🧪 Devstral Lab

14 one-shot coding agents on Mistral La Plateforme — Devstral Small 2 + Codestral, zero-429 by design.

Code agentic · 1 task · 1 call · structured JSON · no LangChain loops.

Quick Start · Example · Architecture · vs Copilot · Bureau →

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📋 Example

Agent: Lab Impl (Devstral Small 2)

Input

Feature: export CSV des utilisateurs
Stack: FastAPI + React · auth JWT · PostgreSQL

Output

{
  "goal": "Endpoint export CSV utilisateurs authentifié",
  "steps": [
    {"order": 1, "task": "Route GET /api/users/export", "test": "401 sans token"},
    {"order": 2, "task": "StreamingResponse CSV", "test": "headers Content-Disposition"}
  ],
  "estimate_hours": 4,
  "risks": ["Gros volumes → pagination stream"]
}

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🎯 What is this?

Devstral Lab is Phase 1 of the Mistral showcase stack — a code-only vitrine for Devstral and Codestral.

Model	Agents	Rate gate
Devstral Small 2 (devstral-small-latest)	Review, Fix, Impl, Refactor, Test, Explain, Migrate, Secret	30s
Codestral (codestral-latest)	Commit, Regex, SQL, Docker, OpenAPI, API Design	20s

Phase 2 → Mistral Bureau (FR, Large, Pixtral vision)

📊 Benchmarks

Metric	Devstral Lab	Multi-agent IDE loop
Calls / task	1	5–30+
Output	JSON schema	Markdown + tools
Rate-safe	Per-model gate	429 spam
Typical latency	2–6s	15–120s

Reproduce: ./scripts/benchmark.sh (backend on :8788 + MISTRAL_API_KEY)

🏗 Architecture

flowchart LR
    A[Request] --> B[FastAPI]
    B --> C[Agent Registry]
    C --> D[Rate Gate per model]
    D --> E[api.mistral.ai]
    E --> F[JSON + latency_ms]

    style E fill:#ff700022,stroke:#ff7000,color:#ff7000
    style F fill:#22c55e22,stroke:#22c55e,color:#22c55e

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🚀 Quick Start

git clone https://github.com/anthonyoccelli33480-ctrl/devstral-lab.git
cd devstral-lab
cp .env.example .env   # MISTRAL_API_KEY from console.mistral.ai

make install
make backend   # http://127.0.0.1:8788
make frontend  # http://127.0.0.1:5175

macOS: double-click 🧪 Lancer Devstral Lab.command on Desktop.

🤖 Agent Catalog

Devstral (8) — agentic coding

Agent	One-liner
Lab Review	Diff → score + fixes
Lab Fix	Stack trace → patch
Lab Impl	Spec → implementation plan
Lab Refactor	Smell → clean code
Lab Explain	Code → explanation
Lab Test	Function → unit tests
Lab Migrate	Stack A → migration plan
Lab Secret	Leaked secrets scan

Codestral (6) — codegen

Lab Commit · Lab Regex · Lab SQL · Lab Docker · Lab OpenAPI · Lab API Design

Full list → docs/AGENTS.md

🆚 Why Devstral Lab?

	Devstral Lab	Copilot Agent / Cursor	CrewAI
Scope	One-shot JSON task	Multi-file agent loop	Autonomous crew
Models	Devstral + Codestral	Mixed	Any provider
429-safe	Built-in gates	Opaque	Your problem
Best for	Precise dev tasks	IDE integration	Long workflows

Complements Flash Agents (Cerebras speed) and Mistral Bureau (FR product).

🤖 Machine-readable

• PROJECT.json · metadata.jsonld

🔑 Keywords

devstral · codestral · mistral-ai · code-agentic · llm-agents · fastapi · structured-output · zero-429 · developer-tools

📜 License

MIT — LICENSE

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⭐ Phase 1 of the Mistral showcase — Bureau is Phase 2.

Built to show what Devstral feels like without framework tax.