Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add Roxabi/roxabi-plugins/plugin install dev-coreWrote 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/roxabi/roxabi-plugins/r-tester)<a href="https://agentmods.dev/agents/roxabi/roxabi-plugins/r-tester"><img src="https://agentmods.dev/badge/agents/roxabi/roxabi-plugins/r-tester/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/roxabi/roxabi-plugins/r-tester"><img src="https://agentmods.dev/badge/agents/roxabi/roxabi-plugins/r-tester.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 | $0.00077 | $0.01940 |
| Opus 5.5 | $0.00031 | $0.00776 |
| Sonnet 5.5 | $0.00015 | $0.00388 |
| Haiku 4.5 | $0.00008 | $0.00194 |
Grade A, and why
R-tester 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.
The source is not reproduced here
Licensed AGPL-3.0
The repository is licensed AGPL-3.0, 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.
- 1mo ago Changed · +18 lines aaa409cf63d6
- 1mo ago Changed · +1 lines 4fab36ee0228
- 1mo ago First seen · 139 lines · 77 tokens per session scan A 3afee98b884a
R-tester is an agent published in the GitHub repository Roxabi/roxabi-plugins (9 stars, last pushed today), licensed AGPL-3.0. It adds 77 tokens to every session and 1,940 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-09-06.
Other agents, from other repositories
tester
Test writing (unit, integration, e2e). Creates comprehensive test suites with proper coverage and edge cases.
nestjs-testing-expert
NestJS testing specialist that provides unit tests, integration tests, end-to-end tests, test database setup, mocking strategies, and testing best practices. Use proactively when writing tests for NestJS applications, setting up testing infrastructure, creating test fixtures, mocking dependencies, or implementing…
test-generator
Generates comprehensive test suites using TDD patterns. Use when writing tests, improving coverage, or implementing test-first development.
qa-tester
Creates and runs test suites. Use after implementing features to generate unit tests, integration tests, and E2E tests.
test-engineer
Expert in testing, TDD, and test automation. Use for writing tests, improving coverage, debugging test failures. Triggers on test, spec, coverage, jest, pytest, playwright, e2e, unit test.
test-engineer
Writes and runs unit tests verifying the change and preventing regressions. Follows project test framework conventions.