Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/webflow/webflow-skillsnpx agentmods add skills/webflow/webflow-skills/designer-extension-commandWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/webflow/webflow-skills/designer-extension-command)<a href="https://agentmods.dev/skills/webflow/webflow-skills/designer-extension-command"><img src="https://agentmods.dev/badge/skills/webflow/webflow-skills/designer-extension-command/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/webflow/webflow-skills/designer-extension-command"><img src="https://agentmods.dev/badge/skills/webflow/webflow-skills/designer-extension-command.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00044 | $0.03864 |
| Opus 5.5 | $0.00018 | $0.01546 |
| Sonnet 5.5 | $0.00009 | $0.00773 |
| Haiku 4.5 | $0.00004 | $0.00386 |
Grade A, and why
webflow-cli:designer-extension scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 682 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Designer Extension
Create and develop Designer Extensions for Webflow with template selection, local development server, and bundling for distribution.
Important Note
ALWAYS use Bash tool for all Webflow CLI operations:
- Execute
webflow extensioncommands via Bash tool - Use Read tool to examine generated files and schema (never modify)
- Use Glob tool to discover project files
- Verify CLI installation:
webflow --version - Check authentication:
webflow auth login(if needed) - DO NOT use Webflow MCP tools for CLI workflows
- All CLI commands require proper descriptions (not context parameters)
Package Manager Detection:
- Check for lock files:
package-lock.json(npm),pnpm-lock.yaml(pnpm),yarn.lock(yarn) - If no lock file found, ask user which package manager to use (npm/pnpm/yarn)
- Use detected package manager for all install/build commands
Instructions
Phase 1: Environment Verification
- Verify CLI installed: Run
webflow --versionto confirm CLI is installed - Check project state: Check if already in an extension project (look for webflow.json with extension schema)
- Identify operation type: Determine if user wants to:
- List available templates
- Initialize new extension
- Bundle existing extension
- Serve extension locally
Phase 2: Template Listing & Selection
- List templates (if user asks or before init): Run
webflow extension list - Show available templates:
default- Basic HTML/CSS/JavaScript templatereact- React-based templatetypescript-alt- Alternative TypeScript template
- Ask user to select template if initializing new extension
Phase 3: Extension Initialization
- Choose project name: Ask user for project directory name
- Run init command: Execute
webflow extension init <project-name> <template> - Read generated schema: Use Read tool to examine webflow.json
- Show schema structure: Display the 5 schema fields:
name(required) - Extension name as it appears in WebflowapiVersion(required) - API version (2)publicDir(required) - Directory to build from (dist)appIntents(optional) - Element types that can create connectionsappConnections(optional) - Connection configurations
- Install dependencies: Run
npm installin project directory
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 682 lines · 44 tokens per session scan A b6a4d9efdc97
webflow-cli:designer-extension is a skill published in the GitHub repository webflow/webflow-skills (132 stars, last pushed 2d ago), licensed MIT. It adds 44 tokens to every session and 3,864 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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