external-system-debugging

A debugging guide for code that interacts with outside systems you cannot fully inspect, such as browsers, editors, CDNs, web firewalls, chat services, operating systems, and SaaS APIs.

In plain words
What is it for?
Investigating copy-and-paste bugs, platform differences, unexpected third-party API results, CDN or web-firewall blocks, failed local reproductions, and lost HTML attributes during HTML-to-Markdown conversion.
Why use it?
It reduces guesswork when the problem cannot be reproduced locally or when an outside system changes the result. It requires checking real environment data before proposing fixes.

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/doccker/cc-use-exp/external-system-debugging
Any agent
npx skills add doccker/cc-use-exp --skill external-system-debugging
Clone the repo
git clone --depth 1 https://github.com/doccker/cc-use-exp

Made for: Claude Code, Codex.

Per session 124 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,726 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown 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 $0.00124 $0.01726
Opus 5 $0.00062 $0.00863
Sonnet 5 $0.00025 $0.00345
Haiku 4.5 $0.00012 $0.00173

Measured 2d ago against content hash 7d4f24e420bd, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

external-system-debugging scanned grade A 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

| HTTP 第三方 API | 完整 request/response | `curl -v` / Charles / mitmproxy;比对 GET vs POST |
.antigravity/skills/external-system-debugging/SKILL.md · 126 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

4 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 · 126 lines · 124 tokens per session scan A 7d4f24e420bd

Subscribe to this mod's changes

external-system-debugging is a skill published in the GitHub repository doccker/cc-use-exp (1,035 stars, last pushed 7d ago), with no licence file. It adds 124 tokens to every session and 1,726 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.