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Siren
ai.mysiren/siren in the official MCP registry.
Endpoint https://mcp.mysiren.ai/mcp. Source: github.com/Hexahedral-Inc/siren-mcp.
The registry describes it as: Deterministic visual marketing engine. Your agent plans, renders, and posts on-brand campaigns.
We read its 44 tools on 2026-10-22. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
get_account list_runs get_run create_campaign list_films list_platinum_films list_styles describe_film clarify_brief render_asset upload_media edit_asset post_run schedule_post get_brand_dna update_brand_dna list_product_screens upload_product_screen update_product_screen delete_product_screen upload_logo get_mascot create_mascot mascot_step list_people add_person delete_person list_media get_performance list_posts buy_credits list_brand_videos upload_brand_video delete_brand_video delete_media studio_templates studio_card studio_automate studio_schedule studio_start studio_edit studio_get studio_threads studio_export
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The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/ai-mysiren-siren)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.