m05-type-driven skillA
m05-type-driven is agent-read markdown (skill) from moeru-ai/auv: 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.
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns 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@git:20260725.8a8e541mdr add moeru-ai/auv/m05-type-driven@sha256:56895dac5c47ad3fPin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_ubltiqhwubqsfsiu)
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Versions
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 · 50 stars · license Apache-2.0 · pushed 2026-09-23 · 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
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