c skillA
c is agent-read markdown (skill) from jnpiyush/agentx: Write safe, portable, and efficient C code using modern C23-era practices. Use when building systems software, embedded components, native libraries, POSIX tooling, or FFI boundaries where precise control over memory, layout, and runtime cost matters..
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
# C Development > WHEN: Writing or reviewing C code, native libraries, embedded components, POSIX tools, or C interfaces where memory layout, portability, and deterministic runtime behavior matter. ## When to Use This Skill - Building native C libraries and command-line tools - Implementing embedded or systems-level components - Designing FFI-safe interfaces for other languages - Hardening pointer-heavy or buffer-heavy code - Modernizing legacy C to safer, clearer patterns ## Decision Tree ``` C Project Decision +-- Hosted application? | +-- Portable CLI? -> ISO C23 + small platform abstraction layer | +-- POSIX-only tooling? -> C23 + POSIX APIs with portability notes +-- Embedded / firmware? | +-- No allocator allowed? -> static storage + arena/fixed buffers | +-- ISR / hard real-time? -> avoid blocking, heap, and hidden copies +-- Public API? | +-- Cross-language FFI? -> opaque handles + explicit ownership rules | +-- Internal only? -> expose structs only when layout coupling is acceptable +-- Error handling? | +-- Recoverable runtime errors? -> status codes + out parameters | +-- Fatal init/config errors? -> fail fast at process boundary +-- Build system? …
Read the whole file at its exact version.
How to install
mdr add jnpiyush/agentx/c@v1.0.0mdr add jnpiyush/agentx/c@sha256:c41e3d6de2b21110Pin 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_du2huz6qjq4cpucn)
1 badge views in 30 days
Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.0 latest | 2026-09-15 | f17c505 | 7,695 B | A | view · diff |
| v1.0.0 | 2026-04-04 | 1693004 | 7,693 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 (7695 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
jnpiyush/agentx · 16 stars · license Apache-2.0 · pushed 2026-09-21 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_du2huz6qjq4cpucn GET https://markdownregistry.com/api/v1/resolve?ref=jnpiyush/agentx/c GET https://markdownregistry.com/api/v1/blob/c41e3d6de2b2111071050771410dae6792ab5c91de4a15e13de620f903e82af2
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