deepseek-harness/apps/cli

@deepseek-ai/dsh

The dsh command-line entry follows the apps/ assembly tier: apps/* are product assemblies over packages/* libraries. Plain dsh boots the interactive TUI coding agent, dsh -p "task" runs one headless turn, and dsh web serves the browser UI.

Argv is parsed once through a Commander adapter (src/args.ts): one program whose default (no subcommand) is the TUI/headless surface (--config, -p/--prompt, --resume) and whose web subcommand is the browser UI. src/bin.ts switches on the resolved mode and dynamic-imports only that mode's module. dsh --help lists every mode and dsh web --help renders the web usage, dsh --version prints this app's version, and an unknown option or an invalid --host/--port/--resume value fails loud (stderr, exit 1) instead of misrouting.

The TUI surface:

• boots the shipped default config (examples/tui-agent/cordis.yml), or the tree named by --config <path> (the demo/test escape for booting an alternate example tree), through dsh-app-boot;
• resumes a persisted session with dsh --resume <session-id> and, when the Node host exposes process.execve, supplies the TUI's in-place handoff host: after selector preflight and current-session flush, the host disposes the app and replaces the process with a normalized dsh --resume <id>; runtimes without process replacement keep the displayed command fallback. The flag provides the id on the boot context under RESUME_SESSION_ID_KEY (no environment variable), which the shipped config reads through !!js, and a missing or unreadable id fails loud instead of creating a fresh session;
• treats the invoking directory as the workspace — sessions, relative paths, and workspace instructions resolve from the cwd;
• tells the agent where its own source lives: after boot it adds a prompt section naming this harness checkout, resolved from the launcher's real path so it holds under a PATH symlink and an arbitrary cwd, so the self-referential cordis toolset can read and modify it;
• applies the personal overlay from ~/.dsh (see app-boot's Personal config): .env fills environment gaps (ambient > project .env > personal .env), config.yaml patches the booted tree.

The Web surface treats its invoking directory as the default project, loads applicable AGENTS.md/CLAUDE.md instructions into each agent-loop request prefix with a 65,536-byte render budget, and opts into first-message model titles. The headless surface retains deterministic fallback titles without making the auxiliary title-model request.

Install (developer machine)

Symlink the source-running launcher onto your PATH; it resolves the checkout through its own real path, so code changes apply on the next launch with no build step:

ln -sf "$(pwd)/bin/dsh" ~/.local/bin/dsh

pnpm run dsh runs the same entry from the repo root and forwards arguments directly, for example pnpm run dsh -p "task". The built form (lib/bin.js, via pnpm run build) boots the same config under plain Node.