Localazy MCP server

Read Localazy projects, files, keys and glossary; submit translations, import keys, AI suggestions. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect Localazy50 free tool calls a month

What can I ask?

Turn on the Localazy connector, then ask in plain words. The AI picks the tools.

Which projects do I have, and which files are in my app project?
Show the French translations of the strings in my main app file.
What machine translation suggestions exist for the string 'Add to cart' in German?
Which terms are in our glossary for the app project?

What you can do with Localazy in Claude and ChatGPT

For software teams who translate the strings of their app with Localazy.

See your projects and the files in a project

The AI lists the projects you can reach with source language and your role, and the files inside a project.

Read the translations of a file in one language

The AI reads the strings of one file in one language, with key path and current translation, including plural forms. You can check wording or find gaps.

Get translation suggestions for a string

The AI reads translation memory and machine translation suggestions for one source key in a target language, for example to compare engines.

Read, add or update glossary terms

The AI lists the glossary terms of a project with the term in each language, adds a term, or replaces the content of an existing one.

Changes data

Submit a translation for a string

The AI sets the translation of one source key in one target language. Depending on your role, it becomes the current version or a suggestion.

Changes data

Add or update string keys in a file

The AI adds or updates up to 50 string keys in one file and one language, and checks the progress of the import. Nothing is deleted.

Changes data

How do I connect Localazy?

Before you connect

The login page asks for your Localazy project token.

Create it at localazy.com/developer/tokens (project owners only). A project token reaches that one project with read and write access, so the translation, glossary and import tools act as that project. Your token is used only to call the Localazy API on your behalf; it is never shown to anyone.

Claude claude.ai · Desktop

Open Customize → Connectors, then click + Add → Add custom connector.
Enter the name Localazy and this URL, then click Add:
https://localazy.usefulapi.io/mcp
Claude opens the login page: enter your Localazy project token.
In a chat, click + → Connectors and turn on Localazy.

Team and Enterprise: an Owner adds the connector for the organization first.

ChatGPT chatgpt.com

Open Plugins, click +, then Add custom MCP server.
Enter the name Localazy and this URL, choose OAuth as the authentication, confirm the warning and create it:
https://localazy.usefulapi.io/mcp
ChatGPT opens the login page: enter your Localazy project token.
In Plugins, install Localazy, then choose it in a chat.

No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.

Claude Code

Run this command, then run /mcp in Claude Code to log in:

claude mcp add --transport http localazy https://localazy.usefulapi.io/mcp

Cursor

Add to Cursor or add this to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "localazy": {
      "url": "https://localazy.usefulapi.io/mcp"
    }
  }
}

VS Code

Add to VS Code or add this to .vscode/mcp.json:

{
  "servers": {
    "localazy": {
      "type": "http",
      "url": "https://localazy.usefulapi.io/mcp"
    }
  }
}

Codex

Run these commands. The second one opens the login page:

codex mcp add localazy --url https://localazy.usefulapi.io/mcp

codex mcp login localazy

Other clients

Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.

https://localazy.usefulapi.io/mcp

Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Localazy project token. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

Pricing

Plan	Price	Limit
Free	$0	50 tool calls / month
Proper organization	$9/mo · $90/yr	10,000 tool calls / month
Pro+per organization	$39/mo · $390/yr	100,000 tool calls / month

Each paid plan covers this Localazy server only. Ask your AI to run localazy_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with localazy_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with localazy_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

Tools 21

Show all 21 tools (the AI picks them for you)

Read only · 11

List projectslocalazy_list_projects
List the Localazy projects the token can reach (a project token reaches one project): id, slug, name, source language, your role and visibility. Optionally add owning-organization limits (keys used/available, feature flags) and per-language progress counts (active, review, current, translated, sourceChanged, needImprovement).
List import file typeslocalazy_list_import_formats
List the file types Localazy can store strings as (type id, name, support for plurals/arrays/structured keys). The `json` type is what localazy_import_keys uses.
List fileslocalazy_list_files
List the files in a project (id, name, type, optional path). Use a file id with localazy_get_file_keys to read its strings.
Get file keys and translationslocalazy_get_file_keys
Read the strings of one file in one language: key id, key path, current translation (a string, an array or a plural object keyed @one/@other). Pages of up to 1000 keys; pass `next` for the following page. Set extra_info for hidden/limit/deprecated/comment, no_content to list keys without text. Counts against the project's daily fetch cap.
List key links (duplicities)localazy_list_key_links
List links between duplicate source keys (key id, linked project id, linked key id), paged. Needs the Reviewer role.
List CDN metadata fileslocalazy_list_cdn_metadata
List the Localazy CDN release tags of a project and the URL of each tag's metadata file (languages, plural rules). Needs the Manager role.
Get import progresslocalazy_get_import_progress
Progress of an import batch started with localazy_import_keys (pass its `import_batch`). The endpoint is used by Localazy's own API client but is not in the public docs yet, so the reply is returned as Localazy sends it.
Get translation memory suggestionslocalazy_get_tm_suggestions
Translation Memory suggestions for one source key into a target language: earlier translations of the same text, with the project they came from. Free; no Localazy credits.
Get machine translation suggestionslocalazy_get_mt_suggestions
Machine Translation suggestions (one per engine) for one source key into a target language. Free: it does not consume Localazy credits (Localazy AI does; see localazy_translate_with_ai). The first request for a key can be slower. Nothing is saved.
List glossary termslocalazy_list_glossary
All glossary terms of a project: id, description, translate/case-sensitive/exact-match flags and the term in each language.
Get glossary termlocalazy_get_glossary_term
One glossary term by id.

Changes data · 6

Create glossary termlocalazy_create_glossary_term
WRITE: add one term to a project's glossary (max 1,000 terms per project). Needs the Reviewer role. The term guides translators and Localazy AI from now on.
Update glossary termlocalazy_update_glossary_term
WRITE: replace the content of one glossary term (the term list and any flags you pass overwrite the old values). Needs the Reviewer role. Read the term first with localazy_get_glossary_term.
Submit a translationlocalazy_submit_translation
WRITE: set the translation of ONE source key in ONE target language. Reviewers, managers, owners and trusted translators set it as the current version (it overwrites the existing translation and goes live in the next download/CDN release); a translator's value is stored as a candidate for review. Values are stored as-is, with no placeholder, plural or length check, and the source language cannot be written. Check the reply's `stored`.
Import a few keyslocalazy_import_keys
WRITE: add or update up to 50 string keys in ONE file, in ONE language (flat key -> text; use a key like "home.title" for the key name). Needs the Owner role. Nothing is deleted or deprecated, and Localazy does not overwrite existing current translations by default (translations identical to the source are skipped). By default the language is the project's source language, so this adds new source keys or changes the source text of existing ones (which marks their translations as changed); pass a different language to import translations, optionally through review with import_as_new. Imports count against the project's daily import cap (Free plan: 100/day). Returns an import_batch id for localazy_get_import_progress.
Update key comment/limit/visibilitylocalazy_update_key_properties
WRITE: change a source key's translator comment, maximum translation length, or hidden flag (fields you omit stay as they are). Needs the Manager role. It does not change texts and cannot deprecate or delete the key.
Translate texts with Localazy AI (spends credits)localazy_translate_with_ai
COSTS CREDITS: translate up to 10 texts with Localazy AI. Every call consumes Localazy credits from the account balance, by the number of translated words (see localazy.com/pricing); nothing is stored in the project, the translations are only returned. Limits: 10 requests/minute, 32 items and 16,384 characters per request. Beta. Needs the Owner role.

Your usefulapi plan · 4

Usage status (free-tier meter)localazy_usage_status
Report the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter.
Request a missing featurelocalazy_request_feature
Tell usefulapi that the user needs something the Localazy tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter.
Upgrade to Pro or Pro+localazy_upgrade
Get a paid plan for Localazy (the free tier caps monthly usage). Pro: 10,000 tool calls a month, for normal use — plan "monthly" ($9/month) or "yearly" ($90/year, 2 months free). Pro+: 100,000 tool calls a month, for automations and heavy use — plan "plus" ($39/month) or "plus_yearly" ($390/year). Without a plan it returns both Pro and Pro+, each with a payment link, for the user to choose; with a plan, one link. An existing Pro subscription changes to Pro+ in place: call without confirm first, as the reply states the exact charge for this account (the price difference for the rest of the period, or in a free Pro trial the full Pro+ price, as the trial ends); then call with confirm: true. Cancel any time: the plan then runs to the end of the paid period, so it also suits a one-time job. A link opens Stripe Checkout in the browser; after payment the account upgrades automatically. Does not count against the meter.
Cancel the Pro subscriptionlocalazy_cancel_subscription
Cancel the caller's Localazy Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run localazy_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with Localazy in Claude or ChatGPT?

See your projects and the files in a project. Read the translations of a file in one language. Get translation suggestions for a string. Read, add or update glossary terms. Submit a translation for a string. Add or update string keys in a file. See what you can do for the details.

Is this an official Localazy product?

No. usefulapi is an independent service. It is not affiliated with or endorsed by Localazy. The server calls the Localazy API with your own Localazy access, so it sees only the data that your account can see.

Can I connect Localazy to Claude or ChatGPT?

Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.

What do I need to connect?

The login page asks for your Localazy project token. See Before you connect for where to find it.

Do I put my Localazy key or an Authorization header in the client config?

No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Localazy project token. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

How do you keep my Localazy credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Localazy API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in Localazy.

Can the AI change my Localazy data?

Yes, if you approve it. 6 of the 17 Localazy tools can create or change data. The other 11 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.

What does it cost?

The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this Localazy server only. Cancel any time: your paid plan then runs to the end of the paid period. Run localazy_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run localazy_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run localazy_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a Localazy tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with localazy_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.

Which AI clients can I use?

Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.

This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.

Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.

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