How to integrate Postiz MCP with Antigravity

Connect Antigravity to Postiz MCP. Schedule a linkedin post for next monday, get analytics for your last facebook post, and more using natural language, with authentication handled for you.

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Postiz

Api Key

Postiz is an agentic social media scheduling tool for managing and growing your online presence. It helps you schedule posts, capture leads, and build an audience—all powered by AI.

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How to integrate Postiz 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 Postiz account to Antigravity IDE via Composio Connect, so it can schedule a LinkedIn post for next Monday, get analytics for your last Facebook post, list all scheduled posts for this week, and more without ever putting your account credentials at risk.

Why use Composio?

Composio provides:

Access to 1,500+ 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 Postiz 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 Postiz account

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

For example, ask it to:

"Schedule a LinkedIn post for next Monday"
"Get analytics for your last Facebook post"
"List all scheduled posts for this week"

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

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

Conclusion

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

TOOLS

Supported Tools

Every Postiz action and event your agent gets out of the box.

Ask postiz

Ask agent 'postiz' a question.

Generateimagetool

Generate image to use in a post, in case the user specified a platform that requires attachment and attachment was not provided, ask if they want to generate a picture of a video.

Generatevideooptions

All the options to generate videos, some tools might require another call to generateVideoFunction

Generatevideotool

Generate video to use in a post, in case the user specified a platform that requires attachment and attachment was not provided, ask if they want to generate a picture of a video.

Grouplist

This tool lists the available groups (customers).

Integrationlist

This tool list available integrations to schedule posts to.

Integrationscheduleposttool

Use this when the user wants to create a draft, scheduled, or immediate social media post on their connected channels, based on the integrationSchema tool.

Integrationschema

Everytime we want to schedule a social media post, we need to understand the schema of the integration.

Postsettingstool

Update the provider settings of an existing post (scheduled or draft) that was NOT published yet.

Postslisttool

List the organization's posts scheduled to be published between two dates (the same data as the "List Posts" API endpoint).

Triggertool

Use this to call a provider helper function (a methodName from the integrationSchema callable tools) that fetches provider-specific data needed for settings, like ids or search results.

Uploadfromurltool

Upload a remote image or video into the media library from a public URL.

Videofunctiontool

Sometimes when we want to generate videos we might need to get some additional information like voice_id, etc

Videostatustool

Check the status of a video generation started with 'generateVideoTool', using the jobId it returned.

FRAMEWORKS

How to build Postiz MCP Agent with another framework

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FAQ

Frequently asked questions

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

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 Postiz tools.

Yes, absolutely. You can configure which Postiz 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.

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 Postiz data and credentials are handled as safely as possible.

Start with Postiz.It takes 30 seconds.

Managed auth, hosted MCP servers, and every Postiz tool your agent needs.Free to start.

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How to integrate Postiz MCP with Antigravity

Connect Postiz without auth hassles

How to integrate Postiz MCP with Antigravity

Also integrate Postiz with

Why use Composio?

Connect Postiz to Antigravity

1. Open the MCP Config

2. Get your API key

3. Add Composio to mcp_config.json

Connect your Postiz account

Conclusion

Supported Tools

How to build Postiz MCP Agent with another framework

Claude Code

Cursor

ChatGPT

Claude Cowork

OpenAI Agents SDK

Claude Agent SDK

Codex

Grok Build

VS Code

OpenCode

OpenClaw

Hermes

Atomic Agent

Google ADK

LangChain

Vercel AI SDK

Mastra AI

LlamaIndex

CrewAI

Pydantic AI

AutoGen

Explore Other Toolkits

Google Sheets

Notion

Airtable

Asana

Frequently asked questions

What are the differences in Tool Router MCP and Postiz MCP?+

Can I use Tool Router MCP with Antigravity?+

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

How safe is my data with Composio Tool Router?+

Start with Postiz.It takes 30 seconds.

3. Add Composio to `mcp_config.json`