DevMotion

Generate licensed instrumental background music, save it to the asset library, and add it as a music audio layer with sensible volume, fade, loop, and ducking defaults. Consumes plan AI credits and adds generated music to the saved public-preview project.

Transcribe audio/video to word-synced captions in a chosen look (sticker, bold, karaoke, punch, neon, story, minimal, subtitle). Creates a captions layer. Consumes plan AI credits and adds captions to the saved public-preview project.

Generate an image from a text prompt using AI. The result is saved to the asset library and added as an image layer. Consumes plan AI credits and adds the generated image to the saved public-preview project.

Synthesize text into speech via ElevenLabs TTS. Replaces the source audio layer content. Consumes plan AI credits and replaces the selected audio layer content in the saved project.

Generate a video from a text prompt using Seedance 2.0 AI, optionally conditioned on pinned start/end frames OR reference images/videos/audio (character, product, motion, style). Creates a video layer. Consumes plan AI credits and adds the generated video to the saved public-preview project.

Synthesize hits, booms, whooshes, risers and UI ticks at exact project times into one sound-effects layer (WAV, sample-accurate, so a hit at a cut is heard on that frame). Free and instant; it never ducks the music. Saves a synthesized sound-effects file in the authenticated user's asset library and adds an audio layer or overwrites the audio source, timing and settings of an existing audio layer with the same name in the saved public-preview project; it consumes no credits.

One-shot "Auto Captions Generator" template. Upload a video and get accurate auto-generated captions in seconds. Runs the full template headlessly: generates the required media server-side and lands the composed, editable layers in the project. Consumes plan AI credits and updates project settings and layers in the saved public-preview project.

One-shot "Video Translator" template. Dub your video into another language using AI voice cloning. Runs the full template headlessly: generates the required media server-side and lands the composed, editable layers in the project. Consumes plan AI credits and updates project settings and layers in the saved public-preview project.

One-shot "UGC Ad Generator" template. Your media in, creator-style ad out: reference photos, videos and audio (or pinned start/end frames), lip-synced spoken hooks, comparable takes, and everything lands as editable layers. Runs the full template headlessly: generates the required media server-side and lands the composed, editable layers in the project. Consumes plan AI credits and updates project settings and layers in the saved public-preview project.

One-shot "Long Video to Short" template. Turn a long video into a focused highlight story, with editable scenes, a suggested hook and vertical framing. Runs the full template headlessly: generates the required media server-side and lands the composed, editable layers in the project. Consumes plan AI credits and updates project settings and layers in the saved public-preview project.

Transcribe an audio or video layer to JSON: its text and every word with its start and end (seconds of the layer's own timeline). Changes nothing in the project; for a captions layer use the Generate Captions action instead. Consumes plan AI credits and only returns the transcript as JSON; it does not change the project.

Research a product URL, compare mobile and desktop captures, and produce a complete evidence-grounded UGC brief with angle, hook, visual beats, script, and start/end-frame prompts. Analysis only: it proposes the creative parameters for the UGC Ad Generator template but never generates the video and never fixes the generation settings — quality and resolution stay the model’s call. Consumes plan AI credits for the web research and page analysis and saves website research captures in the authenticated user's asset library; it does not generate a video or change the project.

Set the project name, size in px, duration in seconds, background (hex or gradient) or the export badge: exports carry a small "Made with DevMotion" badge that previews and inspect_frames do not show; move it off key content, or hide it where the plan includes watermark-free export. Returns the applied settings. Overwrites the supplied settings on the saved public-preview project.

Confirm a completed presigned upload. Registers the upload in the authenticated user's asset library; an invalid oversized upload is permanently removed.

Create a new animation project. In local mode, initialises the open project folder. Tip: call get_design_guide before composing scenes. Creates a saved project in the authenticated user's workspace with a publicly accessible preview URL.

Patch a layer's source in place (field "html", "css" or "scripts[N].code") by replacing a literal oldString copied verbatim from its line-numbered source block, without the "N | " prefix; the scene remounts and keeps its id. Returns the replacement count and the frames to inspect. oldString must match exactly once unless replaceAll; never rewrite or recreate a scene to change it. Overwrites matching source text; scripts run during preview, inspection, and rendering and may access external services.

Preview or run the generation of scene drafts and out-of-date scenes, referenced scenes first. Without planId it is a free preview: what will be generated, replaced or reused, any invalid or circular reference, and the total credits and time including dependencies; with the planId of that preview it runs exactly that plan, keeps each previous output until its replacement succeeds, and a retry after a failure runs only what is left. If the project changed since the preview, nothing runs and the new plan comes back. A run continues in the background and the project is saved after every finished step: call generate_scenes again without planId to see progress and the outcome, then check the result with inspect_frames. Without planId it only previews and changes nothing. With planId it consumes plan AI credits, adds generated media to the saved public-preview project and replaces the previous output of each regenerated scene once its new output exists.

DevMotion's design knowledge: call it with no topic once per session for the core guide (house style, workflow, need → tool map), then with a topic before building that kind of thing — "direction" before planning, "scene" before your first custom scene, "three" before any 3D. Returns markdown with the engine rules and copyable skeletons. Free and instant.

Read the project: settings, a layer index with time windows, the scenes with their generation nodes, and the full layer JSON. Scene source (html, css, scripts code) is included as line-numbered blocks only for the layers named in `sources` (or "all"): read exactly the layers you will patch with edit_layer_source. Only returns a project owned by the authenticated user.

Get the status of a render started with render_project. When status is "completed", output_url points to the finished MP4; when "failed", error_message explains why. This tool does not create a new export or consume another export slot. It can retrieve an existing render owned by the authenticated user even if their subscription later changes. Only returns a render job owned by the authenticated user.

Return the subtitle file (SRT or WebVTT) of a captions layer: its words grouped as the layer shows them, timed on the project timeline so it lines up with the rendered video. Pass captionsLayerId when the project has more than one captions layer. Only reads a project owned by the authenticated user; it does not change the project or consume credits.

Put several layers in a group so they move, scale and rotate together. Returns the group id. Creates a group and reparents the selected layers in the saved public-preview project.

Import media from a public URL. Downloads the public URL and saves a copy in the authenticated user's asset library.

LOOK at the rendered project — the only way to know how a frame really looks, since every mutation reports success whatever it draws: use it after each shot you write or change and before you call the work done. Returns images and a text summary from the export renderer: frames (1-4 times), sheet (up to 24 labelled times in ONE image; cuts: true adds both sides of every cut), region (full-resolution crop), measure (element/text metrics, text only) or scan (luma and frame-difference over a range, flagging blank frames, near-empty shot openings and jumps away from cuts), all snapped to the frame grid. Batch times into one call; a scan is capped at 300 frames and 30s per call. Executes scripts already stored in HTML layers while rendering; those scripts may access external services.

Insert one Scene Library block as an editable html layer, setting its typed controls with `values` in the same call (omit enterTime to append after the last scene, pass it to overlay an element or effect). Returns the new layer ids and the frames to inspect. Its source stays editable with edit_layer_source. Adds catalog scene source to the saved public-preview project; its scripts run during preview, inspection, and rendering.

List one page of the user's DevMotion projects, most recently updated first. Use nextPage to continue. Call this to discover an existing projectId before editing a project's layers instead of guessing IDs. Only lists projects owned by the authenticated user.

Search the Scene Library of ready-made, editable HTML+GSAP blocks by keywords and scope/role/medium/style, or pass `ids` to read their typed controls. Returns compact metadata and IDs for instantiate_block, never source. Free; page with offset.

List available text-to-speech voices (name, voiceId, traits). Call before action_generate_speech to pick a voiceId. Only lists voice metadata and does not synthesize speech.

Delete a layer by id or name. Returns the outcome; the agent cannot undo it. Permanently removes the selected layer from the saved public-preview project.

Start an async video render of an existing project. Returns a render ID immediately; the MP4 is produced in the background. Poll get_render with the returned ID to retrieve the output URL when the status becomes "completed". Optionally override width/height/fps for this render only (the saved project is not modified), or pass callback_url (on plans that include webhooks) to be POSTed a webhook when the render finishes. Each render uses one of the user's monthly MP4 exports. When the current DevMotion plan has no export left for it, nothing is rendered and the tool says so; the project stays saved, editable, inspectable and previewable. In the Local Studio the MP4 renders on this machine into renders/. Consumes monthly export quota, creates a hosted MP4, and may POST the result to the supplied callback URL.

Change visual stacking without recreating anything: before/after a sibling, or to the front/back of its current group. Group membership is unchanged. Changes layer stacking order in the saved public-preview project.

Change an installed block's exposed controls (text, colours, numbers, toggles) without touching its source; pass only what changes. Returns the merged values and the frames to inspect. Text driven by a control is injected by the script, so change it here, not with a source patch. Changes an installed scene and re-executes its stored script during preview, inspection, and rendering.

Dissolve a group: children become top-level with the group's transform baked in. Removes the selected group container from the saved project while retaining its children.

Get a URL for direct media upload (PUT the file there, then confirm_media_upload). Starts an upload: returns a time-limited URL the file is PUT to; nothing is stored until confirm_media_upload.

Create a layer (omit layerId; layer.type and props required) or patch one (pass layerId and only what changes; layer.type must match): props, transform, style, timing, sceneKey, animation presets and keyframes, sizes and positions in % of project width. Returns the layer id. It cannot set html/css/scripts: write those with write_layer_source. Creates a layer or overwrites supplied fields on an existing layer in the public-preview project.

Create or edit a SCENE, the named slice of the timeline that holds one shot's layers, idempotent by key so a retry edits instead of duplicating; a new scene lands after the last one (5s by default), and moving it moves its children. With `generation` it also prepares the scene's generated footage or still as a draft (prompt, named references, @scene mentions) without generating anything: free, editable in the Manual editor, and editing it again updates the same step. Creates or edits a scene container, may overwrite existing scene fields, timing and generation draft inputs and may reparent layers in the saved public-preview project; it never generates media or consumes credits.

Write a layer's source after upsert_layer created the html layer: `html` (markup plus one <style data-dm-scene> block) and `scripts` (library { src } entries, then one { code }); all JavaScript goes in scripts, since a <script> tag in html never runs. Returns the frames to inspect next. Write once per scene, then refine with edit_layer_source. Overwrites stored source; scripts run during preview, inspection, and rendering and may access external services.