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moonbit-c-binding

moonbit-c-binding is a skill for Claude Code, Codex from moonbitlang/moonbit-agent-guide. It costs 49 tokens per session (3,204 once invoked), scanned A, original, no licence file.

A guide for connecting MoonBit code to C libraries through native FFI, a mechanism for calling functions written in another language. It covers C declarations, C stubs, package configuration, and native linking.

In plain words
What is it for?
Use it when adding extern C declarations, writing C stubs with moonbit.h, or configuring native stubs and native linking in moon.pkg.
Why use it?
It helps provide the declarations, glue code, and build settings needed for MoonBit to use C library functionality.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

not rated 76repo 9d ago A scan 49 tokens no licence

Good fit Use it when adding extern C declarations, writing C stubs with moonbit.h, or configuring native stubs and native linking in moon.pkg.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/moonbitlang/moonbit-agent-guide/moonbit-c-binding
View source ↗ moonbitlang/moonbit-agent-guide moonbitlang.com
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 moonbitlang/moonbit-agent-guide --skill moonbit-c-binding
Clone the repo
git clone --depth 1 https://github.com/moonbitlang/moonbit-agent-guide

Made for: Claude Code, Codex.

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 moonbit-c-binding

README.md
[![agentmods](https://agentmods.dev/badge/skills/moonbitlang/moonbit-agent-guide/moonbit-c-binding/github.svg)](https://agentmods.dev/skills/moonbitlang/moonbit-agent-guide/moonbit-c-binding)
Your own site
<a href="https://agentmods.dev/skills/moonbitlang/moonbit-agent-guide/moonbit-c-binding"><img src="https://agentmods.dev/badge/skills/moonbitlang/moonbit-agent-guide/moonbit-c-binding/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 moonbit-c-binding

Your own site · 80×15
<a href="https://agentmods.dev/skills/moonbitlang/moonbit-agent-guide/moonbit-c-binding"><img src="https://agentmods.dev/badge/skills/moonbitlang/moonbit-agent-guide/moonbit-c-binding.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,204 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.
Origin unknown 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 $0.00049 $0.03204
Opus 5.5 $0.00020 $0.01282
Sonnet 5.5 $0.00010 $0.00641
Haiku 4.5 $0.00005 $0.00320

Measured 2mo ago against content hash d71c8098d32e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

moonbit-c-binding 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.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/run-asan.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

moonbit-c-binding/SKILL.md · 329 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

6 files 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 · 329 lines · 49 tokens per session scan A d71c8098d32e

Subscribe to this mod's changes

moonbit-c-binding is a skill published in the GitHub repository moonbitlang/moonbit-agent-guide (76 stars, last pushed 9d ago), with no licence file. It adds 49 tokens to every session and 3,204 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 2026-08-30.

C and C++Languages
Related

moonbit-c-binding compared with skills from other repositories

moonbit-c-binding next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
moonbit-c-bindingmoonbitlang/moonbit-agent-guideSkill769d agononeA49Claude Code, Codex
zoom-meeting-sdk-unrealanthropics/knowledge-work-pluginsSkill35ktodayApache-2.0A41Claude Code
doca-argpNVIDIA/skillsSkill3.9ktodayApache-2.0A277Claude Code, Codex
cpu-kernelshuggingface/kernelsSkill783yesterdayApache-2.0A89Claude Code
llvm-learninggmh5225/awesome-llvm-securitySkill8911mo agoMITA39Claude Code
llvm-securitygmh5225/awesome-llvm-securitySkill8911mo agoMITA43Claude Code
cpp-prormyndharis/antigravity-skillsSkill2.0k24d agoMITA53Claude Code, Codex