> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vijil.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# OpenRouter (Legacy)

> Legacy OpenRouter integration docs copied from the integrations-section branch.

You can register agents on Vijil that use OpenRouter models such as `microsoft/phi-4`, `google/gemini-2.5-flash-preview`, and `x-ai/grok-3-beta`.

## Prerequisites

* You have an OpenRouter account with an active API key.
* Your OpenRouter account has access to the models you plan to use.
* You have access to a Vijil team and permission to manage **[Keys](https://evaluate.vijil.ai/keys)** and **[Agents](/tutorials/manage-agents/)**.

## Store OpenRouter Credentials in Vijil

1. In Vijil, go to **[Keys](https://evaluate.vijil.ai/keys) > Add new key**.
2. From the **Model Hub** dropdown, select **OpenRouter**.
3. Enter your OpenRouter API key and any optional rate limit overrides you want for this key.
4. Save the key configuration.

Once saved, this key can be reused across multiple OpenRouter-based agents.

## Register an Agent on Vijil

With an OpenRouter API key configured, you can register an agent that uses OpenRouter:

<img src="https://mintcdn.com/vijil/t1_8aRtSIj494eFA/images/legacy/openrouter.webp?fit=max&auto=format&n=t1_8aRtSIj494eFA&q=85&s=3e7c3814bf30526aa802498aaedacb85" alt="Setting up an OpenRouter-based Agent in Vjil" width="920" height="885" data-path="images/legacy/openrouter.webp" />

1. Press **Register [Agent](/tutorials/manage-agents/)**.
2. Enter an [Agent](/tutorials/manage-agents/) name.
3. Select **OpenRouter** as the **Hub**.
4. Enter a model name (for example `microsoft/phi-4` or `x-ai/grok-3-beta`). See the OpenRouter documentation or dashboard for the list of available models.
5. Select an existing OpenRouter API key you configured earlier, or create a new one.
6. Add a **System Prompt** if you want Vijil to send a default system prompt with every request to this agent.

## Enterprise

If your organization uses enterprise-only features with Vijil:

1. Add an **MCP server URL** so the agent can access MCP tools exposed by that server.
2. Add an **A2A Agent Card URL** so this agent can participate in agent-to-agent workflows defined in your enterprise.