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

# bluesky.media.alt_text_max_graphemes

> Alt text caps at 2000 graphemes per media item.

## What it checks

`countGraphemes(item.altText) <= 2000` for every media item that supplies `altText`.

## Why

Bluesky's `app.bsky.embed.images#image` schema's `alt` field is documented at 2000 graphemes. Same Unicode segmentation as the post-text rule.

## Failure response

```json theme={"system"}
{
  "error": {
    "code": "preflight_failed",
    "rule": "bluesky.media.alt_text_max_graphemes",
    "platform": "bluesky",
    "message": "Alt text is 2400 graphemes; Bluesky allows at most 2000.",
    "remediation": "Shorten alt text to 2000 graphemes or fewer."
  }
}
```

## Remediation

Tighten the description. Alt text is for accessibility — it should describe the image's content concisely, not act as a hidden caption.

## Related

* [`bluesky.text.max_graphemes`](/preflight/bluesky-text-max_graphemes) — same Unicode counter.