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docs/connectors.mdx

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---
title: Connectors
description: Choose an agent application and connect its sessions to a Cotal mesh.
kind: "Guide (informative)"
audience: operators
---

import { Card, Cards } from 'fumadocs-ui/components/card';

A connector gives an agent session the [Cotal tools](mcp-tools.mdx), presence, and peer messages.
Every connector hands its agent the same [briefing](agent-briefing.mdx) when the session starts.
Choose the application you already use, then follow its guide.
Each guide lists the connector's requirements and supported features.

<Cards>
  <Card title="Claude Code" href="connect-claude.mdx">
    Connect Claude Code through its installed plugin. Supports session forks and shared MCP tools.
  </Card>
  <Card title="OpenCode" href="connect-opencode.mdx">
    Connect OpenCode through its native plugin runtime. Supports OpenCode 1.x and 2.x.
  </Card>
  <Card title="Codex" href="connect-codex.mdx">
    Connect a Codex app-server session, or your own Codex conversation through the Cotal plugin. Directed peer messages can steer connector-started turns.
  </Card>
  <Card title="Hermes" href="connect-hermes.mdx">
    Connect the Hermes gateway on Unix. Each inbound message starts a fresh agent.
  </Card>
  <Card title="Jcode" href="connect-jcode.mdx">
    Connect a Jcode Harness API session. Supports session forks and directed messages during a turn.
  </Card>
  <Card title="pi" href="connect-pi.mdx">
    Connect an interactive pi session or an agent built with pi's SDK. Peer messages can steer the running turn.
  </Card>
</Cards>

## Compare support

| Connector | Maturity | Resume a session with `--resume` | Share selected MCP tools with `--share-tools` | List models with `cotal models` |
|---|---|---|---|---|
| Claude Code | Stable | Forks the source session | Supported | Models the Claude login can use |
| OpenCode | Beta | Unsupported | Unsupported. Inherits the user's MCP servers. | Models and variants on 1.x and 2.x |
| Codex | Beta | Unsupported | Unsupported. Uses an isolated `CODEX_HOME`. | Models and reasoning efforts |
| Hermes | Alpha | Forks the source session | Unsupported | Unsupported |
| Jcode | Beta | Forks the source session | Unsupported. Uses private MCP configuration. | Models declared in the Jcode configuration |
| pi | Alpha | Forks the source session | Unsupported | Models of providers pi holds credentials for |

An unsupported option fails the launch. Cotal does not silently ignore it.
For containers, see the current [deployment limits](deploy.mdx).

## Delivery behavior [#compare-delivery-and-transports]

| Connector | Inbound delivery and steering | Cotal tool transport | Event plane |
| --- | --- | --- | --- |
| Claude Code | Managed hooks drain at turn start and use idle nudges. Personal native sessions also deliver at supported busy boundaries. | stdio MCP | Supported |
| OpenCode | Injects a turn. No mid-turn steering. | In-process plugin tools | Supported |
| Codex | Wakes a turn and steers connector-started turns. External turns defer automatic delivery. | Loopback MCP with a per-host bearer | Supported |
| Hermes | Creates a fresh agent for each message. | Unix socket with a control token | Unsupported; requires `--no-events` |
| Jcode | Injects a Harness turn; directed messages steer its live session. | stdio MCP bridge relayed over a private Unix socket | Supported |
| pi | Steers the live turn inside its process. | In-process tools | Completed-message events |

Jcode requires Node 22.13 or later; Node 23 requires 23.4 or later.
All managed connectors also use connector-core's authenticated local lifecycle-control socket.
The Manager reports event support in `status.connectors[].eventPlane`. A connector without event support cannot launch in a space requiring events.
Native queue acceptance does not prove the model consumed the message.
See [Running release](connector-runtime-reference.mdx#running-release) when installed and running versions differ.

## Choose the connector for a launch

To select a connector for one launch, use `cotal spawn --harness <connector>`.
The supported names are `claude`, `opencode`, `codex`, `hermes`, `jcode`, and `pi`.
See [Launch agents](launch-agents.mdx) for launch modes and examples.

Cotal chooses the connector in this order:

1. The launch's explicit `--harness` option.
2. The persona file's `agent:` field.
3. `COTAL_DEFAULT_AGENT`.
4. The saved [`harness` preference](config.mdx#preferences).
5. The product default, Claude Code.

A persona's `agent:` field takes precedence over a default. An unknown connector
name fails the launch. See [Agent files](agent-files.mdx) to configure a persona.

For a managed launch, the caller sends its environment or saved preference as a
default. If the caller supplies neither, the manager's `COTAL_DEFAULT_AGENT`
applies before the product default.

For connection state, resume records, and implementation contracts, see the
[connector runtime reference](connector-runtime-reference.mdx).