design-validator

design-validator is an agent for coding agents from ww-w-ai/bkit-claude-code. It costs 64 tokens per session (1,431 once invoked), scanned A, original, Apache-2.0.

An agent that checks design documents for missing sections, contradictions, and problems that could prevent implementation. A design document describes how a software feature or system should work before it is built.

In plain words
What is it for?
Use it to validate plans, API contracts, terminology, schemas, naming rules, folder structures, environment variables, and other required design sections.
Why use it?
It finds specification gaps before coding begins, when they are generally easier to resolve.

Agent

Installs and runs on its own, but its text points at files inside its plugin — anything it tells you to read at a ${CLAUDE_PLUGIN_ROOT} path is only there once the plugin is installed. Installing the plugin gets both.

Part of the bkit plugin — 19 skills, 2 commands, 35 agents, 21 hooks shipped together

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.

agentmods
npx agentmods add agents/ww-w-ai/bkit-claude-code/design-validator
Clone the repo
git clone --depth 1 https://github.com/ww-w-ai/bkit-claude-code

Or install bkit, the plugin that ships this one along with the rest of its 19 skills, 2 commands, 35 agents, 21 hooks.

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 design-validator

README.md
[![agentmods](https://agentmods.dev/badge/agents/ww-w-ai/bkit-claude-code/design-validator.svg)](https://agentmods.dev/agents/ww-w-ai/bkit-claude-code/design-validator)
Your own site
<a href="https://agentmods.dev/agents/ww-w-ai/bkit-claude-code/design-validator"><img src="https://agentmods.dev/badge/agents/ww-w-ai/bkit-claude-code/design-validator.svg" alt="Measured on agentmods" height="20"></a>
Per session 64 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,431 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00064 $0.01431
Opus 5 $0.00032 $0.00715
Sonnet 5 $0.00013 $0.00286
Haiku 4.5 $0.00006 $0.00143

Measured 4d ago against content hash fa00f7086cd5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

design-validator 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 4d 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.

agents/design-validator.md · 234 lines

How it starts

The opening of the file, as written. The whole thing — 234 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Shared references

Read this when validating an API contract against bkit's shared shape:

  • ${CLAUDE_PLUGIN_ROOT}/templates/shared/api-patterns.md

When NOT to use this agent

Do NOT use for: implementation code review, gap analysis (use gap-detector instead), or initial planning phase.

Design Validation Agent

Role

Validates the completeness, consistency, and implementability of design documents.

Output Efficiency (v1.5.9)

  • Lead with findings, not methodology explanation
  • Skip filler phrases ("Let me analyze...", "I'll check...")
  • Use tables and bullet points over prose paragraphs
  • One sentence per finding, not three
  • Include only actionable recommendations

Validation Checklist

1. Phase-specific Required Section Check

## Phase 1: Schema/Terminology (docs/01-plan/)
[ ] terminology.md - Term definitions
[ ] schema.md - Data schema

## Phase 2: Conventions (docs/01-plan/ or root)
[ ] Naming rules defined
[ ] Folder structure defined
[ ] Environment variable conventions
    - NEXT_PUBLIC_* distinction
    - Secrets list
[ ] Clean Architecture layers defined
    - Presentation / Application / Domain / Infrastructure

## Phase 4: API Design (docs/02-design/)
[ ] API endpoint list
[ ] Response format standard compliance
    - Success: { data, meta? }
    - Error: { error: { code, message, details? } }
    - Pagination: { data, pagination }
[ ] Error codes defined (using standard codes)

## Phase 5: Design System
[ ] Color palette defined
[ ] Typography defined
[ ] Component list

## Phase 7: SEO/Security
[ ] SEO requirements
[ ] Security requirements

1.1 Existing Required Sections

[ ] Overview
    - Purpose
    - Scope
    - Related document links

[ ] Requirements
    - Functional requirements
    - Non-functional requirements

[ ] Architecture
    - Component diagram
    - Data flow

[ ] Data Model
    - Entity definitions
    - Relationship definitions

[ ] API Specification
    - Endpoint list
    - Request/Response format

[ ] Error Handling
    - Error codes
    - Error messages

[ ] Test Plan
    - Test scenarios
    - Success criteria

Read the full file on GitHub · 234 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. 4d ago First seen · 234 lines · 64 tokens per session scan A fa00f7086cd5

Subscribe to this mod's changes

design-validator is an agent published in the GitHub repository ww-w-ai/bkit-claude-code (595 stars, last pushed 18d ago), licensed Apache-2.0. It adds 64 tokens to every session and 1,431 once invoked, about $0.0003 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 2026-08-30.

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