cf2b9e211d
- api: resolve a relative workspace cwd to absolute before the handshake — the child spawns relative to the parent cwd, but the wire cwd is resolved again inside the child, so a relative value double-resolved (worker -> worker/worker). - api: make the documented handshake retry real — HarnessClient.close() is permanent, so a failed initialize now reaps the runtime and swaps in a fresh client; DeepSeekHarness.close() is terminal and stops the respawns. - api: validate session.event envelopes, assistant/message content, and session.finished reasons at the wire boundary — a malformed runtime surfaces as SdkProtocolError instead of type-invalid TurnResult data or a TypeError out of finalResponse. - client: a throwing subscribe() filter fails and detaches only its own subscription (normalized to Error); sibling fan-out and the transport read loop are undisturbed. - client: NotificationSubscription.close() drops its queued notifications, matching its documented contract; runtime-death fail() still leaves already-delivered items drainable. - client: subscribe() after close()/runtime death returns a born-failed subscription so next() rejects instead of parking forever. - client/transport: bounded requests abandon via AbortSignal — the transport drops the pending entry at timeout, so repeated bounded calls against a hung method retain no per-call state. One test per finding; per-file coverage stays 100% on both packages.
DeepSeek Harness
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DeepSeek Harness (dsh) is an open-source coding agent built on the DeepSeek Harness SDK.
It uses an architecture where everything is a plugin.
Install
Install dsh with one command:
curl -fsSL https://raw.githubusercontent.com/deepseek-harness/deepseek-harness/master/scripts/install.sh | sh
The installer requires git and Node ^22.19 || >=24, offers to install pnpm when it is missing, and prompts for a DeepSeek API key.
The installer clones DeepSeek Harness to ~/.dsh/source, links dsh into ~/.local/bin, and launches it. Re-running the command updates the checkout. See scripts/install.sh for alternate install locations and other options.
Use DeepSeek Harness
Web UI
For the recommended local interface, build the frontend after installation and after each update, then start the Web UI:
pnpm --dir ~/.dsh/source run build && pnpm --dir ~/.dsh/source run build:web
dsh web
The Web UI is served at http://127.0.0.1:3080 by default.
TUI
Start the full-screen terminal interface:
dsh
Headless
Run one task, print the final answer, and exit:
dsh -p "summarize this workspace"
Why DeepSeek Harness
Built-in capabilities cover file reading, editing, and search; shell execution; reusable skills; task tracking; subagents and workflows; persistent sessions; and context compaction. The TUI also includes Plan Mode.
- Everything is a plugin. Models, tools, policies, storage, context management, and interfaces are composable Cordis plugins, so deployments can extend or replace behavior without forking the agent loop. See the architecture for the underlying design.
- Code Mode (opt-in). It exposes a
run_codetool and a generated TypeScript SDK; only program output re-enters model context. See Code Mode. - Self-referential Cordis tools are opt-in. They let the agent inspect its live runtime and mount or unmount plugins while it runs. See the Cordis tools.
Community
Follow DeepSeek Harness on Twitter for project updates.
Development
pnpm install
pnpm run test:coverage
Start with the development guide and read the architecture before changing packages.
For agents, follow AGENTS.md.
DeepSeek Harness is currently pre-release.