DeepSeek Harness

What it is

DeepSeek's own open-source agent harness ("dsh"): an everything-is-a-plugin agent with a local Web UI that reads and edits workspace files, runs commands, delegates work and keeps a plan.

GitHub repo ↗ · deepseek-harness.github.io/deepseek-harness ↗ · @deepseek_ai ↗

X account: DeepSeek's verified account (already in our monitored X accounts); the harness has no account of its own.

Install

• npx @deepseek-ai/dsh web
• git clone https://github.com/deepseek-ai/deepseek-harness.git && pnpm install && pnpm run build && pnpm dsh web

raw.githubusercontent.com/deepseek-ai/deepseek-harness/HEAD/README.md ↗ · checked Oct 25, 2026

Models

DeepSeek API key by default (Settings → Models); other providers and custom OpenAI-compatible endpoints per the model configuration guide.

raw.githubusercontent.com/deepseek-ai/deepseek-harness/HEAD/docs/user/guide/index.md ↗ · checked Oct 25, 2026

Benchmarks

• 46 Artificial Analysis Coding Agent Index v2.0 · with DeepSeek V4.1 Flash 1017 (max) · 11th of the 14 runs shown artificialanalysis.ai/agents/coding ↗ · checked Oct 25, 2026 · Composite of FrontierCode v1.1, Terminal-Bench 4.0 and SWE-Atlas-QnA-AA; no board date on the page.

Recent updates

Dated changes from DeepSeek Harness's releases and changelog and its official X account (@deepseek_ai), newest first. Posts on X are marked until docs or a release say the same. Nothing is removed. Checked Oct 25, 2026.

All DeepSeek Harness releases so far are pre-releases. @deepseek_ai posted nothing about the harness since Sep 25 (checked 2026-10-25).

Cost

Free and open source (MIT); you pay your model provider (DeepSeek API by default).

Unverified: no hosted plan or price listed

raw.githubusercontent.com/deepseek-ai/deepseek-harness/HEAD/README.md ↗ · checked Oct 25, 2026

Features

• Everything-is-a-plugin architecture built on Cordis raw.githubusercontent.com/deepseek-ai/deepseek-harness/HEAD/README.md ↗
• Web UI with workspaces; asks before operations that need approval under the active permission policy raw.githubusercontent.com/deepseek-ai/deepseek-harness/HEAD/docs/user/guide/index.md ↗
• Python SDK and other CLI modes raw.githubusercontent.com/deepseek-ai/deepseek-harness/HEAD/docs/user/guide/index.md ↗
• Developer preview: the README warns of compatibility-breaking changes and asks you to read its safety notice first raw.githubusercontent.com/deepseek-ai/deepseek-harness/HEAD/README.md ↗

Use cases

Added in R34 (2026-10-25); use cases not collected yet.

Complaints and issues

None found.

FAQ

History

Nothing is erased: earlier values stay here, from our dated checks and the release timeline.

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Releases seen: dsh-v0.2.1-rc.3 (Oct 23, 2026)