Resend

Add Contact to Segment

Add a contact to a segment in Resend (by contact ID or email).

RequiredsegmentIdcontextllm_model

Add Suppression

Add an email address to the suppression list in Resend. Suppressed addresses never receive emails from the account, even when included as recipients. Hard bounces and spam complaints are added to the suppression list automatically; use this tool to manually suppress an address when needed, e.g. to honor a do-not-contact request. To suppress many addresses at once, use batch-add-suppressions instead.

Requiredemailcontextllm_model

Batch Add Suppressions

Add multiple email addresses to the suppression list in Resend in a single call. Suppressed addresses never receive emails from the account. Hard bounces and spam complaints are added to the suppression list automatically; use this tool to manually suppress addresses when needed, e.g. to honor do-not-contact requests. For a single address, use add-suppression instead.

Requiredemailscontextllm_model

Batch Remove Suppressions

Remove multiple entries from the suppression list in Resend in a single call, by email addresses or by suppression IDs (provide exactly one of the two). The addresses will start receiving emails again. Before using this tool, you MUST double-check with the user that they want to remove these suppressions. Reference the EMAIL ADDRESSES (or IDs) when double-checking, and warn the user that addresses suppressed due to a bounce or complaint may hurt deliverability if emailed again. You may only use this tool if the user explicitly confirms they want to remove the suppressions after you double-check.

Requiredcontextllm_model

Cancel Broadcast

**Purpose:** Cancel a queued or scheduled broadcast by ID or Resend dashboard URL, without removing it. Cancelling a queued broadcast stops it mid-send (emails already sent are not affected). Cancelling a scheduled broadcast reverts it to draft. **NOT for:** Removing a broadcast entirely (use remove-broadcast). Draft and sent broadcasts cannot be cancelled — sent broadcasts are immutable, and drafts have nothing to cancel. **When to use:** User wants to "stop", "cancel", or "pause" a broadcast that is currently sending or scheduled to send.

RequiredbroadcastIdcontextllm_model

Cancel Email

Cancel a scheduled email that has not yet been sent. Only works for emails that were scheduled using the scheduledAt parameter.

Requiredidcontextllm_model

Compose Broadcast

**Purpose:** Set the TipTap JSON content of a broadcast, enabling it to be edited visually in the Resend dashboard editor. Automatically connects and disconnects from the editor. Can also update metadata (subject, preview text, name) in the same call. **This is the recommended way to set email content.** Content set via compose-broadcast can be visually edited by the user in the dashboard. Use this for newsletters and any broadcast where the user may want to refine the content. **Workflow:** get-tiptap-json-content (with include_schema: true) → compose-broadcast **When to use:** - After create-broadcast, to set the email body - When the user wants to write, edit, or style email content - When the user wants to collaborate on the email in the dashboard editor **Important:** Always call get-tiptap-json-content first to retrieve the existing TipTap JSON, then build your changes on top of it. Skipping this will overwrite all existing content. **Note:** Switching between compose (TipTap) and update (raw HTML) modes is lossy — some content or formatting may be lost. If the broadcast already has HTML content, ask the user before switching to compose mode.

RequiredbroadcastIdcontextllm_model

Compose Template

**Purpose:** Set the TipTap JSON content of a template, enabling it to be edited visually in the Resend dashboard editor. Automatically connects and disconnects from the editor. Can also update metadata (subject, name) in the same call. **This is the recommended way to set email content.** Content set via compose-template can be visually edited by the user in the dashboard. **Workflow:** get-tiptap-json-content (with include_schema: true) → compose-template **When to use:** - After create-template, to set the email body - When the user wants to write, edit, or style email content - When the user wants to collaborate on the email in the dashboard editor **Important:** Always call get-tiptap-json-content first to retrieve the existing TipTap JSON, then build your changes on top of it. Skipping this will overwrite all existing content. **Note:** Switching between compose (TipTap) and update (raw HTML) modes is lossy — some content or formatting may be lost. If the template already has HTML content, ask the user before switching to compose mode.

Requiredidcontextllm_model

Connect to Editor

**Purpose:** Show agent presence in the Resend dashboard editor. Users will see an agent avatar while connected. **When to use:** - To signal to dashboard users that an AI agent is working on the content outside of compose workflows - **Not needed before compose-broadcast or compose-template** — get-tiptap-json-content connects automatically, and compose tools disconnect when done. **Returns:** Connection token and room ID.

Requiredresource_typeresource_idcontextllm_model

Create API Key

Create a new API key in Resend. The token is only shown once upon creation, so you MUST display it to the user.

Requirednamecontextllm_model

Create Automation

**Purpose:** Create an automation workflow that triggers on events and executes a sequence of steps. **When to use:** - User wants to set up automated email sequences (welcome series, drip campaigns, re-engagement) - User wants to automate actions based on events (update contacts, add to segments) **Workflow:** manage-events (create event, if needed) → list-templates (to get template IDs) → get-template (to check if template has "from" and "subject" — if not, use list-domains to pick a verified domain for the step config) → create-automation → send-event (to test) **Returns:** Automation ID and dashboard link. The workflow is a JSON object with one key: "steps" — an array of step objects. Each step has: key (unique string), type, config, and either "next" (string|null) or "branches" (for branching steps). Use keys like: "trigger", "send_email_1", "delay_1", "condition_1", "wait_event_1". ## Step types ### trigger — starts the automation when an event fires (required, exactly one) config: { "eventName": "<event_name>" } Uses "next". ### send_email — send an email using a published template config: { "template": { "id": "<template_id>", "variables": { "<key>": "<value>" } }, "from": "Name <sender@example.com>", "subject": "Email subject", "replyTo": "<address>" } **"from" and "subject" are resolved from the step config first, then fall back to the template.** If neither provides a "from", the email will silently fail to send. If neither provides a "subject", the run will error. Best practice: always set "from" and "subject" on the step config so the automation is self-contained. Use list-domains to find verified domains for "from". "replyTo" and "variables" are optional. Variables can use { "var": "event.<field>" } or { "var": "contact.<field>" } for dynamic values. Uses "next". ### delay — pause the workflow config: { "duration": "<human-readable>" } Examples: "30 minutes", "1 hour", "2 days", "1 week". Max 30 days. Uses "next". ### condition — conditional split based on contact or event data config: A condition rule object: Single rule: { "type": "rule", "field": "event.<field>" or "contact.<field>", "operator": "<op>", "value": <value> } Compound: { "type": "and"|"or", "rules": [<rule>, ...] } Operators: eq, neq, gt, gte, lt, lte, contains, starts_with, ends_with, exists, is_empty. exists/is_empty do not require a value. Uses "branches": { "condition_met": "<step_key>", "condition_not_met": "<step_key_or_null>" } ### wait_for_event — pause until a specific event arrives or timeout config: { "eventName": "<event_name>", "timeout": "<human-readable>", "filterRule": <optional condition rule> } For email lifecycle events use "resend:email.<opened|clicked|bounced|delivered|complained|failed|suppressed>". Uses "branches": { "event_received": "<step_key>", "timeout": "<step_key_or_null>" } ### contact_update — update contact fields config: { "firstName": "<value>", "lastName": "<value>", "unsubscribed": true|false, "properties": { "<key>": "<value>" } } All fields optional. Values can use { "var": "event.<field>" } for dynamic data. Uses "next". ### contact_delete — remove the contact from the audience config: {} Uses "next". ### add_to_segment — add contact to a segment config: { "segmentId": "<segment_id>" } Uses "next". ## Rules 1. Every step must be reachable from the trigger via next/branches. 2. Terminal steps have "next": null (or null branch values). 3. The workflow must be tree-shaped — no merging branches back together. ## Example: Linear drip campaign { "steps": [ { "key": "trigger", "type": "trigger", "config": { "eventName": "user.created" }, "next": "send_email_1" }, { "key": "send_email_1", "type": "send_email", "config": { "template": { "id": "tmpl_123" }, "from": "Welcome <hello@example.com>", "subject": "Welcome!" }, "next": "delay_1" }, { "key": "delay_1", "type": "delay", "config": { "duration": "3 days" }, "next": "send_email_2" }, { "key": "send_email_2", "type": "send_email", "config": { "template": { "id": "tmpl_456" }, "from": "Welcome <hello@example.com>", "subject": "Getting started" }, "next": null } ] } ## Example: Re-engagement with wait_for_event { "steps": [ { "key": "trigger", "type": "trigger", "config": { "eventName": "user.created" }, "next": "send_email_1" }, { "key": "send_email_1", "type": "send_email", "config": { "template": { "id": "tmpl_789" }, "from": "Team <team@example.com>", "subject": "Welcome" }, "next": "wait_event_1" }, { "key": "wait_event_1", "type": "wait_for_event", "config": { "eventName": "resend:email.opened", "timeout": "3 days" }, "branches": { "event_received": null, "timeout": "send_email_2" } }, { "key": "send_email_2", "type": "send_email", "config": { "template": { "id": "tmpl_abc" }, "from": "Team <team@example.com>", "subject": "Did you miss this?" }, "next": null } ] } ## Example: Condition branch { "steps": [ { "key": "trigger", "type": "trigger", "config": { "eventName": "trial.ended" }, "next": "condition_1" }, { "key": "condition_1", "type": "condition", "config": { "type": "rule", "field": "event.converted", "operator": "eq", "value": true }, "branches": { "condition_met": "send_email_1", "condition_not_met": "send_email_2" } }, { "key": "send_email_1", "type": "send_email", "config": { "template": { "id": "tmpl_thanks" }, "from": "Team <team@example.com>", "subject": "Thanks for upgrading!" }, "next": null }, { "key": "send_email_2", "type": "send_email", "config": { "template": { "id": "tmpl_win_back" }, "from": "Team <team@example.com>", "subject": "We'd love to have you back" }, "next": null } ] }

Requirednameworkflowcontextllm_model

Create Broadcast

**Purpose:** Create a broadcast campaign (one email sent to an entire segment). Defines subject, body, and segment; does NOT send yet. Use send-broadcast to send it. **NOT for:** Sending a one-off email to specific people (use send-email). Not for adding contacts (use create-contact). **Returns:** Broadcast ID. Use this ID with send-broadcast to send, or get-broadcast/update-broadcast to manage. **When to use:** - User wants to "email my list", "send a newsletter", "broadcast to my segment", "email all contacts in X" - Newsletter, announcement, or bulk message to one segment - Supports personalization: {{{FIRST_NAME}}}, {{{LAST_NAME}}}, {{{EMAIL}}}, {{{RESEND_UNSUBSCRIBE_URL}}} **"All contacts" note:** Broadcasts require a segment. There is no "all contacts" option in the API. If the user wants to send to all contacts, check list-segments for an existing segment that covers everyone. If none exists, suggest creating one with create-segment. **Workflow:** list-segments (if needed) → create-broadcast → get-tiptap-json-content (with include_schema: true) → compose-broadcast → send-broadcast. **Content options after creating:** - **compose-broadcast** (recommended): Sets TipTap content that the user can visually edit in the Resend dashboard. Use this when the user wants to collaborate on or refine the email in the editor. - **update-broadcast with html/text**: Sets static HTML/text content. Use this only when the user explicitly wants to set raw HTML. Switching between compose and html/text modes is lossy — some content or formatting may be lost. Ask the user before switching.

RequirednamesegmentIdsubjecttextfromcontextllm_model

Create Contact

Create a new contact in Resend. Optionally assign to segments and configure topic subscriptions.

Requiredemailcontextllm_model

Create Contact Import

Bulk-import contacts from a CSV file into Resend. The import is processed asynchronously: this returns an import ID immediately, then use get-contact-import to poll its status and counts. Provide the CSV as raw text via `content`. Max file size 100MB.

Requiredcontentcontextllm_model

Create Contact Property

Create a new contact property in Resend. A contact property is a custom attribute (e.g. "company_name", "plan_tier") that can be attached to contacts.

Requiredkeytypecontextllm_model

Create Domain

Create a new domain in Resend. Returns DNS records that must be configured with your DNS provider for verification. You MUST display the DNS records to the user so they can set them up.

Requirednamecontextllm_model

Create Domain Claim

Start a claim for a domain another Resend account has already verified. The domain is recreated under your account with brand-new DKIM keys, so the previous account's DNS records cannot be reused. Returns a TXT record that MUST be added to your DNS to prove ownership. You MUST display the TXT record to the user. After they add it, use verify-domain-claim, then poll get-domain-claim until status is "completed".

Requirednamecontextllm_model

Create Inbox

**Beta.** Only accounts in the Inboxes beta can use this tool. Create an inbox in Resend. An inbox receives email at an address on one of your domains and groups what arrives into threads. The domain must already be verified for receiving — or set forwarding to true, and Resend returns a forwarding address you point your existing mail provider at instead.

RequiredemailAddresscontextllm_model

Create Inbox Draft

**Beta.** Only accounts in the Inboxes beta can use this tool. **Purpose:** Create a draft in a Resend inbox — a message saved for later, NOT sent. At least one of to, cc, bcc, subject, text, or html is required. Nothing leaves the account until send-inbox-draft is called on it. **NOT for:** Sending mail. To send straight away, use reply-to-inbox-thread-email to answer a thread, forward-inbox-thread-email to pass a message along, or send-email for an unrelated message. **Returns:** The draft's id, type, recipients, subject, the thread and message it replies to if any, and its timestamps. **When to use:** User asks to draft, compose, or prepare a message without sending it, or wants to read the wording back before it goes out. Pass threadId and replyToEmailId together to draft a reply to a message in a thread; omit both to draft a standalone message. The id this returns is the "draftId" that get-inbox-draft, update-inbox-draft, send-inbox-draft, and remove-inbox-draft all take.

RequiredinboxIdcontextllm_model

Create Inbox Label

**Beta.** Only accounts in the Inboxes beta can use this tool. Create a label in a Resend inbox. A label is a tag the threads in that inbox can carry. Creating one does not put it on anything — pass the ID this returns to update-inbox-thread to apply it to a thread. Resend picks a color when you omit one.

RequiredinboxIdnamecontextllm_model

Create Segment

Create a new segment in Resend. A segment is a group of contacts that can be used to target specific broadcasts.

Requirednamecontextllm_model

Create Template

Create a new email template in Resend. Templates are created in draft status. Use publish-template to make them available for sending. Variables use triple-brace syntax in HTML: {{{VAR_NAME}}}. **Workflow:** create-template → get-tiptap-json-content (with include_schema: true) → compose-template → publish-template. **Content options after creating:** - **compose-template** (recommended): Sets TipTap content that the user can visually edit in the Resend dashboard. Use this when the user wants to collaborate on or refine the template in the editor. - **update-template with html/text**: Sets static HTML/text content. Use this only when the user explicitly wants to set raw HTML. Switching between compose and html/text modes is lossy — some content or formatting may be lost. Ask the user before switching.

Requirednamehtmlcontextllm_model

Create Topic

Create a new topic in Resend. Topics allow contacts to manage their subscription preferences for different types of emails.

RequirednamedefaultSubscriptioncontextllm_model

Create Webhook

Create a new webhook in Resend. A webhook allows you to receive notifications at a specified URL when certain events occur (e.g. email.sent, email.delivered, email.bounced).

Requiredendpointeventscontextllm_model

Disconnect from Editor

Remove agent presence from the Resend dashboard editor. Call this when done editing.

Requiredcontextllm_model

Duplicate Automation

Duplicate an existing automation by ID or Resend dashboard URL. Creates a copy with its own ID, including the steps and connections of the original. Use this when the user wants a new automation based on one they already have, instead of rebuilding the workflow from scratch. Use update-automation on the new ID to rename it or change its workflow.

Requiredidcontextllm_model

Duplicate Broadcast

**Purpose:** Duplicate a broadcast by ID or Resend dashboard URL. Creates a new draft broadcast with the same segment, topic, sender, subject, reply-to, preview text, and content as the source, named after the source with " (copy)" appended (truncated to 70 characters). Any broadcast can be duplicated, including sent ones. **NOT for:** Editing the source broadcast (use update-broadcast) or sending the copy (use send-broadcast on the new draft's ID). **When to use:** User wants to "copy", "clone", "duplicate", or "reuse" an existing broadcast as the starting point for a new one.

RequiredbroadcastIdcontextllm_model

Duplicate Template

Duplicate an existing email template in Resend. Creates a new draft copy of the template with a new ID. Accepts a template ID, alias, or Resend dashboard URL.

Requiredidcontextllm_model

Forward Inbox Thread Email

**Beta.** Only accounts in the Inboxes beta can use this tool. **Purpose:** Forward one message from a Resend inbox thread to someone else. This sends a real email the moment you call it, from the inbox's address to the recipients named in "to". **NOT for:** Answering the sender (use reply-to-inbox-thread-email, which goes to the thread's existing participants). Not for composing an unrelated email (use send-email). **Returns:** The forward's email ID — its place in the thread — and its sent email ID, the outgoing email itself, plus who it went to. **When to use:** User asks to forward a message in an inbox thread, pass it along, or loop someone in on it. Before using this tool, you MUST double-check with the user that they want to forward this message. Reference the RECIPIENTS and the SUBJECT when double-checking, and warn the user that forwarding cannot be undone — a sent email cannot be recalled, and everyone in "to" keeps the original message. You may only use this tool if the user explicitly confirms they want to forward the message after you double-check. "to" is the only body field required: html and text are an optional note of your own, because the original message is carried either way. Get the emailId from get-inbox-thread.

RequiredinboxIdthreadIdemailIdtocontextllm_model

Get Automation

**Purpose:** Get details of a specific automation (with its workflow) or list all automations. **Modes:** - With `id`: Returns full automation details including the workflow definition. - Without `id`: Lists all automations with optional status filter and pagination. **When to use:** - User asks "show me my automations" or "what automations do I have?" - User wants to inspect a specific automation's workflow - Before update-automation, to see the current workflow

Requiredcontextllm_model

Get Automation Runs

**Purpose:** List runs for an automation, or get details of a specific run. **Modes:** - With `runId`: Returns detailed run info with step-by-step execution status, outputs, and errors. - Without `runId`: Lists runs for the automation with optional status filter. **When to use:** - User wants to see if an automation is working - User wants to debug a failed automation run - User asks "why did this automation fail?" or "show me recent runs" **Run statuses:** running, completed, failed, cancelled **Step statuses:** pending, running, completed, failed, skipped, waiting

RequiredautomationIdcontextllm_model

Get Broadcast

Retrieve full details of a specific broadcast by ID or Resend dashboard URL (e.g. https://resend.com/broadcasts/<id>), including HTML and plain text content.

RequiredbroadcastIdcontextllm_model

Get Contact

Get a contact by ID or email from Resend.

Requiredcontextllm_model

Get Contact Import

Get the status and counts of a contact import by ID. Use after create-contact-import to track progress (queued, in_progress, completed, failed).

Requiredidcontextllm_model

Get Contact Property

Get a contact property by ID from Resend.

RequiredcontactPropertyIdcontextllm_model

Get Domain

Get a domain by ID from Resend. Returns full domain details including DNS records needed for verification.

Requiredidcontextllm_model

Get Domain Claim

Retrieve the latest claim for a domain by its placeholder Domain ID (the domain_id from create-domain-claim). Returns claim status and the TXT record needed to prove ownership. Poll until status is "completed".

Requiredidcontextllm_model

Get Email

Retrieve full details of a specific sent transactional email by ID, including message_id, HTML and plain text content.

Requiredidcontextllm_model

Email Metrics

Retrieve account-level email delivery and engagement metrics (sent, delivered, bounced, opened, clicked, etc.) for a date range, optionally broken down by period, domain, email, or broadcast.

Requiredcontextllm_model

Get Inbox

**Beta.** Only accounts in the Inboxes beta can use this tool. Get an inbox by ID from Resend, including its forwarding address, how many threads are unread, how many drafts it holds, and when it last received mail. Use list-inboxes to find the ID.

RequiredinboxIdcontextllm_model

Get Inbox Draft

**Beta.** Only accounts in the Inboxes beta can use this tool. Get a draft by ID from a Resend inbox, body included — its recipients, subject, html and text, and the thread and message it replies to if it is a reply. A draft is one message being composed, so its body is returned here, unlike get-inbox-thread, which lists a whole conversation without the bodies. Use this to read a draft back before send-inbox-draft puts it in the mail. Get the draft ID from list-inbox-drafts.

RequiredinboxIddraftIdcontextllm_model

Get Inbox Thread

**Beta.** Only accounts in the Inboxes beta can use this tool. **Purpose:** Get one thread in a Resend inbox: the thread itself plus the metadata of every message in it. **NOT for:** Reading a message's body. This tool returns no html or text — a whole conversation's bodies would flood the response. Use get-inbox-thread-email for one message's body. **Returns:** The thread's id, subject, folder, labels and read state, then for each message its email ID, direction (inbound or outbound), from, to, subject, received_at, read state, and how many attachments it carries. **When to use:** User wants to see a conversation, or you need a message's email ID. A message's ID IS the email ID that get-inbox-thread-email, reply-to-inbox-thread-email, and forward-inbox-thread-email take as their "emailId". Get the thread ID from list-inbox-threads.

RequiredinboxIdthreadIdcontextllm_model

Get Inbox Thread Email

**Beta.** Only accounts in the Inboxes beta can use this tool. **Purpose:** Read one message in a Resend inbox thread, body included — its html and text, its full headers, and the attachments it carries. **NOT for:** Reading a whole conversation at once (use get-inbox-thread, which lists a thread's messages without their bodies). Not for emails sent with send-email (use get-email), and not for mail at the account's Resend receiving address (use get-received-email). **Returns:** The message's email ID, direction (inbound or outbound), from, to, cc, bcc, reply_to, subject, message_id, read state, received_at, one line per attachment (filename, size and attachment ID), and the html and text bodies it has. **When to use:** get-inbox-thread points here for a body. Take the "Email ID" it printed for the message the user wants and pass it as emailId. Attachment contents cannot be downloaded through this server — attachments are listed, not fetched.

RequiredinboxIdthreadIdemailIdcontextllm_model

Get Log

**Purpose:** Get detailed information about a specific API request log, including the full request and response bodies. **Returns:** Log details: id, created_at, endpoint, method, response_status, user_agent, request_body, response_body. **When to use:** - User wants to inspect a specific API request - Debugging a particular API call - User says "show me that log", "what was in that request?"

RequiredlogIdcontextllm_model

Get Received Email

Retrieve full details of a specific received email by ID, including HTML and plain text content, headers, and raw email download URL.

Requiredidcontextllm_model

Get Received Email Attachment

Retrieve details of a specific attachment from a received email, including a time-limited download URL.

RequiredemailIdidcontextllm_model

Get Segment

Get a segment by ID from Resend.

Requiredidcontextllm_model

Get Sent Email Attachment

Retrieve details of a specific attachment from a sent email, including a time-limited download URL.

RequiredemailIdidcontextllm_model

Get Suppression

Get a suppression list entry by ID or email address from Resend. Use this to check whether a specific address is suppressed and why (origin: bounce, complaint, or manual).

RequiredidOrEmailcontextllm_model

Get Template

Get an email template by ID, alias, or Resend dashboard URL (e.g. https://resend.com/templates/<id>) from Resend. Returns full template details including HTML content, variables, and publish status.

Requiredidcontextllm_model

Get TipTap JSON Content

**Purpose:** Retrieve the existing TipTap JSON content of a broadcast or template, optionally bundled with the TipTap schema reference. Also connects the agent to the editor so the avatar is visible while content is being generated. **When to use:** - **Always call this before compose-broadcast or compose-template** to fetch the current document state — even if you expect it to be empty, the resource may have content set via the dashboard - When the user asks to edit, tweak, or modify existing email content - To inspect the current TipTap structure of a resource **Returns:** The TipTap JSON content object for the resource, and optionally the TipTap schema. Use the content as the base for modifications, then pass the updated JSON to compose-broadcast or compose-template. **Note:** This tool automatically connects the agent to the editor. The subsequent compose-broadcast or compose-template call will disconnect when done. **Tip:** Set include_schema to true to get both the existing content and the schema in one call.

Requiredresource_typeresource_idcontextllm_model

Get Topic

Get a topic by ID from Resend.

Requiredidcontextllm_model

Get Webhook

Get a webhook by ID from Resend, including its signing secret. Use this when the user needs the current secret to verify payloads; use rotate-webhook-signing-secret only to replace it.

RequiredwebhookIdcontextllm_model

Get Webhook Event

**Purpose:** Get one event delivered to a webhook, including the exact payload Resend sent to the endpoint. **Returns:** id, type, created_at, status, next_attempt_at (when the next retry is scheduled — null once the event reaches success or failed), and payload (the JSON body sent to the endpoint). **When to use:** User wants to see what Resend actually sent for a specific event, or when the next retry is due. Get the event ID from list-webhook-events first.

RequiredwebhookIdeventIdcontextllm_model

Check for additional tools whenever your task might benefit from specialized capabilities - even if existing tools could work as a fallback.

Requiredcontextllm_model

List API Keys

List all API keys from Resend. Returns API key names, IDs, and creation dates. Don't bother telling the user the IDs or creation dates unless they ask for them.

Requiredcontextllm_model

List Broadcast Clicked Links

**Purpose:** List the links clicked in a broadcast, ranked by total clicks. **Returns:** For each link: id (opaque pagination cursor for that row, not an entity id), url, clicks (total), unique_clicks. Use pagination (limit, after/before) for large lists. **When to use:** - User asks "what links were clicked in this broadcast?", "top clicked links", "click breakdown for this campaign" - Use get-broadcast for overall broadcast details; use this for per-link click data.

RequiredbroadcastIdcontextllm_model

List Broadcast Recipients

**Purpose:** List the individual recipients of a broadcast for a given event type (sent, delivered, opened, clicked, bounced, complained, unsubscribed, suppressed). **NOT for:** Aggregate broadcast performance (use get-broadcast). Not for listing broadcasts themselves (use list-broadcasts). This tool returns per-recipient rows, one per contact per event type. **Returns:** For each recipient: email, id (opaque pagination cursor), contact_id (when known). Also includes count for "opened"/"clicked", bounce_type for "bounced", and clicked_links (url + click count) for "clicked". Use pagination (limit, after/before) for large lists. **When to use:** User asks "who opened this broadcast?", "who bounced?", "who clicked this link?", "who unsubscribed from this campaign?", or wants the list of contacts behind a specific broadcast engagement metric. Use get-broadcast first if you need the broadcast ID from a name.

RequiredbroadcastIdtypecontextllm_model

List Broadcasts

**Purpose:** List all broadcast campaigns (newsletters/bulk emails to audiences) with ID, name, audience, status, timestamps. **NOT for:** Listing transactional emails (use list-emails). Not for listing segments or contacts (use list-segments, list-contacts). **Returns:** For each broadcast: id, name, segment_id, status, created_at, scheduled_at, sent_at. **When to use:** User asks "show my broadcasts", "what newsletters did I send?", "list campaigns". Use get-broadcast for full details of one.

Requiredcontextllm_model

List Contact Imports

List contact imports from Resend. Optionally filter by status. Use to discover import IDs or review past imports.

Requiredcontextllm_model

List Contact Properties

List all contact properties from Resend. This tool is useful for getting property IDs and seeing which custom attributes are configured. If you need a contact property ID, you MUST use this tool to get all available properties and then ask the user to select the one they want. Don't bother telling the user the IDs or creation dates unless they ask for them.

Requiredcontextllm_model

List Contact Segments

List all segments a contact belongs to in Resend (by contact ID or email). Don't bother telling the user the IDs or creation dates unless they ask for them.

Requiredcontextllm_model

List Contact Topics

List all topic subscriptions for a contact in Resend (by contact ID or email). Don't bother telling the user the IDs unless they ask for them.

Requiredcontextllm_model

List Contacts

**Purpose:** List contacts from Resend. Optionally filter by segment. Use to discover contact IDs or emails. **NOT for:** Listing segments (use list-segments). Not for listing sent emails (use list-emails) or broadcasts (use list-broadcasts). **Returns:** For each contact: id, email, first_name, last_name, unsubscribed, created_at. **When to use:** User asks "who's in this list?", "show contacts", "who did I add?" Don't bother telling the user the IDs, unsubscribe statuses, or creation dates unless they ask for them.

Requiredcontextllm_model

List Domains

List all domains from Resend. Returns domain names, statuses, regions, and capabilities. Don't bother telling the user the IDs unless they ask for them.

Requiredcontextllm_model

List Emails

**Purpose:** List recently sent emails (transactional emails sent via send-email) with metadata: recipient, subject, status, timestamps. **NOT for:** Listing broadcast campaigns (use list-broadcasts). Not for composing or sending. **Returns:** Paginated list with to, subject, status, created_at, message_id, and ID per email. **When to use:** - User asks "what emails were sent?", "show recent emails", "did my email go out?" - Checking delivery status of sent messages - Finding an email ID to fetch full content (then use get-email) **Workflow:** list-emails → get-email( id ) when user needs full body or details.

Requiredcontextllm_model

List Inbox Drafts

**Beta.** Only accounts in the Inboxes beta can use this tool. **Purpose:** List the drafts in one Resend inbox — the messages composed there but not sent — each with its ID. **NOT for:** Reading a draft's body (use get-inbox-draft) or sending one (use send-inbox-draft). Not for the messages already in a thread (use get-inbox-thread), and not for sent emails (use list-emails). **Returns:** For each draft: id, type ("standalone" or "reply"), to, cc, bcc, subject, snippet, thread_id, reply_to_email_id, updated_at. **When to use:** User asks what drafts an inbox holds, or you need a draft ID. A "reply" draft answers a message in a thread and carries that thread_id; a "standalone" draft is a new message belonging to no thread. Get the inbox ID from list-inboxes, then the draft ID from here for get-inbox-draft, update-inbox-draft, send-inbox-draft, or remove-inbox-draft. This endpoint is paginated: when more drafts exist, pass the last draft's ID back as "after". When paging backward with "before", pass the first draft's ID back as "before".

RequiredinboxIdcontextllm_model

List Inbox Labels

**Beta.** Only accounts in the Inboxes beta can use this tool. **Purpose:** List the labels in one Resend inbox — the tags its threads can carry — each with its ID. **NOT for:** Putting a label on a thread (use update-inbox-thread) or finding the threads carrying one (use list-inbox-threads and its "label" filter). Both of those take a label ID from here. **Returns:** For each label: id, name, color, created_at. **When to use:** User asks what labels an inbox has, or you need a label ID for a label you have not seen on a thread yet. The thread tools print each label's ID alongside its name, so reuse those when you already have them. Get the inbox ID from list-inboxes.

RequiredinboxIdcontextllm_model

List Inbox Threads

**Beta.** Only accounts in the Inboxes beta can use this tool. **Purpose:** List the threads in one Resend inbox — the conversations that arrived at its address. Filter by folder, sender, or label, or search them as free text. **NOT for:** Reading the messages inside a thread (use get-inbox-thread). Not for emails received at the account's Resend receiving address (use list-received-emails), and not for sent emails (use list-emails). **Returns:** For each thread: id, subject, from, to, labels, message_count, has_attachment, has_draft, read, received_at. **When to use:** User asks what is in an inbox, what is unread, or wants to find a conversation before opening it. Get the inbox ID from list-inboxes, then the thread ID from here to open a thread. This endpoint is paginated: when more threads exist, pass the last thread's ID back as "after". When paging backward with "before", pass the first thread's ID back as "before".

RequiredinboxIdcontextllm_model

List Inboxes

**Beta.** Only accounts in the Inboxes beta can use this tool. **Purpose:** List the Resend inboxes on the account. Use to discover inbox IDs, or to see which addresses receive mail and how much of it is unread. **NOT for:** Reading the mail inside an inbox, or listing emails received at the account's Resend receiving address (use list-received-emails). Not for listing sent emails (use list-emails). **Returns:** For each inbox: id, name, email_address, friendly_name, unread (count of unread threads), last_received. **When to use:** User asks "what inboxes do I have?", or you need an inbox ID for any other inbox tool.

Requiredcontextllm_model

List Logs

**Purpose:** List API request logs for the account. Use to review recent API activity, debug issues, or audit API usage. **Returns:** For each log: id, created_at, endpoint, method, response_status, user_agent. Use pagination (limit, after/before) for large lists. **When to use:** - User wants to see recent API activity - Debugging API issues or checking request history - User says "show my logs", "what API calls were made?", "check recent requests"

Requiredcontextllm_model

List OAuth Grants

List OAuth grants for the team — the apps authorized to act on the team's behalf. Returns every grant, active and revoked; a grant with a non-null revoked_at is no longer active. Each grant includes the client (app) name, scopes, and creation date. Don't bother telling the user the IDs unless they ask for them.

Requiredcontextllm_model

List Received Email Attachments

List all attachments from a specific received (inbox) email. Returns attachment metadata including filename, size, content type, and a time-limited download URL. Use for emails listed by list-received-emails.

RequiredemailIdcontextllm_model

List Received Emails

**Purpose:** List emails received (inbox) by your Resend receiving address. Use for "show my inbox", "what emails did I get?", "list incoming mail". **NOT for:** Listing emails you sent (use list-emails). Not for listing broadcasts (use list-broadcasts). **Returns:** Paginated metadata: from, to, subject, message_id, received time. Use get-received-email with an ID for full content.

Requiredcontextllm_model

List Segments

**Purpose:** List all segments in the account. Use to get segment IDs required by create-contact, create-broadcast, list-contacts. **NOT for:** Listing contacts inside a segment (use list-contacts with segmentId). Not for listing broadcasts (use list-broadcasts). **Returns:** For each segment: name, id, created_at. Use pagination (limit, after/before) for large lists. **When to use:** User says "show my segments", "what lists do I have?", or before create-contact/create-broadcast when segmentId is unknown.

Requiredcontextllm_model

List Sent Email Attachments

List all attachments from a specific sent email (from send-email or list-emails). Returns attachment metadata including filename, size, content type, and a time-limited download URL.

RequiredemailIdcontextllm_model

List Suppressions

**Purpose:** List email addresses on the suppression list. Suppressed addresses never receive emails from the account. Optionally filter by origin: "bounce" (added automatically after a hard bounce), "complaint" (added automatically after a spam complaint), or "manual" (added via the API or dashboard). **NOT for:** Checking a single address (use get-suppression). Not for listing contacts (use list-contacts). **Returns:** For each suppression: email, id, origin, source_id (when present), created_at. Use pagination (limit, after/before) for large lists. **When to use:** User says "show my suppression list", "who is suppressed?", or "why isn't this person receiving emails?" combined with a broad look at suppressed addresses.

Requiredcontextllm_model

List Templates

List all email templates from Resend. Returns template names, statuses, and aliases. Don't bother telling the user the IDs unless they ask for them.

Requiredcontextllm_model

List Topics

List all topics from Resend. This tool is useful for getting topic IDs to use with other tools like send-email.

Requiredcontextllm_model

List Webhook Event Attempts

**Purpose:** List the delivery attempts Resend made for one webhook event, most recent first, with what the endpoint returned each time. **Returns:** For each attempt: id, http_status_code, response (the body the endpoint returned), and sent_at. **When to use:** An event is in the failed or attempting status and the user wants to know why. This is the tool that shows the endpoint's own error response. Get the event ID from list-webhook-events first.

RequiredwebhookIdeventIdcontextllm_model

List Webhook Events

**Purpose:** List the events Resend delivered to one webhook, most recent first, with the delivery status of each. **NOT for:** Listing the event types a webhook subscribes to (use get-webhook). Not for listing emails (use list-emails) or the Events product (use list-events). **Returns:** For each event: id, type (e.g. email.sent), created_at, and status — one of pending, attempting, success, or failed. **When to use:** User asks "did my webhook receive this?", "why is my endpoint missing events?", or wants the delivery history of a webhook. Use get-webhook-event next for the payload, and list-webhook-event-attempts for what their endpoint returned.

RequiredwebhookIdcontextllm_model

List Webhooks

List all webhooks from Resend. Use to get webhook IDs and see which endpoints and events are configured. Not for listing emails, segments, or broadcasts.

Requiredcontextllm_model

Manage Events

**Purpose:** Create, list, get, update, or remove event definitions in Resend. Events define named triggers that your application sends to start automations. Each event can have an optional schema that validates payload data. **Actions:** - `create`: Define a new event with a name and optional schema. - `list`: List all event definitions (paginated). - `get`: Get event details by ID or name. - `update`: Update an event's schema. - `remove`: Delete an event. You MUST confirm with the user before removing. **Workflow:** manage-events (create) → create-automation → send-event **Schema types:** string, number, boolean, date

Requiredactioncontextllm_model

Publish Template

Publish an email template in Resend. Templates must be published before they can be used for sending emails. Re-publishing a previously published template makes the latest changes live. Accepts a template ID, alias, or Resend dashboard URL.

Requiredidcontextllm_model

Remove API Key

Remove an API key by ID from Resend. Before using this tool, you MUST double-check with the user that they want to remove this API key. Reference the NAME of the API key when double-checking, and warn the user that removing an API key is irreversible and any services using it will lose access. You may only use this tool if the user explicitly confirms they want to remove the API key after you double-check.

Requiredidcontextllm_model

Remove Automation

Remove an automation by ID or Resend dashboard URL. Before using this tool, you MUST double-check with the user that they want to remove this automation. Reference the NAME of the automation when confirming, and warn the user that removal is irreversible and will stop all future runs. You may only use this tool if the user explicitly confirms.

Requiredidcontextllm_model

Remove Broadcast

Remove a broadcast by ID or Resend dashboard URL. Before using this tool, you MUST double-check with the user that they want to remove this broadcast. Reference the NAME of the broadcast when double-checking, and warn the user that removing a broadcast is irreversible. You may only use this tool if the user explicitly confirms they want to remove the broadcast after you double-check.

RequiredbroadcastIdcontextllm_model

Remove Contact

Remove a contact from Resend (by ID or email). Before using this tool, you MUST double-check with the user that they want to remove this contact. Reference the contact's name (if present) and email address when double-checking, and warn the user that removing a contact is irreversible. You may only use this tool if the user explicitly confirms they want to remove the contact after you double-check.

Requiredcontextllm_model

Remove Contact from Segment

Remove a contact from a segment in Resend (by contact ID or email). Before using this tool, you MUST double-check with the user that they want to remove the contact from the segment.

RequiredsegmentIdcontextllm_model

Remove Contact Property

Remove a contact property by ID from Resend. Before using this tool, you MUST double-check with the user that they want to remove this contact property. Reference the KEY of the property when double-checking, and warn the user that removing a contact property is irreversible and will remove the property from all contacts. You may only use this tool if the user explicitly confirms they want to remove the contact property after you double-check.

RequiredcontactPropertyIdcontextllm_model

Remove Domain

Remove a domain by ID from Resend. Before using this tool, you MUST double-check with the user that they want to remove this domain. Reference the NAME of the domain when double-checking, and warn the user that removing a domain is irreversible and will stop all email sending/receiving for that domain. You may only use this tool if the user explicitly confirms they want to remove the domain after you double-check.

Requiredidcontextllm_model

Remove Inbox

**Beta.** Only accounts in the Inboxes beta can use this tool. Remove an inbox by ID from Resend. This also deletes all of the inbox's threads. Before using this tool, you MUST double-check with the user that they want to remove this inbox. Reference the EMAIL ADDRESS of the inbox when double-checking, and warn the user that removing an inbox is irreversible and takes every thread in it with it. You may only use this tool if the user explicitly confirms they want to remove the inbox after you double-check.

RequiredinboxIdcontextllm_model

Remove Inbox Draft

**Beta.** Only accounts in the Inboxes beta can use this tool. Remove a draft by ID from a Resend inbox. The draft was never sent, so no mail and no thread is touched — but everything written in it is thrown away. Before using this tool, you MUST double-check with the user that they want to remove this draft. Reference the SUBJECT of the draft when double-checking, and warn the user that removing a draft is irreversible and discards whatever was composed in it. You may only use this tool if the user explicitly confirms they want to remove the draft after you double-check. Get the draft ID from list-inbox-drafts.

RequiredinboxIddraftIdcontextllm_model

Remove Inbox Label

**Beta.** Only accounts in the Inboxes beta can use this tool. Remove a label by ID from a Resend inbox. This takes the label off every thread that carries it, but the threads themselves are left alone and no mail is deleted. Before using this tool, you MUST double-check with the user that they want to remove this label. Reference the NAME of the label when double-checking, and warn the user that removing a label is irreversible and strips it from every thread it is on. You may only use this tool if the user explicitly confirms they want to remove the label after you double-check. Get the label ID from list-inbox-labels.

RequiredinboxIdlabelIdcontextllm_model

Remove Inbox Thread

**Beta.** Only accounts in the Inboxes beta can use this tool. Remove a thread by ID from a Resend inbox. This moves the whole thread, every message in it included, to the trash folder; the messages can be restored with update-inbox-thread while they remain within the trash retention period. Before using this tool, you MUST double-check with the user that they want to remove this thread. Reference the SUBJECT of the thread when double-checking, and tell the user it takes every message in the thread to the trash with it. You may only use this tool if the user explicitly confirms they want to remove the thread after you double-check. To get a thread out of the way without trashing it, use update-inbox-thread with folder "archive" instead.

RequiredinboxIdthreadIdcontextllm_model

Remove Segment

Remove a segment by ID from Resend. Before using this tool, you MUST double-check with the user that they want to remove this segment. Reference the NAME of the segment when double-checking, and warn the user that removing a segment is irreversible. You may only use this tool if the user explicitly confirms they want to remove the segment after you double-check.

Requiredidcontextllm_model

Remove Suppression

Remove an entry by ID or email address from the suppression list in Resend, allowing the address to receive emails again. Before using this tool, you MUST double-check with the user that they want to remove this suppression. Reference the EMAIL ADDRESS when double-checking, and warn the user that the address will start receiving emails again — if it was suppressed due to a bounce or complaint, sending to it may hurt deliverability. You may only use this tool if the user explicitly confirms they want to remove the suppression after you double-check.

RequiredidOrEmailcontextllm_model

Remove Template

Remove an email template by ID, alias, or Resend dashboard URL from Resend. Before using this tool, you MUST double-check with the user that they want to remove this template. Reference the NAME of the template when double-checking, and warn the user that removing a template is irreversible. You may only use this tool if the user explicitly confirms they want to remove the template after you double-check.

Requiredidcontextllm_model

Remove Topic

Remove a topic by ID from Resend. Before using this tool, you MUST double-check with the user that they want to remove this topic. Reference the NAME of the topic when double-checking, and warn the user that removing a topic is irreversible. You may only use this tool if the user explicitly confirms they want to remove the topic after you double-check.

Requiredidcontextllm_model

Remove Webhook

Remove a webhook by ID from Resend. Before using this tool, you MUST double-check with the user that they want to remove this webhook. Reference the ENDPOINT of the webhook when double-checking, and warn the user that removing a webhook is irreversible. You may only use this tool if the user explicitly confirms they want to remove the webhook after you double-check.

RequiredwebhookIdcontextllm_model

Replay Webhook Event

**Purpose:** Queue one more delivery of a webhook event to its endpoint — the same action as the dashboard's Replay button. **NOT for:** Inspecting an event (use get-webhook-event) or its past attempts (use list-webhook-event-attempts). A manual replay does not schedule further automatic retries. **When to use:** User wants to resend a specific webhook event after fixing their endpoint, or re-trigger a delivery that failed or was missed. The webhook must be enabled — a disabled webhook fails this call. Get the event ID from list-webhook-events first.

RequiredwebhookIdeventIdcontextllm_model

Reply to Inbox Thread Email

**Beta.** Only accounts in the Inboxes beta can use this tool. **Purpose:** Reply to one message in a Resend inbox thread. This sends a real email the moment you call it, from the inbox's address to the people already on the thread. At least one of html or text is required. **NOT for:** Writing to someone who is not on the thread (use forward-inbox-thread-email to pass the message along, or send-email for an unrelated message). **Returns:** The reply's email ID — its place in the thread — and its sent email ID, the outgoing email itself. **When to use:** User asks to reply to, answer, or follow up on a message in an inbox thread, and has given you the wording. Before using this tool, you MUST double-check with the user that they want to send this reply. Reference the WORDING you are about to send and the SUBJECT of the thread you are answering when double-checking, and warn the user that a reply cannot be undone — a sent email cannot be recalled. You may only use this tool if the user explicitly confirms they want to send the reply after you double-check. You do not choose the recipients: Resend replies to the thread's existing participants, so the wording is the part the user needs to approve. Omit subject to inherit the thread's. Get the emailId from get-inbox-thread.

RequiredinboxIdthreadIdemailIdcontextllm_model

Revoke OAuth Grant

Revoke an OAuth grant by ID. Before using this tool, you MUST double-check with the user that they want to revoke this grant. Reference the NAME of the app (client) when double-checking, and warn the user that revocation is immediate and irreversible — every access and refresh token issued under the grant stops working, and the app would need to be re-authorized to regain access. You may only use this tool if the user explicitly confirms they want to revoke the grant after you double-check.

Requiredidcontextllm_model

Rotate Webhook Signing Secret

**Purpose:** Replace a webhook's signing secret with a new one — the same action as the dashboard's Rotate button. Returns the new secret. **NOT for:** Changing the endpoint URL or subscribed events (use update-webhook), or reading the current secret (use get-webhook). **When to use:** User believes the signing secret leaked, or wants to rotate it as routine hygiene. For 24 hours, payloads are signed with both the new and the previous secret, so either one verifies them. After that, only the new secret does. The user has that window to update their endpoint's verification code.

RequiredwebhookIdcontextllm_model

Send Batch Emails

**Purpose:** Send up to 100 transactional emails in one API call. Each item has the same fields as send-email (to, subject, text, from, etc.). **NOT for:** Sending one email (use send-email) or the same content to a segment (use create-broadcast + send-broadcast). **When to use:** User wants to send many individual emails in bulk (e.g. 50 password resets, 100 receipts). Not for one-to-many broadcasts.

Requiredemailscontextllm_model

Send Broadcast

**Purpose:** Send (or schedule) an existing broadcast by ID. The broadcast must have been created with create-broadcast first. **NOT for:** Sending a new one-off email (use send-email). Not for creating the broadcast content (use create-broadcast). **Returns:** Send confirmation and broadcast ID. **When to use:** - User has created a broadcast and says "send it", "go ahead and send", "schedule this for tomorrow" - After create-broadcast; call send-broadcast with the returned ID to deliver to the audience - Optional scheduledAt: natural language or ISO 8601 for scheduled send **Workflow:** create-broadcast → send-broadcast. Use list-broadcasts to find existing draft/sent broadcasts.

RequiredbroadcastIdcontextllm_model

Send Email

**Purpose:** Send a single transactional email to one or more recipients immediately (or schedule it). Use for one-off messages, notifications, and direct replies. **NOT for:** Sending the same email to a whole list/audience (use create-broadcast + send-broadcast). Not for managing contacts or audiences. **Returns:** Send confirmation and email ID. **When to use:** - User wants to "send an email" to specific people (names or addresses) - One-off messages: password reset, order confirmation, receipt, alert - User says "email this to X", "notify them", "send a message to..." - Scheduling a single email for later **Workflow:** Get recipient(s) and content from user → send-email. Use list-emails or get-email to check delivery status afterward. **Key trigger phrases:** "Send an email", "Email this to", "Notify", "Send a message", "Reply to them", "Schedule an email"

Requiredtosubjecttextfromcontextllm_model

Send Event

**Purpose:** Fire an event to trigger automations for a specific contact. **When to use:** - User wants to trigger an automation workflow for a contact - Testing an automation by sending a test event **Workflow:** create-event (if needed) → create-automation (if needed) → send-event **Important:** - The event name must match the trigger event name in an automation for it to fire. - Identify the contact by either contactId OR email, not both. - The payload is optional and can contain any key-value data that the automation steps can reference via event.* variables.

Requiredeventcontextllm_model

Send Inbox Draft

**Beta.** Only accounts in the Inboxes beta can use this tool. Send a draft from a Resend inbox. This puts a real email in the mail the moment you call it, from the inbox's address to the recipients the draft already carries, and a sent email CANNOT be recalled or unsent. Before using this tool, you MUST double-check with the user that they want to send this draft. Reference the SUBJECT and the RECIPIENTS of the draft when double-checking, and warn the user that sending cannot be undone. You may only use this tool if the user explicitly confirms they want to send the draft after you double-check. Call get-inbox-draft first if you need to read back exactly what will go out, and update-inbox-draft to change it before sending. Get the draft ID from list-inbox-drafts.

RequiredinboxIddraftIdcontextllm_model

Share Email

Create a shareable link for a sent or received email, so anyone with the link can view it without Resend dashboard access. Works for any email ID, sent or received.

Requiredidcontextllm_model

Update API Key

Rename an existing API key in Resend. Only the name can be changed — permission and domain restrictions are fixed at creation and cannot be updated.

Requiredidnamecontextllm_model

Update Automation

**Purpose:** Update an automation's name, status, or workflow. **When to use:** - User wants to rename an automation - User wants to enable or disable an automation (use status: "disabled" to stop it) - User wants to modify the workflow steps **Important:** - To disable/stop an automation, set status to "disabled". Existing runs will continue to completion. - When updating the workflow, provide the complete new workflow — it replaces the existing one. - Use get-automation first to see the current workflow before making changes. The workflow is a JSON object with one key: "steps" — an array of step objects. Each step has: key (unique string), type, config, and either "next" (string|null) or "branches" (for branching steps). Use keys like: "trigger", "send_email_1", "delay_1", "condition_1", "wait_event_1". ## Step types ### trigger — starts the automation when an event fires (required, exactly one) config: { "eventName": "<event_name>" } Uses "next". ### send_email — send an email using a published template config: { "template": { "id": "<template_id>", "variables": { "<key>": "<value>" } }, "from": "Name <sender@example.com>", "subject": "Email subject", "replyTo": "<address>" } **"from" and "subject" are resolved from the step config first, then fall back to the template.** If neither provides a "from", the email will silently fail to send. If neither provides a "subject", the run will error. Best practice: always set "from" and "subject" on the step config so the automation is self-contained. Use list-domains to find verified domains for "from". "replyTo" and "variables" are optional. Variables can use { "var": "event.<field>" } or { "var": "contact.<field>" } for dynamic values. Uses "next". ### delay — pause the workflow config: { "duration": "<human-readable>" } Examples: "30 minutes", "1 hour", "2 days", "1 week". Max 30 days. Uses "next". ### condition — conditional split based on contact or event data config: A condition rule object: Single rule: { "type": "rule", "field": "event.<field>" or "contact.<field>", "operator": "<op>", "value": <value> } Compound: { "type": "and"|"or", "rules": [<rule>, ...] } Operators: eq, neq, gt, gte, lt, lte, contains, starts_with, ends_with, exists, is_empty. exists/is_empty do not require a value. Uses "branches": { "condition_met": "<step_key>", "condition_not_met": "<step_key_or_null>" } ### wait_for_event — pause until a specific event arrives or timeout config: { "eventName": "<event_name>", "timeout": "<human-readable>", "filterRule": <optional condition rule> } For email lifecycle events use "resend:email.<opened|clicked|bounced|delivered|complained|failed|suppressed>". Uses "branches": { "event_received": "<step_key>", "timeout": "<step_key_or_null>" } ### contact_update — update contact fields config: { "firstName": "<value>", "lastName": "<value>", "unsubscribed": true|false, "properties": { "<key>": "<value>" } } All fields optional. Values can use { "var": "event.<field>" } for dynamic data. Uses "next". ### contact_delete — remove the contact from the audience config: {} Uses "next". ### add_to_segment — add contact to a segment config: { "segmentId": "<segment_id>" } Uses "next". ## Rules 1. Every step must be reachable from the trigger via next/branches. 2. Terminal steps have "next": null (or null branch values). 3. The workflow must be tree-shaped — no merging branches back together. ## Example: Linear drip campaign { "steps": [ { "key": "trigger", "type": "trigger", "config": { "eventName": "user.created" }, "next": "send_email_1" }, { "key": "send_email_1", "type": "send_email", "config": { "template": { "id": "tmpl_123" }, "from": "Welcome <hello@example.com>", "subject": "Welcome!" }, "next": "delay_1" }, { "key": "delay_1", "type": "delay", "config": { "duration": "3 days" }, "next": "send_email_2" }, { "key": "send_email_2", "type": "send_email", "config": { "template": { "id": "tmpl_456" }, "from": "Welcome <hello@example.com>", "subject": "Getting started" }, "next": null } ] } ## Example: Re-engagement with wait_for_event { "steps": [ { "key": "trigger", "type": "trigger", "config": { "eventName": "user.created" }, "next": "send_email_1" }, { "key": "send_email_1", "type": "send_email", "config": { "template": { "id": "tmpl_789" }, "from": "Team <team@example.com>", "subject": "Welcome" }, "next": "wait_event_1" }, { "key": "wait_event_1", "type": "wait_for_event", "config": { "eventName": "resend:email.opened", "timeout": "3 days" }, "branches": { "event_received": null, "timeout": "send_email_2" } }, { "key": "send_email_2", "type": "send_email", "config": { "template": { "id": "tmpl_abc" }, "from": "Team <team@example.com>", "subject": "Did you miss this?" }, "next": null } ] } ## Example: Condition branch { "steps": [ { "key": "trigger", "type": "trigger", "config": { "eventName": "trial.ended" }, "next": "condition_1" }, { "key": "condition_1", "type": "condition", "config": { "type": "rule", "field": "event.converted", "operator": "eq", "value": true }, "branches": { "condition_met": "send_email_1", "condition_not_met": "send_email_2" } }, { "key": "send_email_1", "type": "send_email", "config": { "template": { "id": "tmpl_thanks" }, "from": "Team <team@example.com>", "subject": "Thanks for upgrading!" }, "next": null }, { "key": "send_email_2", "type": "send_email", "config": { "template": { "id": "tmpl_win_back" }, "from": "Team <team@example.com>", "subject": "We'd love to have you back" }, "next": null } ] }

Requiredidcontextllm_model

Update Broadcast

Update broadcast metadata by ID or Resend dashboard URL (name, subject, from, html, text, segment, preview text, reply-to). To edit TipTap content, use compose-broadcast instead. **Important:** The API requires `from` and `segmentId` to be set on the broadcast. If the broadcast was created from the dashboard, these may be empty. Always call get-broadcast first to check, and include `from` and `segmentId` in your update if they are not already set. Use list-domains to find verified domains for the from address, and list-segments to find segment IDs. **Note on html/text fields:** Setting html or text via this tool replaces any content previously set via compose-broadcast. This switch is lossy — some content or formatting may be lost. Prefer compose-broadcast for content changes. If the broadcast was composed with TipTap content, ask the user before overwriting it with raw HTML.

RequiredbroadcastIdcontextllm_model

Update Contact

Update a contact in Resend (by ID or email).

Requiredcontextllm_model

Update Contact Property

Update an existing contact property in Resend. Only the fallback value can be changed — the key and type cannot be modified after creation.

RequiredcontactPropertyIdfallbackValuecontextllm_model

Update Contact Topics

Update topic subscriptions for a contact in Resend (by contact ID or email).

Requiredtopicscontextllm_model

Update Domain

Update an existing domain in Resend. Allows changing tracking settings, TLS mode, and capabilities.

Requiredidcontextllm_model

Update Email

Reschedule a scheduled email by updating its scheduled send time. Only works for emails that were scheduled and have not yet been sent.

RequiredidscheduledAtcontextllm_model

Update Inbox

**Beta.** Only accounts in the Inboxes beta can use this tool. Update an inbox in Resend. Renames the inbox internally, changes the display name shown on the mail it sends, or both — at least one of the two is required. An inbox's email address cannot be changed.

RequiredinboxIdcontextllm_model

Update Inbox Draft

**Beta.** Only accounts in the Inboxes beta can use this tool. **Purpose:** Update a draft in a Resend inbox: change its recipients, its subject, or its body. At least one of to, cc, bcc, subject, text, or html is required. This still sends nothing — the draft only goes out when send-inbox-draft is called. **NOT for:** Changing which thread or message a draft replies to. Those are fixed when the draft is created. Not for editing a message already sent — sent mail cannot be changed. **Returns:** The draft's id, type, recipients, subject, the thread and message it replies to if any, and its timestamps after the update. **When to use:** User asks to change, rewrite, or fix a draft before it is sent. Omitting a field leaves it as it was; passing null for a field clears it, which is the only way to empty one. Get the draft ID from list-inbox-drafts.

RequiredinboxIddraftIdcontextllm_model

Update Inbox Label

**Beta.** Only accounts in the Inboxes beta can use this tool. Update a label in a Resend inbox: rename it, recolor it, or both. The change follows the label everywhere it is already in use, so every thread carrying it shows the new name and color. Get the label ID from list-inbox-labels.

RequiredinboxIdlabelIdcontextllm_model

Update Inbox Thread

**Beta.** Only accounts in the Inboxes beta can use this tool. **Purpose:** Update one thread in a Resend inbox: mark it read or unread, move it to another folder, or apply a label. At least one of read, folder, or labelId is required. **NOT for:** Creating or deleting labels themselves (use create-inbox-label and remove-inbox-label), or deleting the thread (use remove-inbox-thread). **Returns:** The thread's id, subject, folder, labels and read state after the update. **When to use:** User asks to archive a thread, mark it read or unread, move it to spam or trash, or tag it with a label. Moving a thread to trash keeps it — it is the reversible alternative to remove-inbox-thread. Get the thread ID from list-inbox-threads and the label ID from list-inbox-labels.

RequiredinboxIdthreadIdcontextllm_model

Update Segment

Rename an existing segment in Resend.

Requiredidnamecontextllm_model

Update Template

Update template metadata by ID, alias, or Resend dashboard URL (name, subject, from, html, variables, etc.). After updating a published template, use publish-template again to make the changes live. To edit TipTap content, use compose-template instead. **Note on html/text fields:** Setting html or text via this tool replaces any content previously set via compose-template. This switch is lossy — some content or formatting may be lost. Prefer compose-template for content changes. If the template was composed with TipTap content, ask the user before overwriting it with raw HTML.

Requiredidcontextllm_model

Update Topic

Update an existing topic in Resend. Note: defaultSubscription cannot be modified after creation.

Requiredidcontextllm_model

Update Webhook

Update an existing webhook in Resend. You can change the endpoint URL, subscribed events, or enable/disable the webhook.

RequiredwebhookIdcontextllm_model

Verify Domain

Trigger domain verification in Resend. This starts an asynchronous verification process that checks if the DNS records are correctly configured. The domain status will temporarily show as "pending" during verification.

Requiredidcontextllm_model

Verify Domain Claim

Trigger asynchronous DNS verification and ownership transfer for a domain claim, using the placeholder Domain ID. The claim stays "pending" while verification runs; poll get-domain-claim for status. Once "completed", the transferred domain has NEW DKIM records — fetch them with get-domain, add them to DNS, then run verify-domain.

Requiredidcontextllm_model