Tools for working with AI.

Anvil makes Prompter, a CLI that installs reusable skills into your AI coding assistants for planning, designing, shipping, and documenting your projects.

Explore Prompter

PrompterReusable workflows for your AI tools.

Terminal

$ prompter init

? Select skills to install:

◉ proposal - change proposals with spec deltas

◉ apply - implement an approved proposal

◉ anvil-studio - images and promo videos

◯ skill-audit - score an existing skill

✓ 12 skills deployed to .claude/skills/

Top skillsPlan, design, ship, and document from one registry.

Claude Code - skills

/anvil-studio: images and promo videos
/proposal /apply: spec-driven changes
/project-orchestrator: plan a new project
/feature-planner: roadmap a feature
/davinci: render-verified UI
/deploy-audit: audit, then ship to a VPS

Prompter: reusable workflows for your AI tools.

Install curated skills into supported coding assistants such as Claude Code, Codex, and Copilot, then run a structured proposal-to-implementation workflow from your terminal.

Terminal - prompter

$ prompter login 1

? Anvil API key: anvil_sk_••••••••••••

✓ Logged in as raka@studio.dev - Pro plan

$ prompter init 2

? Which AI tools do you use? Claude Code, Codex

? Select skills to install:

◉ proposal - change proposals with spec deltas

◉ apply - implement an approved proposal

◉ anvil-studio - images and short promo videos

◉ davinci - render-verified UI design

◯ skill-audit - score an existing skill

✓ 12 skills deployed to .claude/skills/ and .codex/skills/

$ prompter update 3

✓ Registry checked - 2 skills updated

Repository

prompter/
└── changes/
    └── add-rate-limits/
        ├── proposal.md
        ├── tasks.md
        └── specs/auth/spec.md

Every change is files you can diff: a proposal, tasks, and spec deltas.

1
One login connects the CLI to your Anvil plan and its skill catalog.
2
Pick the skills each assistant gets; they deploy into the tool’s own skills directory.
3
Updates re-fetch the registry and refresh deployed skills. Cached skills keep init working offline.

Prompter docs

Skills in action

Watch three skills work.

Build

Spec-driven workflow

proposal · apply · archive

Plan a change in files, build it task by task, then fold it into your specs.

1ProposalDescribe the change in a sentence. Your assistant writes why, what changes, and the spec deltas before touching code.

changes/add-rate-limits/proposal.md

›/proposal Add rate limiting to sign-in. Someone keeps guessing passwords on /api/auth.

# Change: Rate-limit sign-in attempts

## Why

Sign-in has no per-IP limit, so passwords can be

guessed without slowing down.

## What Changes

- Sliding-window limiter on /api/auth/*

- 429 with a Retry-After header

## Impact

- Specs: auth · Code: src/lib/rate-limit.ts

specs/auth/spec.md · ## ADDED Requirements · Requirement: Sign-in rate limit

2ApplyEvery task is implemented and ticked off as it lands, so progress lives in the file.

changes/add-rate-limits/tasks.md

›/apply add-rate-limits

## 1. Limiter

✓ 1.1 Create src/lib/rate-limit.ts

✓ 1.2 Unit tests for window edges

## 2. Routes

✓ 2.1 Wire the limiter into sign-in and sign-up

◐ 2.2 Return 429 with Retry-After working

◯ 2.3 Route tests for the 429 path

3 of 5 tasks done

3ArchiveThe finished change moves to the archive and its deltas merge into your specs.

Claude Code

›/archive add-rate-limits

$ prompter archive add-rate-limits --yes

✓ Proposal and spec deltas validated

✓ auth: 1 requirement added

Change 'add-rate-limits' archived as

'archive/2026-10/2026-10-09-add-rate-limits'.

prompter/
├── specs/auth/spec.md            updated
└── changes/archive/2026-10/
    └── 2026-10-09-add-rate-limits/

Create

Anvil Studio

anvil-studio

From a one-line idea to a reviewed, finished piece, with every stage saved as editable Markdown.

1Idea
At most three questions, each with a starred default you can simply accept.
2Directions
Three directions that differ in idea, layout, and look. It stars one and says why; your pick becomes the plan.
3Drafts
It sketches the layout first, then generates photos that keep the space the words need.
4Review
An art-director pass reads every render at full size and at thumbnail size, then fixes what it finds.
5Deliver
Finals are exported for every platform you named, with spend and licenses written down.

1IdeaAt most three questions, each with a starred default you can simply accept.

Claude Code - anvil-studio

› /anvil-studio poster for the Kopi Pagi launch

Three quick questions:

1What is it for?★ Launch of Kopi Pagi, a weekly bean subscription in Bandung
2Where will it live?★ Instagram feed and an A2 print
3What should it feel like?★ Warm, unhurried, early morning

2DirectionsThree directions that differ in idea, layout, and look. It stars one and says why; your pick becomes the plan.

Three directions

Reading this as: an A2 poster and an Instagram post for home brewers in Bandung, a launch, in a warm, unhurried register.

★ A. “On the step”
one object · weighted band · editorial photo
“Already at the door.”
B. “Last scoop, full bag”
before and after · split · studio product
“Last scoop. Full bag.”
C. “Sunrise in the cup, the obvious one”
single object · flat illustration
“Sunrise, every week.”

✓ plan.md approved: direction A

Layout sketch in flat blocks: wall, open door, step, sun stripe, bag, empty floor — 3DraftsIt sketches the layout first, then generates photos that keep the space the words need.

Generated draft: a kraft coffee bag on a terrazzo step at sunrise — 3DraftsIt sketches the layout first, then generates photos that keep the space the words need.

First render of the Kopi Pagi poster before the review fixes — 4ReviewAn art-director pass reads every render at full size and at thumbnail size, then fixes what it finds.

Final Instagram poster: a kraft coffee bag on a sunlit Bandung doorstep, headline Already at the door. — 5DeliverFinals are exported for every platform you named, with spend and licenses written down.

Final A2 print version of the same poster — 5DeliverFinals are exported for every platform you named, with spend and licenses written down.

Design

Davinci

davinci

UI design that is rendered and checked before you see it.

1PreviewOpinionated layouts built as live HTML previews, split into named sections you can comment on.

.preview/billing/pricing/hifi.html

› make the Plans section feel less crowded

2Three viewportsEvery pass is screenshotted at 390, 768, and 1440 pixels wide.

_snaps/

390

768

1440

3Self-critiqueIt reviews its own screenshots and fixes what it finds before you see the design.

Render check - pass 1

✗ 390: plan cards push the CTA below the fold→ cards collapse behind a monthly/yearly toggle
✗ 768: three columns at 230px each→ two columns, featured plan full width
✗ 1440: hero line runs 92 characters→ capped at 60ch
✓ Re-snapped at 390, 768, 1440: all clear

4ImplementThe approved design is built into your codebase and checked against the approved snaps.

Terminal

Approved: pricing (hifi)

→ app/pricing/page.tsx +142

→ components/pricing/plan-card.tsx +58

→ design/snaps/ 390 · 768 · 1440

Fidelity check against approved snaps

✓ 390 ✓ 768 ✓ 1440

Top skills in the registry.

Each skill is a set of instructions your assistant follows end to end, from the first question to a checked result.

Create
Anvil Studio
anvil-studio
Turns an idea into posters, ads, carousels, mockups, and short promo videos, with an art-director critique before delivery.
See it run
Build
Spec-driven workflow
proposal · apply · archive
Write a change proposal with spec deltas, implement every task as it is ticked off, then archive it into your specs.
See it run
Plan
Project Orchestrator
project-orchestrator
Interviews you to define a new project’s MVP scope, stack, and deployment, then runs a phased roadmap of proposals.
Plan
Feature Planner
feature-planner
Plans a feature on an existing codebase and splits large ones into increments that run in dependency order.
Design
Davinci
davinci
Designs and revises UI like a senior designer: live previews, screenshots at three viewports, and a self-critique before you see them.
See it run
Ship
Deploy Audit
deploy-audit
Checks a codebase for exposed secrets, insecure defaults, and production gaps, then generates a Docker, Compose, and Caddy kit for your VPS.
Design
Design System Generator
design-system-generator
Extracts tokens and per-component contracts from existing pages or screenshots into a design system your agent can build from.
Document
Project Doc Generator
project-doc-generator
Drafts formal deliverables such as a product brief, BRD, FSD, or SRS from your codebase or an interview, as HTML or Markdown.

Your plan decides which skills the registry serves.

Get started with Prompter.

Prompter runs in your terminal and installs into the assistants you already use.

Sign in to your Anvil dashboard, create an API key, then run prompter login and prompter init. Your plan decides which skills the registry serves.

Open web tools Prompter docs

Tools for working with AI.

Prompter: reusable workflows for your AI tools.