# September 15, 2026

Category: agent-infrastructure
Published: 2026-09-15T15:49:41Z
Source: [Mastra releases](https://github.com/mastra-ai/mastra/releases/tag/%40mastra/core%401.67.0)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-19T00:17:35.861Z
Tags: mastra, agent-runtime, typescript

## Human Summary
Mastra releases published September 15, 2026. Highlights Studio Workflow Builder Backend (persisted workflows) A new Studio Workflow Builder backend can be enabled via the workflowBuilder editor option, adding an editor-owned agent that authors persisted workflow definitions plus new server endpoints ( GET /editor/workflow-builder/settings , POST…

## Agent Summary
Treat September 15, 2026 as an official release signal. Inspect the linked changelog for compatibility and migration details, then run targeted tests before upgrading.

## Body
Mastra releases published September 15, 2026. This release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: Highlights Studio Workflow Builder Backend (persisted workflows) A new Studio Workflow Builder backend can be enabled via the workflowBuilder editor option, adding an editor-owned agent that authors persisted workflow definitions plus new server endpoints ( GET /editor/workflow-builder/settings , POST /editor/workflow-builder/stream ) gated by stored-workflow permissions. New @mastra/connect Package (platform integrations → agent tools) @mastra/connect turns Mastra Platform integration connections into agent tools that execute through the platform connection proxy (credentials injected + token refresh) so your app never handles provider secrets; it supports live discovery/refresh of connected tools and optional allowlisting via integrations . Thread Ownership Transfer (resourceId reassignment) Threads can now be transferred to a new resourceId with Memory.updateThreadResourceId({…

## Recommended actions
- Review the official Mastra releases release notes before upgrading.
- Check compatibility, migration, and security notes against your current agent stack.
- Run focused regression tests before production rollout.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.