Nefesh

What is Nefesh?

Nefesh is an MCP server that gives AI agents real-time awareness of human physiological state. It accepts sensor data (heart rate, voice, facial expression, text sentiment) and returns a unified state with a machine-readable action for the agent, including adaptation_effectiveness on subsequent calls for closed-loop feedback.

How to use Nefesh?

Add the server URL to your MCP client config (e.g., ~/.cursor/mcp.json). Use Option A: connect without an API key and ask your agent to call request_api_key — after clicking a verification email, the agent retrieves the key automatically. Option B: sign up at nefesh.ai/signup for a free key (1,000 calls/month) and include it in the config headers. All agents connect via Streamable HTTP — no local installation required.

Key features of Nefesh

• Seven tools including ingest, get_human_state, and delete_subject
• Self‑provisioning: agent fetches API key autonomously after email verification
• Returns adaptation_effectiveness on second+ call for closed‑loop feedback
• Free tier: 1,000 calls/month with no credit card
• No video/audio uploads; edge processing runs client‑side
• GDPR/BIPA compliant with delete_subject for cascading deletion

Use cases of Nefesh

• AI coaching agents that adapt tone and timing based on user stress state
• Productivity assistants that pause or reframe tasks when detecting cognitive load
• Companion agents that respond to emotional signals with appropriate empathy
• Autonomous interview bots that modify pacing based on candidate facial expression

FAQ from Nefesh

How does Nefesh handle data privacy?

No video or audio is uploaded — edge processing runs client‑side. No PII is stored. The delete_subject tool enables cascading deletion for GDPR/BIPA compliance. Nefesh is not a medical device.

What are the rate limits and pricing?

Free tier: 1,000 calls/month, all signal types, 10 requests per minute. Paid Solo plan: $25/month for 50,000 calls. Enterprise plan offers custom SLA and pricing.

What transport does Nefesh use?

Streamable HTTP — no local installation needed. All MCP clients connect via a URL.

How does self‑provisioning work?

The agent calls request_api_key(email) without an API key. After you click a verification link, the agent polls check_api_key_status every 10 seconds and receives the key automatically.

What data can I delete?

You can delete all stored data for a subject using the delete_subject tool — this triggers full GDPR/BIPA‑compliant deletion.