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-debugnpx skills add google/adk-python --skill adk-debuggit 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 | $0.00191 | $0.00875 |
| Opus 5 | $0.00096 | $0.00438 |
| Sonnet 5 | $0.00038 | $0.00175 |
| Haiku 4.5 | $0.00019 | $0.00088 |
Grade A, and why
adk-debug 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.
How it starts
The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Debugging ADK agents
Two entry points. Default to adk run: one process, no server, and --jsonl
output that pipes straight into grep or python3. Switch to adk web when
you need the browser UI, a persisted session you can click through, or the
trace endpoints that expose the exact LLM request.
First moves
- Reproduce headlessly:
adk run --jsonl {agent_dir} "{query}". Without--jsonl,adk runprints only text parts — tool calls and tool errors are invisible. - Read the log file.
adk runwrites to/tmp/agents_log/agent.latest.logand nothing to the terminal;adk webdoes the opposite. See logs-and-traces.md. - Match the symptom in failure-modes.md before reading source — most reports are one of a handful of known shapes.
- If the text is fine but the routing is not, dump the events and read
author,branch,nodeInfo.path, andactions— event-flow.md. - If the model itself misbehaved, read what it actually received from the
call_llmspan rather than guessing from the agent definition — logs-and-traces.md.
References
- cli-run.md —
adk runflags, the JSONL event shape, multi-turn and human-in-the-loop resume, exit codes, driving aRunnerfrom Python. - web-api.md — starting
adk web, listing and reading sessions over HTTP, posting test messages to/run_sse. - logs-and-traces.md — log levels and where each command writes them, the trace endpoints, span attributes, and the env vars that control whether prompts appear in spans.
- failure-modes.md — ADK-specific symptoms with the cause and a concrete check for each.
- event-flow.md — how an invocation becomes events, callback order, the event fields that matter, and where each stage lives in the source.
What ships with it
5 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 · 67 lines · 191 tokens per session scan A 141e9442ee9f
adk-debug is a skill published in the GitHub repository google/adk-python (21,331 stars, last pushed 2d ago), licensed Apache-2.0. It adds 191 tokens to every session and 875 once invoked, about $0.0010 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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