Claude Code and Codex
Run Anthropic's Claude Code or OpenAI's Codex as the agent harness for Mogplex runs, automations, and Slack tasks.
A harness is the agent program that does the work inside a sandbox. Mogplex runs three harnesses:
| Harness | ID | What runs |
|---|---|---|
| Mogplex | mogplex | Mogplex's native agent. It is always available and uses any model in your catalog. |
| Claude Code | claude-code | Anthropic's claude CLI, in the sandbox. |
| Codex | codex | OpenAI's Codex, in the sandbox. It runs through the Agent Client Protocol (ACP). |
Mogplex installs a pinned version of Claude Code or Codex in the sandbox for each run, gives it the repository checkout, and streams its events into Observability. Claude Code runs also receive your MCP connections; see where connection tools load.
Requirements
Claude Code and Codex need model access. Each harness is available when you have one of these:
- Claude Code: an AI Gateway key, Mogplex platform AI on your plan, or an Anthropic key.
- Codex: an AI Gateway key, Mogplex platform AI on your plan, or an OpenAI key.
Add keys in Settings → Provider Keys. See AI provider keys for the order in which keys are used.
Choose a harness
| Where | How |
|---|---|
| Automations | Select the agent node, then choose Harness in the inspector. Unavailable harnesses are disabled. |
| Slack | /mogplex harness claude-code, /mogplex harness codex, or /mogplex harness mogplex. The choice applies to your future repository runs in that channel. |
| Hosted API and MCP | Pass harness when you start a run. The API defaults to codex. |
Run modes
Claude Code and Codex runs accept a mode that controls what the harness can do in the sandbox:
SAFE: the harness does not change the checkout.AUTO(default): the harness edits files and runs commands.YOLO: the harness runs without approval prompts. Claude Code still blocks its deny-listed tools and commands.
The Mogplex harness takes no mode. See Start a run for the details.
Use Mogplex from Claude Code or Codex on your machine
This page covers Claude Code and Codex running inside Mogplex. To let a local Claude Code, Codex, Cursor, or OpenCode session call Mogplex, install the Mogplex MCP endpoint.
AI Provider Keys
Bring your own Vercel AI Gateway, Anthropic, OpenAI, or OpenRouter key so Mogplex model usage bills to your provider account.
Vercel
How Mogplex uses Vercel Sandbox for agent compute, how to configure a repo's runtime and environment variables, and which Vercel features are not available.