Home / litestar-org / litestar-skills · GitHub

msgspec SKILL.md skillA

msgspec from litestar-org/litestar-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add litestar-org/litestar-skills/msgspec@git:20261104.3c5d082

Pins git:20261104.3c5d082 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: litestar-org/litestar-skills
Path: skills/msgspec/SKILL.md
Versions recorded: 9
Latest version: git:20261104.3c5d082, committed Nov 4, 2026
First version recorded: Apr 17, 2026
Size: 22,550 bytes
Repository stars: 17
License: MIT

Use when working with msgspec, Struct, Meta, msgspec.json, msgspec.msgpack, tagged unions, enc_hook, dec_hook, convert(), or Litestar DTO shapes. Not for Pydantic or ORM models — use their stack-specific skill.

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

# msgspec Skill

msgspec is a high-performance Python library for serialization, deserialization, and typed
validation. This guidance targets the `0.22.0` release.

## Code Style Rules

- Use PEP 604 for unions: `T | None` (not `Optional[T]`)
- **`from __future__ import annotations` rule** — Library/shared modules that define runtime-introspected `msgspec.Struct` subclasses should avoid postponed annotations unless the consuming tool resolves them. Consumer modules that only use Structs MAY use future annotations.
- Annotate every serialized field; only annotated attributes become Struct fields
- Use `kw_only=True` for Structs with more than 2 fields
- Put wire-name configuration on `msgspec.field(name=...)` or the Struct's `rename=`
  option; `msgspec.Meta` defines constraints and JSON Schema metadata, not field aliases

## Quick Reference

### Struct Definition and Options

```python
import msgspec

# Basic struct
class User(msgspec.Struct):
    id: int
    name: str
    email: str | None = None

# Performance options
class Event(msgspec.Struct, frozen=True, gc=False, cache_hash=True):
    """frozen=True: immutable + hashable. gc=False: skip GC tracking."""

    event_type: str
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add litestar-org/litestar-skills/msgspec@sha256:db01c49469c24e50

The line at the top of this page pins the label git:20261104.3c5d082, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_iwofn5nujmjbporw.svg)](https://markdownregistry.com/a/art_iwofn5nujmjbporw)

2 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 9 versions of this file, between Apr 17, 2026 and Nov 4, 2026, about one every 25 days.

version	committed	commit	size	audit
git:20261104.3c5d082 latest	2026-11-04	3c5d082	22,550 B	A	view · diff
git:20261020.150bdbe	2026-10-20	150bdbe	23,868 B	A	view · diff
git:20261004.d2d7b82	2026-10-04	d2d7b82	23,865 B	A	view · diff
git:20260926.70d12b8	2026-09-26	70d12b8	22,779 B	A	view · diff
git:20260807.656b60a	2026-08-07	656b60a	16,768 B	A	view · diff
git:20260723.07bc8a4	2026-07-23	07bc8a4	16,757 B	A	view · diff
git:20260606.cac7da7	2026-06-06	cac7da7	14,950 B	A	view · diff
git:20260427.355b475	2026-04-27	355b475	15,318 B	A	view · diff
git:20260417.ed09f48	2026-04-17	ed09f48	15,738 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (22550 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

GitHub

litestar-org/litestar-skills · 17 stars · license MIT · pushed 2026-11-06 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_iwofn5nujmjbporw
GET https://markdownregistry.com/api/v1/resolve?ref=litestar-org/litestar-skills/msgspec
GET https://markdownregistry.com/api/v1/blob/db01c49469c24e5048c27157e138e008c70e5cb377a27effd55850ec71418ed7

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

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.