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 glassity/agent-skills --skill cost-ec2-usagegit clone --depth 1 https://github.com/glassity/agent-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/glassity/agent-skills/cost-ec2-usage)<a href="https://agentmods.dev/skills/glassity/agent-skills/cost-ec2-usage"><img src="https://agentmods.dev/badge/skills/glassity/agent-skills/cost-ec2-usage/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/glassity/agent-skills/cost-ec2-usage"><img src="https://agentmods.dev/badge/skills/glassity/agent-skills/cost-ec2-usage.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 | $0.00057 | $0.00375 |
| Opus 5 | $0.00028 | $0.00187 |
| Sonnet 5 | $0.00011 | $0.00075 |
| Haiku 4.5 | $0.00006 | $0.00038 |
Grade A, and why
cost-ec2-usage 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 9d 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
EC2 usage
When to use
- "Show my EC2 usage", "what instance types are we running"
- "Hours by instance type"
Binary check
Run command -v glassity before the first CLI call. If it is missing, stop and
tell the user to install it with brew install glassity/tap/glassity or from
https://github.com/glassity/cli/releases. No account yet? Sign up at
app.glassity.cloud.
Invocation
glassity --output=json cost ec2-usage \
--start-date YYYY-MM-DD \
--end-date YYYY-MM-DD \
[--aws-account-id 123456789012] \
[--granularity daily|monthly]
--end-date is exclusive — the window ends the day before it. For a
full month, pass the first of the next month (a July window is --start-date YYYY-07-01 --end-date YYYY-08-01); an end date of the 31st silently drops
that day.
Surface
- The active tenant, which the CLI prints on stderr
- Oversized or idle instance families, when the data suggests them
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.
- 9d ago First seen · 40 lines · 57 tokens per session scan A 99d108ce8945
cost-ec2-usage is a skill published in the GitHub repository glassity/agent-skills (2 stars, last pushed 26d ago), licensed Apache-2.0. It adds 57 tokens to every session and 375 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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