Siren
Deterministic visual marketing engine. Your agent plans, renders, and posts on-brand campaigns.
Install
Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).
claude mcp add --transport http siren 'https://mcp.mysiren.ai/mcp'{
"mcpServers": {
"siren": {
"type": "http",
"url": "https://mcp.mysiren.ai/mcp"
}
}
}Documentation
From the project's README on GitHub, refreshed weekly. Links open on GitHub.
Siren MCP
Your agent makes the images, captions, and videos for your brand, then posts them to your socials. You show Siren the brand once. After that you type post this in Cursor, Claude, ChatGPT, Codex, or Grok and it goes out.
Remote MCP server, Streamable HTTP, OAuth 2.1. No API keys to copy.
| Server | https://mcp.mysiren.ai/mcp |
| Registry | ai.mysiren/siren |
| Docs | https://mysiren.ai/docs/mcp |
| Plans | One video is $9.99 once; plans start at $19 a month. MCP and videos are on every plan; credits are the only meter. |
Connect
Claude Code
claude mcp add --transport http siren https://mcp.mysiren.ai/mcpClaude (claude.ai): Settings → Connectors → Custom → https://mcp.mysiren.ai/mcp
Cursor: Settings → Tools & MCP → add a remote server, or in ~/.cursor/mcp.json:
{ "mcpServers": { "siren": { "url": "https://mcp.mysiren.ai/mcp" } } }ChatGPT: Developer Mode on → Settings → Apps & Connectors → Create → https://mcp.mysiren.ai/mcp
Grok: grok.com/connectors → Custom, or grok mcp add --transport http siren https://mcp.mysiren.ai/mcp
The agent opens a consent page on app.mysiren.ai. Approve once. Posting stays off until you turn on Allow posting on that screen. Revoke any time under Developers.
Tools
| Tool | What it does |
|---|---|
get_account | Workspace, plan, credits, connected channels |
clarify_brief | Turns a one-line ask into a brief Siren can render |
create_campaign | Generates the asset. Optional scheduled_at, timezone, platforms |
render_asset | Renders a specific output type |
list_runs, get_run | Status and result URLs |
post_run | Publishes a finished run to your connected channels now |
schedule_post | Queues a finished run for a time in your timezone |
get_brand_dna, update_brand_dna | Read and patch the brand profile |
list_product_screens, upload_product_screen, update_product_screen, delete_product_screen | Product screenshots Siren can paint into assets |
studio_templates | The 33 Studio data-card types, families, and body fields |
studio_card | Render a Studio card. Optional live post |
studio_automate | Create a Studio profile; returns generate curl and hook URLs |
studio_schedule | Render a Studio card and queue a scheduled post |
Posts go through the channels already connected in the Siren dashboard: X, LinkedIn, TikTok and YouTube (Instagram once Meta approves the app). The agent never sees your platform tokens.
Example
> Post an update about the new export feature. Use the dashboard screenshot.The agent calls clarify_brief, then create_campaign, waits on get_run, and calls post_run. One image or film, a caption, and the post, on brand every time.
This repo
Listing and connect docs. The server is hosted at mcp.mysiren.ai. Questions: open an issue or write to hello@mysiren.ai.
Siren · a thousand voices, one signature.
Frequently asked questions
What is Siren?
Deterministic visual marketing engine. Your agent plans, renders, and posts on-brand campaigns.
How do I install Siren?
It runs as a remote server. In Claude Code: claude mcp add --transport http siren 'https://mcp.mysiren.ai/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.
Does Siren need an API key?
Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.
Is Siren open source?
Yes. Its code is on GitHub under the MIT license.
Who maintains Siren?
It is published by Hexahedral-Inc. AI.tn lists it but does not maintain or endorse it.
From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.