# Create Csharp Minimal API > Create or extend the C# Minimal API migration project. Use for scaffolding Program.cs, DTOs, services, weather.json loading, and the first safe implementation steps. Use when this capability is needed. - Skill: `tomevault-io/create-csharp-minimal-api` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/create-csharp-minimal-api` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/create-csharp-minimal-api/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: AI & ML - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/create-csharp-minimal-api --- # Create C# Minimal API ## When to Use - When initializing the C# migration project - When adding the next C# endpoint - When introducing DTOs or services to support parity - When wiring weather.json data into the C# application ## Procedure 1. Confirm the specific endpoint or scope to implement. 2. Read the Python source and related tests first. 3. Review the checklist in [project-checklist](./assets/project-checklist.md). 4. Generate or edit only the minimum required C# files. 5. Stop after a small milestone and suggest the narrowest validation step. ## Rules - Use ASP.NET Core Minimal APIs. - Keep changes incremental and reviewable. - Prefer `System.Text.Json` for JSON handling. - Avoid broad rewrites when only one endpoint is being added. - Preserve response behavior unless the task explicitly allows change. ## Output - Files created or edited - Scope implemented - Remaining TODOs - Recommended validation command --- > Source: [microsoft/aitour26-WRK541-real-world-code-migration-with-github-copilot-agent-mode](https://github.com/microsoft/aitour26-WRK541-real-world-code-migration-with-github-copilot-agent-mode) — distributed by [TomeVault](https://tomevault.io).