# How to connect MailerSend to Hermes Agent (paste one key, 23 tools) > Connect MailerSend to Hermes with ClawLink: paste your MailerSend key once and 23 tools work from chat. No MCP server to run, nothing stored on your machine. Web version: https://claw-link.dev/hermes/mailersend Most guides for giving Hermes Agent MailerSend access start with registering your own OAuth app or pasting API keys into env files, then leave the token refresh and tool wiring to you. ClawLink gives Hermes a more practical MailerSend setup: pair once in the browser and your always-on Hermes agent can act on MailerSend for you, reading and doing real work on your behalf with no auth, token refresh, or tool wiring to build yourself. ## Setup It takes three steps to connect Hermes to MailerSend. 1. **Install ClawLink** — add the plugin to Hermes Agent once. 2. **Connect MailerSend** — one-click OAuth in the ClawLink dashboard. 3. **Use it from chat** — ask Hermes Agent in plain English. **Paste this into Hermes to set up ClawLink:** > Set up ClawLink for Hermes and tell me when it's ready. > 1. Install the plugin: `hermes plugins install ClawLink-HQ/hermes-plugin --enable` > 2. Start pairing with `hermes clawlink begin`. It prints an approval link, so show me the link and stop, don't wait. > 3. I'll approve it in my browser, then reply "approved". > 4. When I say approved, finish setup: `hermes clawlink finish` > 5. Then run `hermes clawlink test` and tell me whether ClawLink is ready. **Alternative for any agent (no plugin needed):** if the Hermes Agent plugin route isn't available or doesn't work, any AI agent with shell access can use the ClawLink CLI instead: ```bash npx -y @useclawlink/cli login # sign in via browser — no API key to paste npx -y @useclawlink/cli connect mailersend # connect MailerSend (browser OAuth) npx -y @useclawlink/cli actions mailersend # list available actions npx -y @useclawlink/cli run mailersend --input '' # execute (add --confirm for writes) ``` ### Install by command The prompt above walks Hermes through this. By hand, it is four commands and a browser approval: ```bash hermes plugins install ClawLink-HQ/hermes-plugin --enable hermes clawlink begin # prints an approval link — open it and approve hermes clawlink finish # after approving in the browser hermes clawlink test ``` Then connect MailerSend in the [ClawLink dashboard](https://claw-link.dev/dashboard) — paste your MailerSend API key once. Verify the connection by asking Hermes: > Pull the relevant data from MailerSend, summarize it in plain English, and point out anything that needs attention. ### Using a different agent? The Hermes plugin is one client of ClawLink's MCP server. Claude Code, Cursor, Codex, or any agent that can run a shell command pairs with the same ClawLink account through the CLI: ```bash npx -y @useclawlink/cli login ``` `login` opens the same browser approval and stores a credential locally. Once MailerSend is connected in the dashboard, that agent calls the same 23 MailerSend tools over MCP. Full setup for MCP clients and shell agents: [connect apps to any AI agent](https://claw-link.dev/learn/connect-apps-to-any-ai-agent). ## MailerSend MCP for Hermes Looking for a MailerSend MCP server for Hermes Agent? ClawLink connects MailerSend to Hermes Agent and exposes 23 MailerSend tools your agent can call over [MCP](https://claw-link.dev/learn/what-is-an-mcp-server), with [hosted auth](https://claw-link.dev/learn/oauth-for-ai-agents) and nothing to run or maintain yourself. Using OpenClaw instead? The [OpenClaw MailerSend integration](https://claw-link.dev/openclaw/mailersend) works the same way. ## What the Hermes Agent MailerSend integration can do 23 MailerSend tools are ready for Hermes Agent once the account is connected. The 22 below are the ones people reach for most; your agent can call all 23. ### 22 of 23 MailerSend tools for Hermes | Tool | What it does | |---|---| | **Get API quota** `mailersend_get_api_quota` | Retrieve current API usage quota | | **Get domain** `mailersend_get_domain` | Retrieve detailed information about a specific sending domain in MailerSend | | **Get domain recipients** `mailersend_get_domain_recipients` | List recipients for a domain | | **Get domains** `mailersend_get_domains` | Retrieve a paginated list of all sending domains configured in your MailerSend account | | **Get general resources** `mailersend_get_general_resources` | Retrieve general API resources and information | | **Get identities** `mailersend_get_identities` | Retrieves a paginated list of sender identities configured in your MailerSend account | | **Get messages** `mailersend_get_messages` | Retrieve a paginated list of sent messages | | **Get recipients** `mailersend_get_recipients` | Retrieve a list of email recipients | | **Get sms activity** `mailersend_get_sms_activity` | Retrieve SMS activity logs | | **Get sms inbounds** `mailersend_get_sms_inbounds` | Retrieve inbound SMS route configurations | | **Get sms messages** `mailersend_get_sms_messages` | Retrieves a paginated list of SMS messages sent through the MailerSend API | | **Get sms numbers** `mailersend_get_sms_numbers` | Retrieve a paginated list of SMS phone numbers | | **Get sms recipients** `mailersend_get_sms_recipients` | Retrieve a list of SMS recipients | | **Get smtp users** `mailersend_get_smtp_users` | Retrieve a list of SMTP users | | **Get templates** `mailersend_get_templates` | Retrieves a paginated list of email templates from your MailerSend account | | **Get tokens** `mailersend_get_tokens` | Retrieves a paginated list of API tokens associated with your MailerSend account | | **Get users** `mailersend_get_users` | Retrieve a list of users associated with your account | | **Get webhooks** `mailersend_get_webhooks` | Retrieve a list of webhooks | | **Create domain** `mailersend_create_domain` | Add a new sending domain to MailerSend | | **Create smtp user** `mailersend_create_smtp_user` | Create a new SMTP user | | **Create token** `mailersend_create_token` | Creates a new API token with specified scopes (permissions) for a domain | | **Create webhook** `mailersend_create_webhook` | Create a new webhook for a MailerSend domain | ## Example prompts **Get Api Quota** > Pull the relevant data from MailerSend, summarize it in plain English, and point out anything that needs attention. **Get Domain** > Pull the relevant data from MailerSend, summarize it in plain English, and point out anything that needs attention. **Get Domain Recipients** > Pull the relevant data from MailerSend, summarize it in plain English, and point out anything that needs attention. **Get Domains** > Pull the relevant data from MailerSend, summarize it in plain English, and point out anything that needs attention. ## ClawLink vs. building it yourself The alternative to ClawLink is usually manual API key setup plus your own token handling, permission troubleshooting, and tool plumbing for Hermes Agent. That is fine if you want to build and maintain the integration yourself. Most teams just want MailerSend working from chat. | | Manual | ClawLink | |---|---|---| | **Credential handling** | Collect, validate, store, and rotate the MailerSend API key yourself, then make sure every tool call uses the right account. | Users complete the hosted ClawLink setup once and the connected MailerSend account becomes available to the agent without you building credential management. | | **Ongoing maintenance** | You own refresh logic, permission debugging, environment config, and every provider-specific edge case for MailerSend. | ClawLink handles the repetitive integration plumbing so your team can focus on the workflow instead of the infrastructure. | | **Agent usability** | You still need to expose the right MailerSend actions to the runtime in a format your agent can reliably use. | 23 tools for MailerSend are already exposed through ClawLink, so the agent can read and act from chat immediately. | ## ClawLink vs. Composio Composio also exposes MailerSend to AI agents. It is developer infrastructure: Python and TypeScript SDKs, an MCP server, and a catalog past 1,000 apps, aimed at teams shipping agent products. ClawLink is built for Hermes Agent users instead. You install the plugin once, connect MailerSend in the browser, and the 23 tools above work from chat. There is no SDK and no config file, and the MailerSend key you paste at setup is stored server-side rather than kept in your environment. Choosing between them? Read the full [Composio alternatives](https://claw-link.dev/hub/composio-alternatives) comparison. ### Hermes paired but still can't use MailerSend Pairing is a two-step handshake: run `hermes clawlink begin`, approve the link in your browser, then run `hermes clawlink finish`. If you ran finish before approving, or the approval link expired, run `hermes clawlink begin` again to get a fresh link. Confirm the plugin was installed with `--enable`, then verify with `hermes clawlink test`. ### Connection succeeds but no tools appear Reconnect MailerSend from the dashboard, then start a fresh chat if the runtime still has the old tool catalog loaded. ### "Tool schema not loaded yet" error when calling MailerSend tools MailerSend tool schemas load on demand the first time a tool runs and are cached after that, so this error usually clears on its own: wait a few seconds and retry the same request. If every MailerSend call keeps failing with it in a fresh chat, reconnect from the dashboard, and contact support if it still persists — that pattern points to a configuration problem on our side, not something you can fix by reconnecting again. ### MailerSend returns 403 or "permission denied" on one action while others work Two usual causes. The connected account may not have access to the specific workspace, inbox, store, or project in the request — check that first. If access looks right, the agent may have sent a placeholder value (like "YOUR_ID" or an example id from documentation) instead of a real one: ask it to run a list or search tool first, then retry the action with a real id from those results. Most failures at this stage are one of these two, not ClawLink bugs. ### API key setup works but results look incomplete Double-check that the API key for MailerSend has the right scopes or account access. A valid key can still be too limited for some reads or writes. ### Is there a Hermes Agent MailerSend integration? Yes. ClawLink is the fastest way to connect Hermes to MailerSend: link your MailerSend account once in the browser and Hermes Agent can call the MailerSend API through 23 ready-made tools — no custom code or token handling. ### How do I connect MailerSend to Hermes with ClawLink? Install the plugin with `hermes plugins install ClawLink-HQ/hermes-plugin --enable`, then pair once: run `hermes clawlink begin`, approve the link in your browser, and run `hermes clawlink finish`. Connect MailerSend in the dashboard and Hermes can use it from the next message — no config files, and the MailerSend key you paste is stored server-side instead of in your environment. ### How long does it take to connect MailerSend to Hermes Agent? About two minutes. Sign in, click Connect next to MailerSend in the dashboard, authenticate, and Hermes Agent can use it from the next chat message. ### Why use ClawLink instead of wiring MailerSend up myself? The alternative to ClawLink is usually manual API key setup plus your own token handling, permission troubleshooting, and tool plumbing for Hermes Agent. That is fine if you want to build and maintain the integration yourself. Most teams just want MailerSend working from chat. ### Hermes paired but still can't use MailerSend Pairing is a two-step handshake: run `hermes clawlink begin`, approve the link in your browser, then run `hermes clawlink finish`. If you ran finish before approving, or the approval link expired, run `hermes clawlink begin` again to get a fresh link. Confirm the plugin was installed with `--enable`, then verify with `hermes clawlink test`. ## Related - [Hermes ActiveCampaign integration](https://claw-link.dev/hermes/activecampaign) — Marketing automation, CRM, and email marketing - [Hermes Benchmark Email integration](https://claw-link.dev/hermes/benchmark-email) — Benchmark Email is a comprehensive email marketing platform offering tools for creating, sending, and analyzing email campaigns. - [Mailchimp tools](https://claw-link.dev/hermes/mailchimp) — Create email campaigns and manage audiences