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 airvalona/antigravity-like-claude-code --skill usage-reportgit clone --depth 1 https://github.com/airvalona/antigravity-like-claude-codeWrote 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/airvalona/antigravity-like-claude-code/usage-report)<a href="https://agentmods.dev/skills/airvalona/antigravity-like-claude-code/usage-report"><img src="https://agentmods.dev/badge/skills/airvalona/antigravity-like-claude-code/usage-report/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/airvalona/antigravity-like-claude-code/usage-report"><img src="https://agentmods.dev/badge/skills/airvalona/antigravity-like-claude-code/usage-report.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 | $0.00070 | $0.00387 |
| Opus 5 | $0.00035 | $0.00193 |
| Sonnet 5 | $0.00014 | $0.00077 |
| Haiku 4.5 | $0.00007 | $0.00039 |
Grade A, and why
usage-report 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.
What it actually says
/usage-report — Session Activity Summary
Port of Claude Code's /usage (/cost). Important limitation: Antigravity CLI's
billing model and token accounting are not exposed to skills the way Claude Code's
harness exposes /cost — this skill cannot report exact token counts or dollar
amounts. It gives a best-effort activity summary instead, and points to the real
source of truth.
Arguments
/usage-report— summarize the current session's activity
Steps
-
Count and list from the current session:
- Number of assistant turns / responses so far
- Files read, created, or edited (deduplicated list)
- Tool/command invocations made (bash commands run, searches performed, etc.)
-
Present as a short table or bullet list, e.g.:
## Session activity
Turns: 14
Files touched: 6 (list)
Commands run: 9
- Do not fabricate token counts or cost figures. If the user needs exact
usage/billing numbers, tell them plainly that this skill can't see that data
and point them to
agyconfig/account settings or Google Cloud billing console, whichever applies to their setup — don't guess which.
Notes
This is the one Claude Code command this package can only partially replicate, since real usage accounting lives in the harness, not in prompt-level skills. Flag that limitation to the user rather than presenting an estimate as authoritative.
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 · 41 lines · 70 tokens per session scan A fe7a8c529970
usage-report is a skill published in the GitHub repository airvalona/antigravity-like-claude-code (2 stars, last pushed 2mo ago), licensed MIT. It adds 70 tokens to every session and 387 once invoked, about $0.0003 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 2026-08-31.
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