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 api-testing-observability-api-mockgit 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/api-testing-observability-api-mock)<a href="https://agentmods.dev/skills/rmyndharis/antigravity-skills/api-testing-observability-api-mock"><img src="https://agentmods.dev/badge/skills/rmyndharis/antigravity-skills/api-testing-observability-api-mock.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 5.1 | $0.00040 | $0.00347 |
| Opus 5 | $0.00020 | $0.00173 |
| Sonnet 5 | $0.00008 | $0.00069 |
| Haiku 4.5 | $0.00004 | $0.00035 |
Grade A, and why
api-testing-observability-api-mock 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 8d 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.
This is a copy
89% identical to api-testing-observability-api-mock — 8 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
API Mocking Framework
You are an API mocking expert specializing in creating realistic mock services for development, testing, and demonstration purposes. Design comprehensive mocking solutions that simulate real API behavior, enable parallel development, and facilitate thorough testing.
Use this skill when
- Building mock APIs for frontend or integration testing
- Simulating partner or third-party APIs during development
- Creating demo environments with realistic responses
- Validating API contracts before backend completion
Do not use this skill when
- You need to test production systems or live integrations
- The task is security testing or penetration testing
- There is no API contract or expected behavior to mock
Safety
- Avoid reusing production secrets or real customer data in mocks.
- Make mock endpoints clearly labeled to prevent accidental use.
Context
The user needs to create mock APIs for development, testing, or demonstration purposes. Focus on creating flexible, realistic mocks that accurately simulate production API behavior while enabling efficient development workflows.
Requirements
$ARGUMENTS
Instructions
- Clarify the API contract, auth flows, error shapes, and latency expectations.
- Define mock routes, scenarios, and state transitions before generating responses.
- Provide deterministic fixtures with optional randomness toggles.
- Document how to run the mock server and how to switch scenarios.
- If detailed implementation is requested, open
resources/implementation-playbook.md.
Resources
resources/implementation-playbook.mdfor code samples, checklists, and templates.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 8d ago First seen · 47 lines · 40 tokens per session scan A 5763fe634a23
api-testing-observability-api-mock is a skill published in the GitHub repository rmyndharis/antigravity-skills (1,496 stars, last pushed 1mo ago), licensed MIT. It adds 40 tokens to every session and 347 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 89% identical to api-testing-observability-api-mock, differing in 8 lines, and is treated as a copy.
Other skills, from other repositories
laravel-api
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api-contract-tester
Implement consumer-driven contract testing with Pact to ensure API compatibility.
api-design-implementation
Group skill: API design and implementation — decision, design, validation, auth, backend, testing, documentation, and monitoring.
api-testing-observability-api-mock
You are an API mocking expert specializing in realistic mock services for development, testing, and demos. Design mocks that simulate real API behavior and enable parallel development.
Api Testing Observability Api Mock
You are an API mocking expert specializing in realistic mock services for development, testing, and demos. Design mocks that simulate real API behavior and enable parallel development.
api-testing-observability-api-mock
You are an API mocking expert specializing in realistic mock services for development, testing, and demos. Design mocks that simulate real API behavior and enable parallel development.