python-best-practices SKILL.md skillA
This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.
python-best-practices from noesisvision/nasde-toolkit is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add noesisvision/nasde-toolkit/python-best-practices@git:20260323.75e7119Pins git:20260323.75e7119 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- noesisvision/nasde-toolkit
- Path
examples/nasde-dev-skill/variants/claude-nasde-dev-full-stack/skills/python-best-practices/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260323.75e7119, committed Mar 23, 2026
- Size
- 7,668 bytes
- Repository stars
- 14
- License
- MIT
Provides Python patterns for type-first development with dataclasses, discriminated unions, NewType, and Protocol. Must use when reading or writing Python files.
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 Best Practices
## Type-First Development
Types define the contract before implementation. Follow this workflow:
1. **Define data models** - dataclasses, Pydantic models, or TypedDict first
2. **Define function signatures** - parameter and return type hints
3. **Implement to satisfy types** - let the type checker guide completeness
4. **Validate at boundaries** - runtime checks where data enters the system
### Make Illegal States Unrepresentable
Use Python's type system to prevent invalid states at type-check time.
**Dataclasses for structured data:**
```python
from dataclasses import dataclass
from datetime import datetime
@dataclass(frozen=True)
class User:
id: str
email: str
name: str
created_at: datetime
@dataclass(frozen=True)
class CreateUser:
email: str
name: str
# Frozen dataclasses are immutable - no accidental mutation
```
**Discriminated unions with Literal:**
```python
from dataclasses import dataclass
from typing import Literal
@dataclass
class Idle:
status: Literal["idle"] = "idle"
@dataclass
class Loading:
status: Literal["loading"] = "loading"
@dataclass
class Success:
status: Literal["success"] = "success"
…Read the whole file at its exact version.
How to install
mdr add noesisvision/nasde-toolkit/python-best-practices@sha256:a856509d228b16c1The line at the top of this page pins the label git:20260323.75e7119, 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_u47iypi2fkqw7ysd)
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Versions
The registry has recorded 1 version of this file, committed on Mar 23, 2026.
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 (7668 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
noesisvision/nasde-toolkit · 14 stars · license MIT · pushed 2026-11-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_u47iypi2fkqw7ysd GET https://markdownregistry.com/api/v1/resolve?ref=noesisvision/nasde-toolkit/python-best-practices GET https://markdownregistry.com/api/v1/blob/a856509d228b16c19e66a5be12ab29988de1018036fd79f25fa53d69db872c0a
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