Mastra

MastraSince 2026-01

Mastra is an open-source, TypeScript-first framework designed for building, testing, and deploying production-grade AI agents and autonomous workflows. It provides native support for multi-agent graph orchestration, persistent state management, semantic memory, and automated evaluation metrics without requiring complex Python bridges.

Built for modern Node.js and Next.js developer environments, Mastra unifies LLM routing, tool execution, and vector retrieval into a single composable SDK. Its engine features built-in observability for tracing agent decision trees, deterministic schema validation via Zod, and instant deployment pipelines for serverless infrastructure.

Cosine GenieSince 2024-08

Cosine Genie is a next-generation autonomous software engineering agent built to tackle complex software bugs, refactors, and feature requests. Operating with deep semantic understanding of massive codebases, Genie analyzes repository architectures, creates comprehensive execution plans, and generates multi-file diffs that pass existing continuous integration test suites. Designed to bridge the gap between AI code completion and full software development lifecycle automation, Genie mimics human engineering workflows by navigating dependency graphs, testing assumptions in sandboxed environments, and autonomously self-correcting logic errors before opening pull requests.

Genie is powered by Cosine's proprietary fine-tuned reasoning models and multi-agent orchestration framework, benchmarked at top-tier performance on the industry-standard SWE-bench. The system integrates directly with GitHub and GitLab, indexing abstract syntax trees (ASTs), commit histories, and documentation to maintain contextual awareness. Its sandboxed runtime spins up localized build containers to execute unit tests, compile artifacts, and measure regression risks in real time. Engineering teams use Genie to triage backlogs, automate dependency upgrades, and accelerate code reviews with verified pull request generation.