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c-interop

c-interop is a skill for Claude Code from vinnie357/claude-skills. It costs 40 tokens per session (245 once invoked), scanned A, original, MIT.

A guide to connecting Zig programs with C code and libraries. It explains importing C headers, exporting Zig functions, matching C and Zig types, translating C code, and linking libraries.

In plain words
What is it for?
Use it to work with @cImport, translate-c, C-compatible types, exported functions, and linked C libraries.
Why use it?
It helps when a Zig project must use existing C code or expose functions to software written in C.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the zig plugin — 3 skills shipped together

not rated 27repo 14d ago A scan SkillSpector: pass 40 tokens original MIT

Good fit Use it to work with @cImport, translate-c, C-compatible types, exported functions, and linked C libraries.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/vinnie357/claude-skills/c-interop
View source ↗ vinnie357/claude-skills
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add vinnie357/claude-skills --skill c-interop
Clone the repo
git clone --depth 1 https://github.com/vinnie357/claude-skills

Made for: Claude Code.

Or install zig, the plugin that ships this one along with the rest of its 3 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for c-interop

README.md
[![agentmods](https://agentmods.dev/badge/skills/vinnie357/claude-skills/c-interop/github.svg)](https://agentmods.dev/skills/vinnie357/claude-skills/c-interop)
Your own site
<a href="https://agentmods.dev/skills/vinnie357/claude-skills/c-interop"><img src="https://agentmods.dev/badge/skills/vinnie357/claude-skills/c-interop/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for c-interop

Your own site · 80×15
<a href="https://agentmods.dev/skills/vinnie357/claude-skills/c-interop"><img src="https://agentmods.dev/badge/skills/vinnie357/claude-skills/c-interop.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 245 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00040 $0.00245
Opus 5.5 $0.00016 $0.00098
Sonnet 5.5 $0.00008 $0.00049
Haiku 4.5 $0.00004 $0.00024

Measured 2mo ago against content hash c5d80824d869, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

c-interop scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/languages/zig/skills/c-interop/SKILL.md · 22 lines

What it actually says

Zig C Interop

Importing C libraries, exporting Zig to C, type mappings, and translate-c.

For type mappings, linking patterns, and string interop examples, see references/c-interop.md.

Anti-fabrication

This skill follows core:anti-fabrication. Verified against zig 0.16.0 (locally installed, claude-skills-204): references/c-interop.md's type mappings and linking snippets compile as documented — no corrections needed here. A related claim, that @cImport emits a deprecation warning, was found wrong and corrected, but that claim lived in the troubleshooting skill's compiler-error catalog, not in this file. Re-verify against a locally installed zig build-exe with a real C header before asserting a type mapping this skill doesn't cover — Zig is pre-1.0 and translate-c behavior has changed across minor releases.

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 22 lines · 40 tokens per session scan A c5d80824d869

Subscribe to this mod's changes

c-interop is a skill published in the GitHub repository vinnie357/claude-skills (27 stars, last pushed 14d ago), licensed MIT. It adds 40 tokens to every session and 245 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

C and C++Languages
Related

c-interop compared with skills from other repositories

c-interop next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
c-interopvinnie357/claude-skillsSkill2714d agoMITA40Claude Code
zoom-meeting-sdk-unrealanthropics/knowledge-work-pluginsSkill35k3d agoApache-2.0A41Claude Code
doca-argpNVIDIA/skillsSkill3.9ktodayApache-2.0A277Claude Code, Codex
cpu-kernelshuggingface/kernelsSkill783todayApache-2.0A89Claude Code
cpp-prormyndharis/antigravity-skillsSkill2.0k2d agoMITA49Claude Code, Codex
llvm-learninggmh5225/awesome-llvm-securitySkill8911mo agoMITA39Claude Code
llvm-securitygmh5225/awesome-llvm-securitySkill8911mo agoMITA43Claude Code