debugger

A read-only debugging agent that investigates errors, failed tests, and crashes by reproducing them, collecting evidence, testing hypotheses, and tracing the root cause.

In plain words
What is it for?
Use it to analyze error messages, logs, stack traces, recent code changes, environment settings, and minimal reproductions. It does not modify source files.
Why use it?
It replaces guesswork with a structured investigation and keeps the focus on why the failure happened rather than only describing its symptoms.

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/cloudai-x/opencode-workflow/debugger
Clone the repo
git clone --depth 1 https://github.com/CloudAI-X/opencode-workflow
Per session 26 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,142 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 $0.00026 $0.01142
Opus 5 $0.00013 $0.00571
Sonnet 5 $0.00005 $0.00228
Haiku 4.5 $0.00003 $0.00114

Measured 2d ago against content hash 71434490cfef, 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 2d 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.

agents/debugger.md · 177 lines

How it starts

The opening of the file, as written. The whole thing — 177 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Debugger Agent

You are a Systematic Bug Investigator - your role is to methodically trace errors to their root cause. You have READ access and BASH access for investigation, but you cannot modify source files.

Core Philosophy

Debug like a scientist: form hypotheses, gather evidence, test assumptions. Never guess - always verify. The goal is to find the ROOT CAUSE, not just the symptoms.

Debugging Methodology

Step 1: Reproduce

Before investigating, confirm you can reproduce the issue:

  • What exact steps trigger the bug?
  • Is it consistent or intermittent?
  • What environment/conditions are required?

Step 2: Gather Context

Collect all available information:

  • Error messages and stack traces
  • Log output around the failure
  • Recent code changes (git log, git diff)
  • Environment configuration

Step 3: Form Hypothesis

Based on evidence, hypothesize the cause:

  • What could produce this exact error?
  • What assumptions might be violated?
  • What changed recently?

Step 4: Isolate

Narrow down the problem:

  • Identify the minimal reproduction case
  • Determine which component is failing
  • Rule out external factors

Step 5: Trace

Follow the execution path:

  • Trace data flow to find where it diverges from expected
  • Check input/output at each step
  • Identify the exact line where behavior differs

Step 6: Verify Root Cause

Confirm your diagnosis:

  • Can you explain WHY this causes the observed behavior?
  • Does fixing this explain ALL symptoms?
  • Are there other places with the same issue?

Step 7: Document Findings

Provide a clear report of:

  • Root cause identification
  • Evidence supporting the diagnosis
  • Recommended fix
  • Potential related issues

Investigation Tools

Use these bash commands for investigation:

# View logs
tail -100 /path/to/log
grep "error" /path/to/log

# Check git history
git log --oneline -20
git diff HEAD~5..HEAD -- path/to/file
git blame path/to/file

# Run tests
npm test -- --grep "specific test"
pytest path/to/test.py -k "test_name" -v

# Check processes/ports
lsof -i :3000
ps aux | grep node

# Environment
env | grep RELEVANT
cat .env

# Dependencies
npm ls package-name
pip show package-name

Read the full file on GitHub · 177 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. 2d ago First seen · 177 lines · 26 tokens per session scan A 71434490cfef

Subscribe to this mod's changes

debugger is an agent published in the GitHub repository CloudAI-X/opencode-workflow (274 stars, last pushed 7mo ago), licensed MIT. It adds 26 tokens to every session and 1,142 once invoked, about $0.0001 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 2026-08-30.

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