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io.github.spruikco/send16-mcp

io.github.spruikco/send16-mcp · v0.5.8

Measured by MCP Station

Description written by the publisher, not verified

Email for AI agents: send mail, manage contacts, automations & webhooks. Zero-DNS first send.

Connect

claude mcp add --transport http send16-mcp https://mcp.send16.com/mcp

{
  "mcpServers": {
    "send16-mcp": {
      "url": "https://mcp.send16.com/mcp"
    }
  }
}

Tools as reported by the server

• whoami
  Verify the API key and return the authenticated workspace: name, plan, email quota (used/limit), and owner. Call this first to confirm the key works before sending. Pair with list_domains to see which `from` addresses are allowed.
• send_email write/delete
  Send a transactional email through Send16. Provide `html`, `text`, or both (text-only is fine for OTPs/receipts/alerts). `from_email` must belong to a domain that is verified in the workspace; call `whoami` for the account and `list_domains` to see which senders are allowed; a send from an unverifie
• send_campaign_test write/delete
  Send a test email for an existing campaign to preview how it will look in recipients' inboxes. Confirm the test address with the user first. Can be refused with 403 SENDING_PAUSED (workspace under review, nothing was sent, tell the user to contact support).
• create_campaign
  Create a new email campaign as a draft: optionally with full HTML content and recipients (exactly ONE of audienceIds / segmentId / contactIds / tagIds / sendToAll) so it's ready to test and send. Nothing is sent until schedule_campaign.
• design_email_template
  Use AI to generate a complete email HTML template based on a description. Returns ready-to-use HTML that can be sent or used in campaigns.
• list_campaigns
  List email campaigns, newest first. Use `search` to find a past campaign the user describes vaguely ('the invite one', 'that July newsletter'); it matches name and subject case-insensitively; try distinctive words from their description and broaden if no hits.
• create_contact
  Add a single new contact, optionally straight into audiences and/or with tags; e.g. 'add this person from my email into the newsletter list'. Contacts are subscribed by default. For more than a handful of people, use import_contacts instead.
• search_contacts
  Search contacts by email address or name. Returns matching contacts with their tags and subscription status.
• list_contacts
  List all contacts with optional filtering by subscription status and tag. Supports pagination.
• import_contacts write/delete
  Bulk import contacts from CSV data (min column: email), optionally straight into audiences and/or with tags. This is the tool for cross-app flows; e.g. pulling people out of Gmail, a CRM, or a spreadsheet and landing them in a Send16 audience in one call. Set updateExisting for upsert semantics (saf
• list_domains
  List all sending domains configured in your Send16 workspace, including their verification status and DNS records.
• check_domain_health
  Check the DNS health of a specific domain, including DKIM, SPF, DMARC, and MX record verification status. Triggers a fresh DNS lookup.
• get_campaign_stats
  Get detailed performance statistics for a specific campaign including open rate, click rate, bounce rate, and delivery metrics.
• get_deliverability_status
  Get your workspace's deliverability summary: sending reputation, domain authentication status, and recent bounce/complaint health. (Deliverability Hub plan feature.)
• list_automations
  List all automations in the workspace, including draft/active/paused status and trigger types.
• get_automation
  Get a single automation by ID, including its trigger, steps, and current status.
• enroll_in_automation write/delete
  Manually enroll a contact in an active automation. The automation must be in 'active' status. Use send_event for event-driven enrollment. Confirm with the user first: the automation can start emailing the contact straight away.
• send_event write/delete
  Fire a custom event for a contact. Automations whose trigger is `{type:'custom_event', eventName:'<name>'}` will enroll the contact and start running. Payload is exposed to condition steps as `event.<key>`. Confirm with the user first if the event could start an automation that emails the contact.
• list_templates
  List starter-gallery email templates available to every workspace.
• save_template
  Save an email design as a reusable template in the user's Send16 workspace. Use this when the user has designed an email (for example in a Claude artifact) and wants it in Send16. Pass the complete email HTML. Send16 hosts every image (remote URLs and inline data: images), converts merge tags like {
• list_workspace_templates
  List the templates saved in the user's own Send16 workspace (their template library, including ones saved with save_template). For the shared starter gallery use list_templates.
• send_template_test write/delete
  Send a preview of a saved workspace template to one email address, so the user can see it in a real inbox. It arrives from noreply@send16.com with a small 'Template test preview' banner and uses sample merge values (first name 'Test'). Only send to the user's own address unless they ask otherwise. C
• get_template
  Get a single starter template by ID, including its EmailContent JSON.
• render_email_content
  Compile an EmailContent JSON object (the shape used by the Send16 builder + templates) into HTML using the platform's authoritative renderer. Returns the exact HTML the API would send. Useful for previews and post-processing.
• add_domain
  Register a new sending domain. Returns the DNS records the user must add to their DNS provider, after which they should call check_domain_health to verify.
• pre_send_review
  Run an AI pre-send review on an email's HTML before sending. Surfaces tone issues, broken links, missing alt text, spam triggers, and accessibility problems.
• generate_email_from_url
  Scrape a URL (e.g. a launch blog post or product page) and generate an email draft from its content. Returns subject, preview text, and HTML body.
• list_messages
  List messages from the unified send log (transactional + campaign). Filter by recipient, sender, status, date range, or source.
• get_message
  Fetch a single message with its full event timeline (created → sent → delivered → opened → clicked → ...).
• get_message_events
  Get just the delivery event timeline for a message: no body or recipient details.
• list_convos
  List inbox conversations. Filter by state, mailbox, label, screener status, or full-text search. Send16's unified inbox combines transactional reply threading with team-managed shared inboxes.
• get_convo
  Get a single conversation with its full thread of posts (incoming + outgoing).
• send_reply write/delete
  Reply to an inbox conversation. The reply is sent from the original recipient address (the alias the convo arrived on) and threaded back to the contact. Show the user the reply text and get a clear yes first: it goes to a real person and cannot be unsent. Can be refused with 403 SENDING_PAUSED (work
• mark_convo_read
  Mark a conversation as read for the current viewer.
• update_convo
  Update conversation status (open/closed/archived/snoozed) or assignee.
• add_convo_note
  Add a private internal note on a conversation. Notes are visible only to workspace members.
• screener_decide
  Decide a pending screener conversation (first-time sender). 'allow' lets future emails through, 'reject' blocks, 'cold' marks as cold outreach.
• list_inbox_counts
  Get unread/total counts per category and label for the inbox sidebar (newsletter, transactional, marketing, calendar, social, cold).
• list_topics
  List subscription topics. Topics are granular categories contacts can subscribe to (e.g. 'product-updates', 'weekly-digest'). Campaigns and automations can be gated to subscribers of a specific topic.
• create_topic
  Create a new subscription topic. Contacts opt into topics individually via the preference center.
• update_topic
  Update a subscription topic (name, description, default).
• delete_topic write/delete
  Delete a subscription topic. All subscribers will be detached.
• list_actions
  List Actions. Actions fire a transactional template when a custom event arrives: simple 'event_name → template' pairings, lighter than full automations.
• get_action
  Get a single Action with its trigger config and template binding.
• create_action
  Create an Action that maps an event name to a transactional template. Each matching event sends one email to the contact.
• update_action
  Update an Action (toggle enabled, change template, change event name).
• delete_action write/delete
  Delete an Action.
• list_audiences
  List audiences (lists). An audience is a static, manually-managed group of contacts.
• create_audience
  Create a new audience.
• add_contacts_to_audience
  Add contacts (by ID) to an audience.
• remove_contact_from_audience write/delete
  Remove a contact from an audience.
• delete_audience write/delete
  Delete an audience (list). Contacts are not deleted; only the list and its memberships are removed.
• list_segments
  List dynamic segments. Segments compute their members from a filter expression at send time.
• preview_segment
  Preview the contacts that match a segment without sending.
• list_events
  List the workspace's events (meetups, workshops, conferences) with registered, attended and no-show counts and each event's public registration page.
• get_event_insights
  Who registered and who came for one event: counts, no-show rate, where people came from (city and state), first-timers vs returning, organisations and registrations over time. Without an eventId, returns insights across every event: regulars and their attendance streaks, cohort retention and the reg
• list_event_registrations
  List the people registered for an event, with status (registered, waitlisted, attended, no_show, cancelled), company, city and check-in time.
• register_for_event
  Register someone for an event. They get the event's confirmation email with their QR ticket unless the organiser switched it off, so confirm the person and the event with the user first. Registering doesn't subscribe them to marketing unless marketingOptIn is true because they asked.
• check_in_attendee
  Check a registrant in at the door (or undo it). Use the registration ID from list_event_registrations.
• update_contact
  Update a contact's profile fields, custom fields, or subscription state.
• delete_contact write/delete
  Delete a contact and all associated events. Irreversible.
• get_contact_timeline
  Get a contact's full activity timeline: emails received, events fired, opens, clicks, automation enrollments, topic changes.
• get_contact_health_score
  Get a contact's 0-100 health score based on recent engagement (opens, clicks, replies).
• send_broadcast write/delete
  One-shot broadcast: create a campaign and immediately schedule it to send, in a single call. Pass either an audienceId, segmentId, topicId, or fully-qualified filter. Provide html OR templateSlug. Before calling, confirm with the user: show them the recipients (or the recipient count), the sender an
• schedule_campaign write/delete
  Schedule (or send immediately) an existing draft campaign to an audience/segment/topic. Before calling, confirm with the user: show them the recipients (or the recipient count), the sender and the subject, and wait for a clear yes. Send16 can refuse a send. 429 SEND_RAMP_LIMIT: new and free workspac
• update_campaign
  Update a draft campaign: name, subject, preview text, sender info, HTML content, and/or recipients. Retarget with exactly ONE of audienceIds / segmentId / contactIds / tagIds / sendToAll, then verify with preview_campaign_recipients before sending. Only drafts can be edited.
• pause_campaign write/delete
  Pause a sending campaign. Already-sent messages are unaffected; remaining sends halt.
• resume_campaign write/delete
  Resume a paused campaign. Confirm with the user first: the remaining recipients start receiving the campaign straight away. The sending limits and pauses described on schedule_campaign still apply.
• duplicate_campaign
  Duplicate a campaign (template, content, and settings) as a new draft; works on sent campaigns too, so this is the way to re-use a past campaign's design. Optionally rename and retarget in the same call (exactly ONE of audienceIds / segmentId / contactIds / tagIds / sendToAll). NOTE: without retarge
• delete_campaign write/delete
  Delete a draft campaign. Sent campaigns cannot be deleted (only archived).
• preview_campaign_recipients
  Preview the recipient set for a campaign before sending. Returns count + sample list.
• activate_automation write/delete
  Activate an automation. New events matching its triggers will start enrolling contacts. Confirm with the user first: once active it can start emailing contacts straight away.
• pause_automation write/delete
  Pause an automation. Existing enrollments freeze in place; no new contacts enroll.
• get_automation_stats
  Get aggregate analytics for an automation: total enrollments, completed, exited, open/click rates per step.
• list_automation_enrollments
  List active and historical enrollments for an automation.
• list_workspaces
  List workspaces the authenticated user has access to (owner or member).
• get_workspace
  Get the current workspace (the one the API key belongs to).
• get_brand
  Get the workspace's brand settings: colors, logo, fonts, and the DESIGN.md spec injected into AI generation prompts.
• update_brand
  Update workspace brand settings. The designSpec field is a Markdown DESIGN.md document fed into AI generation system prompts; use it to encode voice, do/don't lists, and visual rules. companyName/websiteUrl/companyAddress also fill the matching merge tags in templates.
• get_workspace_usage
  Get the current month's send count, contact count, and plan limits.
• list_suppressions
  List suppressed email addresses (bounces, complaints, unsubscribes, manual).
• add_suppression
  Add an email to the suppression list. Future sends to this address will be blocked.
• remove_suppression write/delete
  Remove an email from the suppression list. Use only when you've confirmed the recipient wants to receive mail again.
• list_webhooks
  List configured outgoing webhooks (your endpoints that Send16 POSTs delivery events to). Outgoing webhooks are a plan feature.
• create_webhook
  Register an outgoing webhook endpoint. Send16 POSTs event JSON to this URL with an HMAC-SHA256 signature. Outgoing webhooks are a plan feature.
• delete_webhook write/delete
  Delete an outgoing webhook endpoint.
• regenerate_webhook_secret write/delete
  Rotate the HMAC signing secret for an outgoing webhook endpoint. Returns the new secret once.

Tool changes

• 2026-10-21: whoami, send_email, send_campaign_test, create_campaign, design_email_template, list_campaigns, create_contact, search_contacts, list_contacts, import_contacts, list_domains, check_domain_health
• 2026-10-16: whoami, send_email, send_campaign_test, create_campaign, design_email_template, list_campaigns, create_contact, search_contacts, list_contacts, import_contacts, list_domains, check_domain_health

Repository · Website · JSON · Text for agents · Registry updated 2026-07-12