Narrate every new Ghost blog post into an audio edition

Every hour, find Ghost blog posts that were published since the last run and turn each one into a narrated MP3 audio edition that my readers can listen to alongside the written post.

Trigger: cron, every hour.

Step 1 — Find new posts. Use Ghost Browse Posts (Admin API), filtered to status:published and published_at greater than the last run, sorted oldest first so I work through them in order. For each post, also keep the title, slug, full HTML body, and published_at.

Step 2 — Skip posts already processed. Before narrating, call Google Drive List Files against the configured target folder and search for a file whose name starts with the post slug (for example name contains '<slug>' and '<folderId>' in parents and trashed = false). If a match exists, skip that post.

Step 3 — Clean the body for narration. Strip elements that do not narrate well: image captions and figure alt text, footnote markers, raw URLs, code fences and inline code, embed blocks, and obvious call-to-action / subscribe-now / 'read more' blocks. Keep the post title (read it once at the start) and the body prose. Decode HTML entities and collapse repeated whitespace.

Step 4 — Narrate with ElevenLabs Text to Speech. Use one configurable voice_id for every post so all audio editions sound like the same narrator, the eleven_multilingual_v2 model, and a single output_format (default mp3_44100_128). If the cleaned text is longer than about 9,000 characters, split it on sentence boundaries into chunks under that cap, call Text to Speech once per chunk keeping voice_id, model_id, and output_format identical across chunks, then concatenate the returned MP3 bytes in order so the final audio plays as one continuous track without audible seams.

Step 5 — Save to Google Drive. Upload the final MP3 to a configurable Google Drive folder using Upload File (Multipart). Name the file using the post slug (for example <slug>.mp3) so the dedupe check in Step 2 keeps working. Make the file shareable to anyone with the link and capture the shareable URL for the next step.

Step 6 — Announce in Slack. Use Slack Bot Send a Message to post into a configurable channel. The message should include the post title, the public Google Drive link to the audio, and a short ready-to-copy blurb (one or two sentences) the social team can paste straight into LinkedIn or X to announce the audio edition.

Configurable inputs: the Ghost site, the target Google Drive folder ID, the target Slack channel, the ElevenLabs voice ID, and optionally an override for the announcement blurb tone.