Siren MCP server

• add_personFree

  Add a face to the people library. Siren crops it round in a few seconds (status cropping, then ready). Only upload people who agreed.

• buy_creditswrite actionFree

  Get a Stripe checkout link for more credits. Give the link to the human; they pay on Stripe and the credits land in about a minute. Nothing is charged by this call. Read the balance on get_account.

• clarify_briefFree

  Ask Siren's clarifier whether a brief is specific enough to generate from. Returns ready=true/false plus follow-up questions. Use before create_campaign when the user's request is vague.

• create_campaignwrite actionFree

  Create a Siren campaign from a plain-language brief — the full pipeline: plan, on-brand copy, deterministic render, verify. Returns the run; poll get_run until it finishes. Spends credits (image 10, video 25; voice or music-only is the same 25). Pass output_type to pin a film (list_films has the catalog); omit it and Siren picks. Optional scheduled_at (ISO-8601) queues a sequential post (X → Instagram → TikTok, or platforms you pass) when the render succeeds — requires Allow posting. Fails with a 402 upgrade message if the plan or balance can't cover it. FILM KNOBS: voiceover (true narrated / false music only), direction (mood, pace, motion, music in one line), music (a bed id), media (upload_media URLs the film shows). Images ignore the film knobs: Siren writes and paints them from the brief and Brand DNA. ANY BRAND: pass `brand` to make it for a brand that is not this workspace's own, e.g. brand={"name": "Acme", "site": "acme.com", "logo_url": "https://acme.com/logo.png", "primary": "#FF4400"}. Nothing of this workspace's identity leaks in. The exact same request within 24 hours returns the run it already started, as it is now, with replayed=true and no new charge. Change the brief to make another.

• create_mascotwrite actionFree

  Start the brand mascot: from a description (note, kind) or from a reference picture. Paid plans; 100 credits. Siren paints a hero in about a minute; poll get_mascot, show the human, then mascot_step keep (build the pose sheet) or retry (paint again, 3 tries). One mascot per workspace.

• delete_brand_videowrite actionFree

  Remove a clip from Brand DNA, file and poster included.

• delete_mediawrite actionFree

  Delete one photo or video uploaded with upload_media. Only this workspace's uploads; a film that already rendered keeps its copy.

• delete_personwrite actionFree

  Remove a face from the people library.

• delete_product_screenwrite actionFree

  Remove a product screenshot from Brand DNA. Does not delete Brand Memory.

• describe_filmFree

  The full contract for one film: what it is and when to hire it, its body JSON Schema, a reference body, the seed envelope, media slots (which fields take image/video URLs), the brand prefills (colours, logo, screens) and the override rules. Call it before writing a render_asset body.

• get_accountFree

  Get the connected Siren workspace: plan, key scopes, auto-post setting, and daily limit. Call this first to learn what the account can do before generating. Empty asset_types / channels / connected_accounts lists mean UNRESTRICTED, not missing — never stop on them. Film renders need plan pro or above (empire/scale/pro).

• get_brand_dnaFree

  Get this workspace's Brand DNA: brand_name, brand_kind, overview, tagline, offer, features, products, audience, palette, logos, plus `checks`: what to fix before rendering (thin Brand DNA, a typed accent the brand's own work does not use). Call right after get_account; fix thin DNA first with update_brand_dna and upload_product_screen, or ask the human for the site. Not Brand Memory.

• get_mascotFree

  The workspace mascot: status (hero, keeping, frames, ready), the hero picture, tries left, and every pose frame with its URL. Null mascot = none yet.

• get_performanceFree

  How the posts did: totals (impressions, engagement, replies, engagement rate) and the top posts with views, likes and replies.

• get_runwrite actionFree

  Get one run by id — full status, output text, asset URLs, caption, and any error. Poll this after create_campaign or render_asset until status is terminal. Wait `poll_after_seconds` between polls; `progress` and `eta_seconds` say how far along it is. A finished film carries `film_check`, advice only: when `ok` is false, show the human the video and the findings and let them decide. Re-render at most once, and only for a defect you can name in what you sent (a missing image, a wrong name). A finished run carries `caption`: the post caption Siren wrote in the run's brand (or yours, if you passed one); show it with the asset. After post_run, `posts[]` carries each platform's status and, once it fires, the live URL and the caption that went out.

• list_brand_videosFree

  The brand's own clips in Brand DNA: name, what each shows, when to use it, tags, best moments with timestamps, poster and scan_status.

• list_filmsFree

  Every live film master Siren can render: name, what it is, when to hire it, runtime, aspect, whether this plan can render it, and `fits_this_brand` with what is `missing` for this workspace (films that fit come first). Films are deterministic MP4s; video renders need Pro or above. Read this before promising a specific film, then describe_film for its body.

• list_mediaFree

  Photos and videos uploaded with upload_media, newest first, with their URLs. Reuse a URL in create_campaign media or a film body.

• list_peopleFree

  The people library: team faces Siren can put in stills (name, role, team, status cropping or ready, round crop URL).

• list_postsFree

  Every post Siren sent or queued: platform, status, live URL, time, and counts by status (posted, queued, failed).

• list_product_screensFree

  List the brand assets in Brand DNA: product photos, app screenshots, packaging. Each row has name, kind, description, use_when, tags, scan_status (scanning / ready / failed), device, theme, url.

• list_runsFree

  List the workspace's generation runs (newest first): status, brief, channel, asset URLs, and caption. Page with offset to see them all.

• mascot_stepFree

  Move the mascot on: keep the hero, paint it again, or add a pose. Ask the human before keep, since it builds the whole sheet.

• post_runwrite actionFree

  Post a finished run's assets to the workspace's CONNECTED SOCIAL ACCOUNT. This is live, public distribution on the customer's channel — always confirm with the user before calling. Only works if the grant was authorised with posting allowed. Pass `caption` to own the words; it goes out verbatim. The call queues the post behind a short publish window (about two minutes, cancellable) rather than firing inline: poll get_run after that and read `posts[].url` for the live permalink and the caption that went out.

• render_assetFree

  Render films from pre-formed SirenSeed bodies (advanced). FILMS ONLY: images are painted from a brief, so for any image, ad or creative call create_campaign with asset_type=card (a still here returns 422 stills_use_a_brief). Each item: {output_type, channel, seed_body, archetype?, family?, surface?, caption?, voice_id?, music?, direction?, brand_override?}. Prefer create_campaign unless the user has concrete seed JSON. Returns run ids, `estimated_seconds` and `poll_after_seconds`; wait that long, then get_run. THE DIRECTOR: every film body is edited against Brand DNA before it renders. It keeps the film and your brand-specific lines, rewrites empty, generic or reference-body copy, and never touches media. `director` in the response says what changed. `direction` is a free line ("dark, club energy, fast") that steers words, pace and music. A film that cannot use what you sent returns 422 film_does_not_fit with a `fix` and `films_that_fit`. ANY BRAND: put brand_override={"name": "Acme", "site": "acme.com", "logo_url": "https://acme.com/logo.png", "primary": "#FF4400", "accent": "#111111"} on an item to render it for a brand that is not this workspace's own. With a name it is a clean slate: none of this workspace's logo, mascot, font, handle, screenshots or stills are used. Media slots take only URLs you uploaded with upload_media.

• schedule_postwrite actionFree

  Schedule a finished run to post at scheduled_at (ISO-8601). Shows in the customer's local timezone. platforms: x, instagram, tiktok, linkedin, youtube, or everything. Posts fire sequentially. Requires Allow posting. Prefer this over post_run when the user names a time. On create_campaign you can pass scheduled_at instead.

• studio_automatewrite actionFree

  Create a Studio profile on this API key. Returns generate curl and inbound hook URLs (Stripe, GitHub, Uptime Kuma, Product Hunt, generic). Passing delivery.social_account_ids turns on social delivery for the profile — that publishes, so it requires Allow posting.

• studio_cardFree

  Render a Studio data card from a type + body. Deterministic React, no paint. Optional live post after render. Returns run_id, image url, and post url when posted.

• studio_scheduleFree

  Render a Studio card then queue a ScheduledPost at scheduled_at.

• studio_templatesFree

  List Siren Studio's 33 React data-card types with family, description, and body schema. Use this before studio_card so the body matches.

• update_brand_dnawrite actionFree

  Patch Brand DNA. Send only keys to change. Nested bags (offer, product_map, icp) merge. Examples: {tagline, overview, offer: {product_name, one_liner, features, who_its_for, primary_cta}, product_map: {offerings, how_we_work}, icp: {who_buys, pains}}. Does not read or write Brand Memory.

• update_product_screenwrite actionFree

  Edit an existing brand asset: name, description, kind, use_when, and the screenshot tags (screen_type, device, theme).

• upload_brand_videowrite actionFree

  Add a product demo, walkthrough or footage to Brand DNA. With only the file, Gemini reads frames across the clip and writes what it shows, when to use it, tags and the best moments (scan_status scanning, then ready in about 15 seconds; poll list_brand_videos). Films play it when a brief names it ("launch film with our checkout demo"). Videos are for films; stills are painted from pictures.

• upload_logowrite actionFree

  Set the workspace logo in Brand DNA. Every render uses it.

• upload_mediawrite actionFree

  Store a photo or video the human wants in a post, from an https URL or base64. Returns a workspace-owned URL to put in any media slot of a film body (describe_film lists the slots) — the renderer reads it directly. Images: PNG/JPG/WebP up to 15 MB. Videos: MP4/MOV/WebM up to 200 MB. The same bytes are stored once (content-hashed).

• upload_product_screenwrite actionFree

  Upload a brand asset (product photo, app screenshot, packaging) into Brand DNA and store it on R2. Pass image_url (https PNG/JPG/WebP) or image_base64. Two ways to file it: - Send `description` (and optionally kind, use_when, tags, name): Siren trusts your words and files the asset as-is. No read. - Send only the file: Gemini reads the picture and writes name, kind, description, use_when, tags itself. scan_status goes scanning → ready in about 8 seconds; poll list_product_screens. kind is free text ("product photo", "dashboard screenshot", "packaging"), there is no fixed list. A brief that names an asset ("advertise the pink handbag") pulls that file into the still. screen_type / device / theme only matter for device-framed screenshot masters.

• –Code scanremote-only server, no package to scann/a
• Live reliabilityremote reachable in 1090ms20/20
• Tool poisoning36 tool descriptions checked15/15
• Auth qualityopen endpoint exposes 17 write-action tools with no auth3/15
• Maintenancelast push 7 days ago15/15
• Maintainer identitynamespace and repository owner differ4/10

Siren: common questions

Is Siren MCP server safe?

Mostly: it is graded B (76/100). Read the Siren safety report

How do I install Siren?

It runs remotely at mcp.mysiren.ai. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.

Does Siren need an API key?

Not as far as the registry entry and our scan can tell: no credentials are declared or required.

Is Siren maintained?

The last commit was 9 days ago (2026-09-12). The latest release is v1.1.0.

Is Siren up?

100% of our last 7 checks got an answer. We check remote servers about four times a day.

What can I use instead of Siren?

Servers from other publishers that do the same job: Agent-Native Plan MCP server, Dvalincode MCP server and adrkit decision memory MCP server. Compare all Siren alternatives.