vercel-labs/agent-browser · skill-data/derive-client/SKILL.md

derive-client skillA

derive-client is agent-read markdown (skill) from vercel-labs/agent-browser: Reverse-engineer a website's internal API by recording browser traffic into a HAR file, then generate a standalone client or CLI that calls the endpoints directly, with no browser needed after the first recording. Use when asked to "derive a client", "build a CLI for <site>", "reverse engineer this site's API", "record network requests", "turn this site into an API", or when the same site will be automated repeatedly and direct HTTP calls would beat driving the browser every time..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add vercel-labs/agent-browser/derive-client@git:20260719.ad97a04
Exact content
mdr add vercel-labs/agent-browser/derive-client@sha256:ca31e7fd950cc4bd

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_oruxtvyl4wm4bist.svg)](https://markdownregistry.com/a/art_oruxtvyl4wm4bist)

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Versions

versioncommittedcommitsizeaudit
git:20260719.ad97a04 latest2026-07-19 ad97a04 5,379 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (5379 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

GitHub

vercel-labs/agent-browser · 42,060 stars · license Apache-2.0 · pushed 2026-09-06 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_oruxtvyl4wm4bist
GET https://markdownregistry.com/api/v1/resolve?ref=vercel-labs/agent-browser/derive-client
GET https://markdownregistry.com/api/v1/blob/ca31e7fd950cc4bdf65263959fdac2a8bbaa05f1cd020947944c79be4a3a0875