Report · marked 25 Aug 2026

remix-run/react-router

Ready for an agent to work in without hand-holding.

TypeScript · 56,572 stars · 1,189 files · branch main

90 /100 A

Instructions 26/27Whether the repo tells an agent how to behave before it starts guessing. Losing marks on readme as an entry point.Setup 14/14Whether an agent can install the project and get it running without a human. Full marks.Verification loop 22/25Whether an agent can check its own work. This is the category that most decides whether agent output is trustworthy. Losing marks on static type checking.Context economy 15/20Whether the repo fits in a context window, or fights it. Losing marks on file sizes fit in context and repository weight.Navigability 9/10How quickly anything new can orient itself. Losing marks on repository description.

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

Fix these first

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.

Static type checking

A type checker gives an agent an error message instead of a runtime surprise. It's the second-fastest feedback loop after the compiler.

README as an entry point

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

The full marking

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

Instructions 26/27 A+

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

✓Agent instruction file 12/12

AGENTS.md is present, which is the format the most tools read.

Also found: CLAUDE.md

✓Instruction quality 12/12

Specific enough that an agent can act on it.

7,400 characters, a workable length

names the actual commands to run

uses headings, so an agent can skim it

includes copyable code blocks

✗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 14/14 A+

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, watch, changes:add, changes:publish, changes:pr, changes:preview…)

scripts/ directory

–Environment config n/a

Not applicable — this reads as a library, with no environment to configure.

✓Pinned runtime version 2/2

The language runtime version is pinned.

Found .nvmrc

–Reproducible environment n/a

Not applicable — a library doesn't need a container to be worked on.

Verification loop 22/25 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

295 test files against 695 source files.

e.g. integration/abort-signal-test.ts, integration/action-test.ts, integration/blocking-test.ts

✓Test command is discoverable 7/7

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

✓Continuous integration 4/4

13 GitHub Actions workflows define what "passing" means.

✓Lint and format rules 3/3

eslint.config.ts encodes the house style.

✗Static type checking 0/3

No static type checking.

A type checker gives an agent an error message instead of a runtime surprise. It's the second-fastest feedback loop after the compiler.

Context economy 15/20 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 31 patterns.

✗File sizes fit in context 2/6

11 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.

packages/react-router/__tests__/dom/data-browser-router-test.tsx — 271KB

packages/react-router/lib/router/router.ts — 233KB

integration/single-fetch-test.ts — 144KB

✗Repository weight 4/5

About 51.6MB 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 remix-run/react-router

# AGENTS.md

Declarative routing for React

## Setup

```
pnpm install
```

## Commands

```
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 format            # format
pnpm watch
pnpm changes:add
pnpm changes:publish
```

## Layout

- `packages/`    379 source files
- `playground/`  146 source files
- `integration/` 133 source files
- `scripts/`     24 source files
- `tutorials/`   5 source files
- `jest/`        3 source files

## Conventions

- Tests live alongside the code they cover, following `integration/abort-signal-test.ts`.
- CI defines what passing means. See `.github/workflows/change-file-check.yml`, and keep it green.
- TODO: add the two or three conventions a newcomer always gets wrong here.

## Gotchas

- `packages/react-router/__tests__/dom/data-browser-router-test.tsx` is 271KB. 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/remix-run/react-router.md

Show the mark

The badge re-checks daily, so it keeps up as the repository changes. Use mark again to force it now.

[![agent ready](https://agentreadme.com/badge/remix-run/react-router.svg)](https://agentreadme.com/remix-run/react-router)

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Think this mark is wrong?

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