# Mesta Dataroom > Mesta is a private virtual data room (VDR) for confidential deal documents such as M&A due diligence. Anyone can create an organization, but every room is invite-only. An account can belong to several organizations, and guests from other organizations see only the rooms they are invited to. Organization admins manage their organization's rooms but open documents only as room members. Room contents are never public. What an agent can learn from this site without an account is limited on purpose: rooms and everything else past sign-in are private and served with `noindex`. Each page below is the developer portal's documentation as Markdown; the portal itself, with every request and response schema, is public. ## Documentation - [Overview](https://vdr.mesta.click/docs/overview.md.txt): Share confidential deal documents with buyers, investors and auditors, and know who read what. Guides, API reference and agent tooling in one place. - [Quickstart](https://vdr.mesta.click/docs/quickstart.md.txt): From sign-up to a shared room, then the same from the API. - [Glossary](https://vdr.mesta.click/docs/glossary.md.txt): The terms used across Mesta and its API. ## Guides - [Authenticate with the API](https://vdr.mesta.click/docs/guide-auth.md.txt): Signing in from a script, the session cookie and the User-Agent check. - [Upload and share documents](https://vdr.mesta.click/docs/guide-upload.md.txt): File rules, malware scanning, previews and watermarked downloads. - [Members and permissions](https://vdr.mesta.click/docs/guide-permissions.md.txt): Who can see and do what in a room. - [Require an NDA](https://vdr.mesta.click/docs/guide-nda.md.txt): Gate a room's documents behind an agreement. - [Audit, sessions and access review](https://vdr.mesta.click/docs/guide-audit.md.txt): Evidence of who did what, and who still has access. - [Errors, pagination and limits](https://vdr.mesta.click/docs/guide-errors.md.txt): What failures look like and how to page through lists. ## Use cases - [Sell-side M&A due diligence](https://vdr.mesta.click/docs/use-case-ma.md.txt): Several bidders, one room, no leaks between them. - [Fundraising and investor updates](https://vdr.mesta.click/docs/use-case-fundraise.md.txt): Share the company's story with investors, room by room. - [Audits and regulatory reviews](https://vdr.mesta.click/docs/use-case-compliance.md.txt): Give auditors evidence without emailing attachments. ## Agents - [AI assistant](https://vdr.mesta.click/docs/ai-assistant.md.txt): The built-in agent that works inside a room. - [MCP server](https://vdr.mesta.click/docs/mcp-server.md.txt): Room tools over the Model Context Protocol. - [Agent Skills](https://vdr.mesta.click/docs/agent-skills.md.txt): A ready-made skill that teaches an agent the Mesta API. - [llms.txt and llms-full.txt](https://vdr.mesta.click/docs/llms-txt.md.txt): Machine-readable summaries for AI crawlers and agents. ## FAQ - [Frequently asked questions](https://vdr.mesta.click/docs/faq.md.txt): Short answers to what people ask most. ## Access - [Sign in](https://vdr.mesta.click/login): Email and password sign-in for invited users and organization admins - [Create an organization](https://vdr.mesta.click/signup): Public sign-up. Creates a new organization with you as its owner, after email verification ## Optional - [Full documentation](https://vdr.mesta.click/llms-full.txt): Every page above in one Markdown file, plus an index of every API operation - [Developer portal](https://vdr.mesta.click/developers): The same docs with the full REST API reference (OpenAPI 3.0) and a downloadable spec