synthesis

synthesis is a skill for Claude Code from chipweaver/veripower. It costs 23 tokens per session (869 once invoked), scanned A, original, MIT.

A skill for synthesis, the step that turns digital hardware design code into a circuit description, using Synopsys Design Compiler. It also reviews timing, area, and power reports.

In plain words
What is it for?
Use it to synthesize hardware, analyze reports, add timing exceptions, and rerun synthesis after RTL code changes.
Why use it?
It carries timing rules into the synthesis run and provides a documented way to check whether the resulting circuit meets them.

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 Use it to synthesize hardware, analyze reports, add timing exceptions, and rerun synthesis after RTL code changes.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/chipweaver/veripower/synthesis
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 synthesis
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 synthesis

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/chipweaver/veripower/synthesis"><img src="https://agentmods.dev/badge/skills/chipweaver/veripower/synthesis.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 869 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 $0.00869
Opus 5.5 $0.00009 $0.00348
Sonnet 5.5 $0.00005 $0.00174
Haiku 4.5 $0.00002 $0.00087

Measured 1mo ago against content hash edd5ba46c032, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

synthesis 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 6 executable files (scripts/synthesis/__init__.py, scripts/synthesis/__main__.py, scripts/synthesis/bootstrap.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/synthesis/SKILL.md · 74 lines

How it starts

The opening of the file, as written. The whole thing — 74 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Synthesis

Establish the implementation and evidence needed for the current task. Read dispatch.json, the original intent, requirements, RTL and constraints, and the materials carried into {workdir}. A new dispatch requires a current conclusion; it does not prescribe a new synthesis. Use measurements whose implementation, conditions and scope still apply, and perform the work the remaining questions need.

Write under {workdir}; upstream inputs remain read-only. The framework carries previously published setup and products into this directory, without the old verdict. Keep useful analysis and comparison material in evidence/.

Tools

<skill> is this skill's directory. Setup, execution and judgment are independent operations:

python3 <skill>/scripts/synthesis/__main__.py bootstrap --workdir {workdir}

Bootstrap refreshes scripts/rtl_load.tcl and constraints.sdc from upstream inputs. It installs missing config.tcl, constraints.local.sdc and driver scripts, preserving existing copies of these editable files. manifest.module supplies the top; rtl-files.json supplies source order and include paths. Adapt scripts/dc_run.tcl for the required calculation. The supplied script maps RTL using DC-Ultra; examining an existing mapped implementation may require different tool work.

Render the design's declared generated clocks and timing exceptions from constraint-annotations.json into constraints.local.sdc, which follows constraints.sdc. Check names and divider ratios against RTL. Record the engineering basis for exceptions, local clock uncertainty and library-specific IO settings alongside the SDC commands.

Set the actual LIB_DB and WIRE_LOAD_MODEL (a library model or none) in config.tcl, then run:

cd {workdir}
python3 <skill>/scripts/synthesis/__main__.py run --workdir .

run computes in a temporary directory using the current setup. Scripts write outputs relative to out/ and reports/ in their working directory, including supplementary reports, and read inputs at explicit paths. Existing reports are withdrawn; out/ and reports/ are replaced only after successful, readable output. The log and failed calculation remain available until retry. Wait for completion and inspect warnings and conditions.

Read the full file on GitHub · 74 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 · -108 lines · -19 tokens per session edd5ba46c032
  2. 1mo ago Changed · -1 lines 8476e2c6b646
  3. 1mo ago Changed · +14 lines 9e8a49ecb4c4
  4. 1mo ago First seen · 169 lines · 42 tokens per session scan A ef941c3ecd8b

Subscribe to this mod's changes

synthesis is a skill published in the GitHub repository chipweaver/veripower (10 stars, last pushed 7d ago), licensed MIT. It adds 23 tokens to every session and 869 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.