> ## Documentation Index
> Fetch the complete documentation index at: https://docs.guile.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Metadata overview

> Discover which API operations this deployment implements

Use the Metadata API at startup when a client needs the list of operations this
deployment actually serves. That list is the capability map for feature detection.

## What you do first

1. [List implemented API operations](/api-reference/metadata/list-implemented-api-operations)
   once per session or build, then gate UI on the operation ids you require.

## States that matter

The response is a snapshot of this deployment. If an operation is absent, treat
it as unavailable here even if the public docs describe it.

## When a call fails

Failures come back as problem documents. Open the `type` link for the cause,
the fix, and whether retrying is safe. Auth failures mean you called without a
usable token; retry after [Authentication](/api-reference/Authentication/overview).

## Related paths

* Downloads of the OpenAPI definition live under [Artifacts](/api-reference/artifacts).
* Domain behavior still starts from each domain overview in the sidebar.