Agent Friendly Code
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vercel/next.jsGitHub

https://github.com/vercel/next.js
Stars:
139.1k
Default branch:
canary
Last scored:
3h ago
Overall

Strengths

  • AGENTS.md / CLAUDE.md
  • CI configuration
  • CONTRIBUTING guide
  • Dependency manifest
  • License file

Gaps

  • No missing signals — nice.

Suggestions to improve for a specific model

  1. 1
    Manageable size
    If possible, split into smaller modules or carve out a focused entry path. Document where to start in AGENTS.md.
    +5.3 pts
  2. 2
    Reproducible dev env
    Add a Makefile or devcontainer or Dockerfile so the agent can set up the project in one command.
    +3.6 pts

Per-model scores

Claude Code
Weights AGENTS.md and tests heavily — Claude Code leans on an instructions file and a fast feedback loop.
91.2
Cursor
Weights type config and a detailed README highly — Cursor's inline edits benefit from static types and skim-readable docs.
93.4
Devin
Weights CI and reproducible envs highly — Devin runs in a sandboxed VM and needs end-to-end automation.
90.3
GPT-5 Codex
Balanced profile as a reference point.
91.6

Signal breakdown

AGENTS.md / CLAUDE.md· 100% pass
Substantive (21450 chars)
AGENTS.md
CI configuration· 100% pass
33 GitHub Actions workflow(s)
.github/workflows
CONTRIBUTING guide· 100% pass
Guide present
CONTRIBUTING.md
Dependency manifest· 100% pass
Manifest present
package.json
Reproducible dev env· 70% pass
Has .devcontainer/devcontainer.json
.devcontainer/devcontainer.json
License file· 100% pass
License present
LICENSE.md
Linter / formatter config· 100% pass
Config detected
eslint.config.mjs
Pre-commit / git hooks· 100% pass
Hook framework configured
.husky
README· 100% pass
README detailed (3211 chars)
README.md
Manageable size· 20% pass
10001+ files — very large
Test suite· 100% pass
Found /test
test
Type configuration· 100% pass
Type config present
tsconfig.json