An interactive debugger for pausing a program, setting breakpoints, stepping through code, and inspecting what the program is doing.

Use it to debug source files, pause at a chosen line, or step through tests run with tools such as Jest, Vitest, Pytest, or Mocha.

It helps locate the cause of a bug by showing the program's state at specific points instead of relying only on logs or guesses.

debug — Skill for Claude Code and Codex by samibs/skillfoundry

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.

Any agent

npx skills add samibs/skillfoundry --skill debug

Clone the repo

git clone --depth 1 https://github.com/samibs/skillfoundry

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/samibs/skillfoundry/debug/github.svg)](https://agentmods.dev/skills/samibs/skillfoundry/debug)

Your own site

<a href="https://agentmods.dev/skills/samibs/skillfoundry/debug"><img src="https://agentmods.dev/badge/skills/samibs/skillfoundry/debug/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/samibs/skillfoundry/debug"><img src="https://agentmods.dev/badge/skills/samibs/skillfoundry/debug.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 7 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 591 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00007	$0.00591
Opus 5.5	$0.00003	$0.00236
Sonnet 5.5	$0.00001	$0.00118
Haiku 4.5	$0.00001	$0.00059

Measured 1mo ago against content hash 9b421b0166a2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

debug 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 1mo 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/skills/debug/SKILL.md · 82 lines

How it starts

The opening of the file, as written. The whole thing — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Debug — Interactive Debugger

Role: Launch and control an interactive debug session for a file, test, or running process.

Usage

/debug <file>              Start debug session, paused at entry
/debug <file>:<line>       Start session with breakpoint at line
/debug test <test-file>    Debug a test file using its test runner

Examples

/debug src/auth/login.ts
/debug src/utils/parser.ts:42
/debug test src/auth/__tests__/login.test.ts

Behavior

When invoked, follow this sequence:

1. Start Session

Parse the argument to extract file path and optional line number.
If prefixed with test, detect the test runner (jest, vitest, pytest, mocha) from project config.
Call debug_start with the resolved file, runtime, and test_command if applicable.
Confirm the session started and report the paused location.

2. Set Initial Breakpoint (if line specified)

If the user provided <file>:<line>, call debug_breakpoint with action set at that line.
Then call debug_step with action continue to run to the breakpoint.
Report the paused location and surrounding code context.

3. Guide Inspection

Once paused, call debug_inspect with target scope to show local variables.
Call debug_inspect with target callstack to show the call stack.
Present findings and ask the user what to investigate next.

4. Interactive Loop

Respond to user instructions by mapping them to debug tools:

User says	Tool call
"step" / "next"	`debug_step` action=next
"step into"	`debug_step` action=into
"step out"	`debug_step` action=out
"continue"	`debug_step` action=continue
"inspect X"	`debug_inspect` target=X
"eval "	`debug_evaluate` expression=expr
"break :"	`debug_breakpoint` action=set
"breakpoints"	`debug_breakpoint` action=list
"stop" / "quit"	`debug_stop`

5. Cleanup

Always call debug_stop when the user is done or the process exits.
Report any uncaught exceptions with full stack trace and variable context.

Read the full file on GitHub · 82 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.

1mo ago First seen · 82 lines · 7 tokens per session scan A 9b421b0166a2

Subscribe to this mod's changes

debug is a skill published in the GitHub repository samibs/skillfoundry (12 stars, last pushed 14d ago), licensed MIT. It adds 7 tokens to every session and 591 once invoked, about $0.0000 per session on Opus 5.5. 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.

Claude Code Debugging ai-agents ai-coding ai-framework code-quality copilot

systemic-issue-triage

Trigger: new issue, bug report, triage, backlog, issue flood, community report, root cause, dead-end, blocked user. Attack issues by root class, never one-by-one; fixes must shrink the system, not grow it.

Gentleman-Programming/gentle-ai · 57 tokens

issue-root-resolution

Trigger: root audit, atacar la raíz, issue roots, backlog roots, mechanism map, deletion-driven fix, resolver issues de raíz, close outdated issues. Audit and resolve issue clusters by verified root cause.

Gentleman-Programming/gentle-ai · 45 tokens

rdd-defect-workflow

Trigger: RDD, receipt-driven development, review authority, receipt/lineage, correction/recovery, delivery gate/kill switch, bounded review defects. Guide work.

Gentleman-Programming/gentle-ai · 41 tokens

roam

Codebase comprehension via roam-code CLI. Use when exploring codebases, planning modifications, debugging failures, assessing PR risk, or checking architecture health. Triggers on: understanding project structure, pre-change safety checks, finding symbols/files, blast radius analysis, affected tests, health scoring…

Cranot/roam-code · 86 tokens

ring:searching-code

Forensic code search and analysis with optional Chain of Draft (CoD) ultra-concise mode. Five-phase methodology (clarification, planning, execution, analysis, synthesis) with severity assessment. Use for targeted investigation of specific patterns, bugs, or vulnerabilities. Skip for broad architecture mapping (use…

LerianStudio/ring · 74 tokens

memorix-troubleshooting

Use when Memorix MCP, setup, project binding, HTTP control plane, hooks, skills, or agent integration is missing, stale, or failing.

AVIDS2/memorix · 36 tokens