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Connect Test Duration Calculator to ChatGPT and Claude

Set it up once and it works in ChatGPT, Claude, Cursor, and any other client you love. It all runs safely in the background, so you can relax and focus on what really matters. Plan your A/B experiments with statistical precision.

Ask AI about this Connector

Developed, maintained, and hosted by Vinkius.

MCP VERIFIED · PRODUCTION READY · VINKIUS GUARANTEED

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Works with modern AI clients that support MCP, including ChatGPT, Claude, Cursor, and more.

ChatGPTClaudeCursorPerplexityGeminiMicrosoft CopilotRaycastMeta AI

Your AI does the work. We keep it safe and sound.

No other AI tool gives you this. Your workflow runs in the client you already love, your account stays protected, and you decide what the agent can and cannot do. It is the whole reason to make the switch.

Each Connector lives inside our infrastructure, the same place where your workflow runs. The three things below are already part of it, working quietly in the background so you never have to think about them. Nothing to add, nothing to set up, nothing to worry about.

A futuristic MCP client docking bay
V8 Isolate01

Each Connector runs inside its own sealed environment.

Each Connector runs inside its own sealed V8 runtime — no access to your files, your system, or other servers. A Connector never sees past its own request.

Kill Switch02

One switch stops every agent. Instantly.

One action deactivates every Connector, revokes every token, and ends every session at once. AI Governance keeps the record.

FinOps per User03

Spending limits that pause instead of surprise.

Every user keeps their own connections and credentials, isolated from everyone else. Anything that would cross your spending limit is held for your approval, not billed.

Three controls, built into the layer your AI connects through.

Curated set · 3 capabilities

We ship only the actions that matter.

Capability set01 / 01

01-03

3 capabilities in this set.

Part of 3 available through Test Duration Calculator.

  1. 01

    Calculate sample size

    This capability calculates the required sample size for your experiment. It determines the specific number of users needed per variant based on your conversion targets.

  2. 02

    Estimate timeline

    This capability estimates the duration of your experiment. It converts sample size requirements into a calendar timeline of days and recommended full weeks.

  3. 03

    Get finalization details

    This capability provides experiment end dates and risk assessments. It helps you project when a test will finish and flags potential issues from long durations.

Real work

What teams actually run

01

Pre-Experiment Planning

Determine exactly how many users you need before you launch a new variant.

02

Timeline Management

Map out how many weeks a test will take based on your daily traffic.

03

Risk Mitigation

Identify if a test is likely to suffer from external interference due to its length.

04

Resource Allocation

Use projected end dates to schedule follow-up analysis and product releases.

One connector, every AI

Test Duration Calculator works with the most popular AI clients.

These are the most popular clients, each with a step-by-step guide: one link, set up once, with governance and visibility built in. And because everything runs on the MCP standard, the same connection also works in any other compatible client — nothing to rebuild.

ClaudeClaudeChatGPTChatGPTGeminiGeminiPerplexityPerplexityGrokGrokMicrosoft CopilotMicrosoft CopilotCursorCursorVS CodeVS CodeWindsurfWindsurfJetBrainsJetBrainsClineClineLangChainLangChainVercel AI SDKVercel AI SDKLovableLovableZ.aiZ.aiRaycastRaycastQwen CodeQwen CodeKimi CodeKimi CodeLe ChatLe Chat

Building your own app? The connector is yours to use.

You don't need a client to put Test Duration Calculator to work: the same hosted connection plugs into your own applications and agent code, with the same governance on every request. Build with it, chat with it — one connection for both.

Observed, not estimated

689ms average. Fast in production.

Test Duration Calculator is checked daily against the live service.

Daily averagePeak 1232ms
Oct 3Today
Fastest day
534ms
Slowest day
1232ms
14-day trend
Slowing+31%

Connect your client

One URL. Every client.

Activate the Connector, copy your link, and paste it into the client you already use. 3 capabilities arrive ready to run.

Preview access · not provider authentication

The vk_preview_* token belongs to Vinkius preview infrastructure. It lets Claude discover and display the capabilities of Test Duration Calculator, so you can see the experience inside your AI.

It does not authenticate your account with Test Duration Calculator. Actions requiring credentials or live account data may not run until you activate the Connector and authorize the service.

Test Duration Calculator Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_O1AMvmlC1UbiIg5EToBCmgYLv4CFNyrsTcP8VO1g/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — Test Duration Calculator capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "test-duration-calculator-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_O1AMvmlC1UbiIg5EToBCmgYLv4CFNyrsTcP8VO1g/mcp"
    }
  }
}
  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Step-by-step instructions for each client are in the guide. How to connect

Guided setup for Claude? Set up Test Duration Calculator in Claude and other AIs

See all the AI clients this connector works with ↑

Who it's for

Built for the work Test Duration Calculator owners hand off.

This MCP is designed for professionals who manage product experimentation and statistical validity.

  • 01

    Data Scientists

    They use the capability to verify sample requirements and experiment duration.

  • 02

    Product Managers

    They use it to plan experiment timelines and set expectations for stakeholders.

  • 03

    UX Researchers

    They use it to ensure tests have enough power to produce valid results.

FAQ

Questions Test Duration Calculator owners ask.

  • 01

    How do I use this MCP with Claude?

    You connect your Claude client to Vinkius once. After that, your agent can call the calculation capabilities directly during your chat sessions.

  • 02

    Does this capability account for seasonality?

    Yes. The estimate_timeline capability recommends full weeks to ensure you capture complete weekly cycles and avoid seasonality bias.

  • 03

    What is the risk of a long-running experiment?

    Experiments that run too long may trigger a high alert level because they are more susceptible to external interference.

  • 04

    Can I calculate sample sizes for multiple variants?

    Yes. You can specify the number of variants when asking the agent to calculate the required sample size.

  • 05

    Do I need to host the MCP myself?

    No. Vinkius hosts and manages the MCP for you. You just connect your client and start working.

  • 06

    How does the capability handle day-of-week bias?

    The capability uses estimate_timeline to round up the required duration to the nearest full 7-day cycle, ensuring that weekly seasonality does not bias your results.

  • 07

    What is considered a high-risk experiment duration?

    Any experiment projected to run longer than 4 weeks is flagged as high risk by get_finalization_details due to potential external noise like holidays or marketing changes.

  • 08

    Can I calculate sample size for multiple variants?

    Yes, by providing the total number of experimental groups to calculate_sample_size, the capability will determine the cumulative required samples.

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