What is review-system-design-interview?

A project-specific review guide for system-design interview datasets. System design describes how software services and data fit together to handle real-world use.

Use it to audit or critique an interview.json file for technical soundness, production realism, and teaching flow.

It helps find weak architecture, unrealistic production assumptions, unclear teaching steps, and gaps in how an interview explains a solution.

How zeljkoobrenovic/system-design-interviews configures Codex

Reuse

Borrowing it

Nothing to install: this file belongs to zeljkoobrenovic/system-design-interviews. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/zeljkoobrenovic/system-design-interviews/main/.codex/skills/review-system-design-interview/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/zeljkoobrenovic/system-design-interviews

Made for: Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/zeljkoobrenovic/system-design-interviews/review-system-design-interview/github.svg)](https://agentmods.dev/skills/zeljkoobrenovic/system-design-interviews/review-system-design-interview)

Your own site

<a href="https://agentmods.dev/skills/zeljkoobrenovic/system-design-interviews/review-system-design-interview"><img src="https://agentmods.dev/badge/skills/zeljkoobrenovic/system-design-interviews/review-system-design-interview/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/zeljkoobrenovic/system-design-interviews/review-system-design-interview"><img src="https://agentmods.dev/badge/skills/zeljkoobrenovic/system-design-interviews/review-system-design-interview.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 97 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,797 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00097	$0.01797
Opus 5.5	$0.00039	$0.00719
Sonnet 5.5	$0.00019	$0.00359
Haiku 4.5	$0.00010	$0.00180

Measured 2mo ago against content hash 9bab4853d32e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

review-system-design-interview scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.codex/skills/review-system-design-interview/SKILL.md · 160 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

agents/openai.yaml 248 B

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 160 lines · 97 tokens per session scan A 9bab4853d32e

Subscribe to this mod's changes

review-system-design-interview is a skill published in the GitHub repository zeljkoobrenovic/system-design-interviews (11 stars, last pushed 2mo ago), with no licence file. It adds 97 tokens to every session and 1,797 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Learning and teaching

review-system-design-interview next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
review-system-design-interviewzeljkoobrenovic/system-design-interviews	Skill	11	2mo ago	none	A	97	Codex
hr-onboardingnexu-io/open-design	Skill	106k	today	Apache-2.0	A	62	Claude Code, Codex
book-mirrorgarrytan/gbrain	Skill	32k	today	MIT	A	138	Claude Code
exam-forecastanthropics/claude-for-legal	Skill	9.9k	today	Apache-2.0	A	73	Claude Code
lean-formalizewanshuiyin/Auto-claude-code-research-in-sleep	Skill	19k	yesterday	MIT	A	81	Claude Code
deck-course-modulenexu-io/html-anything	Skill	9.4k	yesterday	Apache-2.0	A	25	Claude Code, Codex
eli5companion-inc/feynman	Skill	10k	7d ago	MIT	A	63	Claude Code, Codex

system-design-interviews: Skill for Codex