python-anti-patterns SKILL.md skillA
python-anti-patterns from jartan-llc/grimoire is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add jartan-llc/grimoire/python-anti-patterns@git:20261023.fc78225Pins git:20261023.fc78225 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- jartan-llc/grimoire
- Path
plugins/pythonica/skills/python-anti-patterns/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261023.fc78225, committed Oct 23, 2026
- First version recorded
- Jun 18, 2026
- Size
- 9,962 bytes
- Repository stars
- 3
- License
- MIT
Common Python anti-patterns and a pre-merge review checklist.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Python Anti-Patterns Checklist
A reference checklist of common mistakes and anti-patterns in Python code. Review this before finalizing implementations to catch issues early. Use it with `python-patterns` for the patterns to follow instead.
## Core Concepts
### 1. Centralize Cross-Cutting Concerns
Timeouts, retries, and configuration should live in one place, not scattered across every call site.
### 2. Separate Layers
Keep I/O, business logic, and API concerns in distinct layers. Don't mix SQL into business functions or leak ORM models to API consumers.
### 3. Handle Failures Explicitly
Catch specific exceptions, preserve partial results in batch operations, and validate inputs at boundaries.
### 4. Use the Type System
Annotate all public functions, use typed collections, and let static analysis catch bugs before runtime.
## Infrastructure Anti-Patterns
### Scattered Timeout/Retry Logic
```python
# BAD: Timeout logic duplicated everywhere
def fetch_user(user_id):
try:
return requests.get(url, timeout=30)
except Timeout:
logger.warning("Timeout fetching user")
return None
def fetch_orders(user_id):
try:
…Read the whole file at its exact version.
How to install
mdr add jartan-llc/grimoire/python-anti-patterns@sha256:ca2edfe86639a23fThe line at the top of this page pins the label git:20261023.fc78225, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_js7eqheqcsaa4wdg)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Jun 18, 2026 and Oct 23, 2026, about one every 32 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261023.fc78225 latest | 2026-10-23 | fc78225 | 9,962 B | A | view · diff |
| git:20260807.010f635 | 2026-08-07 | 010f635 | 10,029 B | A | view · diff |
| git:20260731.f6add68 | 2026-07-31 | f6add68 | 10,025 B | A | view · diff |
| git:20260705.faf6c3f | 2026-07-05 | faf6c3f | 10,003 B | A | view · diff |
| git:20260618.9d9291d | 2026-06-18 | 9d9291d | 10,004 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9962 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
jartan-llc/grimoire · 3 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_js7eqheqcsaa4wdg GET https://markdownregistry.com/api/v1/resolve?ref=jartan-llc/grimoire/python-anti-patterns GET https://markdownregistry.com/api/v1/blob/ca2edfe86639a23fc47e9a9175d8321c4e985f77bbe5e05dbf8f7bbfac320be3
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Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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