Developer builds mobile interface for AI agents, argues phones are their natural home

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A developer has released DeepSeek Phone Harness, an open-source mobile browser interface that lets users control AI agents running on their computers remotely via 4G/5G or Tailscale. The project, built as a single-file frontend with around 4,000 lines and zero npm dependencies, supports streaming output, tool approvals, model switching, and file management. The developer argues that current agent interfaces — terminal or web-based — still require users to sit at a computer, undermining the core promise of agents doing work autonomously. Mobile interaction, they contend, shifts the dynamic from 'accompanying' an agent to 'dispatching' it and checking back for results. The release coincides with DeepSeek Harness going open source, and is available on GitHub under the MIT license.

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