agentreadme

Report · marked 26 Aug 2026

iamkun/dayjs

Solid foundations, held back in a few specific places.

JavaScript · 48,666 stars · 380 files · branch dev

70 /100 B+
Instructions 3/27Whether the repo tells an agent how to behave before it starts guessing. Losing marks on agent instruction file and instruction quality.Setup 12/14Whether an agent can install the project and get it running without a human. Losing marks on pinned runtime version.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 20/20Whether the repo fits in a context window, or fights it. Full marks.Navigability 10/10How quickly anything new can orient itself. Full marks.

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

Fix these first

01
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.
02
Instruction quality
Instructions earn their keep by naming exact commands. 'Run the tests with `pnpm test`' beats three paragraphs of philosophy.
03
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.

The full marking

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

Instructions 3/27 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 3/3
README has a clear getting-started section.
Setup 12/14 A

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

✓Deterministic install 6/6
package-lock.json pins the dependency tree.
Found package-lock.json
✓Discoverable commands 6/6
Commands are declared where an agent will look for them.
package.json scripts (test, test-tz, test-tz-plugin, lint, prettier, babel…)
–Environment config n/a
Not applicable — this reads as a library, with no environment to configure.
✗Pinned runtime version 0/2
No pinned runtime version.
Add a .nvmrc, .python-version, or equivalent so the agent's toolchain matches yours.
–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
96 test files against 326 source files.
e.g. .github/workflows/lint-test.yml, test/__mocks__/dayjs.js, test/browser.spec.js
✓Test command is discoverable 7/7
An agent can find and run `npm run test`.
✓Continuous integration 4/4
3 GitHub Actions workflows define what "passing" means.
✓Lint and format rules 3/3
.eslintrc.json 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 20/20 A+

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 13 patterns.
✓File sizes fit in context 6/6
No source file is large enough to crowd out a context window.
✓Repository weight 5/5
About 6.2MB 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 iamkun/dayjs 
# AGENTS.md

⏰ Day.js 2kB immutable date-time library alternative to Moment.js with the same modern API

## Setup

```
npm ci
```

## Commands

```
npm run build            # produce a build
npm run test             # run the test suite, must pass before any commit
npm run lint             # lint
npm run test-tz
npm run test-tz-plugin
npm run prettier
npm run babel
npm run sauce
```

## Layout

- `src/`   184 source files
- `test/`  95 source files
- `types/` 40 source files
- `build/` 3 source files
- `docs/`  1 source file

## Conventions

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

## Gotchas

- Generated output is committed (`build/`). Search will return the compiled copy, so edit the source, not that.

---

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/iamkun/dayjs.md

Show the mark

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agent ready 70 out of 100

[![agent ready](https://agentreadme.com/badge/iamkun/dayjs.svg)](https://agentreadme.com/iamkun/dayjs)

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All JavaScript repositories

Think this mark is wrong?

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