> ## 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.text.max_graphemes

> Bluesky caps post text at 300 graphemes. Emoji and ZWJ sequences count as 1.

## What it checks

`countGraphemes(text) <= 300`. The grapheme counter uses Unicode segmentation, so `👨‍👩‍👧‍👦` is one grapheme, not seven codepoints.

## Why 300

The cap matches Bluesky's `app.bsky.feed.post` schema constant, which is itself defined in graphemes — not bytes, not codepoints, not UTF-16 codeunits. We use the same counter the platform uses, so what passes preflight passes upstream.

## Failure response

```json theme={"system"}
{
  "error": {
    "code": "preflight_failed",
    "rule": "bluesky.text.max_graphemes",
    "platform": "bluesky",
    "message": "Post text is 312 graphemes; Bluesky allows at most 300.",
    "remediation": "Shorten the post to 300 graphemes or fewer."
  }
}
```

## Remediation

Trim the post. If you're truncating programmatically, **use a grapheme-aware splitter**. JavaScript's `string.length` counts UTF-16 codeunits and will under-count emoji; use `Intl.Segmenter` or `graphemer`.

```ts theme={"system"}
import Graphemer from "graphemer";
const g = new Graphemer();
const truncated = g.splitGraphemes(text).slice(0, 300).join("");
```

## Related

* [`bluesky.text.non_empty`](/preflight/bluesky-text-non_empty)
* [Platforms / Bluesky](/platforms/bluesky)