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.
npx skills add jnPiyush/AgentX --skill cgit clone --depth 1 https://github.com/jnPiyush/AgentXWrote 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.
[](https://agentmods.dev/skills/jnpiyush/agentx/c)<a href="https://agentmods.dev/skills/jnpiyush/agentx/c"><img src="https://agentmods.dev/badge/skills/jnpiyush/agentx/c/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.
<a href="https://agentmods.dev/skills/jnpiyush/agentx/c"><img src="https://agentmods.dev/badge/skills/jnpiyush/agentx/c.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00051 | $0.01741 |
| Opus 5.5 | $0.00020 | $0.00696 |
| Sonnet 5.5 | $0.00010 | $0.00348 |
| Haiku 4.5 | $0.00005 | $0.00174 |
Grade A, and why
c 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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?
| +-- Small library/app? -> CMake
| +-- Toolchain-heavy or embedded? -> CMake or Meson with toolchain files
-- Need concurrency? -> C11/C23 atomics and threads only when platform support is explicit
Prerequisites
- C23-capable compiler such as GCC 15.2+ or Clang 22.1+
- Build system such as CMake 3.30+ or Meson
- AddressSanitizer and UndefinedBehaviorSanitizer available in CI/dev builds
Table of Contents
- Project Structure
- Language Standard
- Memory and Ownership
- Error Handling
- Interfaces and ABI Safety
- Concurrency
- Testing and Tooling
- Security
- Checklist
Project Structure
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.
- 1mo ago Changed c41e3d6de2b2
- 1mo ago First seen · 222 lines · 51 tokens per session scan A a553986d6861
c is a skill published in the GitHub repository jnPiyush/AgentX (16 stars, last pushed 3d ago), licensed Apache-2.0. It adds 51 tokens to every session and 1,741 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.
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