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mcp-aside-devtools

mcp-aside-devtools is a skill for Claude Code, OpenCode from MichelKerkmeester/skilled-agent-harness_spec-driven-loops. It costs 33 tokens per session (5,736 once invoked), scanned C, original, MIT.

A browser automation connector for Aside, combining natural-language browser tasks with a step-by-step JavaScript interface similar to Playwright.

In plain words
What is it for?
It is for opening pages, taking screenshots, inspecting browser state, filling forms, and carrying out multi-step browser tasks.
Why use it?
It supports both goal-based browser work and repeatable browser actions, including workflows that use signed-in sessions or saved credentials.

Skill for Claude CodeOpenCode

Written for Claude Code and OpenCode: allowed-tools in frontmatter, but also installed under .opencode/. Also seen: mentions AGENTS.md.

not rated 35repo +1 changed today C scan 33 tokens original MIT

Good fit It is for opening pages, taking screenshots, inspecting browser state, filling forms, and carrying out multi-step browser tasks.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/mcp-aside-devtools
View source ↗ MichelKerkmeester/skilled-agent-harness_spec-driven-loops
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.

Any agent
npx skills add MichelKerkmeester/skilled-agent-harness_spec-driven-loops --skill mcp-aside-devtools
Clone the repo
git clone --depth 1 https://github.com/MichelKerkmeester/skilled-agent-harness_spec-driven-loops

Made for: Claude Code, OpenCode.

Wrote 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.

agentmods badge for mcp-aside-devtools

README.md
[![agentmods](https://agentmods.dev/badge/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/mcp-aside-devtools/github.svg)](https://agentmods.dev/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/mcp-aside-devtools)
Your own site
<a href="https://agentmods.dev/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/mcp-aside-devtools"><img src="https://agentmods.dev/badge/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/mcp-aside-devtools/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.

agentmods 80×15 button for mcp-aside-devtools

Your own site · 80×15
<a href="https://agentmods.dev/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/mcp-aside-devtools"><img src="https://agentmods.dev/badge/skills/michelkerkmeester/skilled-agent-harness_spec-driven-loops/mcp-aside-devtools.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,736 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 2 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00033 $0.05736
Opus 5 $0.00016 $0.02868
Sonnet 5 $0.00007 $0.01147
Haiku 4.5 $0.00003 $0.00574

Measured today against content hash 3a2540b61e08, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade C, and why

mcp-aside-devtools scanned grade C with 2 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 today.

The scan reads SKILL.md. This mod also ships 4 executable files (examples/agent-task-session.sh, examples/mcp-handshake-probe.sh, examples/repl-evidence-capture.sh, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

The command surface is version-pinned evidence. Re-capture `--help` before relying on any flag; never freeze flag spellings from memory. If the binary is absent, report the official install command (`curl -fsSL https://r

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

"INSTALL": {"weight": 4, "keywords": ["install", "setup", "set up", "not installed", "curl", "sign in", "sign-in", "getting started", "not found", "first time", "command -v aside"]},
.opencode/skills/mcp-tooling/mcp-aside-devtools/SKILL.md · 370 lines

How it starts

The opening of the file, as written. The whole thing — 370 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Aside Browser Orchestrator - CLI + MCP Integration

AI-browser automation through the Aside CLI: natural-language agent tasks and a deterministic Playwright-compatible JavaScript REPL, with the Aside MCP server via Code Mode as the composition fallback.

1. WHEN TO USE

Activation Triggers

Use when:

  • User mentions "aside", "aside browser", "AI browser" automation explicitly
  • User wants a goal-driven, multi-step browser task delegated to a browser agent ("book, fill, compare, sign in and download")
  • User needs deterministic, evidence-friendly browser steps (open a tab, snapshot, screenshot) through aside repl
  • User mentions "aside cli", "aside exec", "aside repl", or "aside mcp" explicitly
  • User wants browser work that leverages a signed-in Aside account, profile sessions, or password-manager autofill
  • Browser operations must be chained with other Code Mode tools through the Aside MCP repl surface

Automatic Triggers:

  • "aside", "aside cli", "aside mcp" mentioned explicitly
  • "AI browser automation" or "browser agent task"
  • "natural language browser task"

When NOT to Use

Do not use for:

  • Chrome/Chromium/Edge debugging with raw CDP primitives, HAR export, or bdg (use mcp-chrome-devtools — Aside has no CDP-domain parity and no dedicated console/network tools)
  • Extracting a measured Style Reference (design tokens) from a live website's real CSS (use sk-design-md-generator)
  • Application-code implementation the browser merely verifies (use sk-code)
  • Cross-browser test suites or heavyweight frameworks (use Playwright/Puppeteer/Selenium directly)
  • Non-macOS hosts — the official installer supports macOS (Darwin) arm64/x64 only
  • Fully unattended sensitive account actions — MFA, CAPTCHA, vault unlock, and approvals pause tasks and require a human

2. SMART ROUTING

Read the full file on GitHub · 370 lines

Files

What ships with it

60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. today Changed 3a2540b61e08
  2. 5d ago Changed 5b143501f7ab
  3. 6d ago First seen · 370 lines · 33 tokens per session scan C 7d66e328fbba

Subscribe to this mod's changes

mcp-aside-devtools is a skill published in the GitHub repository MichelKerkmeester/skilled-agent-harness_spec-driven-loops (35 stars, last pushed today), licensed MIT. It adds 33 tokens to every session and 5,736 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

Browser automation
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