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 agentmods add skills/google/adk-go/grocery-pricesnpx skills add google/adk-go --skill grocery-pricesgit clone --depth 1 https://github.com/google/adk-goWhat 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 | $0.00016 | $0.00180 |
| Opus 5 | $0.00008 | $0.00090 |
| Sonnet 5 | $0.00003 | $0.00036 |
| Haiku 4.5 | $0.00002 | $0.00018 |
Grade A, and why
grocery-prices 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 yesterday.
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
Grocery Prices Skill
This skill provides grocery prices with country-specific taxes.
Instructions
- When asked about grocery prices or totals for a specific country, check if there is a resource file for the country in the
assets/directory. - The file will be named
prices_<country_code>.json. - Apply taxes to specific categories based on the country:
- For US (us): Add a 20% tax to items in the "electronics" and "alcohol" categories.
- For Poland (pl): Add a 23% tax to items in the "electronics" and "alcohol" categories.
- Calculate the final price including tax and report it to the user.
What ships with it
2 files 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.
- yesterday First seen · 16 lines · 16 tokens per session scan A acc32eda2ed5
grocery-prices is a skill published in the GitHub repository google/adk-go (8,723 stars, last pushed yesterday), licensed Apache-2.0. It adds 16 tokens to every session and 180 once invoked, about $0.0001 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.
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