What is devoxx-2026 AGENTS.md?

Cross-project instructions for a Flutter frontend and Rust backend, using Clean Architecture and Hexagonal Architecture to keep business rules separate from interfaces and infrastructure.

Use them when adding frontend features, backend use cases, domain models, data adapters, REST handlers, or persistence code.

They prevent dependencies from crossing the wrong architectural boundaries and keep business logic out of UI widgets and HTTP handlers.

How b-fontaine/devoxx-2026 configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to b-fontaine/devoxx-2026. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/b-fontaine/devoxx-2026/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/b-fontaine/devoxx-2026

Made for: Codex, OpenCode.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/b-fontaine/devoxx-2026/agents-md/github.svg)](https://agentmods.dev/instructions/b-fontaine/devoxx-2026/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/b-fontaine/devoxx-2026/agents-md"><img src="https://agentmods.dev/badge/instructions/b-fontaine/devoxx-2026/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/b-fontaine/devoxx-2026/agents-md"><img src="https://agentmods.dev/badge/instructions/b-fontaine/devoxx-2026/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,142 This file is loaded in full into every session.

When invoked 2,142 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.02142	$0.02142
Opus 5.5	$0.00857	$0.00857
Sonnet 5.5	$0.00428	$0.00428
Haiku 4.5	$0.00214	$0.00214

Measured 2mo ago against content hash 5b0994cc7261, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

devoxx-2026 AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

AGENTS.md · 211 lines

How it starts

The opening of the file, as written. The whole thing — 211 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — Instructions cross-agents

Projet

Frontend Flutter (Clean Architecture) + Backend Rust (Architecture Hexagonale).

Architecture

Frontend — Clean Architecture (Flutter)

frontend/lib/
├── core/                    # Shared: errors, network, DI setup
└── features/
    └── <feature_name>/
        ├── domain/          # Entities, Repository contracts (abstract), Use Cases
        ├── data/            # Models, DataSources, Repository implementations
        └── presentation/    # Bloc/Cubit, Pages, Widgets

Backend — Architecture Hexagonale (Rust)

backend/src/
├── domain/          # Traits (ports), entités, erreurs métier
├── application/     # Use cases, orchestration
└── infrastructure/  # Adaptateurs : HTTP/REST (axum), persistence (sea-orm)

Règles d'architecture — VIOLATIONS INTERDITES

INTERDIT : importer infrastructure/ ou data/ depuis domain/. Le domain ne dépend de RIEN.
INTERDIT : importer data/ depuis presentation/. La dépendance est presentation → domain ← data.
INTERDIT : mettre de la logique métier dans un Widget, une Page, ou un handler HTTP/REST. La logique métier vit dans domain/ et application/ uniquement.
INTERDIT : écrire un test qui dépend d'un service externe réel. Toujours mocker les ports/traits.
INTERDIT : utiliser unwrap() en code de production Rust. Réservé aux tests uniquement.

Conventions de code

Dart/Flutter

State management : flutter_bloc uniquement (pas de Provider direct, pas de setState pour la logique)
DI : get_it + injectable
Erreurs : Either<Failure, T> via dartz
Tests BDD : bdd_widget_test avec .feature Gherkin
Génération de code : build_runner (freezed, injectable, retrofit)

Read the full file on GitHub · 211 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 211 lines · 2,142 tokens per session scan A 5b0994cc7261

Subscribe to this mod's changes

devoxx-2026 AGENTS.md is an instructions file published in the GitHub repository b-fontaine/devoxx-2026 (5 stars, last pushed 6mo ago), licensed MIT. It adds 2,142 tokens to every session, about $0.0086 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

devoxx-2026 AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
devoxx-2026 AGENTS.mdb-fontaine/devoxx-2026	Instructions file	5	6mo ago	MIT	A	2,142	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

devoxx-2026: Instructions file for Codex