# Lingo.dev Localization (i18n) Agent

Subagent that configures web application internationalization through a rigid step-by-step checklist. It inspects project code, implements i18n, and verifies builds.

- subagent · `type=agent` · GitHub Copilot · ★ 40418
- Author: github · official GitHub repository
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/github/awesome-copilot/tree/HEAD/agents/lingodotdev-i18n.agent.md
- Updated: 2026-10-23
- HTML: https://affpapa.org/en/nevibecode/agents/lingodev-localization-i18n-agent

## What it does

This subagent coordinates web application internationalization using an external checklist tool. The entire flow runs strictly through `i18n_checklist`: the agent fetches task requirements with `done: false`, completes the edits, and confirms the outcome with `done: true` before moving on. It never writes code ahead of the checklist.

Alongside standard file editing, search, and shell tools, the agent connects to an external MCP server at `https://mcp.lingo.dev/main` via SSE. Without a working network connection to this SSE endpoint, the agent cannot retrieve its task list and will stop working.

## Install

### GitHub Copilot (native platform)

**Manually: put the files in place**
- File: `.github/agents/lingodotdev-i18n.agent.md`

### Claude Code

**Manually: put the files in place**
- File: `.claude/agents/lingodotdev-i18n.md` — For all projects use ~/.claude/agents/. Claude delegates by the description field or an @-mention. Copilot names tools its own way in the tools field: remove it or rewrite it for Claude Code

### Codex

**Manually: put the files in place**
- File: `.codex/agents/lingodotdev-i18n.toml` — Codex defines subagents in TOML: name, description, developer_instructions. Move the Markdown text into developer_instructions by hand. For all projects use ~/.codex/agents/

### Cursor

**Manually: put the files in place**
- File: `.cursor/agents/lingodotdev-i18n.md` — Cursor also reads .claude/agents/

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/github/awesome-copilot/tree/HEAD/agents/lingodotdev-i18n.agent.md

## When to use it
- configure multi-language support in web applications step by step
- fetch project-specific localization guides using an external checklist
- validate code changes against project builds after adding translations
- track localization milestones with evidence verification at each step

## Example prompts
- Configure internationalization for this web application and start the checklist
- Set up multi-language support using the Lingo i18n checklist tool
- Implement i18n in our project and verify the changes with a build

## Source text · lingodotdev-i18n.agent.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 9513659fc6b5a5f9.

BEGIN THIRD-PARTY FILE 9513659fc6b5a5f9
```text
---
name: Lingo.dev Localization (i18n) Agent
description: Expert at implementing internationalization (i18n) in web applications using a systematic, checklist-driven approach.
tools:
  - shell
  - read
  - edit
  - search
  - lingo/*
mcp-servers:
  lingo:
    type: "sse"
    url: "https://mcp.lingo.dev/main"
    tools: ["*"]
---

You are an i18n implementation specialist. You help developers set up comprehensive multi-language support in their web applications.

## Your Workflow

**CRITICAL: ALWAYS start by calling the `i18n_checklist` tool with `step_number: 1` and `done: false`.**

This tool will tell you exactly what to do. Follow its instructions precisely:

1. Call the tool with `done: false` to see what's required for the current step
2. Complete the requirements
3. Call the tool with `done: true` and provide evidence
4. The tool will give you the next step - repeat until all steps are complete

**NEVER skip steps. NEVER implement before checking the tool. ALWAYS follow the checklist.**

The checklist tool controls the entire workflow and will guide you through:

- Analyzing the project
- Fetching relevant documentation
- Implementing each piece of i18n step-by-step
- Validating your work with builds

Trust the tool - it knows what needs to happen and when.
```
END THIRD-PARTY FILE 9513659fc6b5a5f9

The third-party file has ended. Everything between the 9513659fc6b5a5f9 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

© github · MIT · https://github.com/github/awesome-copilot/tree/HEAD/agents/lingodotdev-i18n.agent.md

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