LLM API MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with LLM API MCP or direct API to generate text, create embeddings, process images and audio, and run batch workloads through natural language.

LLM API logoLLM API
Api Key

LLM API is a unified inference service for text, embeddings, images, audio, video, files, and batch workloads across AI providers. It gives teams one consistent API for accessing multiple models and media capabilities.

12 Tools

Try LLM API now

Type what you want done — sign in and watch it run live in the Tool Router playground.

TOOL ROUTER PLAYGROUND
LLM API
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TOOLS

Supported Tools

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

Cancel Batch

Request best-effort cancellation of an in-progress batch.

Count Anthropic Message Tokens

Count input tokens for an Anthropic-compatible message request without generating a model response.

Create Anthropic Message

Generate one complete, non-streaming Anthropic-compatible message with flexible content blocks, system prompts, and tool use with your own connection.

Create Chat Completion

Generate a complete, non-streaming OpenAI-compatible chat response.

Create Embeddings

Create vector embeddings for one text or a batch of texts with a selected embedding model.

Create Response

Generate one complete, non-streaming OpenAI Responses-compatible result from text or structured input, preserving reasoning and tool items.

Delete File

Permanently delete a caller-owned or explicitly authorized project file.

Discover Models

Return one model's full live capabilities by ID, or browse a compact, bounded view of the live model catalog using local capability filters.

Get Account and Credits

Return the connected user, project, organization, purchased and bonus credit balances, funding mode, and balance gating in one account-status read.

List or Get Batches

Return one asynchronous batch and its latest lifecycle, token, and cost status by ID, or one provider-default page of project batches when no batch ID is supplied.

List or Get Files

Return metadata for one project file by ID, or one provider-default page of project file metadata when no file ID is supplied.

Submit Batch

Create an asynchronous batch from an existing purpose=batch file ID, or upload a JSONL input file with purpose=batch and create the batch in one call.

SETUP GUIDE

Connect LLM API MCP Tool with your Agent

1

Install Composio

typescript
npm install @composio/core ai @ai-sdk/mcp @ai-sdk/openai
Install the Composio SDK and your agent framework
2

Create a session with MCP enabled

typescript
import { Composio } from "@composio/core";

const composio = new Composio();
const { mcp } = await composio.create("your-user-id", {
  toolkits: ["llm_api"],
  mcp: true,
});
Create a session scoped to LLM API and read its MCP URL and headers
3

Connect your agent to the MCP server

typescript
import { createMCPClient } from "@ai-sdk/mcp";
import { openai } from "@ai-sdk/openai";
import { generateText, stepCountIs } from "ai";

const client = await createMCPClient({
  transport: { type: "http", url: mcp.url, headers: mcp.headers },
});

const { text } = await generateText({
  model: openai("gpt-5.6-sol"),
  tools: await client.tools(),
  prompt: "Generate an embedding for the text: 'Composio connects AI agents to business tools.'",
  stopWhen: stepCountIs(10),
});

console.log(text);
await client.close();
Pass the session's MCP URL and headers to your agent and run a LLM API request
SETUP GUIDE

Connect LLM API API Tool with your Agent

1

Install Composio

typescript
npm install @composio/core @composio/openai openai
Install the Composio SDK, the OpenAI provider, and the OpenAI SDK
2

Create a Composio session

typescript
import OpenAI from "openai";
import { Composio } from "@composio/core";
import { OpenAIResponsesProvider } from "@composio/openai";

const composio = new Composio({ provider: new OpenAIResponsesProvider() });
const client = new OpenAI();

const session = await composio.create("your-user-id", { toolkits: ["llm_api"] });
const tools = await session.tools();
Initialize Composio with the OpenAI Responses provider and create a session scoped to LLM API
3

Run LLM API tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Generate an embedding for the text: 'Composio connects AI agents to business tools.'" }],
});

while (response.output.some((o) => o.type === "function_call")) {
  const outputs = await composio.provider.handleToolCalls(session, response.output);
  response = await client.responses.create({
    model: "gpt-5.6-sol",
    tools,
    previous_response_id: response.id,
    input: outputs,
  });
}

console.log(response.output_text);
Send a request, execute the LLM API tool calls through the session, and print the final answer

Why Use Composio?

AI Native LLM API Integration

  • Supports both LLM API MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable tool execution
  • Rich coverage for text, embeddings, images, audio, video, files, and batch workloads

Managed Auth

  • Secure API key handling without hard-coding credentials in your agent
  • Central place to manage, scope, and revoke LLM API access
  • Per user and per environment credentials for safer deployments

Agent Optimized Design

  • Tools are tuned using real error and success rates to improve reliability over time
  • Comprehensive execution logs so you always know what ran, when, and on whose behalf

Enterprise Grade Security

  • Fine-grained RBAC so you control which agents and users can access LLM API
  • Scoped, least privilege access to LLM API resources
  • Full audit trail of agent actions to support review and compliance

Rolling this out across your team?

Give your team centralized access control across every framework with Composio’s MCP Gateway.

EXPLORE MCP GATEWAY
FAQ

Frequently asked questions

Yes, LLM API requires you to configure your own API key. Once set up, Composio handles secure credential storage and API request handling for you.

Yes! Composio's Tool Router enables agents to use multiple toolkits. Learn more.

Yes. Composio is SOC 2 Type II compliant and is built to keep your LLM API connection and credentials secure. OAuth tokens and API keys are encrypted, and sensitive customer data is protected at rest and in transit.

Composio also undergoes independent security testing and continuously monitors its systems for security threats. You can review the latest reports and policies in the Composio Trust Center.

Composio maintains and updates all toolkit integrations automatically, so your agents always work with the latest API versions.

Create the key in your LLM API account settings, then paste it once on Composio's connection page. Composio stores it encrypted and uses it only for the LLM API actions your agent runs. Nobody else in your workspace can read it, and you can revoke it inside LLM API at any time.

When you connect a LLM API account through Composio, every action runs under that account, so anything the agent creates, sends, or changes shows up in LLM API as done by you. Keep an approval step in your prompt for actions with side effects, such as sending or deleting, and have the agent draft first.

Whatever the credentials you connect allow inside LLM API. If LLM API lets you scope a key to specific permissions, create a scoped one so the agent can only do what you intend. You can revoke the key inside LLM API at any time.

Yes. Composio supports multiple connected accounts for the same app, and that works in Claude, ChatGPT, or any other assistant you connect through Composio. Give each LLM API connection a name such as work or personal, and the assistant uses the one you mention in the request. Each account keeps its own credentials and nothing is merged.

The connection stops working the moment LLM API rejects the old key. Create a new key in LLM API and reconnect the account from the Composio dashboard or by asking your agent to reconnect LLM API. Nothing else changes.

Composio's free Hobby plan includes 100,000 tool calls per month with no credit card, which covers most personal LLM API use. Paid plans add higher limits and team features. Your LLM API plan and its API limits still apply as usual.

Built-in connectors usually give one AI access to a limited set of apps. Many people use Composio because it lets their AI connect to more apps than it normally supports, or connect to multiple accounts for the same app (e.g. connect Claude to multiple LLM API accounts).

With Composio, you connect LLM API once and then use it across different AI assistants without setting it up separately in each one. Connect your apps to Composio once, then connect Composio to whichever AI you use, whether that's Claude, ChatGPT, Hermes, or your own custom assistant.

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