Nefesh

Send sensor data (heart rate, voice, facial expression, text sentiment), get back a unified state with a machine-readable action your agent can follow directly. Zero prompt engineering required.

On the 2nd+ call, the response includesadaptation_effectiveness— telling your agent whether its previous approach actually worked. A closed-loop feedback system for self-improving agents.

Most APIs give you a state. Nefesh tells you whether your reaction to that state actually worked.

On the 2nd+ call within a session, every response includes:

{ "state": "focused", "stress_score": 45, "suggested_action": "simplify_and_focus", "adaptation_effectiveness": { "previous_action": "de-escalate_and_shorten", "previous_score": 68, "current_score": 45, "stress_delta": -23, "effective": true } }

Your agent can readeffective: trueand know its previous de-escalation worked. Ifeffective: false, the agent adjusts its strategy. No other human-state system provides this feedback loop.

Option A: Connect first, get a key through your agent (fastest)

Add the configwithout an API key— your agent will get one automatically.

{ "mcpServers": { "nefesh": { "url": "https://mcp.nefesh.ai/mcp" } } }

"Get me a free Nefesh API key using my email address"

The agent callsrequest_api_key→ you click one email link → the agent picks up the key. No signup form, no manual copy-paste. After that, add the key to your config for future sessions:

{ "mcpServers": { "nefesh": { "url": "https://mcp.nefesh.ai/mcp", "headers": { "X-Nefesh-Key": "nfsh_free_..." } } } }

{ "mcpServers": { "nefesh": { "url": "https://mcp.nefesh.ai/mcp", "headers": { "X-Nefesh-Key": "YOUR_API_KEY" } } } }

{ "servers": { "nefesh": { "type": "http", "url": "https://mcp.nefesh.ai/mcp", "headers": { "X-Nefesh-Key": "<YOUR_API_KEY>" } } } }

{ "context_servers": { "nefesh": { "settings": { "url": "https://mcp.nefesh.ai/mcp", "headers": { "X-Nefesh-Key": "<YOUR_API_KEY>" } } } } }

A2A Integration (Agent-to-Agent Protocol v1.0)

Nefesh is also available as an A2A-compatible agent. While MCP handles tool-calling (your agent calls Nefesh), A2A enables agent-collaboration — other AI agents can communicate with Nefesh as a peer.

A2A Endpoint:POST https://mcp.nefesh.ai/a2a(JSON-RPC 2.0)

Same authentication as MCP —X-Nefesh-Keyheader orAuthorization: Bearertoken. Free tier works on both protocols.

Your AI agent can get a free API key autonomously. You only click one email link.
- Agent asks you: "What is your email address?"
- Agent callsrequest_api_key(your_real_email). No API key needed for this call.
- You receive a verification email and click the link
- Agent pollscheck_api_key_status(your_real_email)every 10 seconds
- Once verified, the agent receives the API key and can use all other tools

Important:The agent must use your real, accessible email address. Disposable emails are blocked. The verification link must be clicked by you to activate the key.

Free tier: 1,000 calls/month, all signal types, 10 req/min. No credit card.

After adding the config, ask your AI agent:

"What tools do you have from Nefesh?"

Prefer the terminal over MCP? Use the Nefesh CLI (10-32x lower token cost than MCP for AI agents):

npm install -g @nefesh/cli nefesh ingest --session test --heart-rate 72 --tone calm nefesh state test --json

- No video or audio uploads — edge processing runs client-side
- No PII stored
- GDPR/BIPA compliant — cascading deletion viadelete_subject
- Not a medical device — for contextual AI adaptation only

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