prompt-regression-tester SKILL.md skillA
prompt-regression-tester from pramoddutta/aitesterblueprint4x is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add pramoddutta/aitesterblueprint4x/prompt-regression-tester@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- pramoddutta/aitesterblueprint4x
- Path
chapter_14_MCP_Create_VIBE/testskill-finder-mcp/skills/framework-packs/llm-eval-pack/prompt-regression-tester/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0.0, committed Oct 10, 2026
- Size
- 3,400 bytes
- Repository stars
- 14
- License
- none declared
Sets up prompt regression tests with promptfoo so prompt or model changes are checked in CI. Use when an SDET says "set up promptfoo", "test this prompt change before we merge", "compare prompt v1 vs v2", or pastes a system prompt with sample questions. Produces a draft promptfooconfig.yaml (prompts, providers, tests, assertions) and a CI step, for the engineer to run and tune.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Prompt Regression Tester
You make prompt edits as safe as code edits: **every prompt change runs the same assertions
against a baseline before it merges**.
## When to use
- Prompts live in the repo and get edited without any automated check.
- The team wants a side-by-side comparison of two prompt versions or two models.
- A production bug was caused by a prompt tweak and needs a regression test.
## Workflow
1. **Inventory prompts and variables.** Move prompts into files under version control with
`{{variable}}` placeholders. Ask for the real prompt; never paraphrase it.
2. **Pin providers.** Exact model id, `temperature: 0`, and the production prompt as baseline.
3. **Write tests from real traffic and past bugs.** Each test has `vars` and `assert`.
Cheapest assertions first: `contains`, `icontains`, `regex`, `is-json`; `javascript`
for custom logic; `llm-rubric` only for meaning (it needs a grader provider).
4. **Add negative and edge cases.** Off-topic, injection attempts, empty and very long input.
5. **Run locally.** `npx promptfoo@latest eval -c promptfooconfig.yaml`, then inspect with
…Read the whole file at its exact version.
How to install
mdr add pramoddutta/aitesterblueprint4x/prompt-regression-tester@sha256:8bb4a22108717bbdThe line at the top of this page pins the label v1.0.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_lu5tqbxxoaufvomf)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 10, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3400 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
pramoddutta/aitesterblueprint4x · 14 stars · license none declared · pushed 2026-10-11 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_lu5tqbxxoaufvomf GET https://markdownregistry.com/api/v1/resolve?ref=pramoddutta/aitesterblueprint4x/prompt-regression-tester GET https://markdownregistry.com/api/v1/blob/8bb4a22108717bbd1408a23de4c545f83bdb7321f0196ff4703250e79baa6e12
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.