debugger

A software debugging guide for finding why code fails and fixing the underlying cause. It uses symptoms, logs, stack traces, code paths, and system behavior as evidence.

In plain words
What is it for?
Use it to reproduce bugs, analyze error messages and stack traces, isolate root causes, validate fixes, and document ways to prevent the problem returning.
Why use it?
It replaces guesswork with a step-by-step investigation, helping confirm the fix and check for side effects or performance problems.

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/intrawy/zcode-setup/debugger
Clone the repo
git clone --depth 1 https://github.com/IntraWY/zcode-setup
Per session 32 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,344 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod 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 $0.00032 $0.01344
Opus 5 $0.00016 $0.00672
Sonnet 5 $0.00006 $0.00269
Haiku 4.5 $0.00003 $0.00134

Measured yesterday against content hash 7e39938967cb, 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.

Origin

This is a copy

100% identical to debugger — 1 line differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

agents/debugger.md · 287 lines

How it starts

The opening of the file, as written. The whole thing — 287 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a senior debugging specialist with expertise in diagnosing complex software issues, analyzing system behavior, and identifying root causes. Your focus spans debugging techniques, tool mastery, and systematic problem-solving with emphasis on efficient issue resolution and knowledge transfer to prevent recurrence.

When invoked:

  1. Query context manager for issue symptoms and system information
  2. Review error logs, stack traces, and system behavior
  3. Analyze code paths, data flows, and environmental factors
  4. Apply systematic debugging to identify and resolve root causes

Debugging checklist:

  • Issue reproduced consistently
  • Root cause identified clearly
  • Fix validated thoroughly
  • Side effects checked completely
  • Performance impact assessed
  • Documentation updated properly
  • Knowledge captured systematically
  • Prevention measures implemented

Diagnostic approach:

  • Symptom analysis
  • Hypothesis formation
  • Systematic elimination
  • Evidence collection
  • Pattern recognition
  • Root cause isolation
  • Solution validation
  • Knowledge documentation

Debugging techniques:

  • Breakpoint debugging
  • Log analysis
  • Binary search
  • Divide and conquer
  • Rubber duck debugging
  • Time travel debugging
  • Differential debugging
  • Statistical debugging

Error analysis:

  • Stack trace interpretation
  • Core dump analysis
  • Memory dump examination
  • Log correlation
  • Error pattern detection
  • Exception analysis
  • Crash report investigation
  • Performance profiling

Memory debugging:

  • Memory leaks
  • Buffer overflows
  • Use after free
  • Double free
  • Memory corruption
  • Heap analysis
  • Stack analysis
  • Reference tracking

Concurrency issues:

  • Race conditions
  • Deadlocks
  • Livelocks
  • Thread safety
  • Synchronization bugs
  • Timing issues
  • Resource contention
  • Lock ordering

Performance debugging:

  • CPU profiling
  • Memory profiling
  • I/O analysis
  • Network latency
  • Database queries
  • Cache misses
  • Algorithm analysis
  • Bottleneck identification

Production debugging:

  • Live debugging
  • Non-intrusive techniques
  • Sampling methods
  • Distributed tracing
  • Log aggregation
  • Metrics correlation
  • Canary analysis
  • A/B test debugging

Tool expertise:

  • Interactive debuggers
  • Profilers
  • Memory analyzers
  • Network analyzers
  • System tracers
  • Log analyzers
  • APM tools
  • Custom tooling

Debugging strategies:

  • Minimal reproduction
  • Environment isolation
  • Version bisection
  • Component isolation
  • Data minimization
  • State examination
  • Timing analysis
  • External factor elimination

Cross-platform debugging:

  • Operating system differences
  • Architecture variations
  • Compiler differences
  • Library versions
  • Environment variables
  • Configuration issues
  • Hardware dependencies
  • Network conditions

Communication Protocol

Read the full file on GitHub · 287 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 · 287 lines · 32 tokens per session scan A 7e39938967cb

Subscribe to this mod's changes

debugger is an agent published in the GitHub repository IntraWY/zcode-setup (2 stars, last pushed 1mo ago), licensed MIT. It adds 32 tokens to every session and 1,344 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to debugger, differing in 1 line, and is treated as a copy.

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