Mistral Prompt for Creating Software Architecture

Mistral, the leading French AI model, excels in software architecture design thanks to its fine understanding of design patterns and technical constraints. Whether you are starting a new project or restructuring an existing application, Mistral can help you define a solid, scalable, and maintainable architecture. By providing a well-structured prompt, you will receive detailed recommendations on architectural pattern choices, separation of concerns, suitable technologies, and inter-service communication strategies. The AI analyzes your business, technical, and organizational constraints to propose a coherent architecture that anticipates future evolutions. This guide provides optimized prompts to get the best out of Mistral in creating software architectures, from modular monoliths to microservices, including event-driven and hexagonal architectures. Each prompt is designed to produce deliverables immediately usable by your development team.

The prompt

Mistral

Act as a senior software architect with 15 years of experience. I am developing a project with the following characteristics:

Business domain: [describe your domain, e.g., B2B e-commerce platform]
Expected users: [number and type of users]
Technical constraints: [existing stack, hosting, budget]
Non-functional requirements: [performance, availability, security]

Design a complete software architecture following this structure:

Overview: Text diagram of the overall architecture with main components and their interactions
Architectural pattern: Justify the pattern choice (hexagonal, microservices, modular monolith, CQRS, event-driven...) based on constraints
Module/service breakdown: List each module with its responsibilities, public interfaces, and dependencies
Application layers: Detail the separation of layers (presentation, application, domain, infrastructure) with dependency rules
Data strategy: Simplified data model, database choice, cache and synchronization strategy
Inter-service communication: Protocols (REST, gRPC, events), resilience patterns (circuit breaker, retry, fallback)
Cross-cutting concerns: Authentication, logging, monitoring, CI/CD, error handling
Evolution plan: How this architecture can evolve over 12-24 months

For each decision, indicate the alternatives considered and why they were discarded. Provide code examples for key interfaces.

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Why it works

This prompt works because it assigns a precise expert role to Mistral, activating its most advanced knowledge in software architecture. The 8-section structure forces an exhaustive and organized response, avoiding superficial answers. The request for alternative justifications pushes the model to comparative reasoning, producing more nuanced and contextualized recommendations.

Expected result

You will get a complete architecture document including a text diagram of the architecture, details of each component with its responsibilities and interfaces, and justified technology recommendations. The result includes code examples for critical interfaces and an evolution plan, all directly usable as a basis for an ADR (Architecture Decision Record) or a technical specification document.

Variants by level

FAQ

Can Mistral generate usable architecture diagrams?

Mistral does not directly generate images, but it can produce diagrams in textual notation (Mermaid, PlantUML, ASCII art) that you can then convert into visual diagrams. Explicitly ask it for the desired format, for example: 'Generate the diagram in Mermaid syntax.' You can then paste the code into a tool like mermaid.live or embed it directly into your Markdown documentation. For C4 views, Structurizr DSL is also an effective output format.

How to adapt the prompt if my project already uses an imposed tech stack?

Explicitly list the technological constraints in the dedicated section of the prompt: frameworks, languages, databases, cloud services, and tools already in place. Add a line 'You must work with these technologies; do not propose replacing them unless critical.' Mistral will then adapt its architectural recommendations to the existing technologies rather than starting from scratch. If some components are negotiable, specify this to get relevant alternatives.

Which version of Mistral is recommended for software architecture design?

For software architecture design, prefer Mistral Large, which offers the most advanced reasoning capabilities, essential for analyzing complex constraints and producing coherent recommendations. Mistral Medium is suitable for simple to intermediate architectures. Avoid Mistral Small for this type of task because the depth of reasoning needed to compare architectural patterns and anticipate long-term impacts requires a more powerful model. If using the Le Chat platform, select the Large model in the settings.

How to use this prompt

Copy the prompt with the button above.
Paste it into ChatGPT, Claude or your favorite AI assistant.
Replace the bracketed variables with your details, then refine the result.

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