cache-coherence-patterns-reference SKILL.md skillA
cache-coherence-patterns-reference 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/cache-coherence-patterns-reference@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/cache-coherence-patterns-reference/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260813.2e5e33b, committed Aug 13, 2026
- First version recorded
- Jul 19, 2026
- Size
- 10,519 bytes
- Repository stars
- 11
- License
- MIT
Pure-reference catalog of cache-coherence patterns across the request path. Defines the five-tier cache stack (browser → CDN → reverse-proxy → application → data store), the per-tier cache-writing patterns (cache-aside, write-through, write-back, write-around, refresh-ahead), and the canonical invalidation strategies (TTL-only, event-driven purge, surrogate keys, version-tagged URLs, soft purge), plus an anti-pattern table and a worked multi-tenant coherence-test example. Deep detail lives in…
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
# cache-coherence-patterns-reference ## Overview Keeping cached values consistent with their source of truth across tiers (browser, CDN, reverse-proxy, application, data store). Wrong coherence shows as stale data; wrong invalidation shows as cache stampedes per [references/stampede.md](references/stampede.md). A **pure reference** consumed by per-tier test skills. ## When to use - Designing the cache tiers for a new product / endpoint. - Auditing an existing cache for coherence bugs (stale reads after writes, cross-tenant cache leaks, layered TTLs that fight each other). - PR review of changes to cache headers, Vary, or invalidation triggers. - Investigating "users see stale data" reports. ## How to use this reference 1. **Locate the tier(s)** the value lives in from the five-tier stack - each tier (browser, CDN, reverse proxy, application, data store) has its own TTL and invalidation mechanism. 2. **Choose the write pattern** for the application tier from the cache-writing patterns table (cache-aside, write-through, write-back, write-around, refresh-ahead) based on the read/write mix and how much consistency you need. …
Read the whole file at its exact version.
How to install
mdr add testland/qa/cache-coherence-patterns-reference@sha256:5a5b3648dbad3b91The 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_rni55ms7nsrpbnox)
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Versions
The registry has recorded 5 versions of this file, between Jul 19, 2026 and Aug 13, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260813.2e5e33b latest | 2026-08-13 | 2e5e33b | 10,519 B | A | view · diff |
| git:20260725.89d9e8f | 2026-07-25 | 89d9e8f | 9,985 B | A | view · diff |
| git:20260724.26faef0 | 2026-07-24 | 26faef0 | 9,817 B | A | view · diff |
| git:20260724.d4db756 | 2026-07-24 | d4db756 | 9,935 B | A | view · diff |
| git:20260719.53f73b7 | 2026-07-19 | 53f73b7 | 10,350 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 (10519 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_rni55ms7nsrpbnox GET https://markdownregistry.com/api/v1/resolve?ref=testland/qa/cache-coherence-patterns-reference GET https://markdownregistry.com/api/v1/blob/5a5b3648dbad3b9121ce4f7f3d50d33f277cbcdcbe0d0a2ec2fcc7e7dd1840b8
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