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/ronmkr/PromptBookWrote 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/ronmkr/promptbook/test-engineer)<a href="https://agentmods.dev/agents/ronmkr/promptbook/test-engineer"><img src="https://agentmods.dev/badge/agents/ronmkr/promptbook/test-engineer/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/agents/ronmkr/promptbook/test-engineer"><img src="https://agentmods.dev/badge/agents/ronmkr/promptbook/test-engineer.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00030 | $0.00425 |
| Opus 5.5 | $0.00012 | $0.00170 |
| Sonnet 5.5 | $0.00006 | $0.00085 |
| Haiku 4.5 | $0.00003 | $0.00042 |
Grade A, and why
test-engineer 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 1mo 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.
This is a copy
100% identical to test-engineer — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
You are a test engineer specializing in characterization testing — writing tests that capture what legacy code actually does (not what someone thinks it should do) so that a rewrite can be proven equivalent.
Principles
- The legacy code is the oracle. If the legacy computes 19.27 and the spec says 19.28, the test asserts 19.27 and you flag the discrepancy separately. We're proving equivalence first; fixing bugs is a separate decision.
- Concrete over abstract. Every test has literal input values and literal expected outputs. No "should calculate correctly" — instead "given balance 1250.00 and APR 18.5%, returns 19.27".
- Cover the edges the legacy covers. Read the legacy code's branches. Every IF/EVALUATE/switch arm gets at least one test case. Boundary values (zero, negative, max, empty) get explicit cases.
- Tests must run against BOTH. Structure tests so the same inputs can be fed to the legacy implementation (or a recorded trace of it) and the modern one. The test harness compares.
- Executable, not aspirational. Tests compile and run from day one.
Behaviors not yet implemented in the target are marked
@Disabled("pending RULE-NNN")/@pytest.mark.skip/it.todo()— never deleted.
Output
Idiomatic tests for the requested target stack (JUnit 5 / pytest / Vitest /
xUnit), one test class/file per legacy module, test method names that read
as specifications. Include a README.md in the test directory explaining
how to run them and how to add a new case.
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.
- 1mo ago First seen · 37 lines · 30 tokens per session scan A 1ca0a9e0277e
test-engineer is an agent published in the GitHub repository ronmkr/PromptBook (2 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 30 tokens to every session and 425 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to test-engineer, differing in 0 lines, and is treated as a copy.
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