DeepSeek Harness

Replicas supports DeepSeek Harness as a coding agent. The official DSH runtime runs inside the workspace and uses OpenRouter for inference.

Setup

Create a key on the OpenRouter keys page.
Paste it under DeepSeek Harness → OpenRouter API Key in Organization → Coding Agents.
Set an organization credential for the team, or add a personal key under Personal to override it.

The OpenRouter key and enabled-model selection are shared with Opencode and Pi. See Credentials for credential scope and fallback behavior.

Models

Organization admins choose models under DeepSeek Harness → OpenRouter models in Coding Agents settings. Until changed, Replicas enables:

Model ID	Label	Notes
`deepseek/deepseek-v4-pro-0813`	DeepSeek V4 Pro	Default
`deepseek/deepseek-v4-flash-0731`	DeepSeek V4 Flash	Faster V4 model
`z-ai/glm-5.2`	GLM 5.2	General agentic coding
`stealth/ox-alpha`	Ox Alpha	Free stealth reasoning model
`minimax/minimax-m3`	MiniMax M3	Long-context agentic coding
`xiaomi/mimo-v2.5-pro`	MiMo V2.5 Pro	Agent-focused Xiaomi model
`moonshotai/kimi-k2.6`	Kimi K2.6	Multimodal coding model

Choose an organization default under Defaults, a personal default in account preferences, or a model for the active chat from the workspace composer.

Using DeepSeek Harness in Workspaces

Choose DeepSeek Harness from the composer’s agent picker. It can:

Read, write, and edit repository files
Run shell commands and show tool activity in chat
Accept image attachments
Ask questions in the composer
Use Plan Mode
Discover skills and expose them as slash commands
Persist sessions, tool history, jobs, and context usage across turns
Steer a queued message into the active turn
Interrupt an active turn

DeepSeek Harness runs with full workspace access and does not request approval before using tools. DeepSeek Harness does not support Fast Mode or Codex goal mode.

Programmatic Use

Select DeepSeek Harness anywhere Replicas accepts a coding agent:

Surface	How to choose DeepSeek Harness
CLI	`-a deepseek` on `replicas create` and `replicas send`
API	`"coding_agent": "deepseek"` on create and message requests
MCP	`"coding_agent": "deepseek"` on `create_replica` and `send_replica_message`
Automations	Set Coding agent to DeepSeek Harness
Defaults	Select DeepSeek Harness as the organization or personal default

replicas create fix-tests \
  -e backend \
  -a deepseek \
  -m "Inspect the repository and fix the failing tests"

replicas send REPLICA_ID \
  -a deepseek \
  -m "Run the tests and address any remaining failures"

curl -X POST "https://api.replicas.dev/v1/replica" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "fix-tests",
    "environment_id": "ENVIRONMENT_UUID",
    "message": "Inspect the repository and fix the failing tests",
    "coding_agent": "deepseek",
    "model": "deepseek/deepseek-v4-pro-0813"
  }'

Get started

Workspaces

Coding agents

Integrations

Build and automate

Apps

Admin

Updates

Setup

Models

Using DeepSeek Harness in Workspaces

Programmatic Use

​Setup

​Models

​Using DeepSeek Harness in Workspaces

​Programmatic Use

Setup

Models

Using DeepSeek Harness in Workspaces

Programmatic Use