New AWS Ecosystem Tooling from Oproto: LambdaOpenApi

While FluentDynamoDB remains in a hackathon code freeze, we thought we'd bring a small early holiday gift to the community by open-sourcing some internal tooling we've already built for our SaaS platform.

Introducing LambdaOpenApi.

🚧 Project Status Update – Temporary Code Freeze FluentDynamoDB is currently in a temporary code freeze due to our Kiroween 2025 hackathon submission. During this period, the public repository will not receive updates, and new features will be released after judging concludes in early 2026. We're still actively engaged with the community, and we're preparing a February release that will include important fixes, improvements, and new capabilities.

As we continue through the Kiroween Hackathon code freeze, we’ve been using the downtime to polish some of the internal tools that power our day-to-day development. Today, we’re excited to open-source one of those utilities: LambdaOpenApi.

LambdaOpenApi is a Roslyn source generator that produces compile-time OpenAPI documentation for AWS Lambda applications built with the Lambda Annotations framework. It eliminates the manual drift-prone OpenAPI step and ensures your contracts stay accurate, fast, and cost-free to generate.

We originally built this for our own SaaS platform work, but it quickly became clear it could help other teams working with Lambda Annotations. As a result, we're releasing it publicly now - ahead of February, when the code freeze lifts and our main libraries resume active development.

If you’re interested in improving your Lambda Annotations workflow, or you want API documentation handled automatically, check it out here:

👉 GitHub: https://github.com/Oproto/lambda-openapi

👉 NuGet: Oproto.Lambda.OpenApi

This is just one of several internal tools we plan to release. Even while the main FluentDynamoDB repo remains frozen, the ecosystem continues to grow—and we’re excited to share more soon.

Stay tuned, and happy building!