MCP Tenant Pair

Name: MCP Tenant Pair
Author: studiomeyer-io

by studiomeyer-ioversion 0.1.3i★ –iRuns on your computer

Registry nameio.studiomeyer/tenant-pair

Install

Overview

Description from the maker (original English)

Multi-user tenancy library for MCP servers. Pairs, groups, bi-temporal shared state, DSGVO erasure.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "tenant-pair": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-tenant-pair-demo"
      ]
    }
  }
}

Run this in your terminal

claude mcp add tenant-pair -- npx -y mcp-tenant-pair-demo

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "tenant-pair": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-tenant-pair-demo"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "tenant-pair": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mcp-tenant-pair-demo"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain studiomeyer.io (the registry checks domain ownership)
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32655 servers in this category
Published to the registry more recently than 86% of the other 32655 servers in this category
Basic checks equal to or better than 100% of the other 32655 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is MCP Tenant Pair safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.3) reached the registry 5 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, SuperCollider

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Part of the [StudioMeyer MCP Stack](https://studiomeyer.io) — Built in Mallorca 🌴 · ⭐ if you use it

mcp-tenant-pair

Foundation library + reference MCP server for multi-user tenancy in consumer MCP servers (couples, families, small groups). Identity-separated state, bi-temporal storage, conflict-resolver interface.

Spec: MCP 2025-06-18 License: MIT Repo layout: monorepo (npm workspaces)

packages/

lib/ mcp-tenant-pair (TypeScript library) cli/ mcp-tenant-pair-cli (commander CLI) demo/ mcp-tenant-pair-demo (reference Low-Level MCP server, stdio)

A note from us

We have been building tools and systems for ourselves for the past two years. The fact that this repo is small and has few stars is not because it is new. It is because we only just decided to share what we have built. It is not a fresh experiment, it is a long story with a recent commit.

We love building things and sharing them. We do not love social media tactics, growth hacks, or chasing stars and followers. So this repo is small. The code is real, it gets used, issues get answered. Judge for yourself.

If it helps you, sharing, testing, and feedback help us. If it could be better, an issue is more useful. If you build something with it, tell us at hello@studiomeyer.io. That genuinely makes our day.

From a small studio in Palma de Mallorca.

Why this exists

Most MCP servers today are single-user. The moment you want to share state across two or more humans (couples, families, small groups) you hit the same five sub-problems each time: pair creation, invite flow, identity-separated state, conflict resolution, voluntary leave / kick. This library solves them once, so downstream MCP servers (Pet-Platform, recipe-sharing, household, calendar) do not re-invent them.

5-Minute Quickstart

Library

import { TenantPair, SqliteTenantStore, LWWResolver } from "mcp-tenant-pair";

const tp = new TenantPair({ store: new SqliteTenantStore({ path: "./tenant-pair.sqlite" }), resolver: new LWWResolver(), });

const { pairId, inviteToken } = await tp.createPair({ creatorMemberId: "alice" }); await tp.acceptInvite({ inviteToken, memberId: "bob" });

await tp.setMemberPreference(pairId, "alice", "allergy", ["nuts"]); await tp.setSharedState(pairId, "alice", "tonight", "pizza");

const aliceConstraints = await tp.getMemberConstraints(pairId, "alice"); const shared = await tp.getSharedState(pairId);

CLI

npx mcp-tenant-pair-cli pair create --member-id alice

npx mcp-tenant-pair-cli pair invite --pair-id --member-id alice npx mcp-tenant-pair-cli state set --pair-id --member-id alice --key tonight --value pizza npx mcp-tenant-pair-cli state get --pair-id

Demo MCP server

node packages/demo/dist/server.js

or via stdio in your MCP client config

Reads MCP_TENANT_PAIR_DB env (default :memory:).

Tools (12)

Tool	readOnlyHint	destructiveHint
create_pair	false	false
invite_member	false	false
accept_invite	false	false
list_members	true	false
set_member_preferences	false	false
get_member_constraints	true	false
get_shared_state	true	false
set_shared_state	false	false
resolve_conflicts	false	true
kick_member	false	true
leave_pair	false	true
forget_member	false	true

Compatibility Matrix

Concern	Supported
MCP Spec	2025-06-18
Node	>= 20.0.0 to use it. Building this repo needs 20.19+ or 22.12+ (Vite 8).
Storage	SQLite (default), Postgres (peer-dep)
Conflict Resolver	LWWResolver (default), ManualResolver, custom (interface)
Transport	stdio (demo), library is transport-free

Storage adapters

SqliteTenantStore — default, embedded, single-process. Uses better-sqlite3 with WAL mode. Pass { path: "./pair.sqlite" } or :memory:.
PostgresTenantStore — multi-process, multi-tenant. Accepts any pg.Pool-shaped client ({ query (text, params): Promise<{rows: R[]}>, end?(): Promise }). pg is a peer dependency.

Conflict resolution

ConflictResolver is an interface. Two implementations ship:

LWWResolver — picks the row with the latest validFrom, ties broken by highest version. Throws on empty candidate list.
ManualResolver — returns no resolutions; conflicts stay pending until a human resolves them externally.

Inject your own by implementing { name: string; resolve(conflicts: Conflict[]): Resolution[] }.

Bi-temporal model

Every overwrite of a (pairId, namespace, key) triple sets valid_to on the previous active row and inserts a new row with a fresh valid_from. version is monotonic per key. This lets you replay history (getPairStateHistory) and detect concurrent writes deterministically.

Identity separation

member_state is per-member (only readable by that member via get_member_constraints). pair_state is shared (all active members can read via get_shared_state).

Writes by a member who later leaves or is kicked stay visible in shared state.

Security notes

Invite tokens are . — uuid v4 (122 bits CSPRNG entropy via node:crypto) plus a voice-readable base32 short-code (default RNG is node:crypto.randomInt, injectable for tests).
Per-pair pending-invite cap (default 25, configurable via maxPendingInvites).
Owner-only kick. Owner cannot kick themselves; use leave instead.
DSGVO Art. 17 erasure path: forgetMember(pairId, memberId) hard-deletes the member's member_state rows (allergies, dietary preferences) and nulls display_name. Membership trace (left_at) is retained for audit.
Postgres adapter rejects schema names that don't match /^a-z_{0,62}$/ at construction time (defense against SQL injection via integrator-supplied schema strings).
acceptInvite is race-safe — both adapters use atomic transactions (better-sqlite3 immediate transaction; pg BEGIN + SELECT ... FOR UPDATE).
Time is injectable (now: () => Date) for deterministic tests.

Development

npm install

npm run build npm test

Tests cover (142 + 1 conditional):

Pair creation (8)
Invite flow (10)
Invite expiry boundary (6) — accept/pending agree at the exact expires_at instant, both adapters
Member preferences (8)
Shared state (8)
Conflict resolution (13)
Resolvers (11)
Error handling (17) — exhaustive TenantPairError code coverage
Store adapters (6)
Postgres adapter (26) — schema-identifier validation, atomic transaction, fallback paths (mock pool, no live DB)
Adapter parity (6 + 1) — same operations against SQLite and Postgres produce identical results; the Postgres leg runs only when TENANT_PAIR_TEST_PG_URL/DATABASE_URL points at a reachable database and is skipped otherwise (never false-fails)
Demo server integration (9)
Round-1 regression fixes (14) — SQL-injection schema-validation, TOCTOU acceptInvite race, conflict-resolved winner-marker, asOf-clock, DSGVO erasure, CSPRNG-default

Run the cross-adapter parity suite against a real Postgres:

TENANT_PAIR_TEST_PG_URL=postgres://user:pass@host:5432/db npm test

Status

Foundation build. Reviewed (Cold-Cross-Review + MCP Factory Reviewer + Tester) — all HIGH/MEDIUM findings fixed. tsc clean (strict), 142 tests green (+1 Postgres-conditional skip). Prod dependency tree carries 0 known advisories (npm audit --omit=dev).

About StudioMeyer

StudioMeyer is an AI and design studio based in Palma de Mallorca, working with clients worldwide. We build custom websites and AI infrastructure for small and medium businesses. Production stack on Claude Agent SDK, MCP and n8n, with Sentry, Langfuse and LangGraph for observability and an in-house guard layer.

MCP Tenant Pair

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

SuperCollider

README from the maker

mcp-tenant-pair

A note from us

Why this exists

5-Minute Quickstart

Library

CLI

Demo MCP server

or via stdio in your MCP client config

Tools (12)

Compatibility Matrix

Storage adapters

Conflict resolution

Bi-temporal model

Identity separation

Security notes

Development

Status

About StudioMeyer