109b469a7e
Two review findings on the turndown swap, both verified empirically: - Unclosed-tag nesting makes the synchronous turndown/domino walk superlinear (measured: depth 512 ~0.15s, 2k ~2s, 20k ~5s), during which the cooperative fetchTimeoutMs timer cannot fire. renderBody now preflights nesting depth with a linear tag scan and passes bodies past 512 levels through raw; the try/catch stays for markup the scan cannot see (comment-hidden tags), simulated in tests via a converter throw. - Markdown escaping can expand converted HTML ~2x (100k underscores render as 200k chars), so provider body caps no longer bounded the model-visible result. formatFetchOutput now caps the complete output (header + body + footer) under new fetchMaxOutputChars config (default 200000 = 2x the local provider's default body cap), reusing the truncation notice. README EN+ZH, config catalog, Agent Note EN+ZH updated; the new web-fetch fixture is migrated to the packed layout master now requires; tool-web coverage stays 100% per-file.
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.