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2a51ef85fb
agent-loop lifecycle: dispose drains machine.done to true quiescence. cancel()'s own running-to-idle transition can legitimately re-enter through an automation listener (goal-session's idle drive runs synchronously to its first await) and replace done with a fresh admission after the single capture; teardown now re-cancels and re-awaits until the slot stabilizes, so the scope never unwinds under a live run. tools: a nested concludeTurn() stages on its own execution and promotes to the enclosing composite only on the call's authoritative successful verdict. A post-execute policy that converts the nested success into an error no longer lets a recovering composite stop the turn on a failed terminal operation (the Code Mode structured-output shape). goal-session: the driver owns its round durability barrier again. The loop's persistence is eager write-behind with no turn-end flush, so the old post-turn agent/error signal for flush failures never fires; a settled round now sets needsCheckpoint and re-enters drive, flushing before the next reservation and disarming on failure instead of queueing an autonomous round on state that was never persisted.
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.