python-debugpy

python-debugpy is a skill for Claude Code, Codex from NousResearch/hermes-agent. It costs 17 tokens per session (3,617 once invoked), scanned B, original, MIT.

A set of Python debugging methods, including a local command-line debugger and a tool for connecting to running processes. A debugger pauses a program so you can step through it and inspect its values.

In plain words
What is it for?
Use it to investigate failing tests, changing collections, crashes, running daemons, subprocesses, and exceptions at their point of failure.
Why use it?
It helps explain failures that a traceback, print statements, or logs do not clarify. Remote debugging is useful for long-running services and child processes that cannot easily be restarted.

Skill for Claude CodeCodex

Which agent this was written for is unclear — built for hermes-agent. Also seen: mentions subagents; built for hermes-agent.

About the project

Hermes Agent is an AI assistant that learns from its use by creating and improving skills, retaining knowledge, searching past conversations, and adapting to its users. It is for people who want to run an agent through a terminal or messaging platforms while connecting it to different AI models and scheduled tasks.

NousResearch/hermes-agent · 242,018 stars · on GitHub · hermes-agent.nousresearch.com

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/nousresearch/hermes-agent/python-debugpy
Any agent
npx skills add NousResearch/hermes-agent --skill python-debugpy
Clone the repo
git clone --depth 1 https://github.com/NousResearch/hermes-agent

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.

agentmods badge for python-debugpy

README.md
[![agentmods](https://agentmods.dev/badge/skills/nousresearch/hermes-agent/python-debugpy.svg)](https://agentmods.dev/skills/nousresearch/hermes-agent/python-debugpy)
Your own site
<a href="https://agentmods.dev/skills/nousresearch/hermes-agent/python-debugpy"><img src="https://agentmods.dev/badge/skills/nousresearch/hermes-agent/python-debugpy.svg" alt="Measured on agentmods" height="20"></a>
Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,617 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. 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 5.1 $0.00017 $0.03617
Opus 5 $0.00009 $0.01809
Sonnet 5 $0.00003 $0.00723
Haiku 4.5 $0.00002 $0.00362

Measured 2d ago against content hash 24258d93eb08, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade B, and why

python-debugpy scanned grade B with 1 finding 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope
Origin

Copies of this mod

8 near-identical copies found in the catalogue:

skills/software-development/python-debugpy/SKILL.md · 374 lines

How it starts

The opening of the file, as written. The whole thing — 374 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Python Debugger (pdb + debugpy)

Overview

Three tools, picked by situation:

Tool When
breakpoint() + pdb Local, interactive, simplest. Add breakpoint() in the source, run normally, get a REPL at that line.
python -m pdb Launch an existing script under pdb with no source edits. Useful for quick poking.
debugpy Remote / headless / "attach to already-running process." Talks DAP, scriptable from terminal, works for long-lived processes (gateway, daemon, PTY children).

Start with breakpoint(). It's the cheapest thing that works.

When to Use

  • A test fails and the traceback doesn't reveal why a value is wrong
  • You need to step through a function and watch a collection mutate
  • A long-running process (hermes gateway, tui_gateway) misbehaves and you can't restart it
  • Post-mortem: an exception fired in prod-ish code and you want to inspect locals at the crash site
  • A subprocess / child (Python _SlashWorker, PTY bridge worker) is the actual bug site

Don't use for: things print() / logging.debug solve in under a minute, or things pytest -vv --tb=long --showlocals already reveals.

pdb Quick Reference

Inside any pdb prompt ((Pdb)):

Command Action
h / h cmd help
n next line (step over)
s step into
r return from current function
c continue
unt N continue until line N
j N jump to line N (same function only)
l / ll list source around current line / full function
w where (stack trace)
u / d move up / down in the stack
a print args of the current function
p expr / pp expr print / pretty-print expression
display expr auto-print expr on every stop
b file:line set breakpoint
b func break on function entry
b file:line, cond conditional breakpoint
cl N clear breakpoint N
tbreak file:line one-shot breakpoint
!stmt execute arbitrary Python (assignments included)
interact drop into full Python REPL in current scope (Ctrl+D to exit)
q quit

Read the full file on GitHub · 374 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 · 374 lines · 17 tokens per session scan B 24258d93eb08

Subscribe to this mod's changes

python-debugpy is a skill published in the GitHub repository NousResearch/hermes-agent (242,018 stars, last pushed today), licensed MIT. It adds 17 tokens to every session and 3,617 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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