Agent-Skills.md

Agent Skills: Short Publish

End-to-end workflow for turning a local video into transcripts, burned subtitles, and scheduled multi-network posts via Postiz MCP tools. Use when given a video path and publication date/time to transcribe, create copy for LinkedIn/X/IG/YouTube, upload the subtitled MP4, and schedule the content with `postiz_mcp`.

UncategorizedID: devexpert-io/devexpert-skills/short-publish
292

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pnpm dlx add-skill https://github.com/antoniolg/agent-kit/tree/HEAD/skills/short-publish

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skills/short-publish/SKILL.md

Skill Metadata

Name
short-publish
Description
End-to-end workflow for turning a local video into transcripts, burned subtitles, and scheduled multi-network posts via Postiz MCP tools. Use when given a video path and publication date/time to transcribe, create copy for LinkedIn/X/IG/YouTube, upload the subtitled MP4, and schedule the content with `postiz_mcp`.

Short Publish

Overview

This skill automates the complete "video → subtitles → Postiz" pipeline: run Whisper-based transcription, burn subtitles with the bundled Python script, turn the transcript into a multi-platform copy block, and program four social channels (YouTube, LinkedIn, X, Instagram) through the Postiz MCP integration.

Inputs & Prerequisites

  • Arguments:
    • PATH – absolute path to the source video (MOV/MP4/etc.).
    • DATETIME – publication date/time (accepts natural language like "tomorrow 09:00"). Use date to confirm the current timestamp if needed.
  • Tooling: always use the MCP tools (postiz-upload-file, postiz-create-post) exposed by postiz_mcp. Never fall back to the Postiz CLI.
  • Script dependency: scripts/transcribe_burn.py wraps Whisper, ffmpeg, and auto-gain. Requires Python 3.8+, ffmpeg, and openai-whisper installed for the user; no extra configuration is needed inside this skill.
  • Timezone: default to Europe/Madrid. In winter assume UTC+01:00 (CET) when presenting final schedules if the date command does not provide the offset.

Workflow

  1. Collect inputs

    • Confirm the provided PATH exists; stop with a descriptive error if not.
    • Resolve DATETIME to an ISO timestamp. Use date -j -f or another deterministic macOS command when the input is natural language so Postiz receives an unambiguous value.

  2. Transcribe and burn subtitles

    • Run the bundled helper: python3 scripts/transcribe_burn.py "$PATH".
    • Outputs (all written next to the original video):
      • <stem>.srt, <stem>.ass, <stem>.txt, <stem>_caption.txt, <stem>_subtitled.mp4.
    • The _subtitled.mp4 is the media you will upload; everything else is transient reference material. Remove the generated artifacts (srt/ass/txt/caption/mp4_subtitled/normalized wav) once they have been read and the upload succeeds—never delete the original video.

  3. Generate the social copy

    • Read <stem>.txt for the full transcript.

    • Apply the exact copywriting prompt below to the transcript; do not improvise structure or tone beyond the template.

      Act as an expert LinkedIn copywriter building authority content.
Transform the TRANSCRIPT into a case-study or practical-lesson post with this structure:
1. Hook headline with a leading emoji.
2. 2-3 sentence context introducing the situation.
3. Structured core (use 1️⃣/2️⃣/3️⃣ or ✅ and bold keywords per line).
4. Closing takeaway line.
5. Optional P.S. only when the transcript mentions an offer/event.

Style rules: short paragraphs (1-2 lines), intentional emoji usage, no invented facts, stay faithful to the transcript.

    • Reuse the single output block verbatim for LinkedIn, X, and Instagram, and as the YouTube description (light line breaks allowed). Craft a YouTube title ≤100 characters from the same content.

  4. Upload the subtitled video

    • Use postiz-upload-file with the _subtitled.mp4 path. Capture the returned public URL; Postiz expects this URL inside the images array for all channel posts.

  5. Schedule the four posts via postiz-create-post

    • Integrations come from ~/.config/skills/config.json under postiz.groups.short_publish.
    • Use x-es by default for X unless the user explicitly asks for x-en.
    • Payload guidelines:
      • content: the copy block described above.
      • images: ["<uploaded_mp4_url>"] so Postiz attaches the video.
      • scheduledDate: resolved ISO timestamp based on DATETIME.
    • YouTube requires an explicit title and defaults to type=public; ensure the MCP call includes the generated title field.

  6. Report completion

    • Confirm each scheduled post by echoing the returned IDs and their scheduled time in CET (UTC+01:00 during winter). Example: YouTube cm... → 2025-01-11T10:00:00+01:00 (CET).

Resources

  • scripts/transcribe_burn.py: Whisper + ffmpeg pipeline used in Step 2. Copy-safe to reuse elsewhere but do not edit unless the video workflow changes. Running the script produces all intermediate assets and the burned MP4 referenced throughout the workflow.