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/vepo/contrapontoWrote 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/rules/vepo/contraponto/contraponto-test-failure-diagnosis)<a href="https://agentmods.dev/rules/vepo/contraponto/contraponto-test-failure-diagnosis"><img src="https://agentmods.dev/badge/rules/vepo/contraponto/contraponto-test-failure-diagnosis/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/rules/vepo/contraponto/contraponto-test-failure-diagnosis"><img src="https://agentmods.dev/badge/rules/vepo/contraponto/contraponto-test-failure-diagnosis.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 | $0.00000 | $0.00424 |
| Opus 5 | $0.00000 | $0.00212 |
| Sonnet 5 | $0.00000 | $0.00085 |
| Haiku 4.5 | $0.00000 | $0.00042 |
Grade A, and why
contraponto-test-failure-diagnosis 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 10d 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.
The source is not reproduced here
Licensed GPL-2.0
The repository is licensed GPL-2.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- 10d ago First seen · 50 lines · 0 tokens per session scan A 785e9370bb47
contraponto-test-failure-diagnosis is a cursor rule published in the GitHub repository vepo/contraponto (3 stars, last pushed 1mo ago), licensed GPL-2.0. It costs nothing until one of its globs matches a file; then it loads 424 tokens. 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 2026-08-31.
Other cursor rules, from other repositories
playwright-e2e
Playwright E2E testing configuration for AI agents.
e2e-testing
E2E Flow Tests setup and debugging guide.
debug-issue
When the user reports a bug, an error, or unexpected behavior. Enforces four structured phases — reproduction, failing test, root cause isolation, fix and verify — to stop guess-and-check loops.
系统化调试
A step-by-step method for investigating bugs, failed tests, and unexpected behaviour. It provides a structured way to narrow down the cause instead of guessing.
debugging-and-testing-rules
description: Specifies practices for debugging and testing, including logging, unit tests, and ensuring all tests pass. globs: /.
debugging-and-testing-rules
Specifies practices for debugging and testing, including logging, unit tests, and ensuring all tests pass.