--- title: "Connect Langfuse and MailerSend - APIANT.ai" description: "When \"New Trace\" fires in Langfuse, your agent runs \"Send an Email\" in MailerSend, or \"Email Is Clicked Through\" in MailerSend to \"Add Comment\" in Langfuse." canonical: "https://apiant.ai/connect/langfuse-to-mailersend" --- # Connect Langfuse and MailerSend When **New Trace** fires in [Langfuse](https://apiant.ai/connections/langfuse), your agent runs **Send an Email** in [MailerSend](https://apiant.ai/connections/mailersend), or **Email Is Clicked Through** in MailerSend to **Add Comment** in Langfuse. Describe the whole flow and it is built, tested on every scenario and kept running. Langfuse **1** trigger Langfuse **14** actions MailerSend **11** triggers MailerSend **1** action What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it. ## What do you want Langfuse and MailerSend to do together? Give your AI client this address. `https://mcp.apiant.ai` One connection does both: ask your client to act in an app once, or have it build an automation that keeps running. Any client that takes a remote MCP server. Nothing to install. Create your free account, then sign in once in your browser. ### Set it up in your client ### Claude Code Run this in the directory you want to work in. `claude mcp add --transport http -s project apiant-ai https://mcp.apiant.ai` Start Claude Code there, approve the server, and sign in in the browser page it opens. [Claude Code guide (opens in a new tab)](https://apiant.ai/docs/mcp/claude-code) ### Claude, web and desktop Open Customize, then Connectors, then Add custom connector, and paste the address. On Team and Enterprise an owner adds it first. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Cursor Add the address to your MCP configuration as a server URL. Cursor signs you in in your browser. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Zed Open Settings, then AI, then MCP Servers, then Add Server, then Add Remote Server. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Codex and the ChatGPT desktop app Open Settings, then MCP servers, then Add server, and choose Streamable HTTP. From the terminal, Codex takes the address with its own add command and then signs you in. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Any other MCP client Paste the address where the client asks for a remote MCP server URL, and name the server apiant-ai where it lets you. APIANT's skills reach the client over the same connection. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) Example flows ## What Langfuse and MailerSend can do together ### From Langfuse to MailerSend - When **New Trace** in Langfuse then **Send an Email** in MailerSend ### From MailerSend to Langfuse - When **Email Is Clicked Through** in MailerSend then **Add Comment** in Langfuse - When **Email Is Delivered** in MailerSend then **Add Dataset Item** in Langfuse Starting points drawn from the triggers and actions in the catalog today. Describe the flow you need, at any depth, and your agent builds it and tests every scenario before it ships. Everything your agent can do with Langfuse and MailerSend ## Triggers and actions 12 triggers · 15 actions - Trigger **New Trace** Polling trigger: fires for newly created traces (dedup by trace id / timestamp). - Action **Add Comment** Add a comment to a trace/observation/session/prompt object. - Action **Add Dataset** Create a new dataset. - Action **Add Dataset Item** Create an item (input/expected_output/metadata) in a dataset. - Action **Add Prompt** Create a new prompt version (text or chat). - Action **Add Score** Create a score attached to a trace/observation/session (numeric, categorical, or boolean). - Action **Delete Trace** Delete a trace by id. - Action **Get Project** Reads the Langfuse project that the connection's project-scoped API key belongs to. - Action **Get Prompt** Get a prompt by name (and optional version/label). - Action **Get Trace** Get a single trace by id, including nested observations/scores. - Action **List Dataset Items** List items in a dataset. - Action **List Datasets** List all datasets in the project. - Action **List Prompts** List all prompts in the project. - Action **List Scores** List scores with optional filters. - Action **List Traces** List traces with optional filters (user, session, tags, timerange). - Trigger **Email Is Clicked Through** Triggers when the recipient clicks on a link. - Trigger **Email Is Delivered** Triggers when an email is delivered. - Trigger **Email Is Hard Bounced** Triggers when an email is hard bounced. - Trigger **Email Is Opened** Triggers when an email is opened. - Trigger **Email Is Reported as Spam** Triggers when an email is reported as spam. - Trigger **Email Is Sent** Triggers when an email is sent. - Trigger **Email Is Soft Bounced** Triggers when an email is soft bounced. - Trigger **Recipient Has Unsubscribed** Triggers when a recipient unsubscribes from your mailing activity. - Trigger **SMS Delivery Failed** Triggers when SMS failed to deliver. - Trigger **SMS Is Delivered** Triggers when SMS is delivered. - Trigger **SMS Is Sent** Triggers when SMS is sent. - Action **Send an Email** Send an email via your MailerSend account. ## Each app on its own - [ **Langfuse** Langfuse is an open-source LLM engineering platform (GitHub) that helps teams collaboratively debug...](https://apiant.ai/connections/langfuse) - [ **MailerSend** MailerSend is a powerful transactional email system built for developers but designed so non-tech teams can...](https://apiant.ai/connections/mailersend) Reviews ## What our customers say ## More from Langfuse - [ **Langfuse to 5DollarFootball** Football fixtures, results, standings and historical odds with corner and card lines](https://apiant.ai/connect/langfuse-to-5dollarfootball) - [ **Langfuse to Cloudflare Trace** Cloudflare Trace is a free JSON wrapper over Cloudflare's edge trace endpoint that reports what Cloudflare...](https://apiant.ai/connect/langfuse-to-cloudflare-trace) - [ **Langfuse to PaperClean** Clean document photos for printing, remove shadows, fix lighting](https://apiant.ai/connect/langfuse-to-paperclean) - [ **Langfuse to Postman** Postman is a platform for building and testing APIs.](https://apiant.ai/connect/langfuse-to-postman) - [ **Langfuse to Rendobar** Hosted media processing over REST: transcode, caption, watermark video](https://apiant.ai/connect/langfuse-to-rendobar) - [ **Langfuse to Runpod** Cloud GPU platform for renting on-demand compute to train and deploy AI models, including serverless...](https://apiant.ai/connect/langfuse-to-runpod) ## More into MailerSend - [ **HubSpot to MailerSend** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/hubspot-to-mailersend) - [ **Google Sheets to MailerSend** Google Sheets is Google's online spreadsheet app for creating, editing and sharing spreadsheets.](https://apiant.ai/connect/google-sheets-to-mailersend) - [ **Gmail to MailerSend** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/gmail-to-mailersend) - [ **Google Calendar to MailerSend** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/google-calendar-to-mailersend) - [ **Google Drive to MailerSend** Google Drive is a cloud storage solution for uploading, sharing, and collaborating on files across devices...](https://apiant.ai/connect/google-drive-to-mailersend) - [ **Mailchimp to MailerSend** Mailchimp marketing automation and email platform.](https://apiant.ai/connect/mailchimp-to-mailersend) Questions ## Langfuse and MailerSend, answered ### ### What can start an automation from Langfuse? Any of Langfuse's 1 trigger in the catalog, including New Trace. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in MailerSend when something happens in Langfuse? Any of MailerSend's 1 action, including Send an Email. Your agent maps the data both ways and tests every scenario before it ships. ### ### Can it also run from MailerSend to Langfuse? Yes. When something happens in MailerSend, your agent can act in Langfuse too. This page covers both directions: MailerSend's triggers and Langfuse's actions are listed here as well. ### ### Do I have to build a connector for Langfuse or MailerSend? No. Both are in the catalog with their triggers and actions. You describe the automation; your agent builds it, tests every scenario and keeps it running. ### ### Can my AI client use Langfuse and MailerSend without building an automation? Yes. With your AI client connected to APIANT, ask it to do something in either app once and it runs that action on the spot. Ask for an automation and your agent builds it, tests every scenario and keeps it running. One connection covers both. ### ### What happens when something fails? Your agent works that out for you. It plans the failure paths along with the happy path, then tests every scenario before it ships. ### ### Is there a free plan? Yes. Every plan includes the agent, including free, and building from your own AI client spends no assistant credits.