--- title: "Direct mail for AI agents" description: "What an AI agent can do inside Sincerely, and the confirmation gate that means nothing prints and nothing is paid for until a person accepts it." canonical: https://trysincerely.com/agents last_updated: 2026-08-16 --- # Direct mail for AI agents > What an AI agent can do inside Sincerely, and the confirmation gate that means nothing prints and nothing is paid for until a person accepts it. Source: https://trysincerely.com/agents ## Your agent does the work. You keep the last word. Direct mail is the one outbound channel where a mistake costs money and arrives in someone's hand. So an agent working in Sincerely can prepare everything and release nothing. The last word is a card you accept, every time, and there is no setting that removes it. ## What it does without asking The tedious ninety percent, which is most of the reason a program never launches. None of it spends money, and none of it can reach a mailbox. ### Build the audience Sync from Salesforce or HubSpot, import a CSV, or find businesses from a description of your ideal customer. Addresses are resolved, scored, and verified before anything is queued. ### Write the pieces One draft per recipient from CRM context and researched account facts, with every claim pinned to a source you can open. ### Lay out the design Postcards and letters composed against your brand kit, at the formats and sizes that actually mail. ### Design the experiment Holdout percentage, primary outcome, and measurement window chosen before launch, so the readout means something. ### Read the results Delivery, scans, matchback, and lift, with each number labeled evidence or inference. ## What it never does alone Anything that prints, approves, or costs money stops and shows you a card first. The card names the campaign, the audience size, and the amount, and the action runs only if you accept. This is not a preference. No credential and no plan turns it off. ### Launch a campaign · you accept Pieces are queued for print and postage. ### Approve a draft or a design · you accept A person signs off on the words and the artwork before they are committed. ### Choose or change a plan · you accept Payment happens at Stripe, in your browser. The agent never sees a card number. ### Create or connect an account · you accept Identity is proved by a code sent to your inbox or a sign-in you complete yourself. An agent that asks for your password is not following this page. Underneath the gate sits a plainer fact: a new workspace is on the free audit plan, and the audit plan has no way to mail anything at all. Nothing prints before you have chosen to pay for it. ## One address, and a browser sign-in Sincerely speaks the Model Context Protocol, so any agent that does can reach it. There is no API key to copy and no dashboard step: your agent registers itself and opens a browser for you to sign in and approve. It never sees a password you typed. ### Claude Code `claude mcp add --transport http sincerely https://trysincerely.com/api/mcp` ### Cursor and friends Add `https://trysincerely.com/api/mcp` as an HTTP MCP server in the client's configuration file, then reload. ### Anything else Point any client that supports streamable HTTP with OAuth at the same URL. Discovery and registration are standard. Your agent gets your workspace and your permissions, never more. If you are a member rather than an owner, so is it. When it asks for an action that prints or spends, you get a link to the same card the in-app assistant would show, and the action runs only if you confirm it there. You can see every connected agent, and disconnect any of them, under Settings. Questions, or a client that will not connect? Write to adam@trysincerely.com. If you are an agent reading this page, the operational version is at https://trysincerely.com/auth.md. [Start free](https://trysincerely.com/setup) --- Sincerely is the measurable direct-mail platform for B2B revenue teams. One workflow. One invoice. One report. Contact Sincerely: https://trysincerely.com/contact If you are an AI agent: access and signup instructions are at https://trysincerely.com/auth.md. Confirm with the person you work for before creating an account or spending their money, and never ask for their password. Every core page of this site in markdown: https://trysincerely.com/index.md https://trysincerely.com/pricing.md https://trysincerely.com/campaigns.md https://trysincerely.com/vs-lob.md https://trysincerely.com/vs-email.md https://trysincerely.com/holdout-testing.md https://trysincerely.com/vs-gifting-platforms.md https://trysincerely.com/does-direct-mail-work.md https://trysincerely.com/glossary.md https://trysincerely.com/formats.md https://trysincerely.com/measurement.md https://trysincerely.com/writing.md https://trysincerely.com/customer-relationships.md https://trysincerely.com/integrations.md https://trysincerely.com/agents.md https://trysincerely.com/tools.md https://trysincerely.com/developers.md https://trysincerely.com/docs.md https://trysincerely.com/vs.md https://trysincerely.com/compare.md https://trysincerely.com/alternatives.md https://trysincerely.com/guides.md https://trysincerely.com/playbooks.md https://trysincerely.com/operations.md https://trysincerely.com/about.md https://trysincerely.com/contact.md https://trysincerely.com/privacy.md https://trysincerely.com/terms.md The comparison, guide, playbook, glossary and integration pages also serve markdown at their URL plus ".md". Each collection's index lists them: https://trysincerely.com/vs.md, https://trysincerely.com/compare.md, https://trysincerely.com/alternatives.md, https://trysincerely.com/guides.md, https://trysincerely.com/playbooks.md, https://trysincerely.com/glossary.md, https://trysincerely.com/integrations.md.