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 mickeyyaya/refactoring-skills --skill anti-patterns-cataloggit clone --depth 1 https://github.com/mickeyyaya/refactoring-skillsWrote 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/mickeyyaya/refactoring-skills/anti-patterns-catalog)<a href="https://agentmods.dev/skills/mickeyyaya/refactoring-skills/anti-patterns-catalog"><img src="https://agentmods.dev/badge/skills/mickeyyaya/refactoring-skills/anti-patterns-catalog/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/mickeyyaya/refactoring-skills/anti-patterns-catalog"><img src="https://agentmods.dev/badge/skills/mickeyyaya/refactoring-skills/anti-patterns-catalog.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00043 | $0.02572 |
| Opus 5 | $0.00022 | $0.01286 |
| Sonnet 5 | $0.00009 | $0.00514 |
| Haiku 4.5 | $0.00004 | $0.00257 |
Grade A, and why
anti-patterns-catalog 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 12d 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 — 175 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Software Anti-Patterns Catalog
Overview
Anti-patterns are recurring solutions that seem reasonable but cause more harm than good. Unlike code smells (surface indicators -- see detect-code-smells), anti-patterns describe complete failed solutions at class, module, or system scope. Each entry includes root cause, symptoms, and remediation with cross-references to fix skills.
When to Use
- Architecture review reveals no clear ownership of responsibilities
- A codebase is routinely described as "nobody dares touch that"
- A single change requires coordinating edits across many files/teams
- Bug fixes in one area consistently break unrelated areas
Quick Reference
| Category | Anti-Pattern | Severity | Primary Fix Skill |
|---|---|---|---|
| Design | God Object | CRITICAL | refactor-moving-features |
| Design | Golden Hammer | HIGH | design-patterns-creational-structural |
| Design | Poltergeist | MEDIUM | refactor-moving-features |
| Design | Blob | HIGH | refactor-moving-features |
| Development | Spaghetti Code | HIGH | refactor-composing-methods |
| Development | Copy-Paste Programming | HIGH | refactor-composing-methods, refactor-generalization |
| Development | Lava Flow | HIGH | refactor-composing-methods |
| Development | Boat Anchor | MEDIUM | refactor-moving-features |
| Development | Magic Numbers/Strings | MEDIUM | refactor-organizing-data |
| Development | Premature Optimization | MEDIUM | review-solid-clean-code |
| Development | Cargo Cult Programming | MEDIUM | design-patterns-behavioral |
| Architecture | Big Ball of Mud | CRITICAL | refactor-moving-features |
| Architecture | Vendor Lock-in | HIGH | design-patterns-creational-structural |
| Architecture | Singleton Overuse | HIGH | design-patterns-creational-structural |
Design Anti-Patterns
God Object
- Symptoms: 500-1000+ lines, name includes "Manager"/"Controller"/"Processor" with unbounded scope, any feature requires opening this file, 5+ unrelated method groups, untestable without mocking everything
- Root Cause: Class started small; features added to the "closest existing class" without enforcing responsibility boundaries
- Severity: CRITICAL -- single point of failure, merge conflict hotspot, primary source of Divergent Change
- Remediation: Extract Class iteratively -- group related fields/methods into cohesive clusters, promote each to its own class. See
refactor-moving-features. Related smells: Large Class, Divergent Change indetect-code-smells.
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.
- 12d ago First seen · 175 lines · 43 tokens per session scan A 69825257876d
anti-patterns-catalog is a skill published in the GitHub repository mickeyyaya/refactoring-skills (6 stars, last pushed 5mo ago), licensed MIT. It adds 43 tokens to every session and 2,572 once invoked, about $0.0002 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.
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