c-systems SKILL.md skillA
c-systems from iliaal/ai-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add iliaal/ai-skills/c-systems@git:20261011.09c16dfPins git:20261011.09c16df in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- iliaal/ai-skills
- Path
skills/c-systems/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261011.09c16df, committed Oct 11, 2026
- First version recorded
- Aug 4, 2026
- Size
- 4,563 bytes
- Repository stars
- 45
- License
- MIT
C patterns for systems code, libraries, and native extensions: module layout, function decomposition, status-enum errors, memory safety, undefined behavior, and performance measurement. Use when writing, reviewing, refactoring, or debugging C, working with malloc lifetimes, buffer overflows, sanitizers, or Valgrind, or building native extensions. For C++, see ia-cpp-systems.
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
# C Systems & Native Code Covers C11 and later for libraries, systems code, and native extensions. For C++ (RAII, templates, move semantics), see the `ia-cpp-systems` skill. ## Working rules - Preserve the repository's sanctioned idioms and ABI; do not turn a scoped fix into a restyle. - State ownership, check fallible calls, validate public boundaries, and assert internal invariants. - **Preserve recovery outside optimizer assumptions.** An assertion that becomes an assumption can remove the branch handling its false case. Keep recoverable checks as runtime branches with diagnostic-only assertions behind a debug preprocessor guard. Exercise the fallback in an optimized release build. - **Guard staged initialization against reentry.** Set an in-progress marker before callback-capable work on every constructor or factory path. Permit retry after failure only after fully releasing and resetting partial state. Test recursive entry and retry after failed initialization. - Bound traversal of external input and check sizes before allocation or narrowing. - Choose helpers only when they name a concept, own an error, or isolate a side effect. …
Read the whole file at its exact version.
How to install
mdr add iliaal/ai-skills/c-systems@sha256:4e0b8525ba75b0c2The line at the top of this page pins the label git:20261011.09c16df, 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_nytv4re7pv5njaqq)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Aug 4, 2026 and Oct 11, 2026, about one every 17 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261011.09c16df latest | 2026-10-11 | 09c16df | 4,563 B | A | view · diff |
| git:20260926.7b0520a | 2026-09-26 | 7b0520a | 3,960 B | A | view · diff |
| git:20260908.6c9fed1 | 2026-09-08 | 6c9fed1 | 3,964 B | A | view · diff |
| git:20260829.3d61391 | 2026-08-29 | 3d61391 | 21,568 B | A | view · diff |
| git:20260804.7dab1cb | 2026-08-04 | 7dab1cb | 14,958 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 (4563 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
iliaal/ai-skills · 45 stars · license MIT · pushed 2026-10-31 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_nytv4re7pv5njaqq GET https://markdownregistry.com/api/v1/resolve?ref=iliaal/ai-skills/c-systems GET https://markdownregistry.com/api/v1/blob/4e0b8525ba75b0c2d8e7182081550818fa30b37d8c5d2607211e75b98ce45a7a
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.