SimpleLocalize MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with SimpleLocalize MCP or direct API to manage localization keys, update translations, list languages, import files, and export translation data through natural language.

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SimpleLocalize is a translation management platform for localization keys, translations, languages, imports, exports, and hosted environments. It helps teams ship multilingual apps faster with clean translation workflows and project-wide language control.

14 Tools

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TOOL ROUTER PLAYGROUND
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TOOLS

Supported Tools

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

Create Tag

Create a project tag for organizing translation keys.

Create Translation Key

Create one translation key and optional metadata in the connected project.

Create Translation Keys

Create up to 100 translation keys and report every rejected entry; valid entries may still be created when others fail.

Delete Tag

Permanently delete one project tag by its exact name.

Delete Translation Key

Permanently delete one translation key, including all translations attached to it, by exact key and namespace.

Export Translations

Create downloadable snapshot URLs for project translations in a selected file format.

Get Project Context

Return the connected project and its current languages, tags, and hosting environments so an agent can choose valid identifiers before managing translations.

Get Translation Key

Return full metadata for one translation key selected by key and namespace.

List Activity

Return a manually selected page of recent project changes for operational visibility.

List File Formats

Return the file formats currently accepted by SimpleLocalize exports, including multi-language, beta, and deprecation metadata.

List Translation Keys

Search translation keys and return one controllable page of provider summary fields.

List Translations

Search translations by key, language, text, review state, or namespace and return one page.

Set Translation

Set the text and optional review state for one existing translation key and language.

Set Translations

Set 1 to 100 translations in one request.

SETUP GUIDE

Connect SimpleLocalize 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: ["simple_localize"],
  mcp: true,
});
Create a session scoped to SimpleLocalize 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: "List all languages configured in my SimpleLocalize project",
  stopWhen: stepCountIs(10),
});

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

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

Run SimpleLocalize tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "List all languages configured in my SimpleLocalize project" }],
});

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

Why Use Composio?

AI Native SimpleLocalize Integration

  • Supports both SimpleLocalize MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable localization tool execution
  • Rich coverage for managing keys, translations, languages, imports, exports, and hosted environments

Managed Auth

  • Secure API key handling without hard-coding SimpleLocalize credentials in your agent code
  • Central place to manage, scope, and revoke SimpleLocalize access
  • Per user and per environment credentials, so dev, staging, and production stay cleanly separated

Agent Optimized Design

  • Tools are shaped so language models can understand SimpleLocalize actions and call them with the right inputs
  • Execution logs help you see which translation keys, languages, imports, or exports were touched
  • Built for real agent workflows where small localization updates need to be safe, repeatable, and easy to review

Enterprise Grade Security

  • Fine-grained RBAC so you control which agents and users can access SimpleLocalize
  • Scoped, least privilege access to SimpleLocalize localization projects and resources
  • Full audit trail of agent actions to support release reviews and compliance checks
FAQ

Frequently asked questions

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

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

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

With Composio, you connect SimpleLocalize 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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