# Mastra launches Custom Harness Program with forward-deployed engineers co-building agent systems

> Original title: Introducing the Mastra Custom Harness Program

- Source: Mastra Blog
- Published: 2026-11-05T05:00:00.000Z
- Bad Influence: https://badinfluence.news/items/nuiksewgcyxv63hg6huhaun86
- Original: https://mastra.ai/blog/announcing-custom-harness-program

## Summary

Mastra launches the Custom Harness Program, in which its forward-deployed engineers embed with customer teams to co-build agent harnesses tailored to their goals. The program builds on Mastra, which is open source, so customers can swap models and avoid vendor lock-in. Workday says it moved from Amazon Bedrock Agents to Mastra in 31 days, cutting 3,000 lines of code and lowering vector-storage costs 98%.