Antigravity Skill Vault is a collection of reusable Agent Skills for Google Antigravity, covering software development, operations, security, and business work. It is for people who want Antigravity agents to follow specialized expertise, personas, and structured workflows. The catalogue skills are entries 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.
npx skills add rmyndharis/antigravity-skills --skill c-progit clone --depth 1 https://github.com/rmyndharis/antigravity-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/skills/rmyndharis/antigravity-skills/c-pro)<a href="https://agentmods.dev/skills/rmyndharis/antigravity-skills/c-pro"><img src="https://agentmods.dev/badge/skills/rmyndharis/antigravity-skills/c-pro/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/rmyndharis/antigravity-skills/c-pro"><img src="https://agentmods.dev/badge/skills/rmyndharis/antigravity-skills/c-pro.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Memory Poisoning · line 48 Skill manipulates agent memory, state, or stored context. Memory corruption can alter personality, override safety rules, or cause unpredictable behavior.Fix: Protect agent memory and state from modification by untrusted content. Use read-only memory for critical instructions and validate all state changes.
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 | $0.00047 | $0.00342 |
| Opus 5 | $0.00023 | $0.00171 |
| Sonnet 5 | $0.00009 | $0.00068 |
| Haiku 4.5 | $0.00005 | $0.00034 |
Grade A, and why
c-pro 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 10d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- c-pro — 97% identical, 1 lines differ
What it actually says
Use this skill when
- Working on c pro tasks or workflows
- Needing guidance, best practices, or checklists for c pro
Do not use this skill when
- The task is unrelated to c pro
- You need a different domain or tool outside this scope
Instructions
- Clarify goals, constraints, and required inputs.
- Apply relevant best practices and validate outcomes.
- Provide actionable steps and verification.
You are a C programming expert specializing in systems programming and performance.
Focus Areas
- Memory management (malloc/free, memory pools)
- Pointer arithmetic and data structures
- System calls and POSIX compliance
- Embedded systems and resource constraints
- Multi-threading with pthreads
- Debugging with valgrind and gdb
Approach
- No memory leaks - every malloc needs free
- Check all return values, especially malloc
- Use static analysis tools (clang-tidy)
- Minimize stack usage in embedded contexts
- Profile before optimizing
Output
- C code with clear memory ownership
- Makefile with proper flags (-Wall -Wextra)
- Header files with proper include guards
- Unit tests using CUnit or similar
- Valgrind clean output demonstration
- Performance benchmarks if applicable
Follow C99/C11 standards. Include error handling for all system calls.
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.
- 10d ago First seen · 56 lines · 47 tokens per session scan A d4733fabc0f1
c-pro is a skill published in the GitHub repository rmyndharis/antigravity-skills (1,517 stars, last pushed 1mo ago), licensed MIT. It adds 47 tokens to every session and 342 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 2026-08-30.
Other skills, from other repositories
esp32-arduino-embedded-c
Guidance for production-grade ESP32 Arduino and Embedded C/C++ development. Use when building firmware for ESP32, ESP32-S3, or ESP32-C3 microcontrollers, optimizing FreeRTOS tasks, managing SRAM/PSRAM, writing ISR-safe code, or handling dual-core concurrency and hardware peripherals.
unreal-engine-cpp-blueprints
Production guidance for Unreal Engine C++ and Blueprints hybrid architecture, UObject memory management, Unreal Smart Pointers, Gameplay Ability System (GAS), Subsystems, Task Graph multithreading, and performance optimization.
cpp
C++ modern C++17/20/23 with STL, smart pointers, and performance optimization. Use for .cpp files.
cpp-coding-standards
C++ coding standards based on the C++ Core Guidelines (isocpp.github.io). Use when writing, reviewing, or refactoring C++ code to enforce modern, safe, and idiomatic practices.
cpp-testing
Use only when writing/updating/fixing C++ tests, configuring GoogleTest/CTest, diagnosing failing or flaky tests, or adding coverage/sanitizers.
codeigniter-builder
Build clean, efficient CodeIgniter 4 applications. Covers MVC structure, database queries, validation, services, and RESTful API development.