system-design-case-catalog skillA
This file is byte-identical to the first copy the registry indexed. Same content hash, same audit grade.
system-design-case-catalog is agent-read markdown (skill) from hoangnguyen0403/agent-skills-standard: Answer classic system design problems as constraint-to-solution sketches and coach interview practice: URL shortener, rate limiter, news feed, chat, notification, autocomplete, crawler, unique id. Use for interview practice or naming the closest known shape for a new problem..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# Case Catalog ## **Priority: P2 (MEDIUM)** Each classic problem has one defining constraint. Name it first; the rest of the design follows. ## Defining Constraints | Problem | Defining constraint | Decisions that follow | | --- | --- | --- | | URL shortener | Read-heavy by ~100:1, key must be short and unique | Base62 of a distributed counter, cache-first read path, 301 vs 302 choice | | Rate limiter | Decision must be cheap, shared, and correct under concurrency | Token bucket in a shared counter, fail-open or fail-closed rule, `429` plus `Retry-After` | | News feed | Fan-out cost versus read latency, with celebrity skew | Push for normal accounts, pull for celebrities, hybrid merge at read | | Chat | Delivery guarantees and presence at persistent-connection scale | WebSocket gateways, per-conversation ordering, offline queue, read receipts | | Notification | Multi-channel delivery with retries and dedupe | Queue per channel, idempotency key, user preference and quiet hours | | Autocomplete | Sub-100ms prefix lookup over a huge term space | Trie or prefix index in memory, precomputed top-k per prefix, async rebuild | …
Read the whole file at its exact version.
How to install
mdr add hoangnguyen0403/agent-skills-standard/system-design-case-catalog@git:20260913.a7ccfadmdr add hoangnguyen0403/agent-skills-standard/system-design-case-catalog@sha256:8093d8b91a00bc1fPin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_i4wuljtvhxgajapd)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260913.a7ccfad latest | 2026-09-13 | a7ccfad | 3,610 B | A | view · diff |
| git:20260830.00e03f4 | 2026-08-30 | 00e03f4 | 3,289 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 (3610 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
hoangnguyen0403/agent-skills-standard · 571 stars · license MIT · pushed 2026-09-24 · branch develop
API
GET https://markdownregistry.com/api/v1/artifacts/art_i4wuljtvhxgajapd GET https://markdownregistry.com/api/v1/resolve?ref=hoangnguyen0403/agent-skills-standard/system-design-case-catalog GET https://markdownregistry.com/api/v1/blob/8093d8b91a00bc1f440bbea943260ff43e4d111b0ff650c8364c61fc273cbcb2
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