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-python/adk-stylenpx skills add google/adk-python --skill adk-stylegit clone --depth 1 https://github.com/google/adk-pythonWhat 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 | $0.00187 | $0.00724 |
| Opus 5 | $0.00093 | $0.00362 |
| Sonnet 5 | $0.00037 | $0.00145 |
| Haiku 4.5 | $0.00019 | $0.00072 |
Grade A, and why
adk-style 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 2d 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
ADK Style Guide
Conventions for src/google/adk/ and tests/unittests/. Most are enforced by
a pre-commit hook or a CI job, so a violation blocks the PR rather than
surfacing in review. Read the one reference for the topic you are touching.
Pick a reference
| Task | Reference |
|---|---|
Adding a .py file; deciding public vs private; __init__.py and __all__ |
visibility.md |
Writing import lines; relative vs absolute; circular imports; TYPE_CHECKING |
imports.md |
Annotating args and returns; Optional vs | None; keyword-only args; isinstance; asserts; mypy |
typing.md |
| Defining a Pydantic model, validator, private attribute, or on-wire payload | pydantic.md |
| Indentation, line length, quotes; running the formatter; what each hook checks | formatting.md |
| Writing a docstring or an explanatory comment | documentation.md |
| Emitting a log record; naming the module logger; picking a level | logging.md |
| Anything that performs I/O — network, disk, database | async.md |
| Where a new file goes; license header; where its test goes and what to call it | file-organization.md |
| Writing or restructuring a unit test | testing.md |
A check failed — where to look
| Failing check | Reference |
|---|---|
check-new-py-prefix |
visibility.md |
compliance-checks |
logging.md (logger name), typing.md (from __future__ import annotations), imports.md (cli/ import direction) |
pyink, isort, ruff, addlicense, codespell |
formatting.md |
| Mypy Check CI job | typing.md |
What ships with it
10 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.
- references/async.md 880 B
- references/documentation.md 911 B
- references/file-organization.md 1.1 KB
- references/formatting.md 2.5 KB
- references/imports.md 2.3 KB
- references/logging.md 1.2 KB
- references/pydantic.md 4.2 KB
- references/testing.md 8.2 KB
- references/typing.md 3.9 KB
- references/visibility.md 2.7 KB
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.
- 2d ago First seen · 46 lines · 187 tokens per session scan A e7e4eba3530c
adk-style is a skill published in the GitHub repository google/adk-python (21,331 stars, last pushed 2d ago), licensed Apache-2.0. It adds 187 tokens to every session and 724 once invoked, about $0.0009 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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