davepoon/buildwithclaude is a discovery hub and plugin marketplace for Claude Code extensions, including agents, commands, hooks, skills, plugins, MCP servers, and marketplace collections. Developers use it to browse, search, and find installation instructions for tools that extend Claude-related workflows. Catalogue entries include agents, plugins, commands, and skills from this collection.
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.
git 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/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/agents/davepoon/buildwithclaude/c-developer"><img src="https://agentmods.dev/badge/agents/davepoon/buildwithclaude/c-developer.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00031 | $0.00205 |
| Opus 5.5 | $0.00012 | $0.00082 |
| Sonnet 5.5 | $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 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.
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.
- 1mo ago First seen · 34 lines · 31 tokens per session scan A 60011b25a667
c-developer is an agent published in the GitHub repository davepoon/buildwithclaude (3,650 stars, last pushed today), licensed MIT. It adds 31 tokens to every session and 205 once invoked, about $0.0001 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.
Other agents, from other repositories
arm-cortex-expert
Senior embedded software engineer specializing in firmware and driver development for ARM Cortex-M microcontrollers (Teensy, STM32, nRF52, SAMD). Decades of experience writing reliable, optimized, and maintainable embedded code with deep expertise in memory barriers, DMA/cache coherency, interrupt-driven I/O, and…
embedded-developer
Embedded systems, firmware, RTOS, microcontrollers (STM32, ESP32, Arduino), IoT, and bare-metal C/C++ specialist. Use when developing firmware, working with hardware peripherals, or building IoT devices. Trigger phrases: embedded, firmware, RTOS, microcontroller, Arduino, ESP32, STM32, IoT, bare-metal, I2C, SPI, UART…
c-systems-programmer
C programming specialist for systems programming, embedded systems, memory management, and performance optimization. Use when writing/reviewing C code, debugging memory leaks, investigating segfaults, working with POSIX APIs, implementing pthreads, optimizing embedded systems, using GDB/Valgrind debuggers, developing…
cpp-pro
Write idiomatic C++ code with modern features, RAII, smart pointers, and STL algorithms. Handles templates, move semantics, and performance optimization. Use PROACTIVELY for C++ refactoring, memory safety, or complex C++ patterns.
c-pro
Write efficient C code with proper memory management, pointer arithmetic, and system calls. Handles embedded systems, kernel modules, and performance-critical code. Use PROACTIVELY for C optimization, memory issues, or system programming.
firmware-engineer
Use when implementing embedded firmware, writing bare-metal C/C++/Rust for microcontrollers, developing RTOS-based systems, building HAL abstraction layers, implementing communication protocols (BLE, UART, SPI, I2C, USB), or debugging hardware/software interfaces. Firmware Engineer works from hardware bring-up and…