A set of rules for a development workflow called PUDO: Plan, Understand, Develop, and Optimize. The rules cover scope, reading files before editing, small changes, testing, and quality checks.

Use it to guide non-trivial Cursor agent tasks from planning through implementation and review. It is meant for work that needs clear success criteria, focused changes, and quality gates.

It gives coding work a repeatable process and helps prevent unsupported assumptions, unrelated edits, and missing tests. It also defines what should be checked before moving between phases.

pudo-core — Cursor rule for Cursor by DongDuong2001/pudo-code-system

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.

Clone the repo

git clone --depth 1 https://github.com/DongDuong2001/pudo-code-system

Made for: Cursor.

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.

README.md

[![agentmods](https://agentmods.dev/badge/rules/dongduong2001/pudo-code-system/pudo-core/github.svg)](https://agentmods.dev/rules/dongduong2001/pudo-code-system/pudo-core)

Your own site

<a href="https://agentmods.dev/rules/dongduong2001/pudo-code-system/pudo-core"><img src="https://agentmods.dev/badge/rules/dongduong2001/pudo-code-system/pudo-core/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.

Your own site · 80×15

<a href="https://agentmods.dev/rules/dongduong2001/pudo-code-system/pudo-core"><img src="https://agentmods.dev/badge/rules/dongduong2001/pudo-code-system/pudo-core.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 221 This file is loaded in full into every session.

When invoked 221 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00221	$0.00221
Opus 5.5	$0.00088	$0.00088
Sonnet 5.5	$0.00044	$0.00044
Haiku 4.5	$0.00022	$0.00022

Measured 2mo ago against content hash 61cfa0ebcd62, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

pudo-core 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.

cursor/.cursor/rules/pudo-core.mdc · 26 lines

What it actually says

PUDO Core

Follow the PUDO loop for non-trivial work: Plan -> Understand -> Develop -> Optimize.

Invariants

Define scope, constraints, success criteria, and out-of-scope work before implementation.
Read relevant files before editing; do not infer APIs, paths, or architecture from memory.
Keep patches small, focused, and reviewable.
Preserve user changes and avoid unrelated rewrites.
Add or update tests when behavior, user workflows, security, data, or public contracts change.
Run the most relevant available checks, or state why they were skipped.
If new information invalidates the plan, stop and re-plan.

Quality Gates

Use quality/quality-gates.md for phase exit criteria.
Use quality/qc-checklists.md for review categories.
Use quality/ai-output-review.md for AI-generated code and docs.
Use quality/edge-cases/general.md for edge case discovery.

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.

2mo ago First seen · 26 lines · 221 tokens per session scan A 61cfa0ebcd62

Subscribe to this mod's changes

pudo-core is a cursor rule published in the GitHub repository DongDuong2001/pudo-code-system (5 stars, last pushed 9d ago), licensed MIT. It adds 221 tokens to every session, about $0.0009 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 2026-08-31.

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