Citadel MCP Server

Historical memory results and configurations For semantic memory through MCP, install uv and pull the local embedder and optional cross-encoder reranker.

People who work with encryption, sql and vector database and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Rust.

VERIFIED ACTIVE

LAST COMMIT 2026-09-13 · ★ 3 · #57 OF 304 MAINTAINED MEMORY · VERIFIED 2026-09-18

Apache-2.0 · Rust servers · how we verify → /methodology

01 · Install Citadel

before you install - you'll need

CITADEL_KEY is optional or environment-specific per the README.

Claude Code

claude mcp add yp3y5akh0v-citadel -- uvx citadeldb-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "yp3y5akh0v-citadel": {
      "command": "uvx",
      "args": [
        "citadeldb-mcp"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license Apache-2.0 - declared in the repository

pypi package citadeldb-mcp - check the name against the project README before installing (PyPI has no namespace ownership)

registry vendor namespace dev.citadeldb - domain-verified with the official MCP registry

03 · What Citadel can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v2.5.0 · 2026-09-13

Local-first encrypted memory for AI agents. · Storage and query performance - Reduces copying and allocation in B-tree writes, transaction pages, SQL writes, JSON extraction, and encrypted page reads. Sequential…

v2.4.0 · 2026-09-12

Local-first encrypted memory for AI agents. · SQL updates and defaults - Preserves added-column defaults and row encoding during updates, including stored NULLs and changes between fixed-width and variable-width…

v2.3.0 · 2026-09-07

Local-first encrypted memory for AI agents. · SQL planning - Adds composite primary-key prefix scans and improves primary-key range and expression-index lookups. · SQL correctness - Corrects numeric, interval, and…

04 · Who maintains Citadel

Citadel is maintained by yp3y5akh0v. It's the only MCP server we track from this author; the repo dates to Mar 2026.

05 · Facts

repository: github.com/yp3y5akh0v/citadel
website: https://citadeldb.dev/
category: memory - ranked #57 of 304 actively-maintained memory servers as of 2026-09-18.
release cadence: 10+ releases in the last 90 days (latest 2026-09-13)
registry: dev.citadeldb/mcp (active, first published 2026-07-03 · 11 versions)
packages: pypi:citadeldb-mcp

06 · Citadel FAQ

What is Citadel?

Historical memory results and configurations For semantic memory through MCP, install uv and pull the local embedder and optional cross-encoder reranker.

Is Citadel still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-13 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

How do I install Citadel?

Run `uvx citadeldb-mcp`. The README documents one environment variable (CITADEL_KEY) to set first. CITADEL_KEY is optional or environment-specific per the README. You can also paste the ready-made client config above.

Does Citadel run locally?

Yes - it's a stdio server: it runs on your machine (via uvx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Citadel

Alternatives to Citadel

Maintained memory servers if Citadel isn't the fit.

Pairs well with

Servers that cover what Citadel doesn't - only shown when the pairing reason fits the companion.

More memory MCP servers · Memory MCP (yuvalsuede) · Chat Crystal · ZenBrain Memory · Local Keep · Ori Memory

More Rust MCP servers · Zenith · Unterm · Magents · Abcop · Office Oxide MCP · see all