2143361195
Second review round escalated the wrap-width divergence from a separate concern to a defect in this fix's own premise, and it is right. Only .input scrolls, so only .input loses content width to a scrollbar that consumes layout space — what Windows and Firefox draw, and what the theme's global `::-webkit-scrollbar` width makes chromium treat as occupying space. A narrower .input wraps a long soft-wrapped draft onto more lines, so it grows taller, its scroll maximum exceeds the backdrop's, and the mirrored offset clamps below the caret. That is the same failure the trailing-line sentinel fixes, in the same direction, so deferring it would have shipped a fix that does not hold where users run a classic scrollbar. My first attempt to reproduce it found nothing and was wrong: the probe content was not wrap-sensitive. With varied-length words the effect is plain — the same draft laid out at 8px-apart widths differs by 2 to 5 lines, while at equal widths a textarea and a div agree exactly. The three layers now reserve the gutter together, in the shared metrics block that already exists to keep them symmetric. `overflow: hidden` is still a scroll container, so the non-scrolling layers honour it: 8px is reserved on each, measured. The cost is a text column 8px narrower on every platform, which is the price of one geometry rather than a per-platform one. The browser scenario asserts the premise directly — equal wrap widths, and a reserved band greater than zero on each layer. The band is what stops the assertion being vacuous: the widths would also match with no reservation at all on this engine's overlay scrollbar, and it is the reservation, not the match, that carries the guarantee to a platform whose scrollbar takes real width. Removing the declaration fails it with `expected 0 to be greater than 0`, and fails the golden with it. Also from the same round, three comment corrections: the e2e file header no longer describes the deleted layout effect, the measurement guard no longer claims the backdrop holds exactly one text node (the sentinel makes a second), and the sentinel comment now carries the one-sidedness argument that also settles the ghost hint — the mirror only fails when the backdrop is SHORTER, and the hint can only add content, never remove a line box.
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.