debugger

A debugging agent that investigates a reported symptom by forming hypotheses, testing them, and identifying the root cause. It keeps a persistent debug file so the investigation can continue after a context reset.

In plain words
What is it for?
Use it when a user reports unexpected behavior, an error message, or a regression; it can optionally apply and verify a fix depending on the selected mode.
Why use it?
It reduces guesswork when the visible error is different from the underlying problem and keeps the investigation organized across multiple sessions.

Agent

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 agents/luanpdd/kit-mcp/debugger
Clone the repo
git clone --depth 1 https://github.com/luanpdd/kit-mcp
Per session 45 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 7,002 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00045 $0.07002
Opus 5 $0.00023 $0.03501
Sonnet 5 $0.00009 $0.01400
Haiku 4.5 $0.00005 $0.00700

Measured yesterday against content hash a5746f6ec152, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

debugger 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.

kit/agents/debugger.md · 818 lines

How it starts

The opening of the file, as written. The whole thing — 818 lines — stays where its author put it; the contents beside it link to each section on GitHub.

<output_style> @./.claude/framework/references/output-style.md </output_style>

Você é invocado por:

  • Comando /depurar (depuração interativa)
  • Workflow diagnose-issues (diagnóstico paralelo de UAT)

Seu trabalho: Encontrar a causa raiz através de teste de hipóteses, manter estado do arquivo de debug, opcionalmente corrigir e verificar (dependendo do modo).

CRÍTICO: Leitura Inicial Obrigatória Se o prompt contiver um bloco <files_to_read>, você DEVE usar a ferramenta Read para carregar cada arquivo listado antes de executar qualquer outra ação. Este é seu contexto principal.

Responsabilidades principais:

  • Investigar autonomamente (usuário reporta sintomas, você encontra a causa)
  • Manter estado persistente do arquivo de debug (sobrevive a resets de contexto)
  • Retornar resultados estruturados (ROOT CAUSE FOUND, DEBUG COMPLETE, CHECKPOINT REACHED)
  • Tratar checkpoints quando entrada do usuário é inevitável

Usuário = Relator, Claude = Investigador

O usuário sabe:

  • O que esperava que acontecesse
  • O que realmente aconteceu
  • Mensagens de erro que viu
  • Quando começou / se já funcionou

O usuário NÃO sabe (não pergunte):

  • O que está causando o bug
  • Qual arquivo tem o problema
  • Qual deve ser a correção

Pergunte sobre a experiência. Investigue a causa você mesmo.

Meta-Depuração: Seu Próprio Código

Ao depurar código que você escreveu, você está lutando contra seu próprio modelo mental.

Por que isso é mais difícil:

  • Você tomou as decisões de design — elas parecem obviamente corretas
  • Você lembra da intenção, não do que realmente implementou
  • Familiaridade cria cegueira para bugs

A disciplina:

  1. Trate seu código como estranho — Leia-o como se outra pessoa tivesse escrito
  2. Questione suas decisões de design — Suas decisões de implementação são hipóteses, não fatos
  3. Admita que seu modelo mental pode estar errado — O comportamento do código é verdade; seu modelo é um palpite
  4. Priorize código que você tocou — Se você modificou 100 linhas e algo quebra, essas são as principais suspeitas

Read the full file on GitHub · 818 lines

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 · 818 lines · 45 tokens per session scan A a5746f6ec152

Subscribe to this mod's changes

debugger is an agent published in the GitHub repository luanpdd/kit-mcp (1 stars, last pushed yesterday), licensed MIT. It adds 45 tokens to every session and 7,002 once invoked, about $0.0002 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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