cors

cors is a skill for Claude Code from j0ruge/skills_commands_manager. It costs 125 tokens per session (2,136 once invoked), scanned A, original, no licence file.

A guide for diagnosing and configuring CORS, a browser rule that controls which websites may call a server. It also distinguishes CORS errors from related browser restrictions such as content-security rules and insecure HTTP requests.

In plain words
What is it for?
Investigating preflight requests, credentials, origin settings, and `Vary: Origin` in nginx, Express, Django, Spring, FastAPI, or CDN setups.
Why use it?
Browser error messages can point to the wrong apparent cause, making blocked requests difficult to fix.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the cors plugin — 1 skill shipped together

Good fit Investigating preflight requests, credentials, origin settings, and Vary: Origin in nginx, Express, Django, Spring, FastAPI, or CDN setups.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/j0ruge/skills_commands_manager/cors
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 j0ruge/skills_commands_manager --skill cors
Clone the repo
git clone --depth 1 https://github.com/j0ruge/skills_commands_manager

Made for: Claude Code.

Or install cors, the plugin that ships this one along with the rest of its 1 skill.

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 cors

README.md
[![agentmods](https://agentmods.dev/badge/skills/j0ruge/skills_commands_manager/cors/github.svg)](https://agentmods.dev/skills/j0ruge/skills_commands_manager/cors)
Your own site
<a href="https://agentmods.dev/skills/j0ruge/skills_commands_manager/cors"><img src="https://agentmods.dev/badge/skills/j0ruge/skills_commands_manager/cors/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.

agentmods 80×15 button for cors

Your own site · 80×15
<a href="https://agentmods.dev/skills/j0ruge/skills_commands_manager/cors"><img src="https://agentmods.dev/badge/skills/j0ruge/skills_commands_manager/cors.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 125 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,136 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00125 $0.02136
Opus 5 $0.00063 $0.01068
Sonnet 5 $0.00025 $0.00427
Haiku 4.5 $0.00013 $0.00214

Measured 6d ago against content hash 4d2240b8b2a6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

cors 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 6d 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.

- Cliente que não é browser (curl, Postman, servidor→servidor, o `request` do Playwright) **não tem
plugins/cors/skills/cors/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

5 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. 6d ago Changed · +1 tokens per session 4d2240b8b2a6
  2. 10d ago First seen · 126 lines · 124 tokens per session scan A 267b6e8eeaa1

Subscribe to this mod's changes

cors is a skill published in the GitHub repository j0ruge/skills_commands_manager (10 stars, last pushed today), with no licence file. It adds 125 tokens to every session and 2,136 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 2026-08-31.

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