Report · marked 25 Aug 2026
LadybirdBrowser/ladybird
An agent can work here, but it will waste turns finding its footing.
C++ · 65,839 stars · 28,410 files · branch master
56
/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
10/16Whether an agent can install the project and get it running without a human. Losing marks on discoverable commands.Verification loop
22/22Whether an agent can check its own work. This is the category that most decides whether agent output is trustworthy. Full marks.Context economy
9/20Whether the repo fits in a context window, or fights it. Losing marks on file sizes fit in context and repository weight.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
Discoverable commands
Declare the handful of commands that matter in package.json scripts, a Makefile, or a justfile. Naming them turns guesswork into a lookup.
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 10/16 B
Whether an agent can install the project and get it running without a human.
✓Deterministic install
6/6
cargo.lock pins the dependency tree.
Found cargo.lock
✗Discoverable commands
0/6
No declared commands. An agent has to infer how to build and run this from the file tree.
Declare the handful of commands that matter in package.json scripts, a Makefile, or a justfile. Naming them turns guesswork into a lookup.
–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 rust-toolchain.toml
✓Reproducible environment
2/2
.devcontainer/devcontainer.json gives a known-good environment.
Verification loop 22/22 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
22136 test files against 7727 source files.
e.g. Libraries/LibJS/Flap/tests/interpreter-assembly/aarch64.S, Libraries/LibJS/Flap/tests/interpreter-assembly/x86_64.S, Libraries/LibJS/Flap/tests/interpreter-layout.conf
✓Test command is discoverable
7/7
An agent can find and run `cargo test`.
✓Continuous integration
4/4
16 GitHub Actions workflows define what "passing" means.
✓Lint and format rules
3/3
pyproject.toml encodes the house style.
–Static type checking
n/a
Not applicable — the Rust compiler type checks every build.
Context economy 9/20 C
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 51 patterns.
✗File sizes fit in context
0/6
83 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.
Libraries/LibWeb/Crypto/CryptoAlgorithms.cpp — 542KB
Libraries/LibWeb/DOM/Document.cpp — 457KB
Libraries/LibJS/Rust/src/bytecode/codegen.rs — 406KB
✗Repository weight
0/5
About 506MB checked out. Large enough that cloning and searching are both slow.
Large binaries and vendored trees slow every operation an agent performs. Git LFS or a separate assets repo keeps the working tree navigable.
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 Truly independent web browser ## Setup ``` cargo build ``` ## Commands ``` ruff check . # lint cargo test # run the test suite ``` ## Layout - `Libraries/` 4584 source files - `Tests/` 2543 source files - `AK/` 197 source files - `Meta/` 142 source files - `UI/` 123 source files - `Services/` 111 source files ## Conventions - Tests live alongside the code they cover, following `Libraries/LibJS/Flap/tests/interpreter-assembly/aarch64.S`. - CI defines what passing means. See `.github/workflows/ci-image.yml`, and keep it green. - TODO: add the two or three conventions a newcomer always gets wrong here. ## Gotchas - `Libraries/LibWeb/Crypto/CryptoAlgorithms.cpp` is 542KB. 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/LadybirdBrowser/ladybird.md
Show the mark
The badge re-checks daily, so it keeps up as the repository changes. Use mark again to force it now.
[](https://agentreadme.com/LadybirdBrowser/ladybird)Other C++ repositories, marked
Think this mark is wrong?
Every deduction above names the file it came from, so this can be settled by looking. If a check missed something, that is a rule worth fixing.