Yes, Activitypub is free to use.

How do I install Activitypub?

Activitypub is a local plugin. Install it using npm package: activitypub-mcp and add the generated configuration snippet to your AI app's MCP config file. Then restart your AI app.

What credentials does Activitypub need?

Activitypub requires the following credentials or environment variables: ACTIVITYPUB_ENABLE_WRITES, LOG_LEVEL. You can find setup instructions on the server detail page.

What AI apps work with Activitypub?

Activitypub 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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Activitypub MCP Server

by Cameronrye

Developer ToolsUse Caution4.8MCP RegistryLocal

Free

Server data from the Official MCP Registry

Security-first, read-only-by-default MCP server for ActivityPub and the Fediverse.

About

Security-first, read-only-by-default MCP server for ActivityPub and the Fediverse.

Security Report

4.8

Use Caution4.8High Risk

This is a well-architected ActivityPub MCP server with strong security-conscious design. Write operations are opt-in and gated behind explicit configuration and authentication. The codebase demonstrates good defensive practices: input validation via Zod, comprehensive audit logging, rate limiting, proper credential handling via environment variables, and careful content sanitization. Minor code quality observations noted but do not materially impact security posture. Supply chain analysis found 3 known vulnerabilities in dependencies (0 critical, 3 high severity). Package verification found 1 issue.

3 files analyzed · 8 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.

HTTP Network Access

Connects to external APIs or services over the internet.

env_vars

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

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.

What You'll Need

Set these up before or after installing:

Enable write/mutation tools (post, reply, follow, boost, block). Off by default: read-only unless set to 'true'. See SECURITY.md.Optional

Environment variable: ACTIVITYPUB_ENABLE_WRITES

Logging verbosity: debug, info, warn, or error.Optional

Environment variable: LOG_LEVEL

How to Install

Add this to your MCP configuration file:

{
  "mcpServers": {
    "io-github-cameronrye-activitypub-mcp": {
      "env": {
        "LOG_LEVEL": "your-log-level-here",
        "ACTIVITYPUB_ENABLE_WRITES": "your-activitypub-enable-writes-here"
      },
      "args": [
        "-y",
        "activitypub-mcp"
      ],
      "command": "npx"
    }
  }
}

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Activitypub MCP Server

About

Security Report

Findings (8)Action required

Permissions Required

What You'll Need

How to Install

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