Mastra
mastra-ai/mastra
The TypeScript framework for production agents.
Mastra is a full TS-native agent framework — workflows, tool calling, RAG, evals and a dev playground — that has become the default choice for JavaScript teams building agent backends.
Behind the project
In the news
HarnessTax: harness choice swings agent cost more than model choice
Arena.ai's HarnessTax study tests 21 model–harness combinations across Claude Code, Codex CLI and Pi, finding harness choice can significantly change cost even at similar task success rates. Weeks earlier, SWE-bench Pro analysis showed swapping harnesses moved pass@1 more than model upgrades (23%→52% on GLM-5.2) — and that harness rankings barely transfer across models.
ClickHouse acquires Langfuse
ClickHouse acquires the open-source LLM observability platform Langfuse as part of its $400M Series D at a $15B valuation — the first big consolidation in agent observability. The open-source core remains maintained; the deal signals that agent tracing is becoming a database-scale problem.
Microsoft Agent Framework unifies AutoGen and Semantic Kernel
Microsoft announces the public preview of its Agent Framework, converging AutoGen's multi-agent research lineage with Semantic Kernel's enterprise abstractions — a major consolidation in orchestration frameworks.
Google open-sources the Agent Development Kit
Google launches ADK, a modular open-source framework for building agents with Gemini integration, multi-agent hierarchies and A2A support — Google's major entry into the framework wars.
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