MCP overview

MCP endpoint, authentication and available tools.

Sending exposes an MCP (Model Context Protocol) endpoint at https://sending.dev/api/mcp (streamable HTTP). Agents authenticate with the same bearer API key, or with OAuth 2.1 on behalf of a user, and operate inside server-side guardrails: daily volume and spend caps, an audit log, and per-key scopes.

The server is remote: there is nothing to install. For the commands and configuration files of each client (Claude Code, Claude Desktop, ChatGPT, Cursor, VS Code, Cline, Windsurf) see Install Sending in your agent.

Available tools

Domini e usage

list_domainsverify_domainset_domain_sender_nameget_usageset_frequency_cap

CRM

list_contactsupsert_contactlist_tagscreate_tagupdate_tagdelete_tagtag_contactslist_listscreate_listupdate_listdelete_listadd_contacts_to_listremove_contacts_from_listlist_segmentscreate_segmentestimate_segmentcreate_custom_field

Template

list_templatesget_templatecreate_templateupdate_template

Invio

send_emailsend_messagelist_campaignsget_campaignget_campaign_metricscreate_campaignupdate_campaignestimate_campaignsend_campaign

Allegati e immagini

upload_attachmentlist_attachmentsdelete_attachmentupload_imagelist_images

Automazioni

list_automationsget_automationcreate_automationupdate_automationactivate_automationenroll_contactstest_automationget_automation_logget_automation_stats

Agent Email

list_inboxescreate_inboxlist_threadsget_threadsend_from_inboxreply_threadget_agent_email_metrics

Webhooks e regole

list_webhookscreate_webhookdelete_webhooklist_email_rulescreate_email_ruledelete_email_rule

Attribuzione

get_utm_summarylist_utm_toucheslist_utm_conversionsget_contact_conversionsget_contact_journeyget_conversion_stats

Import

connect_activecampaignstart_activecampaign_importget_import_status

Attachments

The sending tools (send_email, send_message, send_from_inbox, reply_thread, create_campaign) accept attachments: each item declares one source, { id }, { filename, content } (base64) or { filename, url }. For anything but tiny files, call upload_attachment once and reuse the id: inline base64 inflates the agent's context on every call.

{ "name": "send_email", "arguments": {
  "to": "[email protected]", "from": "[email protected]",
  "subject": "Your invoice", "html": "<p>Attached.</p>",
  "attachments": [{ "id": "<ATTACHMENT_ID>" }]
} }

Limits and rules (max 20 attachments, 10 MB each, 25 MB total, executable extensions rejected) are the same as the REST API: see Attachments.

Templates

Install Sending in your agent