What is ext-agent?
ext-agent is a Claude Code mod by darkautism that run Claude Code subagents in pi or opencode instead of a Claude model. Adds the ext-agent:worker agent type; built-in subagents stay available unless you opt in to blocking them. It is listed under Agents & automation and has no public popularity data yet.
| Type | Claude code mod |
|---|---|
| Author | darkautism |
| Repository | darkautism/ext-agent |
| Popularity | no public popularity data yet |
| Category | Agents & automation |
| Security | Low risk (88/100) |
| Rank | #2,987 of 5,272 Claude Code mods; #225 in Agents & automation |
| License | MIT |
| Last commit | 2026-10-02 |
| Hooks | 5 events |
| Sees | Agent calls, compaction, every tool call |
| Draws on | nothing |
Is ext-agent safe to install?
ext-agent scores 88/100 on the MCPMods security check: Low risk. Things to review: starts processes outside the sandbox. It passed 7 of 8 checks.
Mod footprints come from claude plugin validate, which lists every event a mod hooks and every API call it makes without running it.
| Check | Result |
|---|---|
| No network access | Pass |
| Starts processes outside the sandbox | Review |
| Writes no files or config | Pass |
| Doesn't read environment variables | Pass |
| Only sees the events it hooks | Pass |
| Doesn't drive Claude | Pass |
| Passes claude plugin validate | Pass |
| Has an open-source license | Pass |
API calls in its code
| Call | What it means |
|---|---|
$.agent.list | |
$.process.run | runs processes |
$.process.spawn | |
$.session.cwd | |
$.session.messages | reads the transcript |
$.settings.read | reads settings |
How do I install ext-agent?
- Check your Claude Code version. Mods need Claude Code 2.1.287 or later and are on by default.
claude --version
- Read its footprint. This lists every event it hooks and every API call it makes, without running it.
git clone https://github.com/darkautism/ext-agent claude plugin validate ./ext-agent/plugins/ext-agent
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add darkautism/ext-agent && claude plugin install ext-agent@ext-agent
Or ask Claude to set it up
Paste this into Claude Code and it installs ext-agent for you:
Install the "ext-agent" Claude Code mod from https://github.com/darkautism/ext-agent/tree/main/plugins/ext-agent. Run claude plugin validate on it first and show me what it can access before you enable it.