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Posts tagged releases
v0.13.0
B4.run 0.13: A sandbox per thread
Learn what 0.13 adds for threads that need their own environment: per-thread images and permissions, staged workspaces and HTTP reads.
Sep 30, 2026
v0.12.0B4.run 0.9 to 0.12: The answer the user sees
Learn what 0.9 through 0.12 changed about the final answer: response schemas, an after hook, returnDirect tools and streamed tool arguments.
Sep 23, 2026
v0.8.21B4.run 0.8: The framework around the agent
Learn what 0.5 through 0.8 added around the agent: evals, tool permissions, sandboxes, delegation, typed memory, AG-UI clients and production builds.
Aug 9, 2026
v0.4.0B4.run 0.4: Start with an agent test
Learn how the offline agent test added to the starter in 0.4 works, and what a scripted model response can verify.
Jun 2, 2026
Build your own agent.
Scaffold a project and walk through every file it gives you.