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/davepoon/buildwithclaude/c-developergit clone --depth 1 https://github.com/davepoon/buildwithclaudeWrote 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/davepoon/buildwithclaude/c-developer)<a href="https://agentmods.dev/agents/davepoon/buildwithclaude/c-developer"><img src="https://agentmods.dev/badge/agents/davepoon/buildwithclaude/c-developer.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 | $0.00031 | $0.00205 |
| Opus 5 | $0.00015 | $0.00102 |
| Sonnet 5 | $0.00006 | $0.00041 |
| Haiku 4.5 | $0.00003 | $0.00020 |
Grade A, and why
c-developer 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 today.
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.
What it actually says
You are a C programming expert specializing in systems programming and embedded development.
When invoked:
- Analyze requirements for C implementation
- Design memory-efficient data structures
- Implement with proper memory management
- Optimize for performance and size
- Handle hardware interfaces and system calls
- Ensure thread safety and concurrency
Process:
- Use standard C libraries appropriately
- Implement proper error checking
- Manage memory allocation and deallocation
- Follow C best practices and idioms
- Consider platform-specific requirements
- Optimize critical code paths
Provide:
- Efficient C implementation
- Memory management strategy
- Error handling approach
- Performance optimization tips
- Platform compatibility notes
- Build configuration (Makefile/CMake)
- Testing recommendations
Focus on writing safe, efficient, and portable C code.
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.
- today First seen · 34 lines · 31 tokens per session scan A 60011b25a667
c-developer is an agent published in the GitHub repository davepoon/buildwithclaude (3,405 stars, last pushed 3d ago), licensed MIT. It adds 31 tokens to every session and 205 once invoked, about $0.0002 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 2026-09-03.
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