system-composer

# MATLAB System Composer — Programmatic Authoring Guide System Composer lets you model multi-domain architectures in MATLAB. This skill captures the correct API patterns, common gotchas, and a proven script structure for building models reliably. --- ## When to use this skill vs. `building-simulink-models` (SATK) Both skills can edit System Composer `.slx` files. They work at **different API layers** — don't mix them in one script. | Concern | This skill (architecture-modeling API) | `building-simulink-models` with `model_edit` (block-diagram API) | |---|---|---| | Component creation | `addComponent(arch, "Name")` — returns `systemcomposer.Component` | `add_block` with `type: "SubSystem"` — returns a `blk_id` | | Ports | `addPort(arch, "Name", "in", iface)` — typed, interface-aware | Bus Element blocks (`In Bus Element` / `Out Bus Element`) inside the SubSystem | | Connections | `connect(srcPort, dstPort)` — port objects | `{"op": "connect", "target": "blk_X.y1 -> blk_Y.PortName"}` | | Interface dictionaries (`.sldd`) | First-class (`createDictionary`, `addInterface`, `setInterface`) | Not addressed | | Profiles / stereotypes | First-class (`Profile.createProfile`, `addStereotype`, `applyStereotype`) | Not addressed | | Allocation sets (`.mldatx`) | First-class (`systemcomposer.allocation.createAllocationSet`) | Not addressed | | Auto-layout | **Call `Simulink.BlockDiagram.arrangeSystem` explicitly** before `save` — programmatic adds all land at (0,0) | `model_edit` runs...