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/googlecloudplatform/professional-services/eval-breakdownnpx skills add GoogleCloudPlatform/professional-services --skill eval-breakdowngit clone --depth 1 https://github.com/GoogleCloudPlatform/professional-servicesWhat 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 | $0.00100 | $0.00727 |
| Opus 5 | $0.00050 | $0.00364 |
| Sonnet 5 | $0.00020 | $0.00145 |
| Haiku 4.5 | $0.00010 | $0.00073 |
Grade A, and why
eval-breakdown 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 — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Eval Breakdown: Question-by-Question Diagnostic Analysis
This skill guides an agent through conducting a rigorous, evidence-grounded, question-by-question narrative diagnostic audit of an agent-eval benchmark run.
1. Input Sources & Directory Anatomy
An agent-eval results folder (tests/eval/results/{run_id}/ or gs://<bucket>/runs/{run_id}/) contains three primary diagnostic artifacts:
eval_summary.json: Aggregated metrics, per-question score distributions, and AutoRater judge verdicts.question_answer_log.md: Multi-turn conversational transcripts including user prompts, agent responses, tool calls, and tool outputs.gemini_analysis.md: Automated executive diagnosis and loss cluster summary.
2. Step-by-Step Diagnostic Workflow
Step 1: Generate the Baseline Matrix Table
Extract individual question scores and judge reasoning using the bundled script:
python3 tools/agent-eval/skills/agent-eval/scripts/parse_eval_summary.py \
--summary-path tests/eval/results/{run_id}/eval_summary.json
Step 2: Perform the Dialogue Audit Protocol
Inspect question_answer_log.md for each scenario, analyzing across:
- Turn-by-Turn User Intent: What the user requested in Turn 1, Turn 2, etc.
- Tool Execution & Traceability: Did the agent emit SQL/API tool calls on each turn where factual assertions were made, or did it answer from empirical dialogue memory?
- The Memory Reuse vs. Traceability Rubric Clash:
- Diagnostic Pattern: If
tool_use_qualitydrops to0.00on Turn 2 follow-ups, verify if the agent answered correctly from dialogue memory without re-querying the backend. If the rubric expects a tool call on every turn, calibrate the rubric or prompt instructions accordingly.
- Diagnostic Pattern: If
- Judge Explanation Grounding: Cross-reference any rubric score $< 1.00$ against the exact model response to verify whether the deduction was a genuine agent failure (Tier 1) or an overly strict judge rubric (Tier 2).
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 · 57 lines · 100 tokens per session scan A 6b7cafb1d9a8
eval-breakdown is a skill published in the GitHub repository GoogleCloudPlatform/professional-services (3,065 stars, last pushed 10d ago), licensed Apache-2.0. It adds 100 tokens to every session and 727 once invoked, about $0.0005 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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