Second

As AI code generators go, Second is built around migrations and upgrades rather than open-ended chat.

Second is an AI developer bot that generates new web applications, adds full-stack features to existing ones, and automates codebase migrations, including dependency resolution, build system updates and test updates.

Each Second agent runs on a purpose-built module made for one specific kind of migration.

The makers say this removes prompt drift, a common complaint with free-form prompting on large refactors.

The agents are described as experts in current versions of modern frameworks and libraries.

Second hands its work to human developers as pull requests on GitHub, Bitbucket or GitLab, so changes show up as normal code review.

Behind the scenes it can run on OpenAI, Azure OpenAI, AWS Bedrock or open-source models.

That matters if your company restricts which model providers its developers may use.