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@mastra/core@1.76.0 @mastra/core@1.77.0

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mastra-ai/mastraOct 13, 2026 → Oct 14, 20261 day between releases

What's New

Expanded run fencing across storage backends and new Factory Sandbox Provider contracts.

Breaking Changes

  • Factory projects now require provider-instance sandboxes in config.
  • Internal workflow HTTP routes no longer support starting/resuming workflows.
  • AgentController session behavior changed with new suspension APIs and deprecated fields.
  • Playground UI Dialog and AlertDialog props removed in favor of controlled open/onOpenChange.
  • Compare-experiments APIs deprecate experimentIdA/B in favor of experimentIds.

New Features

  • New Factory Sandbox Provider implementations for Docker, E2B, and Platform.
  • Environment builds and multi-repository sessions support.
  • File attachments for steer and followUp methods.
  • Span linking for cross-trace correlation.
  • Pricing field support in gateway provider configs.

Improvements

  • Run fencing now supported across more storage backends (Cloudflare, Convex, etc.).
  • Observational Memory concurrency hardened against overlapping operations.
  • Authenticated message authors supported in AgentController sessions.
  • Span links added for cross-trace correlation.

Bug Fixes

  • Observational Memory concurrency issues fixed.
  • Internal workflow routing errors resolved (404).

Upgrade Notes

Update MastraFactoryConfig to include the new sandbox property for provider instances. Migrate internal workflow invocations to use agent routes instead of HTTP routes. Update Playground UI components to use controlled open and onOpenChange props.

The Two Releases

@mastra/core@1.76.0

October 11, 2026

Oct 13, 2026· 9 days ago

This major release introduces robust crash recovery mechanisms for durable agents with run ownership and fencing, atomic working memory merges for PostgreSQL, and enhanced file-handling resilience with sandbox workflows. It also introduces Observational Memory auto-model selection and richer trace search capabilities.

Full release notes
@mastra/core@1.77.0

October 14, 2026

Oct 14, 2026· 8 days ago

This release introduces Factory Sandbox Provider contracts with new implementations for Docker and E2B, along with environment builds and multi-repository sessions. It significantly improves durable agent safety through run fencing across multiple storage backends and enhances observational memory concurrency.

Full release notes