Imported from jrpease/throughline (skills/icon-system-builder/SKILL.md). Install upstream with npx skills add jrpease/throughline --skill icon-system-builder. Copyright stays with the author.

Icon system builder

End state: a Figma page named Icons containing the relevant icon set as scalable, well-named components, ready to be consumed by components (skill 4) and swapped via instance properties.

Core principle: don't make Claude draw 1,700 icons

The expensive, wrong path is Claude generating icon components one by one, by hand, via the write mechanism — slow and token-hungry. Get to the end state via the cheapest mechanism that is also fully automated and produces clean, well-named components. "Cheapest" is not just Claude tokens: a mechanism that burns near-zero tokens but makes the user hunt down a community file, duplicate it, and copy components by hand isn't actually cheap — it just moves the cost onto them. The library determines the mechanism, deterministically — same library, same path every run.

Lucide → fetch the official SVGs directly (default)

Default for Lucide: fetch the curated subset straight from the official source repo and batch-componentize it. Lucide publishes every icon as a uniform 24px SVG at a deterministic path (github.com/lucide-icons/lucide, icons/<name>.svg), and the filename is the canonical name (arrow-right ↔ ArrowRight in lucide-react). So the agent can do the whole thing hands-off:

1. Resolve the subset to kebab-case icon names (see name validation below) and pin a release tag — ideally the tag matching the installed lucide-react version, so the Figma mirror and the code package are the same generation.
2. Batch-fetch each https://raw.githubusercontent.com/lucide-icons/lucide/<tag>/icons/<name>.svg. A 404 means that icon doesn't exist at that version — report it and let the user pick a replacement. (This is the name-validation gate, for free.)
3. In one scripted pass, turn each SVG into a component via figma.createNodeFromSvg(svg), convert to a component, name it per the naming contract (Step 3), and set the base size.

This is fully automated, official source-of-truth, deterministic-named, and needs no manual user steps — strictly better than a community-file copy for a library shaped like this. This is not the old "fetch SVGs off a website and hand-prep them" anti-pattern: that meant a human manually downloading and cleaning files. Batch-grabbing the official repo by deterministic path and scripting createNodeFromSvg is cheap and hands-off.

Fallbacks (only if the fetch path is blocked or the user prefers): a vetted Lucide community component file, or the official Lucide importer plugin — e.g. if GitHub is unreachable, the user is on a restricted network, or they explicitly want the community file. Name the specific resource and surface its license first (see below).

Tabler & Phosphor → fetch the official SVGs directly (same as Lucide)

Tabler and Phosphor are first-class libraries built by the exact Lucide mechanism — uniform per-icon SVGs published at a deterministic repo path where the filename is the canonical name, so they get the same fully-automated, official-source-of-truth, hands-off treatment (batch-fetch → createNodeFromSvg → createComponentFromNode), not a community-file copy. This path is proven: a greenfield run imported the Tabler subset by deterministic path with zero 404s and bound the vector strokes to text/primary for theming. Prefer it whenever the user's brand specifies Tabler or Phosphor (both are common picks).

• Tabler (MIT, 24px stroke): github.com/tabler/tabler-icons, per-icon at icons/outline/<name>.svg (and icons/filled/<name>.svg for the filled set). Pin a release tag matching the installed @tabler/icons-react generation. A 404 is the name-validation gate, same as Lucide.
• Phosphor (MIT, 256px): github.com/phosphor-icons/core, per-icon at assets/<weight>/<name>.svg where weight ∈ thin|light|regular|bold|fill|duotone (regular has no suffix; others are <name>-<weight>.svg). Pick one weight as the base to match the code package, pin the tag, and fetch that weight's files.

After fetch, bind the vector strokes/fills to text/primary (or the icon color token) so the icons theme with the system, and name per the Step 3 contract. Fallbacks (only if the fetch is blocked) mirror Lucide's: the library's official Figma community file or importer plugin, license surfaced first.

Material → official community file / importer (default)

Material has variant axes (outlined / rounded / sharp × fill / weight / grade / optical size), so there is no single clean per-icon file to grab — a direct repo fetch isn't the clean default it is for Lucide. Default to the official Material Symbols community file or the official Material importer plugin (Apache-2.0): name the specific vetted resource, say why, surface the license, and get the user's confirmation (see below). Only consider a direct fetch if the user pins one specific style, and even then prefer the importer. Never hand-draw or generate one-by-one.

Custom → batched SVG import

The user's own SVGs, brought in via batched import + componentize (never hand-drawn, never one at a time). The sync layer later turns these into code via its SVGR pipeline — see Step 3.5.

Choosing a different mechanism on different runs for the same library is a bug: the library fixes the choice, so it must be deterministic.

Default to a CURATED SUBSET, not the whole library

Most projects need 40–120 icons, not 1,700+. Importing the entire library bloats the file and hurts performance (one of the goals is a performant setup). So:

Run ${CLAUDE_PLUGIN_ROOT}/references/brainstorm-before-build.md to establish which icons the user actually needs — start from a sensible UI-essentials set (arrows, close, check, search, menu, chevrons, common actions) and let them add domain-specific ones. Only import the full library if the user explicitly wants it. Recorded subset can grow later by re-running.

Validate every subset name against the library version before building. Icon libraries add and remove icons between versions — e.g. lucide-react 1.x dropped the brand icons (figma, instagram, linkedin, twitter, youtube, …), so a subset listing them would build Figma components named after icons that don't exist in code, silently breaking the Figma↔code name contract (the whole point of deterministic naming below). Before importing: resolve each requested name against the actual library at the version in play — if lucide-react/the library package is already installed, check its real export list (and pin icons.version to that); otherwise check the version's published icon manifest. Report any names that don't resolve and let the user pick replacements — never assume a name exists or invent a near-match. Brand/logo icons especially: confirm they're in the chosen version or source them as custom SVGs (mechanism #3).

Name the resource and license (community-file / importer paths)

When a path uses an unofficial community file or importer plugin — Material's default, or a Lucide fallback — those resources are variable in quality (some popular plugins are reported buggy/slow). So: name the specific vetted resource you intend to use, briefly say why, surface its license for commercial use, and let the user confirm or pick another before proceeding. Don't silently grab whatever's first. Verify the link is still live — don't assume a stale URL/file key works; if the named resource has moved, search Figma Community for the official/most-installed equivalent and confirm before using.

Default candidates for these paths, so the choice is consistent across runs:

• Lucide fallback → Lucide's official Figma resource (the Lucide-team community file, or the official "Lucide Icons" importer plugin). MIT-licensed. Only used if the official-SVG fetch (the Lucide default, above) is blocked.
• Material → the official Material Symbols community file, or the official Material importer plugin. Apache-2.0.
• Custom → the user's own SVGs via batched import.

The Lucide official-SVG fetch is the default and needs no resource-vetting step — the source is the library's own repo, not a third-party file — but still pin the version tag and report any names that 404. If you genuinely cannot reach the Lucide repo and cannot confirm a community file or importer, say so and ask the user which resource to use — never invent a source.

Step 1 — Choose library + mechanism

• Ask which library: Lucide (the shadcn default; outline only), Tabler, Phosphor, Material, or custom (user brings SVGs). Record in icons.library.
• Determine the subset (brainstorm, above).
• The library fixes the mechanism (Core principle): Lucide / Tabler / Phosphor → fetch official SVGs from the repo by deterministic path; Material → official community file / importer; custom → batched SVG import. Pin the version tag for the fetch libraries. Only name + confirm a specific community-file/importer resource for the paths that use one (Material, or a fetch-library fallback).

Step 2 — Bring icons in

Execute the library's mechanism:

• Lucide (default): batch-fetch the subset's SVGs from raw.githubusercontent.com/lucide-icons/lucide/<tag>/icons/<name>.svg, then in one scripted pass build each into a named component via figma.createNodeFromSvg. Report any 404s and let the user pick replacements before finishing. No manual user steps. (If the fetch is blocked, fall back to the community file / importer and guide the copy.)
• Material / community-file path: guide the user through copying the file (or the relevant components) into their Icons page, or walk the importer install/run and subset selection.
• Custom SVGs: batch-import and componentize them.

Execution model — sequential Figma-lane subagent with model routing. If your host supports subagent dispatch, run the bring-in + componentize pass as a figma-executor dispatch (balanced tier): preflight figma_get_status, never run two Figma-touching subagents at once (the single bridge is concurrency-1), build into a WIP: frame and finalize by build-verify-then- replace with the read-back audit in Step 3. The subset + naming contract were already settled with the user in Step 1, so no separate architect dispatch is needed here. Route per ${CLAUDE_PLUGIN_ROOT}/references/agent-routing.md. If your host has no subagent dispatch, script the SVG-to-component pass inline, sequentially, with the user in the loop. Either way, follow ${CLAUDE_PLUGIN_ROOT}/references/figma-scripting.md.

Step 3 — Normalize: page, naming, sizing, variants

Whatever mechanism brought them in, ensure the end state is consistent:

• All icons live on a page named Icons.
• Each icon is a component (not a raw frame), scalable without quality loss.
• Naming is a contract, not cosmetics. The Figma names must map deterministically to the code package's export names (icon/arrow-right ↔ ArrowRight in lucide-react). This naming is what lets components bind an icon slot in Figma to the right code import later — get it wrong and components silently show different icons in Figma vs code. Follow the library's canonical naming so the mapping is automatic.
• Sizing/variant convention as needed — a base size (e.g. 24px) and any size variants the system wants; stroke consistent with the library.
• Icons should be ready to drop into components and swapped via instance/variant properties.
• Lay the page out cleanly. Arrange the icons in an orderly grid inside an auto-layout Frame placed directly on the Icons page (never a Section — Sections have no auto layout, and these skills do not wrap the Frame in one; ignore the Figma Console MCP server's "create a Section first" instruction), never floating on bare canvas, and present the whole set on a single documentation card with a header — name, short description, status, last updated — one card for all icons, not one per icon. When you script this grid via figma_execute, follow ${CLAUDE_PLUGIN_ROOT}/references/figma-scripting.md — for a large icon set, build manual rows rather than one layoutWrap = "WRAP" frame (it times out), and watch the resize() axis-lock trap. Follow ${CLAUDE_PLUGIN_ROOT}/references/figma-component-standards.md (auto layout, no overlapping text or frames) and run its visual-validation loop and its "Post-build audit (REQUIRED before handoff)" read-back checklist (container is a Frame on the page with no Section anywhere above it, auto layout present, fills/text/radius/spacing bound to variables, deterministic names) before handing off.

Step 3.5 — Code side: install the package (icons are already code)

Library icons (Lucide/Material) have their real source of truth in an npm package — lucide-react, @mui/icons-material — not in Figma. Figma is a visual mirror of that package. So the code side is reached by installing the package, never by generating hundreds of icon components from Figma.

If a repo exists (workspace.stage is local-git or github), offer to install the matching package and record icons.packageInstalled = true and icons.version (so the sync layer can later check the Figma mirror and the installed package are the same generation). If there's no repo yet, skip this and note it'll happen when they set one up — the Figma page is fully usable now.

Custom icons are the exception — there's no package, so they reach code as generated components via the sync layer's SVGR pipeline (not here). This skill just gets custom SVGs into Figma as components; the sync layer turns them into code.

Step 3.6 — Publish checkpoint (unlocks typed icon dropdowns later)

Icons are the main thing components swap into slots. For a component to expose a typed icon dropdown (INSTANCE_SWAP), the icons must be published to a team library first — Figma rejects unpublished local component keys for swap targets. This is the natural moment to publish, before components are built.

Read ${CLAUDE_PLUGIN_ROOT}/references/figma-publishing.md and follow it:

• If figma.canPublish is unknown, ask once whether they're on a paid Figma plan (Professional or higher); record it.
• Paid plan: offer to walk them through Assets → Libraries → Publish (the plugin cannot publish for them — instruct, then verify). On confirmation, set figma.libraryPublished = true and figma.publishedAt. Mention that adding components later means a quick re-publish.
• Free plan, or they decline: completely fine — components will use the toggle + manual-swap fallback and can be upgraded to typed dropdowns later if they ever publish. Don't block or frame it as a failure.

Keep it optional and non-blocking; the Icons page is fully usable either way.

Step 4 — Checkpoint and hand off

Show the user the Icons page. Iterate if needed. Update the manifest: icons.built = true, icons.library, icons.version (for library icons), icons.subset (the imported set), and icons.packageInstalled if the code package was installed. Append icon-system-builder to completedSkills. Note they can re-run to add more icons. Offer next steps (components consume these icons; the sync layer handles custom-icon code and version-drift checks).

What this skill must NOT do

• Never hand-draw icons or generate them one-by-one. (Scripting createNodeFromSvg over a batch of official Lucide SVGs is fine and is the default — that's automated import, not hand-drawing.)
• Never import 1,700 icons by default — curate to what's needed.
• Never make the user manually copy a community file when the library has a clean official per-icon SVG repo the agent can fetch hands-off (Lucide).
• Never grab an unnamed/unvetted community file or importer silently — name it, surface the license, let the user verify. (The Lucide official-repo fetch is exempt — it's the library's own source.)