tp-design-audit

tp-design-audit is a skill for Claude Code from CurtisThe/three-pillars-plugin. It costs 23 tokens per session (3,544 once invoked), scanned A, original, Apache-2.0.

A pre-coding review of a detailed software design against the existing codebase. It checks whether the proposed interfaces, data structures, resources, and implementation plan fit the code that already exists.

In plain words
What is it for?
Use it to validate a design document before implementation, check its connection to existing files and systems, and identify feasibility problems early.
Why use it?
It finds conflicts and impractical assumptions before development begins, when they are cheaper to fix. The review can also update the design and plan when needed.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter. Also seen: mentions subagents; built for aider.

Part of the three-pillars plugin — 40 skills, 58 agents shipped together

Good fit Use it to validate a design document before implementation, check its connection to existing files and systems, and identify feasibility problems early.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/curtisthe/three-pillars-plugin/tp-design-audit
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 CurtisThe/three-pillars-plugin --skill tp-design-audit
Clone the repo
git clone --depth 1 https://github.com/CurtisThe/three-pillars-plugin

Made for: Claude Code.

Or install three-pillars, the plugin that ships this one along with the rest of its 40 skills, 58 agents.

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 tp-design-audit

README.md
[![agentmods](https://agentmods.dev/badge/skills/curtisthe/three-pillars-plugin/tp-design-audit/github.svg)](https://agentmods.dev/skills/curtisthe/three-pillars-plugin/tp-design-audit)
Your own site
<a href="https://agentmods.dev/skills/curtisthe/three-pillars-plugin/tp-design-audit"><img src="https://agentmods.dev/badge/skills/curtisthe/three-pillars-plugin/tp-design-audit/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 tp-design-audit

Your own site · 80×15
<a href="https://agentmods.dev/skills/curtisthe/three-pillars-plugin/tp-design-audit"><img src="https://agentmods.dev/badge/skills/curtisthe/three-pillars-plugin/tp-design-audit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,544 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 $0.00023 $0.03544
Opus 5.5 $0.00009 $0.01418
Sonnet 5.5 $0.00005 $0.00709
Haiku 4.5 $0.00002 $0.00354

Measured today against content hash 35fe378f7480, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

tp-design-audit 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 today.

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.

skills/tp-design-audit/SKILL.md · 175 lines

How it starts

The opening of the file, as written. The whole thing — 175 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Design Audit

Thorough multi-angle review of a detailed design against the actual codebase. Catches interface mismatches, schema conflicts, resource constraints, and implementation feasibility issues before code is written.

Argument: {design-name} (required) — must match an existing directory under three-pillars-docs/tp-designs/.

Prerequisites

  • three-pillars-docs/tp-designs/{design-name}/detailed-design.md must exist.

Steps

  1. Run first-run preflight per skills/_shared/first-run.md.

0. Preflight

Run the collaboration preflight per skills/_shared/collaboration.md with phase: "design-audit". The audit may update detailed-design.md and plan.md in Step 8 — the lock ensures those edits come from the rightful owner. Honor --force-takeover if passed.

0b. Repo-map preamble (optional)

Per skills/_shared/repo-map-preamble.md. If aider is on PATH, generate a structural map of the codebase before audit. Use it to focus the parallel exploration agents in Step 2 — verifying interfaces against files PageRank confirms exist is faster than launching agents blind.

1. Load design artifacts

Read both design.md and detailed-design.md from the design directory.

1b. Read project context

Read project docs per skills/_shared/read-project-docs.md. Check that the design does not contradict decisions recorded in architecture.md. Flag contradictions as INCONSISTENT findings.

1c. Vision alignment check

Read three-pillars-docs/vision.md if it exists and explicitly evaluate:

  • Advances the vision? Which problem, principle, or user from three-pillars-docs/vision.md does this design serve? If you can't name one, flag this as a CRITICAL MISALIGNMENT finding — either the design should not be built, or the vision is stale and needs /tp-docs-update.
  • Conflicts with non-goals? Does any module, behavior, or interface in the detailed design cross into territory the vision has marked as a non-goal? Flag as CRITICAL MISALIGNMENT with a specific citation (file path in detailed-design + vision bullet).
  • Violates principles? Does the design's approach trade away a vision principle for convenience? (e.g., vision says "no network calls" but the design introduces a telemetry endpoint). Flag as MEDIUM MISALIGNMENT unless the design explicitly acknowledges and justifies the trade-off in its own document.

Read the full file on GitHub · 175 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. today Changed 35fe378f7480
  2. 9d ago Changed · +9 lines 200cdca741e7
  3. 29d ago Changed · +20 lines 79037c5a7d91
  4. 1mo ago First seen · 146 lines · 23 tokens per session scan A 4aabc0faa1df

Subscribe to this mod's changes

tp-design-audit is a skill published in the GitHub repository CurtisThe/three-pillars-plugin (4 stars, last pushed yesterday), licensed Apache-2.0. It adds 23 tokens to every session and 3,544 once invoked, about $0.0001 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 2026-08-31.