Coding agent · Harness / Desktop / Web / CLI

DeepSeek Harness

DeepSeek Harness is a Harness / Desktop / Web / CLI in the 2026 agents.dancingteeth catalog. Developers who want DeepSeek’s official MIT harness — Cordis plugin composition, a traceable session log, and a local desktop/web/headless coding agent — instead of a closed Claude Code/Codex loop.

Last updated

Verified

Best for

Developers who want DeepSeek’s official MIT harness — Cordis plugin composition, a traceable session log, and a local desktop/web/headless coding agent — instead of a closed Claude Code/Codex loop.

Skip if

You need a stable daily IDE/CLI with hosted cloud agents, you refuse a PRC-hosted default API and preview breakage, or you wanted Reasonix (DeepSeek-native CLI) / V4-Pro inference rather than the harness.

Who it fits

  • Developers who want DeepSeek’s official MIT harness — Cordis plugin composition, a traceable session log, and a local desktop/web/headless coding agent — instead of a closed Claude Code/Codex loop.
  • People who prefer a dedicated desktop coding surface
  • Builders who start in the browser without a local IDE setup
  • Terminal-first engineers who live in the shell and git
Experimental

Pros

Official DeepSeek MIT harness on Cordis — every capability (model, tools, skills, session log, sandbox, loop, UI) is a swappable plugin; macOS (Apple Silicon) and Windows Desktop app (bundles the `dsh` command and plugin manager; tasks keep running with the window closed) plus local Web UI (`npx @deepseek-ai/dsh web`) and headless/ACP/JSON-RPC; Standard/Code/Minimal/Creator modes; append-only session log for resume/fork/replay; first-party AGENTS.md and skills; Claude Code/Codex hook bridges.

Cons

Developer preview with promised breaking changes and no on-disk format compatibility; releases are still rc/alpha (0.2.x), Desktop included; no Intel Mac Desktop build; default path is DeepSeek API not OpenCode-class multi-lab BYOK; no hosted cloud agents or GitHub PR product vs Claude Code/Codex; PRC vendor/API residency; V4 peak/off-peak price hike (from 2026-08-16) hits default inference.

Facts

Locality:
Hybrid (local + cloud)
Surfaces:
Desktop, Web, CLI
Maturity:
Experimental
BYOK:
Bring your own API key
Open source:
Source available
Free tier:
Free option available
MCP:
Model Context Protocol support
Cloud agents:
Remote agent execution
Verified:
Oct 2026

Agent standards & memory

AGENTS.md: Full SupportSKILL.md: SupportedRules / memory: Append-only session event log (fork/resume/replay); cordis.yml / profile patches; skills catalog; plan/goals/subagent state; optional MCP client (no server enabled by default).100% Free (Open-source, MIT); model cost via DEEPSEEK_API_KEY or plugin adapters.

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Frequently asked questions

What is DeepSeek Harness?

DeepSeek Harness is a Harness / Desktop / Web / CLI covered in the agents.dancingteeth 2026 catalog. Official DeepSeek MIT harness on Cordis — every capability (model, tools, skills, session log, sandbox, loop, UI) is a swappable plugin; macOS (Apple Silicon) and Windows Desktop app (bundles the `dsh` command and plugin manager; tasks keep running with the window closed) plus local Web UI (`npx @deepseek-ai/dsh web`) and headless/ACP/JSON-RPC; Standard/Code/Minimal/Creator modes; append-only session log for resume/fork/replay; first-party AGENTS.

Who is DeepSeek Harness best for?

Developers who want DeepSeek’s official MIT harness — Cordis plugin composition, a traceable session log, and a local desktop/web/headless coding agent — instead of a closed Claude Code/Codex loop.

When should I skip DeepSeek Harness?

You need a stable daily IDE/CLI with hosted cloud agents, you refuse a PRC-hosted default API and preview breakage, or you wanted Reasonix (DeepSeek-native CLI) / V4-Pro inference rather than the harness.

What are the main trade-offs of DeepSeek Harness?

Pros: Official DeepSeek MIT harness on Cordis — every capability (model, tools, skills, session log, sandbox, loop, UI) is a swappable plugin; macOS (Apple Silicon) and Windows Desktop app (bundles the `dsh` command and plugin manager; tasks keep running with the window closed) plus local Web UI (`npx @deepseek-ai/dsh web`) and headless/ACP/JSON-RPC; Standard/Code/Minimal/Creator modes; append-only session log for resume/fork/replay; first-party AGENTS. Cons: Developer preview with promised breaking changes and no on-disk format compatibility; releases are still rc/alpha (0.

Does DeepSeek Harness support AGENTS.md, SKILL.md, or MCP?

This card lists AGENTS.md as Full Support, SKILL.md as Supported, and rules/memory as Append-only session event log (fork/resume/replay); cordis.yml / profile patches; skills catalog; plan/goals/subagent state; optional MCP client (no server enabled by default).. Free options: 100% Free (Open-source, MIT); model cost via DEEPSEEK_API_KEY or plugin adapters..

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