# Sure

> Calendar building blocks for people, companies, and their agents. Automate what you want to automate; control what you want to control.

Sure provides owner-authorized calendar MCP, customizable calendar frontends and private Git remotes, project-scoped MCP editing and publication, and public booking RPC. These initial contracts were reviewed on 2026-09-28.

Start here: an invited owner signs in at https://app.sure.day/auth/login, creates or selects a page under Calendars → Booking pages, and creates a project token under Advanced → Agent access. Use the token with https://app.sure.day/project-mcp (Authorization: Bearer) and discover tools with tools/list. The Git remote is returned by project_get and shown in Advanced; use username sure and the project token as the HTTPS password. Never put tokens in source files or remote URLs.

External project access does not expose private calendar reads, account connection, agent conversations, memory, workers, or voice. Public bookers need no owner token; changing a booking requires its private management token. Publishing and booking mutations should follow the relevant person's intent.

For private calendar work, the owner opens Calendars → Agent connections → Manage calendar access and creates a separate calendar token. Use it with https://mcp.sure.day/mcp (Authorization: Bearer); discover its sure_* tools with tools/list and read sure_skill with name calendar-review. The grant covers the owner's connected sources, including calendars hidden from the agenda. Applying source edits needs both an editable token and separate source-management permission. Tokens expire after 30 days and can be revoked individually. Project tokens do not authorize calendar MCP; documentation-search MCP authorizes neither product endpoint.

## Public documentation

- [Documentation overview](https://docs.sure.day): Choose an interface and get started.
- [Quickstart](https://sure.day/docs/quickstart.md): Connect an owner-authorized agent, edit one heading, commit, preview, and publish the reviewed revision.
- [Calendar MCP](https://sure.day/docs/calendar.md): Private source reads, calendar-agent tokens, Google and direct iCloud CalDAV management, exact previews, audit outcomes, custom labels, and provider limits.
- [Projects, MCP, and Git](https://sure.day/docs/projects.md): Authentication, tool calls, source revisions, conflicts, Git, previews, publication, rollback, and one-time GitHub export.
- [Frontend and scheduling configuration](https://sure.day/docs/configuration.md): sure.json, source limits, static hosting, runtime JSON, and the opt-in private-day preview channel.
- [Booking RPC](https://sure.day/docs/booking.md): Slots, booking, management capabilities, rescheduling, cancellation, idempotency, states, errors, and rate limits.
- [Project MCP tool schemas](https://sure.day/docs/mcp-tools.json): Generated snapshot of the eight external project tools. Calendar MCP has a separate authenticated tools/list catalog.
- [Complete documentation](https://sure.day/llms-full.txt): All reference text and tool schemas in one fetch.

## Other public information

- [Sure](https://sure.day/): Product home and waitlist.
- [Privacy and data use](https://sure.day/privacy/): Public data-handling policy.