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Build your own skill: from a workflow you liked to a custom SKILL.md

7 min readAdvanced/skill-creator
Film Movie StudioRender
Habit Tracker — Mobile AppNew project
Search skills…
AllWorkflowsQuick
video
Short DramaViral vertical mini-series, end to end.
image
Image CreatorGenerate single images from a prompt.
audio
Audio StudioVoiceover, SFX and music tracks.
copy
App BuilderMulti-screen apps with live preview.
image
E-commerce DesignPro product shots for any platform.
video
Music VideoBeat-synced clips cut to your track.

Every skill in the app is a single SKILL.md file: YAML frontmatter plus numbered stages in prose. The model that runs a skill sees only that file and the app's tool catalog — so it has to be self-contained and accurate. /skill-creator is a meta-tool for power users: it takes the workflow that just happened on your canvas (or an idea you describe) and scaffolds a complete SKILL.md against the real tool catalog. The app won't install the skill for you — the deliverable is a polished document you install by hand via the Hub. In this guide we run the whole loop: from source material through a review round to installation.

What you'll need

  • FilmMovie Studio installed with at least one generation provider configured.
  • A workflow that worked for you — ideally a finished loop already on the canvas you want to repeat, or a clear idea for a new one.
  • A basic grasp of what the tools do (generate_image, generate_video, generate_audio, render_timeline and so on).

Step by step

  1. 1

    Run /skill-creator

    In the chat box, type /skill-creator and confirm. The skill author opens — it understands you're authoring a workflow, not generating media. It works best right after you've nailed a loop on the canvas, while it's still fresh.

    Film Movie StudioRender
    Habit Tracker — Mobile AppNew project
    Skills
    /skill-creator
    /short-drama
    /image-creator
    /audio-studio
    /app-builder

    /skill-creator iOS app icon, 1:1, for a habit tracker app called "Streaks". A bold minimal mark: a stylized flame merging with an upward check/streak line, indigo #6366F1 to violet…

    SkillsModels

    Type / to switch skills anytime

    Tip: The best skills come from a workflow you've already run by hand once. Dial the idea in via chat first, then capture it.
  2. 2

    Pick the source: from session or from an idea

    The app asks what to build the skill from. "From this session" — it reads the canvas (list_canvas_nodes) and reconstructs which tools ran and in what order. "From an idea" — it opens a short brief (ask_user_brief) where you describe the goal, inputs and media types.

    Film Movie StudioRender
    Habit Tracker — Mobile AppNew project
    Search skills…
    AllWorkflowsQuick
    video
    Short DramaViral vertical mini-series, end to end.
    image
    Image CreatorGenerate single images from a prompt.
    audio
    Audio StudioVoiceover, SFX and music tracks.
    copy
    App BuilderMulti-screen apps with live preview.
    image
    E-commerce DesignPro product shots for any platform.
    video
    Music VideoBeat-synced clips cut to your track.
  3. 3

    Confirm the workflow reconstruction

    If you chose the session, the app shows the workflow in 3–5 bullet points: which tools ran, what it asked you, where the creative decisions were. Check the order and fill in anything missing — this is the skeleton of your future skill.

    Film Movie StudioRender
    Habit Tracker — Mobile AppNew project
    frame_01.png
    Remix
    Variations
    Add to timeline
    Fullscreen
    Delete
  4. 4

    Let it scaffold the SKILL.md

    The app writes a complete SKILL.md: YAML frontmatter (name, slug, version, description with trigger phrases, category, agent_type) and numbered stages with concrete tool calls in backticks. The finished document drops onto the canvas as a "<slug> — SKILL.md" card.

    Film Movie StudioRender
    Habit Tracker — Mobile AppNew project

    Drag an image here, or click to upload

    reference.png
    Tip: Keep every generation prompt in the skill in English, and never reference a tool outside the catalog — that's the #1 reason a generated skill breaks.
  5. 5

    Run the review round

    The app summarizes the skill in three lines and offers a choice (ask_user_choice): install as-is / revise something / add a stage. Request revisions and the app rewrites the card on the canvas (update_canvas_node) until you're satisfied.

    Film Movie StudioRender
    Habit Tracker — Mobile AppNew project
    60%
    prompt
    frame_01.png
    Generating… 42%
    Remix
    frame_02.png
    Generating… 68%
    Remix
    frame_03.png
    Generating… 55%
    Remix
    frame_04.png
    Generating… 80%
    Remix
    output
  6. 6

    Open the Hub and install the skill

    Copy the markdown from the card (copy-text button). Open Hub → Install Skill → paste the markdown and confirm. Alternatively, save the document as a file and use Install from file.

    Film Movie StudioRender
    Habit Tracker — Mobile AppNew project
    Search skills…
    AllWorkflowsQuick
    video
    Short DramaViral vertical mini-series, end to end.
    image
    Image CreatorGenerate single images from a prompt.
    audio
    Audio StudioVoiceover, SFX and music tracks.
    copy
    App BuilderMulti-screen apps with live preview.
    image
    E-commerce DesignPro product shots for any platform.
    video
    Music VideoBeat-synced clips cut to your track.
  7. 7

    Run it from your own slash command

    Once installed, the skill appears in the slash menu as /<your-slug>. Run it on a fresh project and verify it does exactly what the original workflow did. Editing later = reinstalling an updated markdown under the same slug.

    Film Movie StudioRender
    Habit Tracker — Mobile AppNew project
    Skills
    /skill-creator
    /short-drama
    /image-creator
    /audio-studio
    /app-builder

    /skill-creator iOS app icon, 1:1, for a habit tracker app called "Streaks". A bold minimal mark: a stylized flame merging with an upward check/streak line, indigo #6366F1 to violet…

    SkillsModels

    Type / to switch skills anytime

    Tip: One skill per run. To capture a second workflow, run /skill-creator again.

What you get

From a workflow you'd dialed in, you now have your own reusable skill: a self-contained SKILL.md installed in the Hub and available in the slash menu under your own command. Instead of repeating the same steps by hand, you now run your workflow with a single command — and tweak it any time by reinstalling an updated markdown under the same slug.

Pro tips

  • Keep the skill self-contained: no references to external files, databases or URLs it can't reach at runtime.
  • Fill the frontmatter with sharp trigger phrases — they're what the app later uses to suggest the skill when you type a similar idea.
  • Always end video-producing skills with a single render_timeline call; keep intermediate outputs as cards on the canvas.

Try it yourself

FilmMovie Studio is a desktop app that walks you from idea to finished export. Download it and start creating.

Get FilmMovie Studio

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