How to integrate OnlySocial MCP with Claude Agent SDK

This guide walks you through connecting OnlySocial to the Claude Agent SDK using the Composio tool router. By the end, you'll have a working OnlySocial agent that can list your social accounts, review posts, upload media, create tags, and organize your tags through natural language commands. This guide will help you understand how to give your Claude Agent SDK agent real control over a OnlySocial account through Composio's OnlySocial MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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OnlySocial is a social media management platform for workspaces, accounts, media, tags, posts, and account groups. Use it to organize and manage social publishing operations from one place.

10 Tools

Introduction

This guide walks you through connecting OnlySocial to the Claude Agent SDK using the Composio tool router. By the end, you'll have a working OnlySocial agent that can list your social accounts, review posts, upload media, create tags, and organize your tags through natural language commands.

This guide will help you understand how to give your Claude Agent SDK agent real control over a OnlySocial account through Composio's OnlySocial MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

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TL;DR

Here's what you'll learn:
  • Get and set up your Claude/Anthropic and Composio API keys
  • Install the necessary dependencies
  • Initialize Composio and create a Tool Router session for OnlySocial
  • Configure an AI agent that can use OnlySocial as a tool
  • Run a live chat session where you can ask the agent to perform OnlySocial operations

What is Claude Agent SDK?

The Claude Agent SDK is Anthropic's official framework for building AI agents powered by Claude. It provides a streamlined interface for creating agents with MCP tool support and conversation management.

Key features include:

  • Native MCP Support: Built-in support for Model Context Protocol servers
  • Permission Modes: Control tool execution permissions
  • Streaming Responses: Real-time response streaming for interactive applications
  • Context Manager: Clean async context management for sessions

What is the OnlySocial MCP server, and what's possible with it?

The OnlySocial MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your OnlySocial account. It provides structured and secure access to your connected social accounts, posts, media, and tags, so your agent can review accounts, inspect posts, manage media, and organize tags on your behalf.

  • Connected account visibility: Have your agent list connected social accounts and check their providers and authorization status.
  • Post review: Let the agent browse workspace posts and retrieve a specific post with its accounts, tags, and content versions.
  • Media library management: Direct your agent to browse images and videos, inspect file details and alt text, or upload new media for future posts.
  • Tag organization: Instruct your agent to list, create, rename, recolor, or delete tags used to organize your social content.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

  1. Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
  2. Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
  3. Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step09 STEPS
1

Prerequisites

Before starting, make sure you have:
  • Composio API Key and Claude/Anthropic API Key
  • Primary know-how of Claude Agents SDK
  • A OnlySocial account
  • Some knowledge of Python
2

Getting API Keys for Claude/Anthropic and Composio

Claude/Anthropic API Key
  • Go to the Anthropic Console and create an API key. You'll need credits to use the models.
  • Keep the API key safe.
Composio API Key
  • Log in to the Composio dashboard.
  • Navigate to your API settings and generate a new API key.
  • Store this key securely as you'll need it for authentication.
3

Install dependencies

npm install @anthropic-ai/claude-agent-sdk @composio/core dotenv

Install the Composio SDK and the Claude Agents SDK.

What's happening:

  • @composio/core provides Composio integration for Anthropic
  • @anthropic-ai/claude-agent-sdk is the core agent framework
  • dotenv/config loads environment variables
4

Set up environment variables

bash
COMPOSIO_API_KEY=your_composio_api_key_here
USER_ID=your_user_id_here
ANTHROPIC_API_KEY=your_anthropic_api_key_here

Create a .env file in your project root.

What's happening:

  • COMPOSIO_API_KEY authenticates with Composio
  • USER_ID identifies the user for session management
  • ANTHROPIC_API_KEY authenticates with Anthropic/Claude
5

Import dependencies

import 'dotenv/config';
import readline from 'node:readline';
import { Composio } from '@composio/core';
import { query, type Options } from "@anthropic-ai/claude-agent-sdk";

dotenv.config();
What's happening:
  • We're importing all necessary libraries including the Claude Agent SDK and Composio
  • The dotenv.config() function loads environment variables from your .env file
  • This setup prepares the foundation for connecting Claude with OnlySocial functionality
6

Create a Composio instance and Tool Router session

async function chat() {
  const { COMPOSIO_API_KEY, USER_ID } = process.env;
  if (!COMPOSIO_API_KEY || !USER_ID) {
    throw new Error('COMPOSIO_API_KEY and USER_ID required in .env');
  }

  const composio = new Composio({ apiKey: COMPOSIO_API_KEY });

  // Create Tool Router session for OnlySocial
  const session = await composio.create(USER_ID, {
    toolkits: ['onlysocial'],
  });
  const mcpUrl = session?.mcp.url;
What's happening:
  • The function checks for the required COMPOSIO_API_KEY environment variable
  • We're creating a Composio instance using our API key
  • The create method creates a Tool Router session for OnlySocial
  • The returned url is the MCP server URL that your agent will use
7

Configure Claude Agent with MCP

const options: Options = {
  permissionMode: 'bypassPermissions',
  mcpServers: {
    composio: {
      type: 'http',
      url: mcpUrl,
      headers: { 'x-api-key': COMPOSIO_API_KEY }
    }
  },
  systemPrompt: 'You are a helpful assistant with access to OnlySocial tools via Composio.',
  maxTurns: 10,
};
What's happening:
  • We're configuring the Claude Agent options with the MCP server URL
  • permissionMode: 'bypassPermissions' allows the agent to execute operations without asking for permission each time
  • The system prompt instructs the agent that it has access to OnlySocial
  • maxTurns: 10 limits the conversation length to prevent excessive API usage
8

Create client and start chat loop

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: 'You: '
  });

  console.log('\nChat started. Type "exit" to quit.\n');

  let isProcessing = false;

  async function ask(prompt: string) {
    isProcessing = true;
    rl.pause();

    process.stdout.write('Claude is thinking...');
    const stream = query({ prompt, options });

    let firstChunk = true;
    for await (const msg of stream) {
      const content = (msg as any).message?.content || (msg as any).content;
      if (Array.isArray(content)) {
        for (const block of content) {
          if (block.type === 'text' && block.text) {
            if (firstChunk) {
              process.stdout.write('\r\x1b[K');
              process.stdout.write('Claude: ');
              firstChunk = false;
            }
            process.stdout.write(block.text);
          }
        }
      }
    }
    process.stdout.write('\n\n');

    isProcessing = false;
    rl.resume();
    rl.prompt();
  }

  rl.on('line', async (line) => {
    if (isProcessing) return;

    const input = line.trim();
    if (input === 'exit') {
      rl.close();
      process.exit(0);
    }
    if (input) await ask(input);
    else rl.prompt();
  });

  await ask('What can you help me with?');
}
What's happening:
  • The readline interface is created to handle user input and output
  • The query function is used to send the user's input to the agent
  • The chat loop continues until the user types 'exit' or 'quit'
9

Run the application

try {
  await chat();
} catch (error) {
  console.error(error);
  process.exit(1);
}
What's happening:
  • The chat function is the entry point for the application
  • The try-catch block is used to handle any errors that occur

Complete Code

Here's the complete code to get you started with OnlySocial and Claude Agent SDK:

import 'dotenv/config';
import readline from 'node:readline';
import { Composio } from '@composio/core';
import { query, type Options } from "@anthropic-ai/claude-agent-sdk";

async function chat() {
  const { COMPOSIO_API_KEY, USER_ID } = process.env;
  if (!COMPOSIO_API_KEY || !USER_ID) {
    throw new Error('COMPOSIO_API_KEY and USER_ID required in .env');
  }

  const composio = new Composio({ apiKey: COMPOSIO_API_KEY });
  const session = await composio.create(USER_ID, {
    toolkits: ['onlysocial']
  });
  const mcp_url = session?.mcp.url;

  const options: Options = {
    permissionMode: 'bypassPermissions',
    mcpServers: {
      composio: {
        type: 'http',
        url: mcp_url,
        headers: { 'x-api-key': COMPOSIO_API_KEY }
      }
    },
    systemPrompt: 'You are a helpful assistant with access to OnlySocial tools via Composio.',
    maxTurns: 10,
  };

  const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: 'You: '
  });

  console.log('\nChat started. Type "exit" to quit.\n');

  let isProcessing = false;

  async function ask(prompt: string) {
    isProcessing = true;
    rl.pause();

    process.stdout.write('Claude is thinking...');
    const stream = query({ prompt, options });

    let firstChunk = true;
    for await (const msg of stream) {
      const content = (msg as any).message?.content || (msg as any).content;
      if (Array.isArray(content)) {
        for (const block of content) {
          if (block.type === 'text' && block.text) {
            if (firstChunk) {
              process.stdout.write('\r\x1b[K');
              process.stdout.write('Claude: ');
              firstChunk = false;
            }
            process.stdout.write(block.text);
          }
        }
      }
    }
    process.stdout.write('\n\n');

    isProcessing = false;
    rl.resume();
    rl.prompt();
  }

  rl.on('line', async (line) => {
    if (isProcessing) return;

    const input = line.trim();
    if (input === 'exit') {
      rl.close();
      process.exit(0);
    }
    if (input) await ask(input);
    else rl.prompt();
  });

  await ask('What can you help me with?');
}

try {
  await chat();
} catch (error) {
  console.error(error);
  process.exit(1);
}

Conclusion

You've successfully built a Claude Agent SDK agent that can interact with OnlySocial through Composio's Tool Router.

Key features:

  • Native MCP support through Claude's agent framework
  • Streaming responses for real-time interaction
  • Permission bypass for smooth automated workflows
You can extend this by adding more toolkits, implementing custom business logic, or building a web interface around the agent.
TOOLS

Supported Tools

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

Create Tag

Create a named, color-coded tag in the configured OnlySocial workspace.

Delete Tag

Permanently delete one tag from the configured OnlySocial workspace.

Get Media

Get one OnlySocial media file by UUID, including its URLs, type, and alt-text metadata returned by the provider.

Get Post

Get one OnlySocial post by UUID with its accounts, tags, and content versions.

List Social Accounts

List the social accounts connected to the configured OnlySocial workspace, including provider and authorization status.

List Media

Return one page of media files from the configured OnlySocial workspace for selection when composing posts.

List Posts

Return one page of posts from the configured OnlySocial workspace.

List Tags

List all tags in the configured OnlySocial workspace for organizing or filtering posts.

Update Tag

Replace the name and color of an existing OnlySocial tag.

Upload Media

Upload an image or video file to the configured OnlySocial workspace for later use in posts.

FRAMEWORKS

How to build OnlySocial MCP Agent with another framework

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OpenAI Agents SDK

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Claude Code

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Claude Cowork

Use OnlySocial MCP with Claude Cowork

Codex logo

Codex

Use OnlySocial MCP with Codex

OpenClaw logo

OpenClaw

Use OnlySocial MCP with OpenClaw

Hermes logo

Hermes

Use OnlySocial MCP with Hermes

CLI logo

CLI

Use OnlySocial MCP with CLI

Google ADK logo

Google ADK

Use OnlySocial MCP with Google ADK

LangChain logo

LangChain

Use OnlySocial MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use OnlySocial MCP with Vercel AI SDK

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Mastra AI

Use OnlySocial MCP with Mastra AI

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LlamaIndex

Use OnlySocial MCP with LlamaIndex

CrewAI logo

CrewAI

Use OnlySocial MCP with CrewAI

FAQ

Frequently asked questions

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

Yes, you can. Claude Agent SDK 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 OnlySocial tools.

Yes, absolutely. You can configure which OnlySocial 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 OnlySocial data and credentials are handled as safely as possible.

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