debugging-code

An interactive debugger for examining a running program. It can pause execution, show live variables and the call stack, move through code line by line, and evaluate expressions.

In plain words
What is it for?
Use it when a program crashes, raises an unexpected exception, produces incorrect output, or reaches a surprising state. It supports Python, Go, Node.js, TypeScript, Rust, C, and C++.
Why use it?
It reveals what the program is doing at the moment a problem occurs, which can be faster than repeatedly adding logging and restarting it.

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/almogbaku/debug-skill/debugging-code
Any agent
npx skills add AlmogBaku/debug-skill --skill debugging-code
Clone the repo
git clone --depth 1 https://github.com/AlmogBaku/debug-skill

Made for: Claude Code, Codex.

Per session 79 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,652 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 $0.00079 $0.02652
Opus 5 $0.00039 $0.01326
Sonnet 5 $0.00016 $0.00530
Haiku 4.5 $0.00008 $0.00265

Measured 2d ago against content hash cb00d6834230, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

debugging-code 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.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/install-dap.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/debugging-code/SKILL.md · 268 lines

How it starts

The opening of the file, as written. The whole thing — 268 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Interactive Debugger

Use when a program crashes, produces wrong output, or you need to understand exactly how execution reached a particular state — and running it again with more print statements won't give you the answer fast enough.

You can pause a running program at any point, read live variable values and the call stack at that exact moment, step forward line by line or jump to the next breakpoint, and evaluate arbitrary expressions against the live process — all without restarting.

Setup

This skill uses dap, a CLI tool that background daemon to interact with the debugger via the DAP Protocol, maintain the debugger state, so you can simply interact with it with multiple calls.

If dap isn't installed (check: command -v dap), install it NOW. Ask/notify the user before proceeding to install it.

From Homebrew (macOS)

brew install AlmogBaku/tap/dap

Installer script:

bash scripts/install-dap.sh

Install from sources:

go install github.com/AlmogBaku/debug-skill/cmd/dap@latest

This tool is open-sourced and available on GitHub, maintained and follows best practices.

Supports natively Python, Go, Node.js/TypeScript, Rust, C/C++, and any other language that supports DAP.

If a debugger backend is missing or fails to start, see references/installing-debuggers.md

For all commands and flags: dap --help or dap <cmd> --help.

Starting a Session

dap debug <file> launches the program under the debugger. Backend is auto-detected from the file extension.

Choose your starting strategy based on what you know:

  • Have a hypothesis — set a breakpoint where you expect the bug: dap debug script.py --break script.py:42
  • Conditional breakpoint — only stop when a condition is met: dap debug script.py --break "script.py:42:x > 5" ( always quote specs with conditions)
  • Multi-file app — breakpoints across modules: --break src/api/routes.py:55 --break src/models/user.py:30
  • No hypothesis, small program — walk from entry: dap debug script.py --stop-on-entry (avoid for large projects — startup code is noisy; bisect with breakpoints instead)
  • Exception, location unknowndap debug script.py --break-on-exception raised (Python) / all (Go/JS)
  • Remote processdap debug --attach host:port --backend <name>
  • Process already running (stuck server, live issue) — attach without restarting: dap debug --pid <PID> --backend <name>

    macOS + Go gotcha: dlv --pid requires SIP disabled (csrutil disable). Prefer starting the program under the debugger instead or attaching to a remote debugger!

Read the full file on GitHub · 268 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 · 268 lines · 79 tokens per session scan A cb00d6834230

Subscribe to this mod's changes

debugging-code is a skill published in the GitHub repository AlmogBaku/debug-skill (316 stars, last pushed 4mo ago), licensed MIT. It adds 79 tokens to every session and 2,652 once invoked, about $0.0004 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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