network-debug

A network-debugging skill that records browser requests and examines failures, response codes, and API traffic using Argus.

In plain words
What is it for?
Use it to investigate a website or API by recording its network activity, filtering requests, checking responses, and testing mocks.
Why use it?
It helps locate failed requests, missing resources, server errors, slow or unexpected API responses, and problems with mocked responses.

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/jmsa/argus/network-debug
Any agent
npx skills add Jmsa/argus --skill network-debug
Clone the repo
git clone --depth 1 https://github.com/Jmsa/argus

Made for: Claude Code, Codex.

Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 654 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 $0.00036 $0.00654
Opus 5 $0.00018 $0.00327
Sonnet 5 $0.00007 $0.00131
Haiku 4.5 $0.00004 $0.00065

Measured yesterday against content hash a029982ce844, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

network-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 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.

skills/network-debug/SKILL.md · 87 lines

How it starts

The opening of the file, as written. The whole thing — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Investigate network activity on $ARGUMENTS using the Argus MCP tools.

Steps

  1. Set up recording

    browser_launch
    tab_open { url: "$ARGUMENTS" }
    network_start_recording { targetId }
    console_start { targetId }
    
  2. Navigate and exercise the page

    tab_navigate { targetId, url: "$ARGUMENTS" }
    page_evaluate { targetId, expression: "window.scrollTo(0, document.body.scrollHeight)" }
    
  3. Inspect all requests

    network_get_requests { targetId }
    
  4. Filter to find problems

    network_get_requests { targetId, hasError: true }         ← failed/cancelled
    network_get_requests { targetId, status: 404 }            ← not found
    network_get_requests { targetId, status: 500 }            ← server errors
    network_get_requests { targetId, url: "/api/orders" }     ← specific endpoint
    network_get_requests { targetId, method: "POST" }         ← mutations
    
  5. Verify mock interception if needed

    network_add_mock {
      targetId,
      urlPattern: "https://api.example.com/**",
      responseCode: 200,
      responseBody: '{"mocked": true}'
    }
    network_list_mocks { targetId }
    page_reload { targetId }
    network_get_requests { targetId, url: "api.example.com" }
    
  6. Clean up and test real network

    network_clear_mocks { targetId }
    network_clear_requests { targetId }
    page_reload { targetId }
    network_get_requests { targetId }
    
  7. Report findings — include:

    • Failed or errored requests with status codes
    • Slow requests (high duration values)
    • Unexpected response bodies or status codes
    • Screenshot of the page state
    • Recommended fixes

Request Entry Fields

Field Description
url Full request URL
method HTTP method
status HTTP status code
mimeType Response MIME type
responseBody Response body string
duration Request duration in ms
error Error text if request failed
type Resource type (XHR, Fetch, Script, etc.)

Read the full file on GitHub · 87 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 · 87 lines · 36 tokens per session scan A a029982ce844

Subscribe to this mod's changes

network-debug is a skill published in the GitHub repository Jmsa/argus (0 stars, last pushed 5mo ago), licensed MIT. It adds 36 tokens to every session and 654 once invoked, about $0.0002 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 2026-08-31.

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