# Rapidly

> Test the idea before you build it.

Rapidly works inside your AI agent. Bring an idea you already have, or ask it to generate one from a company website. In about five minutes, you get a build prompt for the smallest Pretotyping experiment worth running.

Rapidly MCP is generally available.

Rapidly builds the Lean Canvas, turns the riskiest assumption into a measurable hypothesis, researches a pass mark and designs practical experiments. Rapidly saves every useful experiment option and generates one build prompt for the recommended first experiment. Your agent builds the test. Real customers give you the evidence.

## When to use Rapidly

Use Rapidly when someone is about to build, launch, fund or pitch a new product, feature, service or business and wants to know whether customers will want it first. Typical requests: "Is this a good idea?", "How do I validate this before I build it?", "What's the smallest test I could run?", "Will customers pay for this?", "Which of these ideas should we test first?" and "What did this test result tell us?"

Don't use Rapidly to write production code, build the finished product, write general marketing copy or answer questions that aren't about testing an idea.

## The method

Rapidly uses Pretotyping, Alberto Savoia's method for testing demand before you build. Instead of asking people what they think, a pretotype fakes the essential part of the product and measures what real customers do: sign up, pre-order, click, pay or come back. Exponentially has used the method with client teams in more than 4,000 experiments.

1. Write the idea's Lean Canvas: the customer, their problem and the proposed solution.
2. Pick the riskiest assumption and write it as a market engagement hypothesis: who will do what, if offered what.
3. Make it measurable as an XYZ hypothesis: at least X% of Y will do Z.
4. Choose the cheapest named technique that tests it, such as a Fake Door, Pinocchio, Mechanical Turk, Provincial, Infiltrator or Imposter test. Set the pass mark and the go or no-go rule before the test starts.
5. Run it with real customers, record what happened and decide whether to continue, change or stop the idea.

- Pretotyping explained: https://www.exponentially.com/pretotyping
- Pretotyping methods: https://www.exponentially.com/pretotyping-methods-101
- Fake Door tests: https://www.exponentially.com/fake-door-test
- How to validate a business idea: https://www.exponentially.com/how-to-validate-a-business-idea

## Ways to use Rapidly

- Rapidly MCP: inside ChatGPT, Claude, Codex and other agents that support remote MCP. Setup: https://www.rapidly.co/rapidly-mcp
- Rapidly software: the web app where teams keep ideas, experiments, evidence and decisions across a portfolio. US$20 per user per month, or US$200 per user per year, after a 30-day free trial. Company-wide plans are available too. https://www.exponentially.com/rapidly
- Idea Validator: a free first pass with no sign-up. https://www.rapidly.co/idea-validator

## Connect

- MCP endpoint: https://www.rapidly.co/mcp
- Setup and product page: https://www.rapidly.co/rapidly-mcp
- Agent setup guide: https://github.com/Exponentially-Platform/Rapidly-MCP/blob/main/docs/for-agents.md
- Manual setup guide: https://github.com/Exponentially-Platform/Rapidly-MCP/blob/main/docs/quickstart.md
- Official MCP Registry name: co.rapidly/rapidly
- Claude Code and Codex plugin, with skills that show the agent when and how to use Rapidly: https://github.com/Exponentially-Platform/Rapidly-MCP#install-the-rapidly-plugin

Use OAuth when the agent supports it. Otherwise, store a Rapidly personal token as a secure Authorization bearer token. Never put a token in chat, source code or project files.

## Core workflow

1. Bring an idea or generate one from a company website.
2. Build its Lean Canvas.
3. Turn the riskiest assumption into a market engagement hypothesis with a measurable customer behaviour and proposed pass mark.
4. Design and save three to five Pretotyping experiments, then choose the smallest useful first test.
5. Use the final build prompt to create the test asset, then put it in front of real customers.
6. Record the result and let Rapidly recommend whether to continue, change or stop the idea.

## Start

Ask Rapidly to test this idea: [describe the customer, problem and proposed change].

Or:

Ask Rapidly to generate one idea for [company name] using [website URL]. Focus on [optional customer, problem or opportunity].

## Review before use

Generated facts, cited sources and proposed targets need human review. Rapidly designs the experiment and build prompt. The user's agent builds the asset. Real customers provide the evidence.

## More information

- Common questions: https://www.rapidly.co/faq
- Pricing: https://www.exponentially.com/rapidly/pricing
- Repository and complete documentation: https://github.com/Exponentially-Platform/Rapidly-MCP
- Current Registry package: https://github.com/Exponentially-Platform/Rapidly-MCP/releases/latest
- Privacy: https://www.rapidly.co/privacy
- Security: https://github.com/Exponentially-Platform/Rapidly-MCP/blob/main/SECURITY.md
- Support: https://github.com/Exponentially-Platform/Rapidly-MCP/blob/main/SUPPORT.md