How do I install Flatten?

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

What credentials does Flatten need?

Flatten requires the following credentials or environment variables: ANTHROPIC_API_KEY, FLATTEN_COUNT_MODEL. You can find setup instructions on the server detail page.

What AI apps work with Flatten?

Flatten 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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Flatten MCP Server

by ShayaShav

Developer ToolsUse Caution4.2MCP RegistryLocal

Free

Server data from the Official MCP Registry

Flatten Claude Code sessions: keep every prompt and event verbatim, resume at a lower token count.

About

Flatten Claude Code sessions: keep every prompt and event verbatim, resume at a lower token count.

Security Report

4.2

Use Caution4.2High Risk

flatten-mcp is a well-designed MCP server for compacting Claude Code sessions with appropriate authentication and permission scoping. The code exhibits solid defensive practices (atomic file writes, crash-safety, input validation via Zod), though some areas lack comprehensive error handling and there is light input validation on path parameters. Permissions align well with the server's purpose: file I/O on Claude Code's session directory, network access for token counting, and environment variable access for API keys. Supply chain analysis found 3 known vulnerabilities in dependencies (0 critical, 3 high severity). Package verification found 1 issue.

4 files analyzed · 9 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.

What You'll Need

Set these up before or after installing:

Optional. If set, token savings are counted exactly via Anthropic's count_tokens endpoint instead of estimated locally.Required

Environment variable: ANTHROPIC_API_KEY

Optional. Model id used for the exact token count (default: claude-haiku-4-5-20251001).Optional

Environment variable: FLATTEN_COUNT_MODEL

How to Install

Add this to your MCP configuration file:

{
  "mcpServers": {
    "io-github-shayashav-flatten-mcp": {
      "env": {
        "ANTHROPIC_API_KEY": "your-anthropic-api-key-here",
        "FLATTEN_COUNT_MODEL": "your-flatten-count-model-here"
      },
      "args": [
        "-y",
        "flatten-mcp"
      ],
      "command": "npx"
    }
  }
}

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Flatten MCP Server

About

Security Report

Findings (9)Action required

Permissions Required

What You'll Need

How to Install

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