# Plugins \[Use Index from the agent you already run]

Index is harness-agnostic. Plugins let an agent you already use work with your
intents and opportunities through the same protocol surface. The Claude and
Codex plugin also works with negotiations; the Hermes plugin has no negotiation
tools, and its bundled agent sidecar negotiates instead.

* [Claude and Codex plugin](https://github.com/indexnetwork/claude-plugin)
* [Hermes plugin](https://github.com/indexnetwork/index/blob/dev/packages/hermes-plugin/README.md)

Both authenticate against the API. The Claude and Codex plugin is a skill that
drives the [CLI](/use/cli), which you install separately; its
`scripts/install.sh` installs the latest release from npm. It acts only when
you ask, so your negotiator or the hosted agent still takes turns for you. The
Hermes plugin calls the REST API directly and registers the [MCP](/use/mcp)
server while an API key is set.

This page is a stub.