Cairn.ink Memory MCP Server

Lightweight cross-session memory for AI agents, with receipts. Walkthrough · Known limitations · Privacy · Hosted service

Teams that work with memory, provenance and cairn ink and want a hosted endpoint instead of running a local process. The project is written in JavaScript.

VERIFIED ACTIVE

LAST COMMIT 2026-09-29 · ★ 17 · #235 OF 321 MAINTAINED MEMORY · VERIFIED 2026-09-30

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

01 · Install Cairn.ink Memory

before you install - you'll need

CAIRN_MCP_TOKEN

Environment variables documented in the project's README - it lists which are required and which have defaults.

Claude Code

claude mcp add cairn-ink-cairn-memory --transport http https://cairn.ink/api/mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "cairn-ink-cairn-memory": {
      "url": "https://cairn.ink/api/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

https://cairn.ink/api/mcp

transport: streamable-http

endpoint alive - authentication required · probed 2026-09-30

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 remote - your agent's requests go to cairn.ink

endpoint auth requires authentication - rejected our unauthenticated MCP initialize

repo age created 2026-09-04 - young repo, little track record yet

license Apache-2.0 - declared in the repository

registry vendor namespace ink.cairn - domain-verified with the official MCP registry

03 · Who maintains Cairn.ink Memory

Cairn.ink Memory is maintained by cairn-ink. It's the only MCP server we track from this author; the repo dates to Sep 2026.

04 · Facts

repository: github.com/cairn-ink/cairn-memory
website: https://cairn.ink/
category: memory - ranked #235 of 321 actively-maintained memory servers as of 2026-09-30.
registry: ink.cairn/memory (active, first published 2026-09-25)

05 · Cairn.ink Memory FAQ

What is Cairn.ink Memory?

Lightweight cross-session memory for AI agents, with receipts. Walkthrough · Known limitations · Privacy · Hosted service

Is Cairn.ink Memory still maintained?

Yes - as of 2026-09-30, its last commit was 2026-09-29. We re-verify nightly.

How do I install Cairn.ink Memory?

Run `claude mcp add cairn-ink-cairn-memory --transport http https://cairn.ink/api/mcp`. The README documents one environment variable (CAIRN_MCP_TOKEN) to set first. You can also paste the ready-made client config above.

Does Cairn.ink Memory require authentication?

Yes - when we probed the endpoint on 2026-09-30, it rejected an unauthenticated MCP initialize; you'll need credentials to connect.

06 · Alternatives to Cairn.ink Memory

Alternatives to Cairn.ink Memory

Maintained memory servers if Cairn.ink Memory isn't the fit.

Pairs well with

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

More memory MCP servers · Cairn Remembers · Memoir · Openchronicle MCP · Memorydetective · Hypermnesia MCP

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