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 skills add LambdaTest/agent-skills --skill serenity-bdd-skillgit clone --depth 1 https://github.com/LambdaTest/agent-skillsWrote 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/skills/lambdatest/agent-skills/serenity-bdd-skill)<a href="https://agentmods.dev/skills/lambdatest/agent-skills/serenity-bdd-skill"><img src="https://agentmods.dev/badge/skills/lambdatest/agent-skills/serenity-bdd-skill/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/skills/lambdatest/agent-skills/serenity-bdd-skill"><img src="https://agentmods.dev/badge/skills/lambdatest/agent-skills/serenity-bdd-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00072 | $0.01006 |
| Opus 5.5 | $0.00029 | $0.00402 |
| Sonnet 5.5 | $0.00014 | $0.00201 |
| Haiku 4.5 | $0.00007 | $0.00101 |
Grade A, and why
serenity-bdd-skill 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.
How it starts
The opening of the file, as written. The whole thing — 176 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Serenity BDD Skill
Core Patterns
Step Library Pattern
import net.serenitybdd.annotations.Step;
import net.serenitybdd.core.pages.PageObject;
public class LoginSteps extends PageObject {
@Step("Navigate to login page")
public void navigateToLogin() {
openUrl(getDriver().getCurrentUrl() + "/login");
}
@Step("Enter email: {0}")
public void enterEmail(String email) {
find(By.id("email")).sendKeys(email);
}
@Step("Enter password")
public void enterPassword(String password) {
find(By.id("password")).sendKeys(password);
}
@Step("Click login button")
public void clickLogin() {
find(By.cssSelector("button[type='submit']")).click();
}
@Step("Should see the dashboard")
public void shouldSeeDashboard() {
assertThat(getDriver().getCurrentUrl()).contains("/dashboard");
assertThat(find(By.cssSelector(".welcome")).isDisplayed()).isTrue();
}
}
Test Class
import net.serenitybdd.junit5.SerenityJUnit5Extension;
import net.serenitybdd.annotations.Steps;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
@ExtendWith(SerenityJUnit5Extension.class)
public class LoginTest {
@Steps LoginSteps loginSteps;
@Test
void shouldLoginWithValidCredentials() {
loginSteps.navigateToLogin();
loginSteps.enterEmail("[email protected]");
loginSteps.enterPassword("password123");
loginSteps.clickLogin();
loginSteps.shouldSeeDashboard();
}
}
Screenplay Pattern
import net.serenitybdd.screenplay.*;
public class Login implements Performable {
private final String email, password;
public Login(String email, String password) {
this.email = email; this.password = password;
}
@Override
public <T extends Actor> void performAs(T actor) {
actor.attemptsTo(
Enter.theValue(email).into(LoginPage.EMAIL_FIELD),
Enter.theValue(password).into(LoginPage.PASSWORD_FIELD),
Click.on(LoginPage.LOGIN_BUTTON)
);
}
public static Login withCredentials(String email, String password) {
return new Login(email, password);
}
}
// Usage
actor.attemptsTo(Login.withCredentials("[email protected]", "pass123"));
actor.should(seeThat(TheWebPage.currentUrl(), containsString("/dashboard")));
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 176 lines · 72 tokens per session scan A 8de3458e0ffa
serenity-bdd-skill is a skill published in the GitHub repository LambdaTest/agent-skills (387 stars, last pushed 2d ago), licensed MIT. It adds 72 tokens to every session and 1,006 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 2026-09-03.
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