How many R-R intervals do I need for SDNN?

You need at least 5 readings to ensure the SDNN calculation is statistically reliable.

What is the minimum requirement for RMSSD?

The calculate_rmssd capability requires at least 3 readings to function.

Can I use this with Claude?

Yes, you can use this MCP with any MCP-compatible client, including Claude.

What information is needed for a coherence classification?

To classify coherence, your agent typically needs the calculated HRV metrics, your age, and your sex.

Do I need to host this myself?

No, Vinkius hosts and manages the MCP so it is ready to use immediately after you connect.

What is the difference between RMSSD and SDNN?

RMSSD measures short-term variation (parasympathetic activity), while SDNN assesses total variability. Both metrics are calculated using dedicated capabilities: calculate_rmssd for the former and calculate_sdnn for the latter.

Do I need to provide age and sex?

Yes. The classification of your coherence level requires demographic context. The classify_coherence_level capability uses your age and sex to compare calculated metrics against established physiological norms.

What are the minimum requirements for input data?

Data constraints vary by metric. calculate_rmssd requires a minimum of 3 readings, and calculate_sdnn requires at least 5 readings to ensure statistical reliability.

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Connect HRV Coherence 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. Turn raw R-R intervals into actionable autonomic nervous system data.

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.

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.

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 HRV Coherence Calculator.

01
Calculate sdnn
This capability calculates the SDNN metric from your provided R-R intervals. It requires at least 5 readings to ensure statistical reliability.
02
Calculate rmssd
Use this capability to find the RMSSD value from a set of R-R intervals. You need a minimum of 3 readings for the calculation.
03
Classify coherence level
This capability classifies cardiorespiratory coherence levels by analyzing your HRV metrics.

Real work

What teams actually run

Automated HRV Reporting

Your agent takes a list of intervals and produces a formatted coherence report.

Quick Variability Checks

You can instantly check if a small sample of R-R data meets the minimum requirements for SDNN or RMSSD.

Physiological Trend Analysis

Your agent processes multiple sets of metrics to help you understand coherence shifts.

Research Data Processing

You hand large batches of R-R intervals to the agent to get statistical reliability checks.

Automate a task

Put HRV Coherence Calculator to work on one thing.

Step-by-step automations your AI runs through this Connector: the workflow, the prompts to start with, and the exact capabilities behind each move.

One connector, every AI

HRV Coherence 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.

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

You don't need a client to put HRV Coherence 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

750ms average. Fast in production.

HRV Coherence Calculator is checked daily against the live service.

Daily averagePeak 956ms

Oct 3Today

Fastest day: 530ms
Slowest day: 956ms
14-day trend: Slowing+32%

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 HRV Coherence Calculator, so you can see the experience inside your AI.

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

HRV Coherence Calculator Connector

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

Connector linkhttps://edge.vinkius.com/vk_preview_q8Z1W6mCsD8fzulGr43xif6HOzbkTnm8wLenyhjD/mcp

Claude Desktop

Follow the steps below to connect in seconds.

1In Claude Desktop, open Settings → Connectors.
2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
3Click Add and start a new chat — HRV Coherence Calculator capabilities are ready to use.

Configuration · claude_desktop_config.jsonCopy

{
  "mcpServers": {
    "hrv-coherence-calculator-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_q8Z1W6mCsD8fzulGr43xif6HOzbkTnm8wLenyhjD/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 HRV Coherence Calculator in Claude and other AIs

See all the AI clients this connector works with ↑

Who it's for

Built for the work HRV Coherence Calculator owners hand off.

This MCP is built for professionals working with physiological data who need to automate the interpretation of heart rate variability.

01
Health Researchers
They hand off raw interval datasets to the AI to get rapid statistical summaries.
02
Biofeedback Practitioners
They use the agent to quickly classify coherence levels for clients.
03
Data Scientists
They use the capabilities to validate HRV metrics without writing custom math functions.

FAQ

Questions HRV Coherence Calculator owners ask.

01
How many R-R intervals do I need for SDNN?
You need at least 5 readings to ensure the SDNN calculation is statistically reliable.
02
What is the minimum requirement for RMSSD?
The calculate_rmssd capability requires at least 3 readings to function.
03
Can I use this with Claude?
Yes, you can use this MCP with any MCP-compatible client, including Claude.
04
What information is needed for a coherence classification?
To classify coherence, your agent typically needs the calculated HRV metrics, your age, and your sex.
05
Do I need to host this myself?
No, Vinkius hosts and manages the MCP so it is ready to use immediately after you connect.
06
What is the difference between RMSSD and SDNN?
RMSSD measures short-term variation (parasympathetic activity), while SDNN assesses total variability. Both metrics are calculated using dedicated capabilities: calculate_rmssd for the former and calculate_sdnn for the latter.
07
Do I need to provide age and sex?
Yes. The classification of your coherence level requires demographic context. The classify_coherence_level capability uses your age and sex to compare calculated metrics against established physiological norms.
08
What are the minimum requirements for input data?
Data constraints vary by metric. calculate_rmssd requires a minimum of 3 readings, and calculate_sdnn requires at least 5 readings to ensure statistical reliability.

Explore

More in Health

Connect HRV Coherence Calculator to Claude, Cursor, ChatGPT & more

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

Each Connector runs inside its own sealed environment.

One switch stops every agent. Instantly.

Spending limits that pause instead of surprise.

We ship only the actions that matter.

01-03

Calculate sdnn

Calculate rmssd

Classify coherence level

What teams actually run

Automated HRV Reporting

Quick Variability Checks

Physiological Trend Analysis

Research Data Processing

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

HRV Coherence Calculator Connector

Claude Desktop

Health Researchers

Biofeedback Practitioners

Data Scientists

How many R-R intervals do I need for SDNN?

What is the minimum requirement for RMSSD?

Can I use this with Claude?

What information is needed for a coherence classification?

Do I need to host this myself?

What is the difference between RMSSD and SDNN?

Do I need to provide age and sex?

What are the minimum requirements for input data?

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