Borrowing it
Nothing to install: this file belongs to flpccabral/mcp-browser. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/flpccabral/mcp-browser/main/.claude/skills/browser-mcp-playbook-de-depuracao/SKILL.mdgit clone --depth 1 https://github.com/flpccabral/mcp-browserWrote 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.
[](https://agentmods.dev/skills/flpccabral/mcp-browser/browser-mcp-playbook-de-depuracao)<a href="https://agentmods.dev/skills/flpccabral/mcp-browser/browser-mcp-playbook-de-depuracao"><img src="https://agentmods.dev/badge/skills/flpccabral/mcp-browser/browser-mcp-playbook-de-depuracao/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.
<a href="https://agentmods.dev/skills/flpccabral/mcp-browser/browser-mcp-playbook-de-depuracao"><img src="https://agentmods.dev/badge/skills/flpccabral/mcp-browser/browser-mcp-playbook-de-depuracao.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00142 | $0.05371 |
| Opus 5 | $0.00071 | $0.02686 |
| Sonnet 5 | $0.00028 | $0.01074 |
| Haiku 4.5 | $0.00014 | $0.00537 |
Grade A, and why
browser-mcp-playbook-de-depuracao 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 11d ago.
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.
How it starts
The opening of the file, as written. The whole thing — 246 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Playbook de Depuração — browser-mcp-server
Runbook sintoma → causa → experimento para os modos de falha REAIS deste projeto, construído lendo o código (mensagens de erro, guards, timeouts) e os documentos históricos recuperáveis via git show cbc8e28:<doc>.md. Linhas verificadas em 2026-07-17 — re-confira após refactors grandes.
Quando NÃO usar esta skill
- Setup/instalação quebrada (dependências, playwright install, venv) →
browser-mcp-build-e-ambiente. - Como rodar/operar o servidor (comandos de start, modos) →
browser-mcp-executar-e-operar. - Significado de cada flag/env var →
browser-mcp-config-e-flags. - A crônica completa dos incidentes →
browser-mcp-arqueologia-de-falhas(este playbook referencia as histórias, não as reconta). - Catálogo das ferramentas de medição (network log, HAR, console) →
browser-mcp-diagnosticos-e-ferramentas. - Teoria por trás de isTrusted/CSP/MV3 →
browser-automacao-referencia. - Escrever/alterar código →
browser-mcp-contrato-de-arquiteturaebrowser-mcp-controle-de-mudancas.
Pré-triagem universal: torne o stderr visível
Todos os logs vão para stderr com prefixos [SERVER], [WS-SERVER], [EXTENSION-BRIDGE], [TOOLS] (verificado em server.py:68, websocket_server.py:91, extension_bridge.py:55, tools.py:98). Rodando sob um cliente MCP, o stderr costuma ser engolido. Antes de qualquer triagem:
cd /caminho/do/repo/mcp_browser
.venv/bin/python -m browser_mcp.server 2> /tmp/mcp_stderr.log & # ou: browser-mcp-server (console script)
tail -f /tmp/mcp_stderr.log
Duas armadilhas de "engolimento" tornam isso obrigatório — ver sintomas 7 e 8.
Mapa rápido sintoma → seção
| Sintoma | Seção |
|---|---|
| Click não faz nada / evento ignorado | 1 |
| Extensão Chrome não conecta ao WebSocket | 2 |
| Timeout esperando elemento / dropdown vazio | 3 |
| Overlay/indicador visual não aparece | 4 |
| Agente em loop / repete ação / estoura iterações | 5 |
ERROR: [Server] - ... genérico sem stack |
6 |
| Startup "funciona" mas browser não iniciou | 7 |
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.
- 11d ago First seen · 246 lines · 142 tokens per session scan A cb6b78475e3f
browser-mcp-playbook-de-depuracao is a skill published in the GitHub repository flpccabral/mcp-browser (0 stars, last pushed 1mo ago), licensed MIT. It adds 142 tokens to every session and 5,371 once invoked, about $0.0007 per session on Opus 5. 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.
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