Castingwords MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Castingwords MCP or direct API to upload audio files, check transcription job status, fetch finalized transcripts, and manage your transcription queue through natural language.

Castingwords logoCastingwords
Api Key

CastingWords is a transcription service specializing in human-powered, accurate transcripts via a simple API. Get seamless audio-to-text conversion for interviews, meetings, podcasts, and more.

9 Tools

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TOOL ROUTER PLAYGROUND
Castingwords
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TOOLS

Supported Tools

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

Cancel and Refund Audio File

Tool to cancel an ordered audio file and issue a refund if applicable.

Get Prepay Balance

Tool to retrieve the current prepay balance for the account.

Get Transcript

Tool to retrieve the transcript for a given audiofile in the requested format (txt, doc, rtf, or html).

Get registered webhook URL

Tool to retrieve the currently registered webhook URL for account notifications.

Order Transcript

Create a transcription order for audio/video files at publicly accessible URLs.

Order Upgrades

Tool to order an upgrade for a specific audio file.

Register Webhook

Registers a webhook URL to receive CastingWords event notifications.

List Available SKUs

Retrieves all available CastingWords transcription service SKUs with pricing.

Test Webhook Call

Tool to request a test webhook call for a specific event type.

SETUP GUIDE

Connect Castingwords 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: ["castingwords"],
  mcp: true,
});
Create a session scoped to Castingwords 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: "Order a transcript for this podcast episode URL",
  stopWhen: stepCountIs(10),
});

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

Connect Castingwords 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: ["castingwords"] });
const tools = await session.tools();
Initialize Composio with the OpenAI Responses provider and create a session scoped to Castingwords
3

Run Castingwords tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Order a transcript for this podcast episode URL" }],
});

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 Castingwords tool calls through the session, and print the final answer

Why Use Composio?

AI Native Castingwords Integration

  • Supports both Castingwords MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable tool execution
  • Rich coverage for uploading audio, tracking jobs, and retrieving transcripts

Managed Auth

  • Built-in API key management with automatic rotation
  • Central place to manage, scope, and revoke Castingwords access
  • Per user and per environment credentials instead of hard-coded keys

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 Castingwords
  • Scoped, least privilege access to Castingwords 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, Castingwords requires you to configure your own API key credentials. 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 Castingwords 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 Castingwords account settings, then paste it once on Composio's connection page. Composio stores it encrypted and uses it only for the Castingwords actions your agent runs. Nobody else in your workspace can read it, and you can revoke it inside Castingwords at any time.

When you connect a Castingwords account through Composio, every action runs under that account, so anything the agent creates, sends, or changes shows up in Castingwords 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 Castingwords. If Castingwords 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 Castingwords 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 Castingwords 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 Castingwords rejects the old key. Create a new key in Castingwords and reconnect the account from the Composio dashboard or by asking your agent to reconnect Castingwords. Nothing else changes.

Composio's free plan includes 100,000 tool calls per month with no credit card, which covers most personal Castingwords use. Paid plans add higher limits and team features. Your Castingwords 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 Castingwords accounts).

With Composio, you connect Castingwords 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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