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.
npx skills add aj-geddes/useful-ai-prompts --skill csrf-protectiongit clone --depth 1 https://github.com/aj-geddes/useful-ai-promptsWrote 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.
[](https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/csrf-protection)<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/csrf-protection"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/csrf-protection/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.
<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/csrf-protection"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/csrf-protection.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00036 | $0.00587 |
| Opus 5.5 | $0.00014 | $0.00235 |
| Sonnet 5.5 | $0.00007 | $0.00117 |
| Haiku 4.5 | $0.00004 | $0.00059 |
Grade A, and why
csrf-protection 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 2mo 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.
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.
How it starts
The opening of the file, as written. The whole thing — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CSRF Protection
Table of Contents
Overview
Implement comprehensive Cross-Site Request Forgery protection using synchronizer tokens, double-submit cookies, SameSite cookie attributes, and custom headers.
When to Use
- Form submissions
- State-changing operations
- Authentication systems
- Payment processing
- Account management
- Any POST/PUT/DELETE requests
Quick Start
Minimal working example:
// csrf-protection.js
const crypto = require("crypto");
const csrf = require("csurf");
class CSRFProtection {
constructor() {
this.tokens = new Map();
this.tokenExpiry = 3600000; // 1 hour
}
/**
* Generate CSRF token
*/
generateToken() {
return crypto.randomBytes(32).toString("hex");
}
/**
* Create token for session
*/
createToken(sessionId) {
const token = this.generateToken();
const expiry = Date.now() + this.tokenExpiry;
this.tokens.set(sessionId, {
// ... (see reference guides for full implementation)
Reference Guides
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| Node.js/Express CSRF Protection | Node.js/Express CSRF Protection |
| Double Submit Cookie Pattern | Double Submit Cookie Pattern |
| Python Flask CSRF Protection | Python Flask CSRF Protection |
| Frontend CSRF Implementation | Frontend CSRF Implementation |
| Origin and Referer Validation | Origin and Referer Validation |
Best Practices
✅ DO
- Use CSRF tokens for all state-changing operations
- Set SameSite=Strict on cookies
- Validate Origin/Referer headers
- Use secure, random tokens
- Implement token expiration
- Use HTTPS only
- Include tokens in AJAX requests
- Test CSRF protection
What ships with it
6 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.
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.
- 2mo ago First seen · 98 lines · 36 tokens per session scan A c11964181ca9
csrf-protection is a skill published in the GitHub repository aj-geddes/useful-ai-prompts (376 stars, last pushed 8mo ago), licensed MIT. It adds 36 tokens to every session and 587 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-09-03.
csrf-protection compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| csrf-protectionaj-geddes/useful-ai-prompts | Skill | 376 | 8mo ago | MIT | A | 36 | Claude Code, Codex |
| mem0-oss-to-platformmem0ai/mem0 | Skill | 68k | 2d ago | Apache-2.0 | A | 217 | Claude Code, Codex |
| azure-mgmt-botservice-dotnetmicrosoft/skills | Skill | 3.2k | yesterday | MIT | A | 78 | Claude Code |
| fastapi-router-pymicrosoft/skills | Skill | 3.2k | yesterday | MIT | A | 46 | Claude Code |
| dev-runtimelangwatch/langwatch | Skill | 5.0k | yesterday | Apache-2.0 | A | 172 | Claude Code |
| api-designericrisco/rsc-harness | Skill | 503 | 2d ago | MIT | A | 105 | Claude Code, Codex |
| migrate-segw-to-raparc-mcp/arc-1 | Skill | 252 | yesterday | MIT | A | 106 | Claude Code |