Log Detective MCP

MCP server implementing core log analysis tools of Log Detective for use by other agents.

The server uses the Drain3 algorithm to cluster log messages into templates and extract a representative subset of snippets, reducing large logs to a manageable size for downstream analysis.

Installation

Requires Python 3.11+.

pip install .

Or with uv:

uv pip install .

Usage

Running the server

logdetective-mcp

Or directly:

python -m logdetective_mcp.main

MCP client configuration

Claude Code

claude mcp add logdetective -- logdetective-mcp

Claude Desktop

Add to your Claude Desktop configuration file:

{
  "mcpServers": {
    "logdetective": {
      "command": "logdetective-mcp"
    }
  }
}

Tools

extract_log_snippets

Extracts representative log snippets using Drain3 clustering. The tool chunks the log into logical messages, clusters similar messages, and returns one representative snippet per cluster.

Log content can be provided in three ways (exactly one must be used):

Optional parameters:

Returns a list of Snippet objects, each with line_number (position in the original log) and text (the extracted snippet content).

Size limits

All downloaded inputs (via log_url) are limited to 100 MB regardless of format. Downloads are streamed in chunks and aborted as soon as the limit is exceeded.

Archives read via log_path are also checked against the 100 MB limit during decompression.

Compressed file support

Both tools transparently decompress archived log files. Supported formats:

• Single-file compression: .gz, .bz2, .xz, .lzma
• Archives: .zip, .tar, .tar.gz, .tar.bz2, .tar.xz

Format is detected from the file extension (or URL path). Archives must contain exactly one file.

Zip bomb protection is enforced via:

• Maximum decompressed size of 100 MB
• Maximum compression ratio of 100:1
• Pre-check of declared sizes in zip/tar headers
• No recursive decompression (nested archives are not unpacked)

Contributing

All changes to this repository must pass pre-commit checks and tests.

uv run pytest tests/