# The Agent Harness Is Becoming Infrastructure, With DeepSeek and Earendil Both Shipping Open Runtimes

DeepSeek's MIT-licensed harness treats models, tools and sandboxes as swappable plugins, while Earendil's Pi reached a stable 1.0 with native Model Context Protocol support and a durable runtime for long-lived agents.

- Published: 2026-10-02T06:31:19.109Z
- Canonical: https://polylog.news/ai/2026-10-02/the-agent-harness-is-becoming-infrastructure-with-deepseek-a
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [DeepSeek](https://www.deepseek.com/en/harness/), [Earendil](https://earendil.com/posts/pi-1-0/)

Two new releases are shifting the agent runtime away from being something only model vendors supply. DeepSeek Harness is an MIT-licensed execution runtime built on the Cordis meta-framework around a single principle, that everything is a pl…

This story is for subscribers. Read it in full at https://polylog.news/ai/2026-10-02/the-agent-harness-is-becoming-infrastructure-with-deepseek-a (subscription information: https://polylog.news/pricing).