browser-errors

A workflow for finding JavaScript errors in a web browser without changing the project. JavaScript is commonly used to make web pages interactive.

In plain words
What is it for?
Capturing and investigating browser-side JavaScript errors using an approach suited to the project's setup.
Why use it?
It helps detect frontend failures without adding monitoring code or modifying the application.

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/sourjya/tracepulse/browser-errors
Any agent
npx skills add sourjya/tracepulse --skill browser-errors
Clone the repo
git clone --depth 1 https://github.com/sourjya/tracepulse

Made for: Claude Code, Codex.

Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 723 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 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 $0.00000 $0.00723
Opus 5 $0.00000 $0.00362
Sonnet 5 $0.00000 $0.00145
Haiku 4.5 $0.00000 $0.00072

Measured 2d ago against content hash 7e951121f8db, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

browser-errors 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.

Sends data to an external URLmediumData exfiltration

A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.

fetch('http://127.0.0.1:9801/api/v1/errors', { method: 'POST',
skills/browser-errors/SKILL.md · 79 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

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 · 79 lines · 0 tokens per session scan B 7e951121f8db

Subscribe to this mod's changes

browser-errors is a skill published in the GitHub repository sourjya/tracepulse (3 stars, last pushed 1mo ago), with no licence file. It costs nothing until one of its globs matches a file; then it loads 723 tokens. A static security scan graded it B with 1 finding (sends data to an external url). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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