Figbridge

Figbridge

Figma ↔ code, in both directions. Free, open source, local, and built for the community.

Figbridge is a Figma plugin + local MCP server. Open the plugin on any file, toggle the Live bridge, and any MCP-capable agent (Claude Desktop, Claude Code, Cursor, Continue, Cline…) can read screens, tokens, and components, import a whole URL into Figma, audit the imported design, diff it back against the source, and emit a patch for the source repo — over 127.0.0.1.

┌──────────┐   postMessage   ┌──────────┐   HTTP + SSE    ┌───────────────┐     stdio     ┌──────────────┐
│  Figma   │ ──────────────▶ │  Plugin  │ ──────────────▶ │  MCP Server   │ ◀──────────── │  AI agent    │
│  Desktop │                  │   UI     │   :7331/push    │  (localhost)  │   tools/call  │  (Claude …)  │
└──────────┘                  └──────────┘                 └───────────────┘               └──────────────┘

Why

Figbridge is built for the community path: free, open source, local, and useful from website capture all the way back to source patches.

Figbridge:

• Free. MIT. Runs entirely on your machine.
• No account, no token. Uses your existing Figma desktop session.
• 48 MCP tools. Read, catalog, write-back, lint, ship an agent handoff bundle, import a live URL into Figma, audit the imported design across 5 dimensions, round-trip changes back to a source repo as a patch, and run a closed visual-diff loop that brings a running app into line with its mockup.
• Import diagnostics before you wait. preflight_import flags bot pages, deep DOM, low-res images, SVG-heavy pages, and downloadable font assets before a full import.
• Hybrid fallback for hard pages. import_url({ hybridSnapshot: true }) can place a full-page screenshot reference under editable layers for video-heavy or generated sites where pixel fidelity matters.
• Chrome/Edge current-tab capture. Load chrome-extension/ unpacked to send visible viewports, full pages, selected elements, authenticated tabs, localhost, or staging pages directly to the local bridge.
• Offline agent bundle. get_agent_bundle produces a zip (hierarchy · tokens · components · AGENTS.md · CHANGES.md) an agent can ship from without a live MCP connection.
• Deterministic. No LLM rewrites. What you select is what you get.
• Live. Toggle "Live bridge" and every selection change auto-pushes; agents pull the current selection instantly.

Install — ~3 minutes

The plugin is not in Figma Community yet, so you clone the repo to get it. The MCP server comes from npm.

# 1. Get the Figma plugin (clone the repo)
git clone https://github.com/rudraptpsingh/figbridge

# 2. Patch Claude Desktop's MCP config
npx figbridge-mcp init

Then:

1. Quit and reopen Claude Desktop — it only reads MCP config at launch.
2. In Figma: Plugins → Development → Import plugin from manifest… → pick the plugin/manifest.json from the clone above. (One-time.)
3. Run the Figbridge plugin on any frame, toggle Live bridge on. A green dot in the plugin header = connected to the local bridge. The footer shows the port.
4. In Claude: "What tools does figbridge expose?" — you should see 40+.

For any other MCP client (Cursor, Cline, VS Code, …), point it at the same binary: npx figbridge-mcp.

Via the MCP registry

Figbridge is also listed on the official Model Context Protocol registry as io.github.rudraptpsingh/figbridge. Clients that support the registry (Claude Desktop, Cursor, VS Code) can discover and install it without hand-editing config.

Troubleshooting

If Claude Desktop shows "Server disconnected" or port 7331 gets stuck, run:

npx figbridge-mcp doctor

It reaps orphan figbridge-mcp processes and reports which ports are alive. The bridge auto-falls-back to 7332..7340 if 7331 is held, and the plugin auto-probes the same range — so "port in use" won't block you. FIGBRIDGE_PORT=NNNN overrides the preferred starting port.

For long local agent sessions that drive Figma through POST /command, run a persistent bridge:

npx figbridge-mcp bridge

This starts only the local HTTP+SSE bridge and keeps it alive after stdin closes. Use this when a desktop/terminal tool starts short-lived commands but you want the Figma plugin connection to remain stable across multiple agent actions.

Updating

init writes a config that runs npx -y figbridge-mcp@latest, so every Claude Desktop launch pulls the current version — no action needed after a new release.

If you installed an older version (≤ 0.1.1) that baked an absolute path into your config, run this once to self-heal:

npx figbridge-mcp@latest update

Use npx figbridge-mcp init --pin if you'd rather lock to the currently installed copy (no auto-updates). npx figbridge-mcp --version prints the installed version.

MCP tools

Read (8) — get_current_selection · get_last_export · list_history · get_tokens · bridge_status · diff_since · list_pages · list_frames

Catalog (8) — list_screens · list_components · describe_screen · export_app_spec · export_all_pages · list_assets · select_node · export_node

Act & Handoff (5) — get_agent_bundle · clone_screen · recolor · apply_tokens · lint_ds

Browser (11) — preflight_import (risk check before import, including font download URLs), import_url (live URL → Figma frame; optional hybridSnapshot screenshot reference), import_responsive_set (desktop / tablet / mobile and optional light / dark theme captures), import_url_batch (bulk URL imports), screenshot_url, probe_url, fingerprint_url, audit_interactions (hover / focus discovery), verify_text_fidelity, measure_fidelity, audit_regression (baseline URL vs candidate URL frontend/UI regression audit)

Pillar 1 — Round-trip editing (2) — diff_to_source (per-text-node field diff between imported frame and live source) · generate_patch (turn the diff into a minimal HTML/JSX/etc patch against a source dir; style swaps get structured CSS-file hints)

Pillar 2 — Design intelligence audits (5) — audit_palette · audit_typography · audit_a11y (WCAG 2.x contrast, landmarks, alt text) · audit_whitespace (padding/gap rhythm, 4/8-grid conformance) · audit_mobile (multi-viewport responsive: horizontal scroll, overflow-x, sub-44px touch targets, sub-12px text)

Pillar 3 — Match the mockup (3) — match_mockup (closed render → diff → refine loop: renders a running app and its target mockup, returns per-viewport visual scores plus a prioritized punch-list of copy / color / typography / spacing / elevation / icon / structure differences, a design-language style fingerprint, and — with sourceDir — the source file to edit for each item) · diff_specs (fast structured field-level diff between two rendered URLs) · map_components (index an app's source tree — data-testid / component → file, plus design tokens — so diffs name the file to change and the token a literal should become)

All audits are pure deterministic measurement — no model calls. They return numeric scores and structured issue lists ready to feed back into a planning loop. audit_regression can be used as a local/CI gate before shipping a UI change: it compares screenshots, missing visible text, responsive issue deltas, and CSS-feature drift across desktop/tablet/mobile.

Chrome current-tab capture

The chrome-extension/ folder contains an unpacked MV3 extension for authenticated pages:

1. Open chrome://extensions, enable Developer mode, and load the chrome-extension/ folder unpacked.
2. Start Figbridge MCP and open the Figbridge Figma plugin with Live bridge enabled.
3. Use the extension popup to send the visible viewport, opt into full-page DOM capture, pick a page element, or include a viewport screenshot reference beneath editable layers.

Browser captures can group each website or project into its own Figma page, for example Chrome Capture - Raycast or Chrome Capture - Localhost, so separate projects stay navigable inside one open Figma file.

The extension only posts to 127.0.0.1:7331..7340; it does not send page data to a cloud service.

The agent handoff bundle

get_agent_bundle is the differentiator. One call returns a zip:

DESIGN.md          palette · rhythm · do/don't
hierarchy.md       indented tree with deterministic slugs
components.json    variants + props schema
tokens.json        DTCG-shaped
tokens.css         :root + per-mode blocks
flow.mmd           Figma prototype → Mermaid graph
responsive.md      mobile/tablet/desktop merged
ISSUES.md          a11y audit the agent shouldn't repeat
CHANGES.md         surgical diff since last bundle
AGENTS.md          "when you see slug X, import Y"
manifest.json      sha-256 + token counts, stable order for prompt cache
screenshots/       1:1 paired with hierarchy slugs

Three budget tiers (small 8k / medium 32k / large 128k tokens). Slugs are deterministic — rename a node, the slug stays — so CHANGES.md is a real surgical diff instead of a whole-file retranslation.

The closed loop: URL → Figma → diff → patch

Figbridge is the first MCP-native tool that closes the loop in both directions.

                 import_url                      diff_to_source
   ┌──────────┐  ──────────▶  ┌──────────┐  ──────────▶  ┌──────────┐
   │  Source  │                │  Figma   │                │  changes │
   │  (URL,   │                │  frame   │                │   list   │
   │   repo)  │ ◀──────────    │ (edited) │                └────┬─────┘
   └──────────┘  generate_patch└──────────┘                     │
                                                                ▼
                                                         apply or review

1. import_url pulls a live URL into a Figma page (multi-page aware via pageName; section-aware via rootSelector).
2. Audit the result with the five Pillar 2 tools to find palette drift, contrast failures, off-grid spacing, mobile breakage. Use audit_regression to compare production/staging against a local candidate and catch UI/UX regressions before updating Figma or shipping code.
3. The designer edits the frame in Figma.
4. diff_to_source reports exactly which text-node fields diverged from the source URL — characters / fontSize / fontFamily / color / presence.
5. generate_patch turns the diff into a minimal before/after edit list against a local source directory. Style swaps get structured hints (token vs literal) instead of blind text replacements.

No LLM rewrites in the loop. Every step is deterministic and idempotent.

Output formats

| Format | Shape | |---|---| | HTML + CSS | Self-contained document, positional layout preserving pixel fidelity. | | Tailwind | Same tree with Tailwind arbitrary-value utilities (w-[120px], bg-[#ff7a29]) + CDN script. | | Design tokens | DTCG JSON tree, :root { --var: value } CSS, Tailwind config fragment. Reads Figma Variables + local paint styles. |

Architecture

• Plugin main thread (plugin/code.js) — reads the node tree, computes HTML/CSS/Tailwind/tokens deterministically. ES2017-safe (no spread / ?? / ?.) for the Figma sandbox.
• Plugin UI (plugin/ui.html) — cream/ink/rust theme, Figma-native layer navigator, inline Commands panel with a Run button per tool.
• MCP server (mcp/src/) — stdio MCP via @modelcontextprotocol/sdk, sibling HTTP + SSE server on :7331 for plugin pushes and bidirectional commands. State in-memory + persisted to ~/.figbridge/last.json.

What Figbridge does not do

• No reach into Figma without the desktop app + plugin open. No REST API, no PAT.
• No AI code rewrites. It's a deterministic tree walker.
• No publishing to Figma or to the cloud.

Development

cd mcp && npm install && npm test        # integration smoke test
node test-agent/run.js                   # 130 unit tests on the render pipeline
node test/scenarios.mjs                  # 54 real-world scenario checks
node test/real-figma.mjs                 # 43 checks against a parsed real .fig
node test/tools-all.mjs                  # 21-tool MCP surface + e2e
node --check plugin/code.js              # plugin syntax check

Links

• Landing page: https://rudraptpsingh.github.io/figbridge/
• npm: https://www.npmjs.com/package/figbridge-mcp

License

MIT © Rudra Pratap Singh

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: rudraptpsingh
• Source: rudraptpsingh/figbridge
• License: MIT
• Homepage: https://rudraptpsingh.github.io/figbridge/

Install and usage instructions live in the source repository linked above.