# Mastra Core Framework (@mastra/core) - AgentBreakWatch Reference

> TL;DR Verdict: Mastra Core Framework (`@mastra/core`) is currently at v1.79.0 on NPM (published 2026-10-21), with a 90-day Stability Score of 70/100 (C+) and HIGH schema drift risk across 63 releases in the last 90 days. Rapid v1.x cadence updates Agent memory thread scoping, createTool inputSchema validation, and workflow step execution context.

## Live Telemetry Metadata
- Canonical Page: https://agentbreakwatch.vercel.app/p/mastra-core
- Category Hub: https://agentbreakwatch.vercel.app/c/agent-sdks (AI Agent SDKs & Frameworks Breaking-Change Index)
- Package Name: `@mastra/core`
- Registry: NPM (https://www.npmjs.com/package/@mastra/core)
- GitHub Repository: https://github.com/mastra-ai/mastra
- Vendor: Mastra
- Latest Live Version: v1.79.0
- Published Date: 2026-10-21T11:41:43.495Z
- 90-Day Release Count: 63
- Direct Dependencies: 30
- License: Apache-2.0
- Stability Score: 70/100 (Grade C+)
- Schema Drift Risk: HIGH
- Recommended Exact Pin Command: `npm install @mastra/core@1.79.0`
- Watched Symbols / MCP Tools: Mastra, Agent, createTool, createWorkflow
- Snapshot Timestamp: 2026-10-24T12:11:27.697Z

## Breaking Change & Schema Drift Summary
Rapid v1.x cadence updates Agent memory thread scoping, createTool inputSchema validation, and workflow step execution context.

## Migration Diff: Before (Deprecated / Unpinned Pattern)
```
const agent = new Agent({ name: "helper", llm: { provider: "OPEN_AI", name: "gpt-4o" } });
```

## Migration Diff: After (Verified v1.79.0 Pattern)
```
const agent = new Agent({ id: "helper", name: "helper", model: openai("gpt-5") });
```

## Recent Verified Releases
- v0.0.0-org-metrics-2-20261023192557 (published 2026-10-23) [LATEST]
- v0.0.0-doctor-retest-20261023184401 (published 2026-10-23)
- v0.0.0-org-metrics-20261023150314 (published 2026-10-23)
- v0.0.0-ui-lint-export-20261023090103 (published 2026-10-23)
- v0.0.0-ui-lint-export-20261023081211 (published 2026-10-23)
- v0.0.0-ui-lint-export-20261023065315 (published 2026-10-23)