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The bash tool already declares the `card: 'terminal'` render intent for both its call and its result, and host/connection/runtime already deliver it to the browser as callView/resultView. The Web client ignored it: rows derived from raw args, and the details panel flattened every tool's content into one soft-wrapping `<pre>`. Column-aligned output folded into a paragraph and a long listing stretched the panel without bound. `TerminalBlock` (ui-primitives) renders a command as a terminal surface: a shortened-cwd prompt line, output at `white-space: pre` in a horizontally scrolling box, a head/tail height cap with an expand control, an exit-code/signal status pill, and a copy control for the raw output. ANSI SGR runs are parsed with `anser` and resolved onto `--dsw-*` theme tokens, with literal rgb kept for values the design system has no token for. Geometry and fonts mirror CodeBlock; the clipboard write both need moved into a package-internal `clipboard.ts`. Both Web render sites for a bash call consume the intent through one derivation (`terminal-card-model.ts`), so they cannot disagree about a command, its cwd, or its exit status: the keyed BashRow carries the card resident below its summary row, and the render-site fallback row keeps it behind its existing expand control. Rows cap at 8 lines against the panel's 16. Inline output in the chat row reverses this package's stated no-inline-output convention, on the owner's explicit decision; the Agent Note records the reversal and its bound. Tests: TerminalBlock/ansi/clipboard unit specs, ui-conversation wiring specs at every render site, a built-client-graph snapshot covering both chat-row shapes, and a real-browser e2e asserting the no-wrap layout and the page's own Clipboard API.
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 keeps every checkout under ~/.dsh/source: the master clone at ~/.dsh/source/master and each install's staging checkout as a git worktree ~/.dsh/source/staging-<timestamp>. The stable symlink ~/.dsh/source/current points at the active staging worktree, and dsh in ~/.local/bin links to current/bin/dsh, so an upgrade repoints one symlink and the dsh on PATH never moves. Re-running the command adds a fresh staging worktree from an updated master and repoints current at it. 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. Resolve the running checkout from the dsh launcher so the command holds regardless of which staging worktree is current (the launcher resolves through the stable current symlink):
dsh_bin=$(cd "$(dirname "$(command -v dsh)")" && pwd -P)/$(basename "$(command -v dsh)")
while [ -L "$dsh_bin" ]; do
link=$(readlink "$dsh_bin")
case $link in /*) dsh_bin=$link ;; *) dsh_bin=$(cd "$(dirname "$dsh_bin")" && cd "$(dirname "$link")" && pwd -P)/$(basename "$link") ;; esac
done
dsh_dir=$(cd "$(dirname "$dsh_bin")/.." && pwd -P)
pnpm --dir "$dsh_dir" run build && pnpm --dir "$dsh_dir" 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.