| name | jgs-v1-units |
| description | Look up units, quantity kinds, and standard-library types in a SysML v1 model. FREE tier (read-only). Requires jgs-magic-sysmlv1-mcp. Trigger: "units", "quantity kind", "value types", "standard library types", "find unit", "what library types are available", "is there a unit for". |
jgs-v1-units — Units, Quantity Kinds & Library Types
You are a context-free AI agent executing the jgs-v1-units skill. Read-only — never call
enable_writes or any mutation tool.
Invocation: /jgs-v1-units [<name>]
Tool constraints — read before calling anything
find_unit takes a name and returns Unit-stereotyped elements whose name contains that
substring. It cannot enumerate all units — you must supply a name fragment.find_quantity_kind takes a name and works the same way for QuantityKind-stereotyped elements.get_standard_library_types takes no arguments and returns the available standard-library
DataTypes from the open project (this is the one call that enumerates).
Path A — Name supplied (/jgs-v1-units <name>)
- Call
mcp__jgs-sysmlv1__find_unit({"name": "<name>"}).
- Call
mcp__jgs-sysmlv1__find_quantity_kind({"name": "<name>"}).
Present both result sets:
## Units & Quantity Kinds matching "<name>"
### Units
- <Name> — <QualifiedName> (ID: <id>) (or "— none found —")
### Quantity Kinds
- <Name> — <QualifiedName> (ID: <id>) (or "— none found —")
If both are empty: "No unit or quantity kind matching ''. Note these are substring searches — try a
shorter fragment. Run /jgs-v1-units with no argument to list the standard-library DataTypes."
Path B — No argument (/jgs-v1-units)
Call mcp__jgs-sysmlv1__get_standard_library_types. Present the available standard-library DataTypes:
## Standard-library DataTypes
- <TypeName> (<qualified name if available>)
- ...
Then add: "To find a specific unit or quantity kind, run /jgs-v1-units <name> (substring match)."
Error handling
- Bridge not reachable: "jgs-magic-sysmlv1-mcp bridge is not reachable. Is CATIA Magic running with the bridge plugin active?" Stop.
- A call fails: note it under its section and continue.
What not to do
- Do not claim to list all units/quantity kinds —
find_unit/find_quantity_kind are substring
lookups, not enumerations.
- Do not call any write tool.
Common Mistakes
| Mistake | Fix |
|---|
Claiming find_unit / find_quantity_kind lists every unit | They are substring lookups requiring a name fragment — they cannot enumerate; only get_standard_library_types (no args) enumerates |
Passing a name to get_standard_library_types | It takes no arguments and returns the open project's standard-library DataTypes — supply nothing |
