re-kaitai
MCP server exposing Kaitai Struct for custom binary format reverse engineering.
README
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 |
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.
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