python-security

A set of security rules that always applies when working with Python files. It covers secrets, authentication, input validation, database queries, logging, browser access, and rate limits.

In plain words
What is it for?
It guides the implementation and review of Python APIs and services. It is used to require validated inputs, safe database access, protected settings, explicit CORS, and limits on authentication requests.
Why use it?
It reduces common security mistakes such as exposed credentials, unauthenticated endpoints, SQL injection, sensitive logs, and overly broad browser permissions.

Cursor rule for Cursor

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 rules/rishapgandhi/python-skills/python-security
Clone the repo
git clone --depth 1 https://github.com/rishapgandhi/python-skills

Made for: Cursor.

Per session 149 This file is loaded in full into every session.
When invoked 149 The same file — it is already loaded in full.
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 $0.00149 $0.00149
Opus 5 $0.00075 $0.00075
Sonnet 5 $0.00030 $0.00030
Haiku 4.5 $0.00015 $0.00015

Measured yesterday against content hash 80d9ecb3bc2a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

python-security 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.

.cursor/rules/python-security.mdc · 19 lines

What it actually says

Security Rules

  • All secrets via pydantic-settings from environment — never in source
  • All API endpoints authenticated unless explicitly marked public
  • Input validation via Pydantic schemas on all endpoints
  • SQL injection prevention: ORM only, parameterised queries if raw SQL
  • Never log sensitive data (passwords, tokens, PII)
  • Use Field(repr=False) for sensitive settings fields
  • CORS configured explicitly — never allow_origins=["*"] in production
  • Rate limiting on auth endpoints

Reference: skills/common/security.md, skills/common/api-auth.md

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 · 19 lines · 149 tokens per session scan A 80d9ecb3bc2a

Subscribe to this mod's changes

python-security is a cursor rule published in the GitHub repository rishapgandhi/python-skills (4 stars, last pushed 3mo ago), licensed MIT. It adds 149 tokens to every session, about $0.0007 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.