Assets & presets

Two kinds of tool here. The capabilities produce new material — a music bed, a sting, a shot. The listings tell you what the account already has, which is how you turn “use my newsroom brand” into an id the other tools accept.

Capabilities

These return an asset. They do not place it — putting it in the video is an edit_video operation, which keeps “make something” and “change the cut” as separate, individually reversible steps.

generate_music

Generate a background music bed from a description of the vibe (e.g. "hype, upbeat electronic"). Returns an audio file to place with edit_video — use it to change a finished video's music. Reuses a cached bed when one matches, so repeats are cheap.

Parameter	Type	Description
prompt required	string	The feel of the track in a few words — genre, energy, instrumentation. No lyrics.
duration_seconds	number	Roughly how long it needs to play. Defaults to 30.
job_id	string	The video job this is for, when known.

generate_sound_effect

Generate a short sound effect from a description (e.g. "whoosh on a hard cut", "UI click"). Returns an audio file to place with edit_video.

Parameter	Type	Description
prompt required	string	What the sound should be.
duration_seconds	number	How long it should run.
sfx_type	string	Rough category, e.g. "transition", "impact", "whoosh".
job_id	string

find_broll

Find one stock clip or still for a description, from the same libraries the pipeline uses. Use it when the user wants different b-roll and hasn't uploaded their own footage. Returns a file to place with edit_video.

Parameter	Type	Description
prompt required	string	What the shot should show.
source_type	string	Moving footage or a still. Defaults to video. One of: video, image.
aspect_ratio	string	The video's aspect ratio, so the search asks for the right orientation. One of: 9:16, 16:9, 1:1.

Listings

list_presets

List the user's saved presets/templates of a given type (name + id + which is the default). Use before applying a brand kit or caption preset by name.

Parameter	Type	Description
type required	string	One of: brand_kits, captions, voiceovers, video_templates, script_templates, speaker_styles.

Names work, but ids are safer

Tools that take a brand kit or a caption preset accept either the name or the UUID. Names are friendlier in conversation and are what a user will say. If the name doesn’t match anything, the error comes back carrying the list of presets that do exist, so a second attempt can be right — this is the single most common recoverable error over MCP.

list_voices

List available AI narration voices (ElevenLabs catalogue).

Takes no parameters.

The ElevenLabs catalogue available to the account. Pass a voice_id from here to create_video_from_script to choose the narrator for an AI-voiceover video.

Voice rotation is set in the app, not here

A newsroom or a series can nominate an ordered list of voices so consecutive videos don’t all sound like the same person. That rotation is configured in the web app and applies to scheduled runs; picking a voice_id here overrides it for the one video.