test.ts, apps/v4/app/(app)/(create)/lib/parse-config.test.ts, apps/v4/app/(app)/(create)/lib/parse-preset-input.test.ts

✓Test command is discoverable 7/7

An agent can find and run `npm run check`.

✓Continuous integration 4/4

11 GitHub Actions workflows define what "passing" means.

✓Lint and format rules 3/3

.eslintrc.json encodes the house style.

✓Static type checking 3/3

Strict type checking is on, which catches a whole class of agent mistakes before they run.

Context economy 13/20 B

Whether the repo fits in a context window, or fights it.

✓No committed build output 6/6

No generated directories committed.

✓.gitignore hygiene 3/3

.gitignore covers 36 patterns.

✗File sizes fit in context 0/6

8 source files are over 100KB.

A single file that fills the context window forces an agent to work from fragments, and it will confidently edit code it never saw. Splitting the worst offenders pays for itself immediately.

apps/v4/registry/__index__.tsx — 1051KB

apps/v4/registry/bases/__index__.tsx — 292KB

apps/v4/examples/__index__.tsx — 177KB

✗Repository weight 4/5

About 72.7MB checked out, which is comfortable.

Here is your AGENTS.md

Drafted from what is actually in this repository: the install command from your lockfile, the commands you already declare, your real directory layout. Anything marked TODO needs a person. Save it at the root as AGENTS.md.

AGENTS.md — drafted for shadcn-ui/ui

# AGENTS.md

Composable, accessible components with thoughtful defaults. Build your own component library with code you can customize, extend, and make your own.

## Setup

```
pnpm install
```

## Commands

```
pnpm dev              # run locally
pnpm build            # produce a build
pnpm test             # run the test suite, must pass before any commit
pnpm typecheck        # type check without emitting
pnpm lint             # lint
pnpm check            # lint and type check
pnpm build:packages
pnpm registry:build
```

## Layout

- `apps/`      3415 source files
- `packages/`  659 source files
- `templates/` 65 source files
- `scripts/`   1 source file

## Conventions

- Tests live alongside the code they cover, following `apps/v4/app/(app)/(create)/init/route.test.ts`.
- TypeScript runs in strict mode. Type errors are the fastest feedback available, so do not weaken it.
- CI defines what passing means. See `.github/workflows/browser-tests.yml`, and keep it green.
- TODO: add the two or three conventions a newcomer always gets wrong here.

## Gotchas

- `apps/v4/registry/__index__.tsx` is 1051KB. It will not fit comfortably in context, so read it in parts.

---

Drafted by agentreadme.com from what is in this repository. Everything marked TODO
needs a human. Check it in as AGENTS.md at the root.

Open the raw markdown or curl -o AGENTS.md agentreadme.com/draft/shadcn-ui/ui.md

A draft gets the commands right and stops at the things only a maintainer knows. What a good TypeScript AGENTS.md looks like covers what to add by hand, and what AGENTS.md is explains the format itself.

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