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pi-dsh-mimic

pi-dsh-mimic changes only the first DeepSeek V4 Pro request in Pi. The real task begins with the DSH Minimal persona and its bash and str_replace_editor tools. After the first valid response, later requests return to Pi-native formatting and the complete tool catalog.

It does not require the full DSH harness and adds no extra model round.

How it works

1. In a fresh target session, the original task becomes the Minimal request.
2. The first successful assistant response or actual tool call ends bootstrap.
3. Later requests keep the Minimal persona while Pi again owns payload encoding, tool ordering, and plugin tools.

Provider errors and aborted responses do not consume bootstrap. A small Pi custom entry persists the phase across resume. If the process crashes after a completed response but before the phase is recorded, durable assistant/tool history repairs the state on reload.

Experimental result

On one frozen Project2 V4.1b long-horizon maintenance task, default Pi scored 92. Four final runs of the same one-shot flow scored 98, 96, 96, and 98. This comparison supports the current first-request design; it does not establish a general result across projects, model revisions, or evaluations.

See Experiments and design for conditions, negative results, and implementation choices. The Project2 evidence ledger contains the complete runs and evaluator sources.

Install and use

Requirements: Node.js 22.19 or later, Pi 0.84.2 or later, and a provider configured in Pi whose model id contains deepseek-v4-pro. The official DeepSeek API and OpenCode Go are the repository-qualified routes. The extension also activates for third-party providers; compatibility, data handling, and billing then follow the provider selected by the user.

Install for the current user:

pi install npm:pi-dsh-mimic

Install at project scope:

pi install -l npm:pi-dsh-mimic

Try the current checkout directly:

pi -e ./packages/pi-dsh-mimic \
  --provider deepseek \
  --model deepseek-v4-pro

For OpenCode Go, set Pi's expected OPENCODE_API_KEY environment variable and select the opencode-go provider.

Select V4 Pro before starting a new session. Switching to V4 Pro inside an existing conversation does not create a synthetic bootstrap. The extension registers str_replace_editor in a target session; if that same session later switches to another model, the tool may remain in the current catalog. Start a new session when a clean non-target tool catalog matters.

Request changes

	First request	Later requests
Persona	You are a helpful software engineer assistant.	unchanged
User history	Original task, including Pi images	unchanged
Tools	bash, str_replace_editor	Pi's current full catalog, including plugin tools
Payload	DSH Minimal shape	Pi-native encoding and ordering

str_replace_editor can view, create, and modify absolute paths with the Pi process's filesystem permissions. The task, context, and tool results are sent to the provider selected by the user. The extension does not read or store API keys. See SECURITY.md for the full boundary.

Development

cd packages/pi-dsh-mimic
npm install
npm run check
npm run pack:check

The Minimal persona and two tool protocols come from DeepSeek Harness's public Minimal protocol. See LICENSE and NOTICE. This project is not affiliated with or endorsed by Pi, DeepSeek, OpenCode, or OpenAI.