Run it before you believe it
Two implementations, a fixture kit, and an inspector that validates a package in your browser without uploading it anywhere.
busref — Python
Reference implementation. Covers all four conformance targets: package validation, import, export, and round-trip comparison.
busjs — TypeScript
Second, independent implementation with its own canonicaliser. Produces byte-identical canonical output to busref.
Package inspector
Drop a .buspkg and see the digest gates, structural checks and import report.
The file never leaves your machine.
Fixture kit
Twelve deliberately broken packages with an index declaring the behavior each one requires of a conforming receiver.
Quickstart
pip install busref
busref info cedar-street-building-a.buspkg
# profile core-intent busVersion 0.3
# ACTUATION PRESENT: 1 write bindings, highest priority 10 — handle per 19.2busref implements v0.2; the example declares v0.3. It imports anyway — all 138 entities across 14 documents, digests verified first — preserving and listing the constructs it does not know, which is the newer-MINOR rule of clause 18.2 doing its job on a real package.
The worked example is cedar-street-building-a.buspkg (21 kB).