0n3 — the 0n runtime (0nmcp 5) is an MCP server with 17 tools an agent can call, among them add_contact_note, add_contact_tags, create_contact. It answers at https://0n3.app/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 6 of 6 times since 10 September 2026; the last check, on 19 October 2026, succeeded.
One SSO, hundreds of apps, every endpoint open to your AI. Not workflows. A receipt for every call.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
add_contact_note | Add a note to a CRM contact Inputs: contactId, body |
add_contact_tags | Add tags to a CRM contact Inputs: contactId, tags |
create_contact | Create a new CRM contact Inputs: firstName, lastName, email, phone, tags |
create_opportunity | Create a new opportunity/deal Inputs: name, pipelineId, stageId, contactId, monetaryValue |
get_appointments | Get appointments in a date range Inputs: startTime, endTime, calendarId |
get_calendars | List all CRM calendars |
get_contact | Get a CRM contact by ID Inputs: contactId |
get_custom_fields | List all custom fields |
get_location | Get CRM location details |
get_pipelines | List all CRM pipelines and stages |
search_contacts | Search CRM contacts by name, email, or phone Inputs: query, limit |
search_conversations | Search CRM conversations Inputs: contactId, limit |
search_opportunities | Search CRM opportunities/deals Inputs: pipelineId, query |
send_email | Send an email to a contact Inputs: contactId, subject, htmlBody |
send_message | Send a message (Email, SMS, WhatsApp) Inputs: contactId, type, message, subject |
update_contact | Update a CRM contact Inputs: contactId, firstName, lastName, email, phone |
verify_service | Verify an API key against a service (stripe, github, sendgrid, openai, anthropic, slack, notion, airtable, resend, hubspot, vercel) and return an account summary + a .0n connection descriptor Inputs: service, apiKey |
Every block below points at https://0n3.app/mcp. Pick your client and copy.
claude mcp add --transport http 0n3-the-0n-runtime-0nmcp-5 https://0n3.app/mcp
{
"mcpServers": {
"0n3-the-0n-runtime-0nmcp-5": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://0n3.app/mcp"]
}
}
}{
"mcpServers": {
"0n3-the-0n-runtime-0nmcp-5": {
"url": "https://0n3.app/mcp"
}
}
}{
"servers": {
"0n3-the-0n-runtime-0nmcp-5": {
"type": "http",
"url": "https://0n3.app/mcp"
}
}
}{
"context_servers": {
"0n3-the-0n-runtime-0nmcp-5": {
"url": "https://0n3.app/mcp"
}
}
}{
"mcpServers": {
"0n3-the-0n-runtime-0nmcp-5": {
"serverUrl": "https://0n3.app/mcp"
}
}
}{
"mcpServers": {
"0n3-the-0n-runtime-0nmcp-5": {
"url": "https://0n3.app/mcp"
}
}
}name: 0n3 — the 0n runtime (0nmcp 5)
version: 0.0.1
schema: v1
mcpServers:
- name: 0n3 — the 0n runtime (0nmcp 5)
type: streamable-http
url: https://0n3.app/mcp{
"mcpServers": {
"0n3-the-0n-runtime-0nmcp-5": {
"httpUrl": "https://0n3.app/mcp"
}
}
}{
"mcpServers": {
"0n3-the-0n-runtime-0nmcp-5": {
"type": "http",
"url": "https://0n3.app/mcp"
}
}
}{
"mcpServers": {
"0n3-the-0n-runtime-0nmcp-5": {
"url": "https://0n3.app/mcp"
}
}
}goose://extension?url=https%3A%2F%2F0n3.app%2Fmcp&type=streamable_http&id=0n3-the-0n-runtime-0nmcp-5&name=0n3%20%E2%80%94%20the%200n%20runtime%20%280nmcp%205%29
It answered our last check on 19 October 2026 in 326 ms. Over 6 checks since 10 September 2026 it answered 6. Status here comes from Neuronto's own probes, not from the publisher.
17, as returned by the server's own tools/list on 12 September 2026: add_contact_note, add_contact_tags, create_contact, create_opportunity, get_appointments, get_calendars, get_contact, get_custom_fields, and 9 more.
It answered our last check on 19 October 2026 in 326 ms. Over 6 checks since 10 September 2026 it answered 6.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://0n3.app/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: io.github.0nork. Endpoint host: 0n3.app. ARD identifier: urn:air:io.github.0nork:mcp:0nMCP.
First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.