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 agentmods add skills/laurigates/claude-plugins/code-antipatternsnpx skills add laurigates/claude-plugins --skill code-antipatternsgit clone --depth 1 https://github.com/laurigates/claude-pluginsWrote 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/laurigates/claude-plugins/code-antipatterns)<a href="https://agentmods.dev/skills/laurigates/claude-plugins/code-antipatterns"><img src="https://agentmods.dev/badge/skills/laurigates/claude-plugins/code-antipatterns.svg" alt="Measured on agentmods" 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 | $0.00045 | $0.02104 |
| Opus 5 | $0.00023 | $0.01052 |
| Sonnet 5 | $0.00009 | $0.00421 |
| Haiku 4.5 | $0.00005 | $0.00210 |
Grade A, and why
code-antipatterns 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 today.
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 — 198 lines — stays where its author put it; the contents beside it link to each section on GitHub.
When to Use This Skill
| Use this skill when... | Use something else instead when... |
|---|---|
| Running a parallel anti-pattern scan and producing a report | Looking up the full YAML rule catalog → see REFERENCE.md |
Specifically targeting empty catches, floating promises, or || true |
Use the dedicated scanner → code-hidden-failures --track errors |
| Finding success-on-empty / silent degradation patterns | Use the dedicated scanner → code-hidden-failures --track degradation |
| Broad code-quality review across security, perf, and architecture | Run the full review delegate → code-review |
Context
- Analysis path:
$1(defaults to current directory if not specified) - JS/TS files: !
find . -type f \( -name "*.js" -o -name "*.ts" -o -name "*.jsx" -o -name "*.tsx" \) - Vue files: !
find . -name "*.vue" - Python files: !
find . -name "*.py"
Your Task
Perform comprehensive anti-pattern analysis. The mechanical detection is one
deterministic ast-grep scan over a shipped rule project — you do not re-type
sg -p '…' patterns and do not fan out agents just to run them. Your job is
the judgment: severity triage, recommendations, and fix planning on top of the
scan's structured findings.
Step 1: Run the deterministic scan
The detection catalog lives as an ast-grep rule project in
rules/ (one *.yml per pattern under rules/lib/, each with a
valid/invalid test fixture in rules/tests/). Run the whole catalog in one pass:
ast-grep scan -c ${CLAUDE_SKILL_DIR}/rules/sgconfig.yml --json=compact <path>
Each JSON finding carries ruleId, file, range (line/column), message, and
the matched text. Parse this — it is the raw finding set for every category
below. The rules cover: empty catch, console.log, var, eval/new Function,
innerHTML/outerHTML, as any / : any annotations, magic-number timers, Vue
props mutation, Python mutable defaults, bare except, global, and
type() ==.
What ships with it
29 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.
- REFERENCE.md 4.3 KB
- rules/lib/no-console-log.yml 143 B
- rules/lib/no-empty-catch.yml 248 B
- rules/lib/no-eval.yml 186 B
- rules/lib/no-innerhtml.yml 221 B
- rules/lib/no-magic-number.yml 233 B
- rules/lib/no-var.yml 139 B
- rules/lib/py-bare-except.yml 264 B
- rules/lib/py-global.yml 146 B
- rules/lib/py-mutable-default.yml 222 B
- rules/lib/py-use-isinstance.yml 196 B
- rules/lib/ts-any-annotation.yml 214 B
- rules/lib/ts-as-any.yml 149 B
- rules/lib/vue-props-mutation.yml 178 B
- rules/sgconfig.yml 701 B
- rules/tests/no-console-log-test.yml 98 B
- rules/tests/no-empty-catch-test.yml 136 B
- rules/tests/no-eval-test.yml 150 B
- rules/tests/no-innerhtml-test.yml 128 B
- rules/tests/no-magic-number-test.yml 133 B
- rules/tests/no-var-test.yml 92 B
- rules/tests/py-bare-except-test.yml 168 B
- rules/tests/py-global-test.yml 153 B
- rules/tests/py-mutable-default-test.yml 173 B
- rules/tests/py-use-isinstance-test.yml 110 B
- rules/tests/ts-any-annotation-test.yml 181 B
- rules/tests/ts-as-any-test.yml 93 B
- rules/tests/vue-props-mutation-test.yml 99 B
- scripts/tests/test-rules-project.sh 3.8 KB runs code
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.
- today First seen · 198 lines · 45 tokens per session scan A d6de49381809
code-antipatterns is a skill published in the GitHub repository laurigates/claude-plugins (57 stars, last pushed yesterday), licensed MIT. It adds 45 tokens to every session and 2,104 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 2026-09-03.
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