agent-browser SKILL.md skillA
agent-browser from coalesce-labs/catalyst is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add coalesce-labs/catalyst/agent-browser@git:20260826.c0ed7cfPins git:20260826.c0ed7cf in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- coalesce-labs/catalyst
- Path
plugins/dev/skills/agent-browser/SKILL.md- Versions recorded
- 4
- Latest version
- git:20260826.c0ed7cf, committed Aug 26, 2026
- First version recorded
- Mar 4, 2026
- Size
- 3,573 bytes
- Repository stars
- 20
- License
- none declared
Fast browser automation CLI for AI agents. **ALWAYS use instead of Playwright MCP tools** for web testing, screenshots, form filling, and UI verification. Use when user says "open in browser", "check the site", "take a screenshot", "fill the form", "test the UI", or any browser interaction. Also use as a fallback when a task requires visual browser interaction that CLIs and APIs cannot handle (e.g., OAuth flows, complex dashboards, visual verification).
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
# agent-browser CLI Reference ## When to use this skill **Prefer programmatic tools first** (CLIs, APIs, MCP servers). Use `agent-browser` when the task needs a **visual browser** (OAuth login, dashboards, visual verification), no CLI/API alternative exists, or the user explicitly asks to "open"/"browse"/"check the site"/"take a screenshot". **Do NOT use Playwright MCP tools.** Always use the `agent-browser` CLI instead. ## The one rule: every session is named and closed `agent-browser` runs a **persistent per-session daemon** that owns a real "Chrome for Testing" browser. That daemon **outlives the CLI** — the browser keeps running (and, on an auto-refreshing page, keeps pegging a CPU core) until something closes it. On shared fleet/worker hosts a leaked browser starves the box (CTL-1500). So: - **Every command carries `--headed --session <name>`** — a short, task-specific name (e.g. `ctl-1500-verify`, `gh-review`). Never the implicit `default` session: it collides across concurrent workers and is the hardest leak to attribute. …
Read the whole file at its exact version.
How to install
mdr add coalesce-labs/catalyst/agent-browser@sha256:85d678e2ceed6d6bThe line at the top of this page pins the label git:20260826.c0ed7cf, 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_s6tyqeg5h6hvx34x)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Mar 4, 2026 and Aug 26, 2026, about one every 58 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260826.c0ed7cf latest | 2026-08-26 | c0ed7cf | 3,573 B | A | view · diff |
| git:20260723.74fa0a8 | 2026-07-23 | 74fa0a8 | 15,053 B | A | view · diff |
| git:20260305.c0881bb | 2026-03-05 | c0881bb | 12,869 B | A | view · diff |
| git:20260304.651241b | 2026-03-04 | 651241b | 7,321 B | A | view |
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 (3573 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
coalesce-labs/catalyst · 20 stars · license none declared · pushed 2026-09-27 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_s6tyqeg5h6hvx34x GET https://markdownregistry.com/api/v1/resolve?ref=coalesce-labs/catalyst/agent-browser GET https://markdownregistry.com/api/v1/blob/85d678e2ceed6d6b203caabae5cec3294e650f48e6fe5e229ff858b96a015015
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 coalesce-labs/catalyst
Every file in coalesce-labs/catalyst