Jgs v1 units

Skill jgsystemsconsulting/jgs-magic-sysmlv1-read-skills/skills/jgs-v1-units

Read-only SysML v1 model analysis skills for CATIA Magic: navigate, inspect, audit, report. Free to use, works with Claude Code and other agents.

Install

npx -y skills add jgsystemsconsulting/jgs-magic-sysmlv1-read-skills --skill jgs-v1-units

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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".

SKILL.md

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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 '<name>'. 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