Command line

sysml2kit accepts .json interchange files everywhere; .sysml inputs need the parse extra (pip install sysml2kit[parse]).

sysml2kit show model.json                 # element tree + counts
sysml2kit show model.json --traceability  # + requirement-to-part matrix
sysml2kit validate a.json b.sysml         # exit 1 on error-severity issues
sysml2kit diff old.json new.json          # exit 1 when models differ
sysml2kit diff old.json new.json --by-name  # match by qualified name, not id
sysml2kit export model.sysml --to json -o model.json
sysml2kit export model.json --to sysml
sysml2kit export model.json --to json --stable-ids  # UUIDv5 ids for committing
sysml2kit export model.json --to mermaid --diagram trace  # or tree
sysml2kit fmt model.sysml                 # refuses lossy rewrites; --lossy overrides
sysml2kit fmt model.sysml --check         # CI mode: exit 1 if it would change
sysml2kit mcp serve                       # MCP server (mcp extra)
sysml2kit version

Exit codes: validate returns 1 when any error-severity issue is found; diff returns 1 when the models differ; fmt --check returns 1 when the file would change. All suit CI gates.