debug-standalone-agent-browser

A debugging guide for testing Dormouse's standalone mode with a browser-based agent-browser harness. It covers starting the development app, observing logs, and controlling the interface.

In plain words
What is it for?
It helps launch a fresh standalone run, inspect sidecar and browser logs, drive the UI, and clear old browser sessions.
Why use it?
It provides a defined way to investigate standalone browser behavior and deal with stale nested browser sessions.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/diffplug/dormouse/debug-standalone-agent-browser
Any agent
npx skills add diffplug/dormouse --skill debug-standalone-agent-browser
Clone the repo
git clone --depth 1 https://github.com/diffplug/dormouse

Made for: Claude Code, Codex.

Per session 75 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,434 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown 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 $0.00075 $0.03434
Opus 5 $0.00037 $0.01717
Sonnet 5 $0.00015 $0.00687
Haiku 4.5 $0.00007 $0.00343

Measured yesterday against content hash db9ddb26da5b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

debug-standalone-agent-browser scanned grade A with 1 finding 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.

Makes network callslowCapability

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

- starts a localhost HTTP/SSE bridge for browser-side `PlatformAdapter` calls, gated by a per-run token it bakes into the bridge URL the page is built against (`VITE_DORMOUSE_BROWSER_DEV_HOST`) — not into the page's own
.claude/skills/debug-standalone-agent-browser/SKILL.md · 212 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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 · 212 lines · 75 tokens per session scan A db9ddb26da5b

Subscribe to this mod's changes

debug-standalone-agent-browser is a skill published in the GitHub repository diffplug/dormouse (5 stars, last pushed yesterday), with no licence file. It adds 75 tokens to every session and 3,434 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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