Canonical: https://agentmasterdata.com/use-cases/languages/

REFERENCE DATA FOR AGENTS

# Normalize language labels

A content agent labels a language code clearly when preparing multilingual content for review.

## When this fits

English display labels; no translation or language detection. A language label does not identify or translate the language of a document.

[Source, scope and usage terms](https://agentmasterdata.com/datasets/languages/)

## Check the current release

Read [the live schema](https://api.agentmasterdata.com/v1/master-data/schema), [readiness](https://api.agentmasterdata.com/readyz), and MCP `tools/list` before using `cldr-languages-en`. These instructions describe approved scope, not a promise that a particular deployment is available. Check [pricing](https://api.agentmasterdata.com/v1/pricing) and [attribution](https://api.agentmasterdata.com/legal/attribution). A promotional window may permit a free request; do not infer permission from `payments_enabled: false` alone.

## Make one bounded request

These commands send no wallet signature or payment proof and do not retry. A `402` response means stop and inspect the quote; it does not authorize spending. Check availability and terms first.

```
curl --fail-with-body --get 'https://api.agentmasterdata.com/v1/reference-data/cldr-languages-en' \
  --data-urlencode 'codes=en' \
  --data-urlencode 'include_inactive=true' \
  --data-urlencode 'limit=1'
```

The equivalent MCP call uses the same arguments:

```
curl --fail-with-body 'https://api.agentmasterdata.com/mcp' \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -H 'MCP-Protocol-Version: 2026-07-28' \
  -H 'Mcp-Method: tools/call' \
  -H 'Mcp-Name: get_reference_data' \
  --data '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"get_reference_data","arguments":{"domain":"cldr-languages-en","codes":["en"],"include_inactive":true,"limit":1}}}'
```

[Machine-readable arguments](https://agentmasterdata.com/examples/languages-request.json) · [Input schema](https://agentmasterdata.com/contracts/schemas/tools/get_reference_data.input.schema.json)

## Accept only supported results

Check `ok`, the returned domain and exact requested code. Keep the result envelope’s `meta.data_version`, source identifiers, licences, public-use terms and warnings. For MCP, inspect `structuredContent` and `isError`. Do not substitute a different domain or treat an empty result as a match.

`include_inactive: true` permits unknown-validity values. Preserve `active: null` and `reference_value_validity_unknown`; they do not establish that the value is currently active. Use `include_inactive: false` when the task requires known-active values.

## Handle an unavailable service

Stop on a challenge page, unavailable domain, unresolved terms, or payment refusal. For `429`, respect `Retry-After` within a bounded caller policy. The website records no execution or paid-service proof. [Read the complete connection guide](https://agentmasterdata.com/agent-guide).

[Agent guide](https://agentmasterdata.com/agent-guide) · [Live API schema](https://api.agentmasterdata.com/v1/master-data/schema)