peekdev

A local browser-debugging plugin that records masked browser sessions and makes their history available to a coding agent through MCP.

In plain words
What is it for?
Inspecting DOM history and console or network errors, reproducing sessions with Playwright, and—with permission—clicking, typing, or navigating in a live page.
Why use it?
It helps investigate bugs using what actually happened in the browser, including errors and the action before a failure.

Plugin for Claude Code

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Claude Code
/plugin marketplace add Cubenest/rrweb-stack
agentmods
npx agentmods add plugins/cubenest/rrweb-stack/peek
Clone the repo
git clone --depth 1 https://github.com/Cubenest/rrweb-stack

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

peekdev 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 yesterday.

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.

plugins/peek/.claude-plugin/plugin.json · 21 lines

What it actually says

{
  "name": "peekdev",
  "version": "0.1.0",
  "description": "Let your AI coding agent debug what already happened in your real browser. peek records masked rrweb sessions of your real browser to a local store and exposes them (DOM history, console/network errors, the action before an error, session-to-Playwright repro) to coding agents over MCP — and, with per-origin consent, can act in the live page (click/type/navigate). Local-first, stdio, no telemetry.",
  "author": { "name": "Cubenest", "url": "https://peek.cubenest.in" },
  "homepage": "https://peek.cubenest.in",
  "repository": "https://github.com/Cubenest/rrweb-stack",
  "license": "Apache-2.0",
  "keywords": [
    "mcp",
    "browser",
    "rrweb",
    "session-replay",
    "debugging",
    "forensics",
    "playwright",
    "coding-agent"
  ],
  "mcpServers": "./.mcp.json"
}
Changes

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.

  1. yesterday First seen · 21 lines scan A de3f779f690a

Subscribe to this mod's changes

peekdev is a plugin published in the GitHub repository Cubenest/rrweb-stack (7 stars, last pushed 1mo ago), licensed Apache-2.0. Its token cost is not measured: this kind of file is read by the harness, not the model. 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 2026-08-31.