rtl-design

rtl-design is a skill for Claude Code from chipweaver/veripower. It costs 39 tokens per session (661 once invoked), scanned A, original, MIT.

An RTL design skill writes or modifies Verilog and SystemVerilog, languages used to describe digital hardware circuits. It assigns work for each child module and reviews the resulting files against the intended design.

In plain words
What is it for?
It is for authoring or repairing RTL files and recording each child module's file layout and constraints.
Why use it?
It keeps hardware code aligned with the recorded design intent and separates changes by child module for review.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the veripower plugin — 12 skills, 2 hooks shipped together

Good fit It is for authoring or repairing RTL files and recording each child module's file layout and constraints.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/chipweaver/veripower/rtl-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 chipweaver/veripower --skill rtl-design
Clone the repo
git clone --depth 1 https://github.com/chipweaver/veripower

Made for: Claude Code.

Or install veripower, the plugin that ships this one along with the rest of its 12 skills, 2 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 rtl-design

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/chipweaver/veripower/rtl-design"><img src="https://agentmods.dev/badge/skills/chipweaver/veripower/rtl-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 39 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 661 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 $0.00039 $0.00661
Opus 5.5 $0.00016 $0.00264
Sonnet 5.5 $0.00008 $0.00132
Haiku 4.5 $0.00004 $0.00066

Measured 1mo ago against content hash fe65a5bcb0d0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

rtl-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 1mo ago.

The scan reads SKILL.md. This mod also ships 3 executable files (scripts/rtl/__init__.py, scripts/rtl/__main__.py, scripts/rtl/result.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/rtl-design/SKILL.md · 56 lines

How it starts

The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.

RTL Design

Implement the required behavior and boundary, and resolve findings before delivering the RTL. Read {workdir}/dispatch.json for the input locations. design.md proposes an architecture; requirements.json, the original intent, top-io.json and clocks.json establish the applicable requirements and boundary. Read the sources needed to assess a discrepancy. Upstream artifacts are read-only; write this stage's work under {workdir}.

Implement and review

Choose the module split to suit the task. Continue from carried RTL and use changed inputs, reported failures and decisions in dispatch.json to scope repairs. Preserve unaffected work. Implement directly or delegate cohesive parts using child-task-contract.md. Coordinate shared interfaces and avoid concurrent edits to the same files. Apply the toolchain constraints in coding-rules.md, whether implementing directly or delegating.

Deliver src/, rtl-files.json and constraint-annotations.json. Their formats are in the matching reference schemas. Integrate sources into one global compilation order in rtl-files.json, with the required include search paths. Keep implementation annotations grouped by their owner. Compile the complete file set before closure.

Have an independent reviewer assess the delivered RTL using rtl-review-task-contract.md. Read the findings and their supporting evidence. Resolve disagreements against the requirement, implementation and measurements; request focused reassessment when evidence changes and retain the reviewer's findings.

Assess findings by their acceptance impact, including those labeled non-blocking. Repair demonstrated violations here or return them to their owner; identify evidence needed to assess unmeasured risks.

Use targeted checks to validate repairs and consider affected integration behavior. Changes to acceptance meaning require the user's actual authorization. An authorized change establishes a new scope; it does not prove a previously unsupported technical claim.

Read the full file on GitHub · 56 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. 1mo ago Changed · -16 lines · +10 tokens per session fe65a5bcb0d0
  2. 1mo ago Changed · -5 tokens per session 956ab73d5d5b
  3. 1mo ago Changed · +2 lines fc9c60594fa5
  4. 1mo ago Changed · +1 lines 6b1ebc6e38a9
  5. 1mo ago First seen · 69 lines · 34 tokens per session scan A 62710fa2a17a

Subscribe to this mod's changes

rtl-design is a skill published in the GitHub repository chipweaver/veripower (10 stars, last pushed 7d ago), licensed MIT. It adds 39 tokens to every session and 661 once invoked, about $0.0002 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.