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.
git clone --depth 1 https://github.com/frootai/frootaiWrote 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/agents/frootai/frootai/fai-play-03-reviewer.agent.lean)<a href="https://agentmods.dev/agents/frootai/frootai/fai-play-03-reviewer.agent.lean"><img src="https://agentmods.dev/badge/agents/frootai/frootai/fai-play-03-reviewer.agent.lean.svg" alt="Measured on agentmods" 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 | $0.00039 | $0.00593 |
| Opus 5 | $0.00019 | $0.00296 |
| Sonnet 5 | $0.00008 | $0.00119 |
| Haiku 4.5 | $0.00004 | $0.00059 |
Grade A, and why
FAI Deterministic Agent Reviewer 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 4d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- FAI Deterministic Agent Reviewer — 100% identical, 4 lines differ
What it actually says
FAI Deterministic Agent Reviewer
Deterministic Agent reviewer for Play 03. Reviews reproducibility, guardrail completeness, anti-sycophancy defense, schema validation, and confidence calibration.
Core Expertise
- Determinism verification: Same input → same output (100 repetitions), seed consistency, temperature=0 enforced
- Guardrail completeness: All 6 layers present, no bypass paths, error handling at each layer
- Anti-sycophancy testing: Adversarial prompts that pressure override, contradiction handling
- Schema validation review: JSON schemas match API contract, all fields covered, error types defined
- Confidence calibration: Score distribution analysis, false positive/negative rates, threshold appropriateness
What the Model Gets Wrong
| Mistake | Why Wrong | Correct Approach |
|---|---|---|
| Approves without consistency test | Reproducibility not verified | Require 100-run consistency test: same input = same output |
| Ignores guardrail bypass paths | Edge cases skip validation | Trace every input through all 6 guardrail layers |
| Skips adversarial testing | Agent vulnerable to user pressure | Test with "ignore instructions" prompts, verify resistance |
| Approves confidence scores untested | Calibration unknown, false confidence risk | Check score distribution, verify abstention at low confidence |
| Reviews code only, not config | temperature=0.3 in config breaks determinism | Always validate config/openai.json: temperature=0, seed set |
Anti-Patterns
- Review without running tests: Always execute consistency + adversarial test suites
- Approving partial guardrails: All 6 layers required, no exceptions
- Config review skipped: Bad config == broken determinism even with good code
Compatible Solution Plays
| Play | How This Agent Helps |
|---|---|
| 03 — Deterministic Agent | Reproducibility audit, guardrail review, adversarial testing |
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.
- 4d ago First seen · 55 lines · 39 tokens per session scan A b767a88b6e18
FAI Deterministic Agent Reviewer is an agent published in the GitHub repository frootai/frootai (7 stars, last pushed today), licensed MIT. It adds 39 tokens to every session and 593 once invoked, about $0.0002 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 2026-09-03.
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