Agents

acpx ships with a registry of friendly agent names. Each one resolves to a specific ACP adapter command. Unknown names fall through as raw commands, and --agent <command> is the escape hatch for anything custom (see Custom agents).

The default agent for top-level commands like acpx exec … and acpx prompt … is codex.

#Built-in registry

factory-droid and factorydroid also resolve to the built-in droid adapter.

#Common shape

Every built-in agent supports the same command surface:

acpx <agent> [prompt_text...]                 # implicit prompt
acpx <agent> prompt [prompt_text...]          # explicit prompt
acpx <agent> exec [prompt_text...]            # one-shot, no saved session
acpx <agent> cancel [-s <name>]               # cooperative session/cancel
acpx <agent> set-mode <mode> [-s <name>]      # session/set_mode
acpx <agent> set <key> <value> [-s <name>]    # session/set_config_option
acpx <agent> status [-s <name>]
acpx <agent> sessions [list | new | ensure | close | show | history | prune]

See Prompting, Sessions, and Session control for the cross-agent semantics.

#Per-agent notes

Notes that override or extend the cross-agent behavior live below.

#Codex

• Built-in name: codex
• Default command: npx @zed-industries/codex-acp
• Upstream: zed-industries/codex-acp
• Runtime config keys exposed by current codex-acp releases: mode, model, reasoning_effort.
• acpx --model <id> codex … applies the requested model after session creation via session/set_config_option.
• acpx codex set thought_level <value> is accepted as a compatibility alias for codex-acp's reasoning_effort.

#Claude

• Built-in name: claude
• Default command: npx -y @agentclientprotocol/claude-agent-acp
• Upstream: agentclientprotocol/claude-agent-acp
• The built-in package range is pinned by acpx so fresh installs pick up Claude model and ACP adapter fixes without depending on a globally installed adapter binary.
• On Windows, acpx resolves the claude.exe executable from PATH before spawning so launches do not depend on shell-specific command lookup.
• --system-prompt and --append-system-prompt forward through ACP _meta.systemPrompt on session/new, letting you replace or append to the Claude Code system prompt without leaving a persistent session. The value persists in session_options.system_prompt so ensure/reuse keeps the override. Other agents ignore the field.

#Pi

• Built-in name: pi
• Default command: npx pi-acp
• Upstream: mariozechner/pi

#OpenClaw

• Built-in name: openclaw
• Default command: openclaw acp
• Upstream: openclaw/openclaw

For repo-local OpenClaw checkouts, override the built-in command in ~/.acpx/config.json so acpx openclaw … spawns the ACP bridge directly without the pnpm wrapper:

{
  "agents": {
    "openclaw": {
      "command": "env OPENCLAW_HIDE_BANNER=1 OPENCLAW_SUPPRESS_NOTES=1 node scripts/run-node.mjs acp --url ws://127.0.0.1:18789 --token-file ~/.openclaw/gateway.token --session agent:main:main"
    }
  }
}

#Cursor

• Built-in name: cursor
• Default command: cursor-agent acp
• Upstream: Cursor CLI

If your Cursor install exposes ACP as agent acp instead of cursor-agent acp, override:

{ "agents": { "cursor": { "command": "agent acp" } } }

#Gemini

• Built-in name: gemini
• Default command: gemini --acp
• Upstream: google/gemini-cli

#Copilot

• Built-in name: copilot
• Default command: copilot --acp --stdio
• Upstream: GitHub Copilot CLI
• Requires a Copilot CLI release that supports ACP stdio mode. Older copilot binaries fail before ACP startup.

#Droid (Factory)

• Built-in names: droid, factory-droid, factorydroid
• Default command: droid exec --output-format acp
• Upstream: factory.ai

#Qoder

• Built-in name: qoder
• Default command: qodercli --acp
• Upstream: Qoder CLI
• Reuses the Qoder CLI login state. For non-interactive runs, set QODER_PERSONAL_ACCESS_TOKEN.
• acpx qoder forwards --max-turns and --allowed-tools into Qoder CLI startup flags when those session options are set, so you do not need a raw --agent override for them.

#iFlow

• Built-in name: iflow
• Default command: iflow --experimental-acp
• Upstream: iflow-ai/iflow-cli

#Kilocode

• Built-in name: kilocode
• Default command: npx -y @kilocode/cli acp
• Upstream: kilocode.ai

#Kimi

• Built-in name: kimi
• Default command: kimi acp
• Upstream: MoonshotAI/kimi-cli

#Kiro

• Built-in name: kiro
• Default command: kiro-cli-chat acp
• Upstream: kiro.dev

#OpenCode

• Built-in name: opencode
• Default command: npx -y opencode-ai acp
• Upstream: opencode.ai

#Qwen

• Built-in name: qwen
• Default command: qwen --acp
• Upstream: QwenLM/qwen-code

#Trae

• Built-in name: trae
• Default command: traecli acp serve
• Upstream: docs.trae.cn

#Overriding a built-in

Any built-in can be replaced wholesale through config, including args for adapter sub-commands:

{
  "agents": {
    "codex": {
      "command": "/usr/local/bin/codex-acp",
      "args": ["--profile", "ci"]
    }
  }
}

CLI flags still win over config. See Config for precedence rules.

#See also

• Custom agents — --agent <command> and unknown positional names.
• Sessions — how the agent command becomes part of the session scope key.
• Authentication — ACPX_AUTH_* env vars and config auth entries for ACP authenticate handshakes.