How do I install Cosmos?

Cosmos is a local plugin. Install it using npm package: @polarity-lab/cosmos-mcp and add the generated configuration snippet to your AI app's MCP config file. Then restart your AI app.

What credentials does Cosmos need?

Cosmos requires the following credentials or environment variables: COSMOS_TOKEN. You can find setup instructions on the server detail page.

What AI apps work with Cosmos?

Cosmos uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Cosmos MCP Server

by Teampolarity

Developer ToolsUse Caution4.2MCP RegistryLocal

Free

Server data from the Official MCP Registry

Personal knowledge graph every MCP client reads from and writes to. Portable across agents.

About

Personal knowledge graph every MCP client reads from and writes to. Portable across agents.

Security Report

4.2

Use Caution4.2High Risk

Cosmos-MCP is a legitimate MCP server for a personal knowledge graph platform with proper authentication via API keys. The codebase demonstrates reasonable security practices overall, including keychain integration for credential storage on macOS and environment variable support for CI. However, there are notable concerns: unvalidated user data is written directly to the graph database without sanitization, the iMessage sync requires Full Disk Access without explicitly warning users about privacy implications, and credential handling in shell scripts could expose keys in process listings. The server's broad permissions (filesystem read/write, environment variables, network HTTP) are appropriate for its stated purpose as a data aggregation and storage tool. Supply chain analysis found 4 known vulnerabilities in dependencies (0 critical, 4 high severity). Package verification found 1 issue.

5 files analyzed · 13 issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Required

This plugin requests these system permissions. Most are normal for its category.

File System Read

Reads files on your machine. Normal for tools that analyze or process local data.

File System Write

Writes or modifies files on your machine. Check that this is expected for the tool.

env_vars

Check that this permission is expected for this type of plugin.

HTTP Network Access

Connects to external APIs or services over the internet.

Shell Command Execution

Runs commands on your machine. Be cautious — only use if you trust this plugin.

system_info

Check that this permission is expected for this type of plugin.

process_spawn

Check that this permission is expected for this type of plugin.

What You'll Need

Set these up before or after installing:

pmk_ key from https://cosmos.polarity-lab.com/connectors. Optional on macOS once the system keychain is provisioned via `npx -y @polarity-lab/cosmos-mcp provision pmk_...`.Required

Environment variable: COSMOS_TOKEN

How to Install

Add this to your MCP configuration file:

{
  "mcpServers": {
    "io-github-teampolarity-cosmos-mcp": {
      "env": {
        "COSMOS_TOKEN": "your-cosmos-token-here"
      },
      "args": [
        "-y",
        "@polarity-lab/cosmos-mcp"
      ],
      "command": "npx"
    }
  }
}

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Cosmos MCP Server

About

Security Report

Findings (13)Action required

Permissions Required

What You'll Need

How to Install

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