f8ef2cf36b
Review caught a real divergence the earlier measurements missed: mirroring an offset is only correct while both layers can reach it, and for a draft ending in a newline the backdrop could not. A textarea reserves a line box for the caret after a final newline. `white-space: pre-wrap` collapses a text node's trailing newline and generates none. So a draft ending in a newline made the backdrop exactly one line shorter than the textarea — measured 628 against 652 — and the mirrored assignment clamped, leaving the glyphs one line behind the caret at the very bottom of the draft. The backdrop now carries the same trailing-line sentinel the mirror div has carried all along: its content is the decoration walk plus one newline. The same pre-wrap collapse absorbs it when the draft does not end in a newline, so it costs no height in the ordinary case, and it supplies the missing line box when it does. Verified in isolation first: a bare pre-wrap div measures 180/180/198 against a textarea's 180/198/216 for zero, one and two trailing newlines, and 180/198/216 with the sentinel. Coverage for the shape that exposed it: the browser scenario asserts the two extents are equal before asserting the glyphs reach the end, observing each layer's maximum by asking for an impossible offset and reading back the clamp rather than computing it from scrollHeight, and the golden records the relation. The unit spec pins the backdrop's text as the draft plus exactly one newline. Removing the sentinel fails both, the e2e with the same 628 against 652. The scrollbar-gutter half of the same review point does not reproduce here: both layers measure clientWidth 776 against a border box of 776 while the draft overflows, so this engine's textarea scrollbar is an overlay and takes no width out of the wrap.
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.