figma-use

# use_figma — Figma Plugin API Skill

Use `use_figma` MCP to execute JavaScript in Figma files via the Plugin API. All detailed reference docs live in `references/`.

**Always pass `skillNames: "figma-use"` when calling `use_figma`.** This is a logging parameter used to track skill usage — it does not affect execution.

**If the task involves building or updating a full page, screen, or multi-section layout in Figma from code**, also load [figma-generate-design](../figma-generate-design/SKILL.md). It provides the workflow for discovering design system components via `search_design_system`, importing them, and assembling screens incrementally. Both skills work together: this one for the API rules, that one for the screen-building workflow.

Before anything, load [plugin-api-standalone.index.md](references/plugin-api-standalone.index.md) to understand what is possible. When you are asked to write plugin API code, use this context to grep [plugin-api-standalone.d.ts](references/plugin-api-standalone.d.ts) for relevant types, methods, and properties. This is the definitive source of truth for the API surface. It is a large typings file, so do not load it all at once, grep for relevant sections as needed.

IMPORTANT: Whenever you work with design systems, start with [working-with-design-systems/wwds.md](references/working-with-design-systems/wwds.md) to understand the key concepts, processes, and guidelines for working with design systems in Figma. Then load the more specific references for components, variables, text styles, and effect styles as needed.

## 1. Critical Rules

1.  **Use `return` to send data back.** The return value is JSON-serialized automatically (objects, arrays, strings, numbers). Do NOT call `figma.closePlugin()` or wrap code in an async IIFE — this is handled for you.
2.  **Write plain JavaScript with top-level `await` and `return`.** Code is automatically wrapped in an async context. Do NOT wrap in `(async () => { ... })()`.
3.  `figma.notify()` **throws "not implemented"** — never use it
3a. `getPluginData()` / `setPluginData()` are **not supported** in `use_figma` — do not use them. Use `getSharedPluginData()` / `setSharedPluginData()` instead (these ARE supported), or track node IDs by returning them and passing them to subsequent calls.
4.  `console.log()` is NOT returned — use `return` for output
5.  **Work incrementally in small steps.** Break large operations into multiple `use_figma` calls. Validate after each step. This is the single most important practice for avoiding bugs.
6.  Colors are **0–1 range** (not 0–255): `{r: 1, g: 0, b: 0}` = red
7.  Fills/strokes are **read-only arrays** — clone, modify, reassign
8.  Font **MUST** be loaded before any text operation: `await figma.loadFontAsync({family, style})`
9.  **Pages load incrementally** — use `await figma.setCurrentPageAsync(page)` to switch pages and load their content (see Page Rules below)
10. `setBoundVariableForPaint` returns a **NEW** paint — must capture and reassign
11. `createVariable` accepts collection **object or ID string** (object preferred)
12. **`layoutSizingHorizontal/Vertical = 'FILL'` MUST be set AFTER `parent.appendChild(child)`** — setting before append throws. Same applies to `'HUG'` on non-auto-layout nodes.
13. **Position new top-level nodes away from (0,0).** Nodes appended directly to the page default to (0,0). Scan `figma.currentPage.children` to find a clear position (e.g., to the right of the rightmost node). This only applies to page-level nodes — nodes nested inside other frames or auto-layout containers are positioned by their parent. See [Gotchas](references/gotchas.md).
14. **On `use_figma` error, STOP. Do NOT immediately retry.** Failed scripts are **atomic** — if a script errors, it is not executed at all and no changes are made to the file. Read the error message carefully, fix the script, then retry. See [Error Recovery](#6-error-recovery--self-correction).
15. **MUST `return` ALL created/mutated node IDs.** Whenever a script creates new nodes or mutates existing ones on the canvas, collect every affected node ID and return them in a structured object (e.g. `return { createdNodeIds: [...], mutatedNodeIds: [...] }`). This is essential for subsequent calls to reference, validate, or clean up those nodes.
16. **Always set `variable.scopes` explicitly when creating variables.** The default `ALL_SCOPES` pollutes every property picker — almost never what you want. Use specific scopes like `["FRAME_FILL", "SHAPE_FILL"]` for backgrounds, `["TEXT_FILL"]` for text colors, `["GAP"]` for spacing, etc. See [variable-patterns.md](references/variable-patterns.md) for the full list.
17. **`await` every Promise.** Never leave a Promise unawaited — unawaited async calls (e.g. `figma.loadFontAsync(...)` without `await`, or `figma.setCurrentPageAsync(page)` without `await`) will fire-and-forget, causing silent failures or race conditions. The script may return before the async operation completes, leading to missing data or half-applied changes.

> For detailed WRONG/CORRECT examples of each rule, see [Gotchas & Common Mistakes](references/gotchas.md).

## 2. Page Rules (Critical)

**Page context resets between `use_figma` calls** — `figma.currentPage` starts on the first page each time.

### Switching pages

Use `await figma.setCurrentPageAsync(page)` to switch pages and load their content. The sync setter `figma.currentPage = page` **throws an error** in `use_figma` runtimes.

```js
// Switch to a specific page (loads its content)
const targetPage = figma.root.children.find((p) => p.name === "My Page");
await figma.setCurrentPageAsync(targetPage);
// targetPage.children is now populated

// Iterate over all pages
for (const page of figma.root.children) {
  await figma.setCurrentPageAsync(page);
  // page.children is now loaded — read or modify them here
}
```

### Across script runs

`figma.currentPage` resets to the **first page** at the start of each `use_figma` call. If your workflo