MCP State Sidecar

Name: MCP State Sidecar
Author: askadvaith

by askadvaithversion 0.1.0i★ –iRuns on your computer

Registry nameio.github.askadvaith/mcp-state-sidecar

Install

Overview

Description from the maker (original English)

MCP State Sidecar: durable state persistence for multi-agent AI workflows

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

PyPIPython’s uv installed (for the uvx 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": {
    "state-sidecar": {
      "command": "uvx",
      "args": [
        "mcp-state-sidecar"
      ]
    }
  }
}

Run this in your terminal

claude mcp add state-sidecar -- uvx mcp-state-sidecar

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "state-sidecar": {
      "command": "uvx",
      "args": [
        "mcp-state-sidecar"
      ]
    }
  }
}

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": {
    "state-sidecar": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "mcp-state-sidecar"
      ]
    }
  }
}

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 with the GitHub account askadvaith, which owns the repo
… 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 32712 servers in this category
Published to the registry more recently than 12% of the other 32712 servers in this category
Basic checks equal to or better than 100% of the other 32712 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 State Sidecar 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 (0.1.0) reached the registry 5 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

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

Alternatives

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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by formulahendry

MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.

Runs on your computer★ 440MITUpdated 14 months ago

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Remote Desktop Commander

by desktop-commander

Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

Runs in the cloud★ 211Updated 2 days ago

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Aiterm MCP

by kitepon

Persistent terminals and one launcher for Claude, Codex, Grok, Cursor, and Antigravity harnesses.

Runs on your computerUpdated today

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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.

MCP State Sidecar Server

An MCP-native state sidecar that externalises workflow state for distributed agent deployments.

Quite a simple idea really; instead of storing state inside agents (which breaks when processes crash, scale horizontally, or span multiple frameworks), agents write to and read from this sidecar over the Model Context Protocol (MCP). The sidecar is itself an MCP server; agents call its tools exactly the same way they call any other tool!

The server itself is built with distributed environments in mind, and natively handles concurrency, crash resilience and atomic claims in addition to being a common interface for state management between agents.

Features

Durable Key-Value Store: CRUD operations with optional TTL (Time-To-Live).
Workflow Lifecycle Registry: Centralised coordination (create, claim, checkpoint, and resume) for distributed multi-agent workers without out-of-band communication.
TTL Leases & Locks: Concurrency control to prevent race conditions and split-brain scenarios.
Audit Logging & Session Snapshotting: Audit state transitions and persist session contexts.
Multiple Backends: SQLite (with WAL mode & serialisation) and high-concurrency Redis currently supported.

Installation

Install the package via pip or your favorite Python package manager:

pip install mcp-state-sidecar

If you want to use the Redis backend:

pip install mcp-state-sidecar[redis]

Building from Source

To build and install the package from source:

Clone the repository:

   git clone https://github.com/askadvaith/MCP-State-Sidecar.git

cd MCP-State-Sidecar

2. Install build dependencies:

   pip install --upgrade build

Build the wheel and source distribution:

   python -m build

Install the package locally:

   pip install dist/mcp_state_sidecar-*.whl

Or install the package in editable mode for active development:

   pip install -e .

Quick Start

Running the Server

In a multi-agent distributed environment, you would typically run the state sidecar as an HTTP SSE service so multiple remote agents and clients can connect to it concurrently.

HTTP SSE Mode (Primary for Distributed Environments)

Start the SSE server to listen on a network port:

mcp-state-sidecar-http

By default, the server binds to 0.0.0.0 and listens on port 8000. The MCP endpoint is available at http://localhost:8000/mcp.

Stdio Mode (For Subprocess / Local Agent Execution)

Launch the server via standard input/output:

mcp-state-sidecar

Configuration

The server is configured entirely using environment variables:

Environment Variable	Default	Description
`STATE_BACKEND`	`sqlite`	Storage backend: `sqlite` or `redis`
`DB_PATH`	`state_sidecar.db`	Path to the SQLite database file
`REDIS_URL`	`redis://localhost:6379`	Redis connection URL
`SIDECAR_HOST`	`0.0.0.0`	IP host to bind the HTTP SSE server
`SIDECAR_PORT`	`8000`	Port for the HTTP SSE server

Tool Reference

Group 1 — Key-Value Store

state_set(key, value, ttl_seconds?, agent_id?): Upsert a JSON-serialisable value with optional TTL.
state_get(key): Retrieve a value (returns found=False if missing or expired).
state_delete(key): Delete a key.
state_list(prefix?): List all live keys, optionally filtered by prefix.

Group 2 — Workflow Lifecycle

workflow_create(name, tags?): Register a workflow; returns a unique run_id.
workflow_discover(tags?, status?): Find workflows filtered by tags or status.
workflow_claim(run_id, agent_id): Atomically claim a created workflow.
workflow_checkpoint(run_id, step, output): Persist step output and advance the step counter.
workflow_resume(run_id): Get full resume context including last step and all step outputs.
workflow_status(run_id): Get lightweight status (status, last step, and timestamps).
workflow_list(): List all registered workflows.

Group 3 — Lease & Concurrency Control

lease_acquire(resource_id, holder_id, ttl_seconds): Attempt to acquire an exclusive lock.
lease_release(resource_id, holder_id): Voluntarily release a held lease.
lease_renew(resource_id, holder_id, ttl_seconds): Extend lease duration without releasing.

Group 4 — Sessions & History

session_save(session_id, context): Save a snapshot of workflow context.
session_restore(session_id): Retrieve saved context after crash or handoff.
history_log(key?, n?): Retrieve the last N state-transition records with timestamps and writer IDs.

Group 5 — Observability

sidecar_health(): Liveness, backend type, uptime, and database metrics.
sidecar_reset(): Irreversibly wipe all data.

License

This project is licensed under the MIT License. See LICENSE for details.

MCP State Sidecar

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

Aiterm MCP

README from the maker

MCP State Sidecar Server

Features

Installation

Building from Source

Quick Start

Running the Server

HTTP SSE Mode (Primary for Distributed Environments)

Stdio Mode (For Subprocess / Local Agent Execution)

Configuration

Tool Reference

Group 1 — Key-Value Store

Group 2 — Workflow Lifecycle

Group 3 — Lease & Concurrency Control

Group 4 — Sessions & History

Group 5 — Observability

License