How to integrate Openrouter MCP with Antigravity

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How to integrate Openrouter MCP with Antigravity

Antigravity IDE is Google's agentic IDE, built on a VS Code-style editor and powered by models like Gemini 3.5 Flash, Gemini 3.1 Pro, Opus 4.6, and more. It treats the AI agent as a first-class teammate, planning, coding, and validating work through an Agent Manager dashboard with deep browser connectivity.

In this guide, I will explain the easiest and most secure way to connect your Openrouter account to Antigravity IDE via Composio Connect, so it can generate Python code from this prompt, summarize this article using Claude-3, list all available Llama-3 model endpoints, and more without ever putting your account credentials at risk.

Also integrate Openrouter with

Why use Composio?

Composio provides:

  • Access to 1,000+ managed apps from a single MCP endpoint. This makes it convenient for agents to run cross-app workflows.
  • Programmatic tool calling. Allows LLMs to write code in a remote workbench to handle complex tool chaining. Reduces to-and-fro with LLMs for frequent tool calling.
  • Large tool response handling outside the LLM context. This minimizes context bloat from large tool responses.
  • Dynamic just-in-time access to thousands of tools across hundreds of apps. Composio loads the tools your agent needs, so LLMs are not overwhelmed by tools they do not need.

Connect Openrouter to Antigravity

Antigravity does not ship with one-click custom MCP install links yet, so configuration goes through the IDE's raw config file. The process takes under a minute.

1. Open the MCP Config

Go to Antigravity Settings, open the Customizations tab, then click Open MCP Config to open mcp_config.json in the editor.

Antigravity Customizations settings with Open MCP Config button

2. Get your API key

Go to the Composio Dashboard and copy your API key.

Composio Dashboard showing where to get the API key

3. Add Composio to mcp_config.json

Paste the following configuration into the file:

bash
{
  "mcpServers": {
    "remote-composio": {
      "serverUrl": "https://connect.composio.dev/mcp",
      "headers": {
        "x-consumer-api-key": "your-composio-api-key"
      }
    }
  }
}

Note: Antigravity uses serverUrl, not url, for remote HTTP-based MCP servers. This differs from the url key used in Cursor and VS Code configs.

Save the file and click refresh in the Installed MCP Servers section.

Antigravity showing Composio tools after MCP setup

Connect your Openrouter account

Back in the Antigravity agent panel, ask the agent to connect to Openrouter or give it any Openrouter-related task.

For example, ask it to:

  • "Generate Python code from this prompt"
  • "Summarize this article using Claude-3"
  • "List all available Llama-3 model endpoints"

It will prompt you to authenticate and authorize access to Openrouter.

That is it. Composio tools are now available in Antigravity, and your Openrouter account is ready to use.

Supported Tools & Triggers

Tools
Create Chat CompletionTool to generate a chat-style completion.
Create Coinbase ChargeTool to create a Coinbase charge for crypto payment to add credits to your OpenRouter account.
Create Message (Anthropic Format)Tool to create a message using Anthropic Messages API format via OpenRouter.
Get CreditsTool to get the current API credit balance for the authenticated user.
Get Current KeyTool to get information about the currently authenticated API key.
Get GenerationTool to retrieve a generation result by its unique ID.
Get Models CountTool to get the total count of available models on OpenRouter.
List Available ModelsTool to list available models via OpenRouter API.
List Embedding ModelsTool to list all available embeddings models via OpenRouter API.
OpenRouter List Model EndpointsTool to list endpoints for a specific model.
OpenRouter List ProvidersTool to list all AI model providers available through the OpenRouter API.
List User ModelsTool to list models filtered by user provider preferences, privacy settings, and guardrails.
OpenRouter List ZDR EndpointsTool to preview the impact of Zero Data Retention (ZDR) on the available endpoints.

Conclusion

You have successfully connected Openrouter to Antigravity using Composio Connect. Your agent can now use Openrouter securely without exposing credentials in prompts or local scripts.

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FAQ

What are the differences in Tool Router MCP and Openrouter MCP?

With a standalone Openrouter MCP server, the agents and LLMs can only access a fixed set of Openrouter tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Openrouter and many other apps based on the task at hand, all through a single MCP endpoint.

Can I use Tool Router MCP with Antigravity?

Yes, you can. Antigravity fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Openrouter tools.

Can I manage the permissions and scopes for Openrouter while using Tool Router?

Yes, absolutely. You can configure which Openrouter scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

How safe is my data with Composio Tool Router?

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Openrouter data and credentials are handled as safely as possible.

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HubSpot
Agent.ai
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DataStax
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Context
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai

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