RGESN
Environmental design of digital services, from user need to infrastructure and lifecycle.
Open guidance for sustainable software
Build less. Measure what matters.
Green Codex brings Green IT, accessibility and responsible AI practices into the coding workflow. It gives Codex evidence-based rules for designing, implementing, reviewing and auditing digital services.
One skill, four reference frameworks
GR491
Responsible design decisions across UX, frontend, backend, data, hosting and governance.
Opquast
Reliable, understandable and robust web experiences that complement environmental checks.
RGAA
Keyboard, focus, semantics, contrast, language and assistive technology checks.
Use it in any project
- Audit a codebase or architecture with cited evidence.
- Review a pull request for environmental and accessibility risks.
- Choose measurable, reversible improvements without sacrificing resilience.
- Keep official acronyms and references intact.
Rules that adapt to your stack
Green Codex routes universal NR practices and language-specific checks to the technologies it detects. The catalogue covers Java, Rust, C, C++, Go, Python, JavaScript and TypeScript, PHP, Ruby, Scala, Kotlin, Julia, Nim, Zig, Shell, SQL, PL/SQL, HTML5, CSS3, React, Vue, Angular, Svelte, Preact, Astro and Solid.
Each assessed rule returns PASS, FAIL or REVIEW_REQUIRED with code location, impact, severity and evidence.
Useful, used and usable
Start with a confirmed user need. Compare useful outcomes with the current approach, observe actual use when the need occurs, and test independent task completion, including keyboard access. Keep three separate decisions; missing evidence stays REVIEW_REQUIRED.
Technical AI changes use relevant efficiency rules. Consult the responsible AI charter for an explicit assessment or an identified risk, without imposing an organisational checklist on every task.
Evaluation reports format and semantic review separately. Automated scans find narrow patterns and cannot establish real adoption, accessibility compliance or environmental savings.
Open and reusable
The skill is Apache-2.0 licensed for code and CC BY 4.0 licensed for rules and documentation. Contributions and translations are welcome through pull requests.
Maintained by experts
Green Codex is developed and maintained by the Institut du Numérique Responsable (INR) team:
Guillaume Gallon
@gridboy
Lead Maintainer
Guillaume Bourgeois
@bourgeoisguillaume01-glitch
Maintainer
Vincent Courboulay
@vincentcourboulay
Maintainer