webmcp-gen SKILL.md skillA
webmcp-gen from vercel-labs/agent-browser is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add vercel-labs/agent-browser/webmcp-gen@git:20260901.c6785b8Pins git:20260901.c6785b8 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- vercel-labs/agent-browser
- Path
skill-data/webmcp-gen/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260901.c6785b8, committed Sep 1, 2026
- Size
- 3,007 bytes
- Repository stars
- 44,324
- License
- Apache-2.0
Build and validate experimental WebMCP tools for an existing web page. Use when an agent needs to expose a site's real workflows as page tools, create webmcp.init.js, define deterministic checks, or compare WebMCP with accessibility-tree automation.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Generate and validate page WebMCP tools Create a durable artifact that exposes a real page workflow through WebMCP and proves that the tool behaves like the existing UI. ## Output Save the work under: ```text artifacts/<domain>/<task>/ manifest.json webmcp.init.js eval.json eval-report.md ``` ## Workflow 1. Define the user goal, required initial page state, allowed actions, and consequential actions that need explicit confirmation. 2. Explore the page with agent-browser. Record the existing UI behavior, success signal, failure states, and recovery path. 3. Write `manifest.json` with the goal, required state, available tools, expected calls, expected UI changes, recovery cases, and excluded secrets. 4. Create `webmcp.init.js` and `eval.json`. Prefer declarative WebMCP for semantic HTML forms. Use imperative tools only when the workflow cannot be expressed declaratively. 5. Load the script before navigation: ```bash agent-browser --init-script ./webmcp.init.js open https://example.com agent-browser webmcp list agent-browser webmcp invoke <tool> --params @fixture.json ``` …
Read the whole file at its exact version.
How to install
mdr add vercel-labs/agent-browser/webmcp-gen@sha256:aca7fc9e74463aaaThe line at the top of this page pins the label git:20260901.c6785b8, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_uovposcf3p6irll4)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 1, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3007 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
vercel-labs/agent-browser · 44,324 stars · license Apache-2.0 · pushed 2026-10-20 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_uovposcf3p6irll4 GET https://markdownregistry.com/api/v1/resolve?ref=vercel-labs/agent-browser/webmcp-gen GET https://markdownregistry.com/api/v1/blob/aca7fc9e74463aaa06e3a3ecb42d6780ecb0e4fd7bb10d190a05b09bae00829f
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from vercel-labs/agent-browser
Every file in vercel-labs/agent-browser