Moderne has announced the launch of Moddy, the first-ever multi-repository AI agent designed to transform how developers understand and evolve large-scale codebases. Unlike traditional code assistants that operate within a single repository, Moddy is integrated into the multi-repository Moderne Platform, offering unprecedented visibility and precision for large-scale code management.

Moddy addresses critical software engineering challenges such as vendor migrations, security remediations, and dependency upgrades—tasks that require cross-repository analysis and modification. By leveraging the OpenRewrite Lossless Semantic Tree (LST), Moddy can analyze and modify vast codebases deterministically using thousands of OpenRewrite recipes.

“Moddy opens the door to billions of lines of code, empowering engineering teams to evolve software faster and with greater confidence,” said Olga Kundzich, CTO and Co-Founder of Moderne. “Developers can now see and act on entire codebases, not just the fraction open in their IDE.”

For example, a developer seeking to migrate legacy database usage to PostgreSQL can use Moddy to scan an entire organization’s codebase, identify SQL usage, and execute structured analysis. Moddy can cluster results, pinpoint proprietary SQL syntax needing updates, and apply deterministic changes or provide insights for manual updates.

Moddy integrates large language models (LLMs) with Moderne’s deterministic systems, allowing LLMs to interpret human requests while deterministic tools deliver accurate, actionable data. This hybrid approach, enabled by the rise of LLM tool-function calling in late 2024, allows developers to confidently execute large-scale code changes.

Additionally, Moddy builds knowledge graphs through LLM and recipe interaction, enabling a deep understanding of business logic beyond technical code structure. For instance, it can answer questions about specific business processes like payment processing locations within a company’s codebase.

Moderne provides flexibility in LLM choices with Moddy, supporting multiple AI models, including BYOM (Bring Your Own Model). Testing across various AI providers has shown that when enabled with deterministic tools, all models perform well and yield reliable results.

By extending beyond the limitations of IDE-based code assistants, Moddy revolutionizes developer productivity, making it easier to maintain, modernize, and secure complex software environments across multiple repositories.