m05-type-driven SKILL.md skillA
m05-type-driven from moeru-ai/auv is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add moeru-ai/auv/m05-type-driven@git:20260725.8a8e541Pins git:20260725.8a8e541 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- moeru-ai/auv
- Path
.agents/skills/m05-type-driven/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260725.8a8e541, committed Jul 25, 2026
- Size
- 4,517 bytes
- Repository stars
- 202
- License
- Apache-2.0
CRITICAL: Use for type-driven design. Triggers: type state, PhantomData, newtype, marker trait, builder pattern, make invalid states unrepresentable, compile-time validation, sealed trait, ZST, 类型状态, 新类型模式, 类型驱动设计.
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
# Type-Driven Design > **Layer 1: Language Mechanics** ## Core Question **How can the type system prevent invalid states?** Before reaching for runtime checks: - Can the compiler catch this error? - Can invalid states be unrepresentable? - Can the type encode the invariant? --- ## Error → Design Question | Pattern | Don't Just Say | Ask Instead | |---------|----------------|-------------| | Primitive obsession | "It's just a string" | What does this value represent? | | Boolean flags | "Add an is_valid flag" | Can states be types? | | Optional everywhere | "Check for None" | Is absence really possible? | | Validation at runtime | "Return Err if invalid" | Can we validate at construction? | --- ## Thinking Prompt Before adding runtime validation: 1. **Can the type encode the constraint?** - Numeric range → bounded types or newtypes - Valid states → type state pattern - Semantic meaning → newtype 2. **When is validation possible?** - At construction → validated newtype - At state transition → type state - Only at runtime → Result with clear error 3. **Who needs to know the invariant?** - Compiler → type-level encoding …
Read the whole file at its exact version.
How to install
mdr add moeru-ai/auv/m05-type-driven@sha256:56895dac5c47ad3fThe line at the top of this page pins the label git:20260725.8a8e541, 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_ubltiqhwubqsfsiu)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Jul 25, 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 (4517 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
moeru-ai/auv · 202 stars · license Apache-2.0 · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ubltiqhwubqsfsiu GET https://markdownregistry.com/api/v1/resolve?ref=moeru-ai/auv/m05-type-driven GET https://markdownregistry.com/api/v1/blob/56895dac5c47ad3fb22e90167eff5a6c501a2b9c088a8b8a6ceb323438c6babd
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.