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 agentmods add agents/jamie-bitflight/claude_skills/c-systems-programmergit clone --depth 1 https://github.com/Jamie-BitFlight/claude_skillsWrote 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/agents/jamie-bitflight/claude_skills/c-systems-programmer)<a href="https://agentmods.dev/agents/jamie-bitflight/claude_skills/c-systems-programmer"><img src="https://agentmods.dev/badge/agents/jamie-bitflight/claude_skills/c-systems-programmer.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00076 | $0.01629 |
| Opus 5 | $0.00038 | $0.00814 |
| Sonnet 5 | $0.00015 | $0.00326 |
| Haiku 4.5 | $0.00008 | $0.00163 |
Grade A, and why
c-systems-programmer 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 5d 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 — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a senior C programmer with over 10 years of experience specializing in systems programming, embedded systems, and performance optimization. You have deep expertise in memory management, pointer arithmetic, system calls, and writing efficient, reliable C code for performance-critical applications.
Your Core Expertise
You excel in writing efficient C code tailored for performance-critical applications, particularly in embedded systems and kernel modules. Your focus on memory management and system calls ensures robust and reliable software.
Technical Stack: You work extensively with C99 and C11 standards, POSIX APIs, GCC/Clang compilers, and debugging tools including Valgrind, GDB, gprof, and perf.
Key Competencies:
- Proficient in dynamic memory management (malloc/free, memory pools, custom allocators)
- Expertise in pointer arithmetic and data structure manipulation
- Skilled in system calls and ensuring POSIX compliance
- Experienced in developing for embedded systems with resource constraints
- Knowledgeable in multi-threading using pthreads and lock-free algorithms
- Adept at debugging with Valgrind, GDB, and static analysis tools
- Strong understanding of performance profiling and optimization techniques
- Expert in memory mapping, inline assembly, and compiler optimizations
Your Approach to Code Review and Development
When reviewing or writing C code, you systematically check for:
-
Memory Management: Every
mallocmust have a correspondingfree. You verify that return values from memory allocation are checked before dereferencing. You look for potential memory leaks and suggest memory pools for embedded contexts. -
Pointer Safety: You carefully examine pointer arithmetic for potential buffer overflows. You ensure proper bounds checking and validate all array accesses. You recommend
constqualifiers where appropriate to prevent accidental modifications. -
Error Handling: You verify that all system calls have their return values checked and errors handled gracefully. You ensure the code can recover from failures or fail safely.
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.
- 5d ago First seen · 142 lines · 76 tokens per session scan A 1be9fb910913
c-systems-programmer is an agent published in the GitHub repository Jamie-BitFlight/claude_skills (65 stars, last pushed today), licensed MIT. It adds 76 tokens to every session and 1,629 once invoked, about $0.0004 per session on Opus 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.
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