dsh-acp

Agent Client Protocol (ACP) server for the DeepSeek Harness (dsh).

Drive a full dsh coding agent - streaming output, tool calls, permission prompts, durable sessions - from Zed, JetBrains, or any ACP v1 client, exactly like opencode or Gemini CLI.

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What it does

dsh-acp is a dsh profile bundle: booting dsh --profile acp starts the entire DeepSeek Harness (agent loop, tools, sandbox, session persistence) with an ACP v1 JSON-RPC server on stdio instead of the web UI.

M1 (current release) implements:

ACP method	Status
initialize	✅ capabilities + agent info
session/new	✅ creates a durable dsh agent (persisted under $DSH_HOME/sessions)
session/prompt	✅ streaming agent_message_chunk / agent_thought_chunk (reasoning), plan updates, {stopReason}
tool calls	✅ full lifecycle: tool_call (pending, with title/kind/locations/rawInput) → in_progress → completed/failed with content
session/request_permission	✅ dsh's approval seam bridged to the client (allow once/always, reject once/always)
session/cancel	✅ aborts the turn, prompt resolves cancelled
session/close	✅ cancels, flushes, disposes the agent

Roadmap: session/load replay, session/resume/list, modes (plan mode) + config options (model), slash commands, images, elicitation - see the design doc.

Install

Requires Node.js ≥ 22, pnpm, and the dsh CLI (npm i -g @deepseek-ai/dsh).

# from a checkout of this repo (published package works the same way)
node bin/setup-profile.mjs --pkg /path/to/dsh-acp

# boots the ACP server on stdio
dsh --profile acp

The setup script creates $DSH_HOME/profiles/acp with dsh.profile.bundles = ["@deepseek-ai/dsh-base", "dsh-acp"] and installs the bundle via pnpm. Re-run it any time; --force rewrites the manifest.

Use with Zed

Zed → Settings → agent_servers:

{
  "dsh": {
    "type": "custom",
    "command": "dsh-acp",
    "args": []
  }
}

dsh-acp (installed by this package) is a thin launcher for dsh --profile acp; point DSH_BIN at a non-PATH dsh. Model credentials come from the usual dsh places ($DSH_HOME settings / DEEPSEEK_API_KEY), shared with the web UI - no second setup.

Development

pnpm install
pnpm run build     # tsc -> lib/
pnpm test          # unit tests (pure translation layer)

# end-to-end: boots the REAL dsh --profile acp in a throwaway $DSH_HOME
# with a deterministic mock LLM, and asserts the full M1 wire behavior
node test/e2e/e2e.test.mjs

The e2e harness is also the fastest way to iterate on protocol behavior: it drives initialize → new → prompt (text) → prompt (tool call) → close over real stdio.

How it maps

ACP client (Zed) ⇄ NDJSON JSON-RPC ⇄ dsh-acp plugin ⇄ dsh services
                                          ├─ ctx.agents.create/resume   (session/new, load)
                                          ├─ agent.followup/cancel      (session/prompt, cancel)
                                          ├─ 'session/event'            (streaming session/update)
                                          ├─ 'approval/request'         (session/request_permission)
                                          └─ dsh-base: tools, sandbox, persistence, settings

Full research behind every mapping: research/ - ACP protocol, DSH architecture, prior art, design blueprint.

Contributing

PRs welcome - see CONTRIBUTING.md. Milestone plan lives in research/acp-dsh-design.md §4.

License

MIT