DeepSeek Harness DeepSeek Harness
DeepSeek Harness (dsh) is an open-source, plugin-based agent runtime that provides the infrastructure—including tools, sessions, sandboxes, and loops—required to transform raw language models into functional coding agents. Built on the Cordis meta-framework, it treats every component as a swappable plugin, allowing developers to customize or replace any part of the agent's environment without forking the source code.
Recent releases have introduced native image recognition, concurrent web search queries, optimized SQLite backend performance, and the ability to package Claude Code and Codex as installable plugin bundles.
As of
- Everything-is-a-plugin architecture for models, tools, sandboxes, and UI
- Append-only session logs for full trajectory inspection, replay, and forking
- Multi-mode operation (Standard, Code/PTC, Minimal, and Creator presets)
- Model-agnostic with support for DeepSeek, Anthropic, OpenAI, and local/OpenAI-compatible endpoints
- Built-in sub-agent integration for Claude Code and Codex
Developers who need to build custom agent platforms, conduct model evaluations in consistent environments, or require deep observability into agent reasoning and tool usage.
Production-critical, customer-facing workflows requiring stable APIs, enterprise SLAs, or deterministic results, as the tool is in a rapidly evolving developer preview state.
The harness itself is free and MIT-licensed. Users only pay for the metered API usage of the specific model(s) they connect to the harness.
A powerful, highly transparent, and composable agent runtime that serves as an excellent 'scheduling layer' for experimentation, though its current developer-preview status and frequent breaking changes make it unsuitable for production environments.
Is DeepSeek Harness free?
Yes - DeepSeek Harness is Open Source. The harness itself is free and MIT-licensed. Users only pay for the metered API usage of the specific model(s) they connect to the harness.
What is DeepSeek Harness best for?
Developers who need to build custom agent platforms, conduct model evaluations in consistent environments, or require deep observability into agent reasoning and tool usage.
Who makes DeepSeek Harness?
DeepSeek Harness is developed by DeepSeek AI. It is listed in the Terminal & CLI Agents category on ai.dosa.dev.
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