Tools Reference

This reference documents every tool available through Lettr’s MCP servers. Some tools are available on both the remote and local servers, while others are exclusive to one.

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Tool Availability

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Email Sending

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send_email

Send an email with plain text, HTML, or AMP HTML content. Supports merge tags for variable substitution. Available on: Remote, Local Example prompt: “Send a welcome email to john@example.com from hello@mycompany.com with the subject ‘Welcome to Acme‘“

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send_template_email

Send an email using a pre-defined template specified by its slug. Available on: Remote only Example prompt: “Send the order-confirmation template to customer@example.com with order_id 12345”

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Template Management

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list_templates

Lists all email templates for your team with metadata including name, slug, editor type, version count, and merge tags. Available on: Remote, Local Example prompt: “List all my email templates” or “What templates are in project 3?“

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get_template

Gets detailed information about a specific template, including its HTML content and merge tags. Available on: Remote, Local Example prompt: “Show me the HTML content of the welcome-email template”

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create_template

Creates a new Custom HTML email template. Available on: Remote, Local Example prompt: “Create a new template called ‘Invoice Reminder’ in folder 1 with a basic HTML layout”

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update_template

Updates a template’s content and creates a new active version. Supports both Custom HTML and Topol editor templates. Available on: Remote, Local Example prompt: “Update the welcome-email template with new HTML content”

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delete_template

Permanently deletes a template and all its versions. Available on: Local only Example prompt: “Delete the old-welcome-email template”

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get_merge_tags

Retrieves the merge tag variables that a template expects, so you know which substitution data to provide when sending. Available on: Local only Example prompt: “What merge tags does the order-confirmation template expect?”

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Domain Management

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list_sending_domains / list_domains

Lists all sending domains configured for your team with verification status, DNS configuration status, and whether they can be used for sending. Available on: Remote (list_sending_domains), Local (list-domains) Parameters: None Example prompt: “Show me all my sending domains and their verification status”

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list_tracking_domains

Lists all tracking domains configured for your team. Tracking domains are used to track email opens and clicks with your own branded domain. Available on: Remote only Parameters: None Example prompt: “What tracking domains do I have set up?“

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list_inbound_domains

Lists all inbound domains configured for your team. Inbound domains receive emails via MX records. Available on: Remote only Parameters: None

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list_storage_domains

Lists all email storage domains configured for your team. Storage domains serve email assets (images, files) from your branded domain. Available on: Remote only Parameters: None

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create_domain

Registers a new sending domain. Available on: Local only Example prompt: “Add notifications.example.com as a sending domain”

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get_domain

Gets detailed information about a sending domain, including its DNS records for SPF, DKIM, and DMARC setup. Available on: Local only Example prompt: “Show me the DNS records for my sending domain”

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delete_domain

Removes a sending domain from your account. Available on: Local only Example prompt: “Remove the old.example.com sending domain”

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verify_domain

Triggers DNS verification for a sending domain to check if SPF and DKIM records are properly configured. Available on: Local only Example prompt: “Verify the DNS records for my sending domain”

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Configuration

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list_api_keys

Lists all API keys for your team, showing each key’s name, key ID, prefix, permissions level, and IP whitelist configuration. Available on: Remote only Parameters: None Example prompt: “List my API keys and their permissions”

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list_webhooks

Lists all webhooks configured for your team, including target URL, enabled status, event types, authentication type, and delivery health indicators. Available on: Remote, Local Parameters: None

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get_webhook

Gets detailed information about a specific webhook, including its delivery status and configuration. Available on: Local only Example prompt: “Show me the details for my delivery webhook”

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Analytics

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get_analytics

Returns aggregate email delivery analytics with a daily breakdown, including targeted, accepted, bounced, and opened counts. Available on: Remote only Example prompt: “Show me my email delivery stats for the last 30 days”

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list_template_stats

Lists templates with delivery statistics broken down by campaign, including sent, delivered, opened, and bounced counts. Available on: Remote only Example prompt: “Which of my templates has the best open rate this month?”

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Monitoring

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browse_email_events

Browse email delivery events with optional filtering and pagination. Available on: Remote only Example prompt: “Show me the last 10 bounced emails” or “What emails were sent to john@example.com today?“

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browse_api_logs

Browse API request logs with optional filtering and pagination. Available on: Remote only Example prompt: “Show me failed API requests from the last 24 hours” or “Were there any 500 errors today?”

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Related Topics