> This page is for Fern CLI.

> For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see https://buildwithfern.com/learn/llms.txt.

## 4.61.0

**`(feat):`** Add `--email` flag to `fern login` for enterprise SSO support.

## 4.59.0

**`(feat):`** Add support for pulling generator Docker images from custom container registries
during `fern generate --local` via a new `image: { name, registry }` field in
`generators.yml`. Custom image generators are blocked for remote generation and
skipped during auto-upgrade.

## 4.58.0

**`(feat):`** Support `x-fern-default` on `x-fern-global-headers` entries. When a
global header includes `x-fern-default`, the value is carried through
to the IR `clientDefault` field so generators can emit optional
parameters with a default value (e.g. `version: Optional[str] = '2024-02-08'`).

## 4.57.0

**`(feat):`** Add a `missing-redirects` docs validation rule to `fern check` that compares
the current docs navigation against the previously published markdown slug
table in FDR. The check warns when a published page is removed or moved
without a redirect in `docs.yml`, helping prevent broken historical docs URLs.
The rule also handles first-publish, unauthenticated, offline, and timeout
scenarios gracefully based on the configured check severity.

## 4.56.0

**`(feat):`** Add an `agents` config block to `docs.yml` for agent-serving endpoints.
`agents.page-directive` prepends custom instructions to each page served
through agent endpoints.