# Mailroom > Shipping for teams and AI agents. Slack app for humans; REST API + MCP > server for autonomous agents, with self-serve signup, a production > synthetic sandbox, and human-controlled spending guardrails. > Carriers: UPS, FedEx, USPS. ## For AI agents — start here - Canonical agent guide (authoritative, includes current limits): https://app.mailroom.software/llms.txt - Agent integration guide: https://app.mailroom.software/docs/agents - API docs: https://app.mailroom.software/docs/api - OpenAPI 3.1 spec: https://app.mailroom.software/.well-known/openapi.json - MCP endpoint (stateless streamable HTTP): POST https://app.mailroom.software/mcp (auth: Bearer API key, or OAuth 2.1 with dynamic client registration at /oauth/register) - Self-serve signup: POST https://app.mailroom.software/api/v1/signups (returns a test API key in one call; requires termsAccepted: true and a human contact) - MCP server + 16-tool reference: https://mailroom.software/agents/mcp - Sandbox (synthetic on production): https://mailroom.software/agents/sandbox - Spending caps and human control: https://mailroom.software/agents/guardrails - Pricing, machine-readable: https://mailroom.software/pricing.md - Legal, machine-readable: https://app.mailroom.software/api/v1/legal - Support: email help@support.mailroom.software (no support API endpoint) ## Pages - https://mailroom.software/: product overview (Slack teams) - https://mailroom.software/agents: agent onboarding — quickstart, tool catalog, guardrails, pricing, FAQ - https://mailroom.software/privacy: privacy policy