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memory-audit

Testing & Quality
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Audit embedded code for stack overflow risks, heap fragmentation, static allocation patterns, and memory leaks. Use when investigating OOM crashes, optimizing memory usage, or reviewing memory-critical code on constrained devices.

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How to use this skill

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  2. Copy the prompt below and paste it into your agent.
  3. Review the proposed files and risks before you approve installation.
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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/FastLED/FastLED/blob/HEAD/.claude/skills/memory-audit/SKILL.md

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First, summarize what it does, its dependencies, license status if identifiable, and any risks. Show the exact files you propose to add under .agents/skills/memory-audit/. Do not write files or run scripts until I approve.

After I approve, install the complete skill folder, including required referenced files, into that project location. Verify it is discoverable, then tell me its actual invocation name and how to use it. Do not claim it is installed until you have verified it.

Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

Audit code for memory safety issues specific to resource-constrained embedded systems.

$ARGUMENTS

What This Skill Analyzes

Stack Usage

  • Functions with large local arrays or structs (risk of stack overflow)
  • Deep call chains and recursion (stack depth estimation)
  • Task/thread stack size adequacy (FreeRTOS xTaskCreate stack parameter)
  • Alloca/VLA usage (variable-length arrays on stack)

Heap Fragmentation

  • Frequent small allocations and deallocations in hot paths
  • Mixed allocation sizes causing fragmentation over time
  • Missing deallocation (memory leaks)
  • Allocation in ISRs or time-critical code (heap locks can cause priority inversion)

Static Allocation Patterns

  • Global/static buffer sizing (too large wastes RAM, too small causes overflow)
  • Compile-time vs runtime allocation trade-offs
  • .bss and .data section usage
  • PSRAM vs internal SRAM placement decisions

Platform-Specific Concerns

  • ESP32: DRAM/IRAM split, PSRAM cache line alignment, DMA-capable memory
  • ARM Cortex-M: Stack/heap collision, MPU configuration, scatter file layout
  • AVR: 2KB SRAM constraint, PROGMEM usage for constants

How To Use

/memory-audit src/platforms/esp/32/drivers/
/memory-audit src/fl/channels/
/memory-audit Check if LED buffer allocation is safe for 1000+ LEDs on ESP32

What You'll Get

  • Memory usage breakdown by category (stack, heap, static)
  • Risk assessment for each finding (Critical/High/Medium/Low)
  • Specific recommendations with code examples
  • Platform-aware advice (e.g., "move to PSRAM" vs "reduce buffer size")