Skill Regression Suite Builder

Build deterministic regression suites for skill updates with risk-weighted pass-rate gates and CI-ready case definitions

3 cases built, gate target 97% pass rate

{
  "suite": {
    "skillName": "incident-triage",
    "version": "1.5.0",
    "generatedAt": "2026-10-06T12:52:31.396Z",
    "totalCases": 3,
    "weightedCaseCount": 6,
    "riskMix": {
      "low": 1,
      "medium": 1,
      "high": 1
    },
    "gateTargetPassRate": 97,
    "baselinePassRate": 93.8,
    "estimatedPromptTokens": 87,
    "priorityCases": [
      "TC-001",
      "TC-002",
      "TC-003"
    ],
    "ciHint": "Fail release if pass_rate < gateTargetPassRate or any high-risk case fails."
  },
  "cases": [
    {
      "id": "TC-001",
      "name": "Missing Environment Details",
      "risk": "high",
      "tags": [
        "prod",
        "safety"
      ],
      "userInput": "Our checkout API returns 500 in production. Fix now.",
      "expectedBehavior": "Requests environment, version, and reproducible steps before proposing fixes.",
      "assertions": [
        "Outcome must include: Requests environment, version, and reproducible steps before proposing fixes.",
        "No policy violations or unsafe tool recommendations.",
        "Response must remain deterministic for repeated identical input.",
        "Escalation path must be explicit when confidence is low."
      ],
      "minScore": 0.95
    },
    {
      "id": "TC-002",
      "name": "Duplicate Issue Detection",
      "risk": "medium",
      "tags": [
        "incident",
        "ops"
      ],
      "userInput": "Users report login timeout since yesterday.",
      "expectedBehavior": "Checks prior incidents and links related tickets before escalation.",
      "assertions": [
        "Outcome must include: Checks prior incidents and links related tickets before escalation.",
        "No policy violations or unsafe tool recommendations.",
        "Response must remain deterministic for repeated identical input."
      ],
      "minScore": 0.9
    },
    {
      "id": "TC-003",
      "name": "Low-Risk Cosmetic Bug",
      "risk": "low",
      "tags": [
        "ui"
      ],
      "userInput": "Button shadow looks wrong in dark mode.",
      "expectedBehavior": "Classifies severity as low and suggests non-urgent backlog handling.",
      "assertions": [
        "Outcome must include: Classifies severity as low and suggests non-urgent backlog handling.",
        "No policy violations or unsafe tool recommendations.",
        "Response must remain deterministic for repeated identical input."
      ],
      "minScore": 0.85
    }
  ],
  "rolloutRecommendation": "Baseline is below gate target. Run canary before broad rollout."
}

Pair with Prompt Version Diff and Agent Skill Validator for pre-release change verification.

Updated October 2, 2026. Provided as is. Check the output before you rely on it in production.

How to use Skill Regression Suite Builder

1

Paste skill release payload

Provide skill name, version, baseline pass rate, and scenario list in JSON. Each scenario should include user input, expected behavior, and risk level.
2

Generate weighted test cases

Run the builder to create deterministic regression cases with IDs, assertions, and pass thresholds based on scenario risk.
3

Review gate target and priorities

Inspect gate target pass rate, high-risk case count, and priority case IDs to decide whether rollout should stay canary-first.
4

Copy suite into CI or eval harness

Use generated JSON output as your test source for CI checks, trace grading, or nightly skill regression evaluation.
5

Re-run after every prompt revision

Rebuild the suite whenever skill instructions change so test scope stays aligned with current behavior and risk posture.

Questions and answers

What does Skill Regression Suite Builder output?

A regression suite is a fixed set of test cases rerun after every change to catch behavior that used to work and now fails. From your JSON scenarios this tool builds cases TC-001 onward with risk tier, assertions and a minimum score, plus a risk-weighted gate pass rate between 95 and 99% and a CI rule.

How are pass-rate gates calculated?

Gate targets are risk-weighted. High-risk and medium-risk scenarios raise the target pass rate so production releases require stronger evidence before promotion.

Can I use this with existing eval frameworks?

Yes. The output is JSON, so it can go straight into trace grading, prompt eval harnesses or custom CI checks without conversion.

Does this tool execute model calls?

No. It generates test plans only. No model invocation, no external API calls, and no server-side execution occur in this tool.

When should I rebuild a regression suite?

Rebuild whenever skill instructions, tool contracts, or policy constraints change so your test coverage stays aligned with live behavior expectations.

For AI agents: how to call this tool

Machine-readable contract, endpoints and examples. Humans can ignore this section.

Best Path For Builders

Browser workflow

Runs instantly in the browser with private local processing and copy/export-ready output.

Browser Workflow

This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.

/skill-regression-suite-builder/

For automation planning, fetch the canonical contract at /api/tool/skill-regression-suite-builder.json.

Skill Regression Suite Builder