How do I use re-kaitai?

1. Click on "Install Server". 2. Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state. 3. In the chat, type @ followed by the MCP server name and your instructions, e.g., "@re-kaitai Decode this firmware blob" That's it! The server will respond to your query, and you can continue using it as needed. Here is a step-by-step guide with screenshots.

re-kaitai

by Heretek-RE

Overview Schema Related Servers Score Discussions

Python

Local

re-kaitai

MCP server exposing Kaitai Struct for custom binary format reverse engineering.

Tools

Tool	What it does
`check_compiler`	Confirm kaitai-struct-compiler is installed
`list_known_formats`	List bundled .ksy formats
`download_format`	Download a .ksy from the kaitai-formats gallery
`compile_format`	Compile .ksy → Python at runtime
`parse_with_format`	Parse a binary with a compiled or precompiled format
`visualize`	Same as parse_with_format, named for the intent
`diff_parses`	Parse two files and return a structural diff

Related MCP server: mcp-pwntools

Install

# System dependency
brew install kaitai-struct-compiler   # macOS
scoop install kaitai-struct-compiler  # Windows
# Linux: download prebuilt from https://github.com/kaitai-io/kaitai_struct_compiler/releases

# Python
pip install kaitaistruct
pip install -e ./servers/re-kaitai

Usage pattern (in Claude Code)

1. "Decode this firmware blob"
2. Claude identifies the file magic (e.g. LZMA header)
3. Claude downloads the matching .ksy: download_format("lzma")
4. Claude compiles: compile_format("/path/lzma.ksy")
5. Claude parses: parse_with_format(path="/path/blob", ksy_path="/path/lzma.ksy")
6. Claude inspects the parse tree, iterates on the .ksy, re-parses

The Kaitai workflow is iterative: compile → parse → fix the schema → re-compile → parse again.

Install Server

license - permissive license

quality

maintenance

How are these scores calculated?

Maintenance

–Maintainers

–Response time

–Release cycle

–Releases (12mo)

Commit activity

Resources

GitHub Repository

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