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Heretek-RE

re-kaitai

by Heretek-RE
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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
A
license - permissive license
B
quality
C
maintenance

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Maintenance

–Maintainers
–Response time
–Release cycle
–Releases (12mo)
Commit activity

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