varnish-test-vtc-syntax SKILL.md skillA
varnish-test-vtc-syntax from testland/qa is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add testland/qa/varnish-test-vtc-syntax@git:20260813.2e5e33bPins git:20260813.2e5e33b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- testland/qa
- Path
plugins/qa-cache-testing/skills/varnish-test-vtc-syntax/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260813.2e5e33b, committed Aug 13, 2026
- First version recorded
- Jun 3, 2026
- Size
- 6,807 bytes
- Repository stars
- 11
- License
- MIT
Wraps the varnishtest CLI + VTC (Varnish Test Case) syntax for testing VCL configurations. Covers the VTC test-file format (varnishtest scripts with server { ... } + client { ... } + varnish v1 -vcl+backend { ... } blocks), the grace-mode + saint-mode behaviours (stale-while-revalidate + stale-if-error equivalents in VCL), the PURGE method handler pattern (vcl_purge subroutine + ACL guards), and surrogate-key invalidation via xkey vmod. Use when authoring or testing Varnish-based caching layers.
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
# varnish-test-vtc-syntax
## Overview
`varnishtest` (CLI) executes `.vtc` (Varnish Test Case) files
that spin up a Varnish instance + a mock backend + a mock
client in-process. Per
[varnish-cache.org/docs](https://varnish-cache.org/docs/), VTC is
the canonical way to test VCL - Varnish's configuration language - without a real network.
## When to use
- Authoring or modifying VCL.
- Testing PURGE handlers, grace/saint mode, surrogate-key logic.
- Regression-testing VCL after Varnish version bump.
- CI gate before a VCL deploy.
## Authoring
### Install
Varnish ships `varnishtest` in the standard distribution:
```bash
apt install varnish # Debian/Ubuntu
brew install varnish # macOS
varnishtest -v # verify
```
### Anatomy of a VTC
```
varnishtest "basic cache hit test"
server s1 {
rxreq
txresp -hdr "Cache-Control: max-age=60" -body "hello"
} -start
varnish v1 -vcl+backend {
// VCL goes here
} -start
client c1 {
txreq -url "/"
rxresp
expect resp.status == 200
expect resp.body == "hello"
txreq -url "/"
rxresp
expect resp.http.x-cache == "HIT" // assumes vcl_deliver sets this
} -run
varnish v1 -expect cache_hit == 1
```
…Read the whole file at its exact version.
How to install
mdr add testland/qa/varnish-test-vtc-syntax@sha256:4c025bffc5cdca00The line at the top of this page pins the label git:20260813.2e5e33b, 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_6ewskteylrubnox3)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Jun 3, 2026 and Aug 13, 2026, about one every 18 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260813.2e5e33b latest | 2026-08-13 | 2e5e33b | 6,807 B | A | view · diff |
| git:20260724.d4db756 | 2026-07-24 | d4db756 | 6,796 B | A | view · diff |
| git:20260706.4e1409c | 2026-07-06 | 4e1409c | 7,132 B | A | view · diff |
| git:20260615.c62f985 | 2026-06-15 | c62f985 | 7,149 B | A | view · diff |
| git:20260603.21eda0e | 2026-06-03 | 21eda0e | 7,067 B | A | view |
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 (6807 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
testland/qa · 11 stars · license MIT · pushed 2026-10-20 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_6ewskteylrubnox3 GET https://markdownregistry.com/api/v1/resolve?ref=testland/qa/varnish-test-vtc-syntax GET https://markdownregistry.com/api/v1/blob/4c025bffc5cdca00ec66fefde1f30a8d5a0041e6cddc7788294573cb4ec6dc18
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.