What an MCP server actually is, where your data lives, who's private it really is, and how to leave.
MCP — the Model Context Protocol — is an open standard from Anthropic that lets AI clients call external tools. Think of it like a USB-C port for AI: every MCP-compatible assistant can plug into the same set of tools.
MindVault runs a JSON-RPC 2.0 MCP server at https://mindvault.rest/api/mcp that exposes four tools: query_knowledge, get_categories, get_entries_by_category, and get_brain_summary. Any MCP-compatible AI — Claude Desktop, Cursor, Zed, or a custom agent — can call these tools in the middle of a conversation to pull your stored facts.
You don't need to know JSON-RPC to use it. You install once (see /install) and every conversation afterwards has your context baked in.
MindVault stores data in PostgreSQL on Neon. After every interview answer, GPT-4o-mini extracts structured facts — (entity, attribute, value) triples — into knowledge_entries rows keyed by your user id and the category you're working in. Each row carries a freshness timestamp so you can spot stale facts at a glance.
Raw interview transcripts are not retained long-term. The conversation is summarized to power get_brain_summary, but individual Q&A pairs aren't kept indefinitely — the structured rows are the source of truth.
Categories, freshness records, session history, and member status each live in their own table and are joined at query time. See the privacy policy for the data-flow diagram.
Yes. Strictly.
Every read of knowledge_entries passes through requireAuth and is scoped by req.userId. There is no codepath where one user can read another user's data — the filter is enforced in the query layer, not just the UI.
MindVault does not sell your data and does not use it to train third-party models. OpenAI's API is used only to extract facts from your answers at interview time — your answers are sent to OpenAI's API under their standard data-processing terms.
You can opt out of marketing emails at any time via the email_unsubscribed flag on your account. For the complete policy, see /privacy.
Two paths, depending on what you mean by "uninstall":
Disconnect only. Open claude_desktop_config.json (on macOS: ~/Library/Application Support/Claude/) and remove the "mindvault" entry from "mcpServers". Restart Claude Desktop. Your MindVault account and data stay put — re-connect anytime by pasting the snippet back.
Delete everything. Email mindvault@polsia.app from the address on your account and ask for deletion. We purge your user record, knowledge entries, session history, and member record. Usually handled within one business day.
The install / uninstall direction in detail lives on /install.