broll-mcp

broll

The content studio MCP for coding agents. broll gives Claude Code, Codex, and any MCP client real hands for content work: generate media with your own API keys, render videos and carousels deterministically with code, and publish through a draft-first outbox.

The model plans. Code renders. Nothing posts without confirmation.

Why

Every developer running a coding agent hits the same wall: the agent can write the marketing plan, but it can't make the carousel, cut the video, or post it. Existing tools are credit-metered schedulers built for social media managers. broll is built for developers:

• BYO keys, no markup. Image/video generation uses your OPENAI_API_KEY / GEMINI_API_KEY directly. broll never proxies your inference or resells credits. A built-in mock provider keeps every workflow runnable before you add any keys.
• Deterministic rendering. Videos and slides are compiled from declarative plans into exact ffmpeg/sharp invocations. Same plan + same inputs = same output. When AI output drifts, the fix is code — so layout, fonts, captions, and branding live in code.
• Draft-first publishing. Posts are reviewable JSON files in an outbox. publish_post requires confirm: true, validates per-platform rules (char limits, media counts, file sizes) before anything leaves the machine, and reports per-platform results. The export platform always works: it writes a ready-to-post bundle.

Install

Requires Node 20+ and ffmpeg (brew install ffmpeg).

cd broll
npm install && npm run build

Register with Claude Code (or use the checked-in .mcp.json when working inside this repo):

claude mcp add broll -- node /path/to/broll/dist/index.js

Optional environment:

Variable	Purpose
OPENAI_API_KEY	gpt-image-1 image generation
GEMINI_API_KEY	Imagen images + Veo video generation
BLUESKY_IDENTIFIER / BLUESKY_APP_PASSWORD	live Bluesky posting (use an app password)
MASTODON_ACCESS_TOKEN (+ optional MASTODON_INSTANCE)	live Mastodon posting — no app review, any instance
X_API_KEY / X_API_SECRET / X_ACCESS_TOKEN / X_ACCESS_TOKEN_SECRET	live X posting (free API tier works)
BROLL_HOME	workspace location (default ~/.broll)
BROLL_FFMPEG / BROLL_FFPROBE	explicit binary paths

Brand kit: drop a broll.config.json next to where the server runs (see this repo's for an example) — name, handle, colors, font, logo. Every render picks it up automatically.

Tools

Tool	What it does
broll_status	Workspace, ffmpeg, provider + platform readiness. Call first.
generate_image / generate_video	BYO-key generation → workspace assets (mock fallback when keyless)
import_asset / list_assets / probe_asset	Bring in and inspect media
render_video	Declarative RenderPlan → mp4: clips (video/image/color), trims, cover/contain fits, burned-in titles + timed captions, music bed, 9:16 / 1:1 / 4:5 / 16:9
render_carousel	Branded slide sets (the Instagram/LinkedIn format): kicker, headline, body, accent bar, page numbers, watermark — layout is 100% code
extract_frame	Pull a PNG frame so the agent can visually QA its own render
create_post_draft	Text + media + platforms → validated, reviewable draft in the outbox
list_drafts / publish_post	Inspect the outbox; publish with explicit confirm: true

Try it

npm run smoke

drives the real server through a real MCP client: generates a background, renders a 3-slide carousel and a 9:16 teaser video with captions, extracts a QA frame, then drafts and "publishes" an export bundle — all into ./.broll/.

Safety model

• Nothing is published without a draft file on disk first.
• publish_post hard-requires confirm: true — agents are instructed to obtain the user's explicit go-ahead.
• Constraint violations block publishing; they never auto-truncate your text.
• Keys are read from your environment and sent only to their own vendor's API.

Status & roadmap

Early but real: 96 tests including real-ffmpeg integration renders and a full MCP round trip.

• Bluesky video upload
• X chunked video upload
• LinkedIn adapter (needs app review)
• Mastodon adapter
• YouTube Shorts via user OAuth
• Ken Burns / crossfade transitions
• Word-level caption timing from transcripts
• npx broll-mcp distribution

Development

npm test          # unit + integration (real ffmpeg)
npm run typecheck
npm run smoke     # end-to-end artifact check

MIT.