Kairn MCP Server
Status: pre-1.0. In daily use since February 2026, with 722 tests (see Development) and a published LongMemEval-S benchmark. Interfaces may still change between releases until 1.0. Feedback and issues welcome.
People who work with ai memory, developer tools and knowledge graph and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Python.
VERIFIED ACTIVE
LAST COMMIT 2026-09-07 · ★ 13 · #255 OF 304 MAINTAINED MEMORY · VERIFIED 2026-09-18
MIT · Python servers · how we verify → /methodology
01 · Install Kairn
before you install - you'll need
Set KAIRN_CACHE_SIZE, KAIRN_JWT_SECRET before connecting. KAIRN_LOG_LEVEL, KAIRN_DB_PATH are optional or environment-specific per the README.
Claude Desktop
Settings → Extensions → Install, then select the https://github.com/primeline-ai/kairn/releases/download/v0.2.1/kairn-0.2.1.mcpb .mcpb bundle02 · 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 Claude Desktop extension (.mcpb bundle)
license MIT - declared in the repository
registry namespace io.github.primeline-ai is GitHub-verified and matches the repo owner
03 · What Kairn can do
Prose above is summarized from the project's README and registry record - no invented capabilities.
Latest releases
v0.2.1 · 2026-07-07
PyPI rendering fixes: the README hero image and the benchmark scorecard's diagnosis links now use absolute GitHub URLs (PyPI cannot resolve relative paths), the status line no longer hardcodes a version, and…
v0.2.0 · 2026-07-07
First release since 0.1.0 (February). Highlights: · Fixed · Processes embedding Kairn now exit cleanly. The server closed no database connection on shutdown, so any process that ran a tool hung at interpreter exit on a…
04 · Who maintains Kairn
kairn is maintained by primeline-ai. It's the only MCP server we track from this author; the repo dates to Feb 2026.
05 · Facts
- repository
- github.com/primeline-ai/kairn
- category
- memory - ranked #255 of 304 actively-maintained memory servers as of 2026-09-18.
- release cadence
- 2 releases in the last 90 days (latest 2026-07-07)
- registry
- io.github.primeline-ai/kairn (active, first published 2026-08-24)
- packages
- mcpb:https://github.com/primeline-ai/kairn/releases/download/v0.2.1/kairn-0.2.1.mcpb
06 · Kairn FAQ
What is Kairn?
Status: pre-1.0. In daily use since February 2026, with 722 tests (see Development) and a published LongMemEval-S benchmark. Interfaces may still change between releases until 1.0. Feedback and issues welcome.
Is Kairn still maintained?
Yes - as of 2026-09-18, its last commit was 2026-09-07 and it shipped 2 releases in the last 90 days. We re-verify nightly.
07 · Alternatives to Kairn
Alternatives to Kairn
Maintained memory servers if Kairn isn't the fit.
- Codebase Memory Codebase knowledge graph for AI agents - 162 languages, sub-ms queries, 99% fewer tokens. ★ 43,715 · 2026-09-18
- Superlog Open-source agent that observes and fixes your application. Query logs, traces, metrics, incidents. ★ 1,449 · 2026-09-17
- Tradememory Protocol Tamper-evident decision audit trail and outcome-weighted memory for AI trading agents. ★ 1,419 · 2026-09-14
- Persome Local-first personal memory and model server for trusted MCP agents on macOS. ★ 1,322 · 2026-08-21
- Neo4j Memory MCP Neo4j Knowledge Graph Memory Server ★ 984 · 2026-09-09
- 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 Kairn doesn't - only shown when the pairing reason fits the companion.
More memory MCP servers · Lambdacad MCP · Pseudolife Memory · Purmemo · State Memory MCP · Titen Memory
More Python MCP servers · Hunch (prithviseran) · AI R · KiCad Tools · Hmr · Prufa MCP · see all