gate-design

gate-design is a skill for Claude Code, Codex from Oreo-Mcflurry/claude-gate. It costs 20 tokens per session (1,124 once invoked), scanned A, original, MIT.

A review guide for technical design documents, covering API contracts, data models, component architecture, and technology choices. An API contract describes how software services exchange requests and responses.

In plain words
What is it for?
Use it to check endpoints, request and response formats, authentication, database structure, indexes, migrations, component boundaries, and technology trade-offs.
Why use it?
It helps find missing decisions and design risks before engineers start implementation.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to check endpoints, request and response formats, authentication, database structure, indexes, migrations, component boundaries, and technology trade-offs.

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Install with agentmods
npx agentmods add skills/oreo-mcflurry/claude-gate/gate-design
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add Oreo-Mcflurry/claude-gate --skill gate-design
Clone the repo
git clone --depth 1 https://github.com/Oreo-Mcflurry/claude-gate

Made for: Claude Code, 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.

agentmods badge for gate-design

README.md
[![agentmods](https://agentmods.dev/badge/skills/oreo-mcflurry/claude-gate/gate-design/github.svg)](https://agentmods.dev/skills/oreo-mcflurry/claude-gate/gate-design)
Your own site
<a href="https://agentmods.dev/skills/oreo-mcflurry/claude-gate/gate-design"><img src="https://agentmods.dev/badge/skills/oreo-mcflurry/claude-gate/gate-design/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.

agentmods 80×15 button for gate-design

Your own site · 80×15
<a href="https://agentmods.dev/skills/oreo-mcflurry/claude-gate/gate-design"><img src="https://agentmods.dev/badge/skills/oreo-mcflurry/claude-gate/gate-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,124 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 original 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00020 $0.01124
Opus 5 $0.00010 $0.00562
Sonnet 5 $0.00004 $0.00225
Haiku 4.5 $0.00002 $0.00112

Measured 8d ago against content hash 08da58019f4d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

gate-design 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 8d 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/gate-design/SKILL.md · 150 lines

How it starts

The opening of the file, as written. The whole thing — 150 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Design Gate Review Instructions

You are a Design Reviewer conducting a quality gate review for technical design documents. Your role is to ensure the design is sound, scalable, and well-thought-out before implementation begins.

Review Criteria

1. API Contracts

Check:

  • Endpoints: RESTful naming, HTTP methods, URL patterns
  • Request/Response: Schemas documented (JSON/GraphQL/gRPC)
  • Error codes: HTTP status codes and error response format
  • Authentication: Auth mechanism specified (JWT, OAuth, API keys)
  • Versioning: API version strategy defined
  • Rate limiting: Throttling and quota policies

Questions to ask:

  • Are endpoints consistent and predictable?
  • Are error cases handled comprehensively?
  • Is backward compatibility considered?

2. Data Model

Check:

  • Schema: Tables/collections with fields and types
  • Relationships: Foreign keys, joins, references
  • Indexes: Query optimization strategy
  • Constraints: Unique, not-null, check constraints
  • Migrations: Schema evolution strategy
  • Data lifecycle: Retention, archival, deletion policies

Questions to ask:

  • Is the model normalized appropriately?
  • Are performance implications considered?
  • Is data integrity enforced?

3. Component Dependencies

Check:

  • Architecture diagram: Component relationships visualized
  • Service boundaries: Clear separation of concerns
  • Communication: Sync/async, protocols (HTTP, gRPC, message queues)
  • Data flow: How data moves through the system
  • Failure modes: Circuit breakers, retries, fallbacks
  • External dependencies: Third-party services, APIs

Questions to ask:

  • Are dependencies loosely coupled?
  • Are circular dependencies avoided?
  • Is the system resilient to component failures?

4. Tech Stack Rationale

Check:

  • Framework/library choices: Justified with reasoning
  • Database selection: SQL vs NoSQL decision explained
  • Infrastructure: Cloud provider, containerization, orchestration
  • Monitoring: Logging, metrics, alerting strategy
  • Testing: Unit, integration, e2e testing approach

Read the full file on GitHub · 150 lines

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.

  1. 8d ago First seen · 150 lines · 20 tokens per session scan A 08da58019f4d

Subscribe to this mod's changes

gate-design is a skill published in the GitHub repository Oreo-Mcflurry/claude-gate (3 stars, last pushed 3mo ago), licensed MIT. It adds 20 tokens to every session and 1,124 once invoked, about $0.0001 per session on Opus 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 2026-08-31.

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