MCP server

Send16

io.github.spruikco/send16-mcp

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Website Source

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

87

Token cost

About 17,426 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.send16-mcp]
url = "https://mcp.send16.com/mcp"

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"send16-mcp":{"type":"http","url":"https://mcp.send16.com/mcp"}}}

Antigravity

agy mcp add send16-mcp https://mcp.send16.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"send16-mcp","server_url":"https://mcp.send16.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"send16-mcp","server_url":"https://mcp.send16.com/mcp"}

Tools

• activate_automation ~145 tokens
  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.
• add_contacts_to_audience ~143 tokens
  Add contacts (by ID) to an audience.
• add_convo_note ~144 tokens
  Add a private internal note on a conversation. Notes are visible only to workspace members.
• add_domain ~150 tokens
  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.
• add_suppression ~180 tokens
  Add an email to the suppression list. Future sends to this address will be blocked.
• check_domain_health ~136 tokens
  Check the DNS health of a specific domain, including DKIM, SPF, DMARC, and MX record verification status. Triggers a fresh DNS lookup.
• check_in_attendee ~164 tokens
  Check a registrant in at the door (or undo it). Use the registration ID from list_event_registrations.
• create_action ~275 tokens
  Create an Action that maps an event name to a transactional template. Each matching event sends one email to the contact.
• create_audience ~109 tokens
  Create a new audience.
• create_campaign ~557 tokens
  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.
• create_contact ~365 tokens
  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.
• create_topic ~227 tokens
  Create a new subscription topic. Contacts opt into topics individually via the preference center.
• create_webhook ~298 tokens
  Register an outgoing webhook endpoint. Send16 POSTs event JSON to this URL with an HMAC-SHA256 signature. Outgoing webhooks are a plan feature.
• delete_action Deletes data · ~95 tokens
  Delete an Action.
• delete_audience Deletes data · ~120 tokens
  Delete an audience (list). Contacts are not deleted; only the list and its memberships are removed.
• delete_campaign Deletes data · ~113 tokens
  Delete a draft campaign. Sent campaigns cannot be deleted (only archived).
• delete_contact Deletes data · ~107 tokens
  Delete a contact and all associated events. Irreversible.
• delete_topic Deletes data · ~106 tokens
  Delete a subscription topic. All subscribers will be detached.
• delete_webhook Deletes data · ~101 tokens
  Delete an outgoing webhook endpoint.
• design_email_template ~330 tokens
  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.
• duplicate_campaign ~396 tokens
  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
• enroll_in_automation ~198 tokens
  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.
• generate_email_from_url ~180 tokens
  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.
• get_action ~108 tokens
  Get a single Action with its trigger config and template binding.
• get_automation ~116 tokens
  Get a single automation by ID, including its trigger, steps, and current status.
• get_automation_stats ~126 tokens
  Get aggregate analytics for an automation: total enrollments, completed, exited, open/click rates per step.
• get_brand ~99 tokens
  Get the workspace's brand settings: colors, logo, fonts, and the DESIGN.md spec injected into AI generation prompts.
• get_campaign_stats ~134 tokens
  Get detailed performance statistics for a specific campaign including open rate, click rate, bounce rate, and delivery metrics.
• get_contact_health_score ~119 tokens
  Get a contact's 0-100 health score based on recent engagement (opens, clicks, replies).
• get_contact_timeline ~168 tokens
  Get a contact's full activity timeline: emails received, events fired, opens, clicks, automation enrollments, topic changes.
• get_convo ~109 tokens
  Get a single conversation with its full thread of posts (incoming + outgoing).
• get_deliverability_status ~118 tokens
  Get your workspace's deliverability summary: sending reputation, domain authentication status, and recent bounce/complaint health. (Deliverability Hub plan feature.)
• get_event_insights ~193 tokens
  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
• get_message ~116 tokens
  Fetch a single message with its full event timeline (created → sent → delivered → opened → clicked → ...).
• get_message_events ~111 tokens
  Get just the delivery event timeline for a message: no body or recipient details.
• get_template ~113 tokens
  Get a single starter template by ID, including its EmailContent JSON.
• get_workspace ~84 tokens
  Get the current workspace (the one the API key belongs to).
• get_workspace_usage ~88 tokens
  Get the current month's send count, contact count, and plan limits.
• import_contacts ~430 tokens
  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_actions ~110 tokens
  List Actions. Actions fire a transactional template when a custom event arrives: simple 'event_name → template' pairings, lighter than full automations.
• list_audiences ~92 tokens
  List audiences (lists). An audience is a static, manually-managed group of contacts.
• list_automation_enrollments ~190 tokens
  List active and historical enrollments for an automation.
• list_automations ~95 tokens
  List all automations in the workspace, including draft/active/paused status and trigger types.
• list_campaigns ~274 tokens
  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.
• list_contacts ~202 tokens
  List all contacts with optional filtering by subscription status and tag. Supports pagination.
• list_convos ~248 tokens
  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.
• list_domains ~100 tokens
  List all sending domains configured in your Send16 workspace, including their verification status and DNS records.
• list_event_registrations ~184 tokens
  List the people registered for an event, with status (registered, waitlisted, attended, no_show, cancelled), company, city and check-in time.
• list_events ~138 tokens
  List the workspace's events (meetups, workshops, conferences) with registered, attended and no-show counts and each event's public registration page.
• list_inbox_counts ~106 tokens
  Get unread/total counts per category and label for the inbox sidebar (newsletter, transactional, marketing, calendar, social, cold).
• list_messages ~392 tokens
  List messages from the unified send log (transactional + campaign). Filter by recipient, sender, status, date range, or source.
• list_segments ~94 tokens
  List dynamic segments. Segments compute their members from a filter expression at send time.
• list_suppressions ~147 tokens
  List suppressed email addresses (bounces, complaints, unsubscribes, manual).
• list_templates ~86 tokens
  List starter-gallery email templates available to every workspace.
• list_topics ~124 tokens
  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.
• list_webhooks ~103 tokens
  List configured outgoing webhooks (your endpoints that Send16 POSTs delivery events to). Outgoing webhooks are a plan feature.
• list_workspace_templates ~121 tokens
  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.
• list_workspaces ~88 tokens
  List workspaces the authenticated user has access to (owner or member).
• mark_convo_read ~106 tokens
  Mark a conversation as read for the current viewer.
• pause_automation ~118 tokens
  Pause an automation. Existing enrollments freeze in place; no new contacts enroll.
• pause_campaign ~116 tokens
  Pause a sending campaign. Already-sent messages are unaffected; remaining sends halt.
• pre_send_review Sends messages · ~187 tokens
  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.
• preview_campaign_recipients ~120 tokens
  Preview the recipient set for a campaign before sending. Returns count + sample list.
• preview_segment ~108 tokens
  Preview the contacts that match a segment without sending.
• regenerate_webhook_secret ~121 tokens
  Rotate the HMAC signing secret for an outgoing webhook endpoint. Returns the new secret once.
• register_for_event ~288 tokens
  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.
• remove_contact_from_audience ~125 tokens
  Remove a contact from an audience.
• remove_suppression ~154 tokens
  Remove an email from the suppression list. Use only when you've confirmed the recipient wants to receive mail again.
• render_email_content ~234 tokens
  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.
• resume_campaign ~148 tokens
  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.
• save_template ~578 tokens
  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 {
• schedule_campaign ~466 tokens
  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
• screener_decide ~163 tokens
  Decide a pending screener conversation (first-time sender). 'allow' lets future emails through, 'reject' blocks, 'cold' marks as cold outreach.
• search_contacts ~200 tokens
  Search contacts by email address or name. Returns matching contacts with their tags and subscription status.
• send_broadcast Sends messages · ~761 tokens
  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
• send_campaign_test Sends messages · ~237 tokens
  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).
• send_email Sends messages · ~924 tokens
  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_event Sends messages · ~365 tokens
  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.
• send_reply Sends messages · ~235 tokens
  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
• send_template_test Sends messages · ~299 tokens
  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
• update_action ~173 tokens
  Update an Action (toggle enabled, change template, change event name).
• update_brand ~353 tokens
  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.
• update_campaign ~489 tokens
  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.
• update_contact ~164 tokens
  Update a contact's profile fields, custom fields, or subscription state.
• update_convo ~168 tokens
  Update conversation status (open/closed/archived/snoozed) or assignee.
• update_topic ~130 tokens
  Update a subscription topic (name, description, default).
• whoami ~131 tokens
  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.

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