Factum MCP Server

Every fact an agent writes carries mandatory provenance. When a source is retracted, everything derived from it is invalidated automatically - cascade retraction. When facts conflict, Factum returns Ambiguous instead of guessing.

People who need memory tools inside Claude, Cursor, VS Code, or another MCP client. The project is written in Rust.

VERIFIED ACTIVE

LAST COMMIT 2026-09-16 · ★ 3 · #277 OF 304 MAINTAINED MEMORY · VERIFIED 2026-09-18

MIT · Rust servers · how we verify → /methodology

01 · 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.

repo age created 2026-09-08 - young repo, little track record yet

license MIT - declared in the repository

registry namespace io.github.factum-project is GitHub-verified and matches the repo owner

02 · Who maintains Factum

Factum is maintained by factum-project. It's the only MCP server we track from this author; the repo dates to Sep 2026.

03 · Facts

repository
github.com/factum-project/factum
category
memory - ranked #277 of 304 actively-maintained memory servers as of 2026-09-18.
registry
io.github.factum-project/factum (active, first published 2026-09-14 · 4 versions)
packages
cargo:factum-mcp

04 · Factum FAQ

What is Factum?

Every fact an agent writes carries mandatory provenance. When a source is retracted, everything derived from it is invalidated automatically - cascade retraction. When facts conflict, Factum returns Ambiguous instead of guessing.

Is Factum still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-16. We re-verify nightly.

05 · Alternatives to Factum

Alternatives to Factum

Maintained memory servers if Factum isn't the fit.

  1. Codebase Memory Codebase knowledge graph for AI agents - 162 languages, sub-ms queries, 99% fewer tokens. ★ 43,715 · 2026-09-18
  2. Superlog Open-source agent that observes and fixes your application. Query logs, traces, metrics, incidents. ★ 1,449 · 2026-09-17
  3. Tradememory Protocol Tamper-evident decision audit trail and outcome-weighted memory for AI trading agents. ★ 1,419 · 2026-09-14
  4. Persome Local-first personal memory and model server for trusted MCP agents on macOS. ★ 1,322 · 2026-08-21
  5. Neo4j Memory MCP Neo4j Knowledge Graph Memory Server ★ 984 · 2026-09-09
  6. Projectmem Coding agent memory - one local MCP server for every project. Warns before repeating failed fixes. ★ 826 · 2026-09-15

Pairs well with

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

  1. Server Filesystem → filesystem companion filesystem · ★ 39,038
  2. Pdf MCP → filesystem companion filesystem · ★ 135

More memory MCP servers · Hicortex - AI Fleet Memory · Cortex Memory Engine · Gctrl · Surf · Haki

More Rust MCP servers · Kin · Glass · Llmtrim · Flash · mwe-MCP - Memory Wiki Engine · see all