Usero
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Should I use this
Quality & Safety
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"usero": {
"url": "https://usero.io/mcp"
}
}
}Remote endpoints
https://usero.io/mcpstreamable-httpWhat it can do
Tool inventory
Tools (2)
🟢start_signup(email, clientName)
Start signup without leaving the agent. Ask for the user's email, do not invent one. Sends an email with a Review connection button; the user presses that button, then "Yes, connect" on the page that opens (opening the page alone does nothing). That lets check_signup return an API key for this MCP client. Returns a pollToken for check_signup. No key is shown in the browser. 5 per email per hour; the link expires in 15 minutes.
Input Schema
{
"type": "object",
"properties": {
"email": {
"description": "The user's email address. Ask for it if you do not have it.",
"type": "string",
"maxLength": 254,
"format": "email",
"pattern": "^(?!\\.)(?!.*\\.\\.)([A-Za-z0-9_'+\\-\\.]*)[A-Za-z0-9_+-]@([A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
},
"clientName": {
"description": "The agent client you are running in, e.g. \"Claude Code\", \"Cursor\", \"Windsurf\". Shown in the email and used as the API key name.",
"type": "string",
"minLength": 1,
"maxLength": 60
}
},
"required": [
"email"
],
"$schema": "http://json-schema.org/draft-07/schema#",
"additionalProperties": false
}🔴check_signup(pollToken)
Poll after start_signup. Returns { status: "pending" } until the user presses the button in the email, then { status: "ready", apiKey, setup } exactly once; the pollToken is dead after that. The setup field holds the exact config or command for this client plus what to tell the user (restart, or remove-and-re-add on Desktop). Poll every 5 seconds for up to 15 minutes without ending your turn. On ready, apply the setup snippet at once, then call create_client for the product.
Input Schema
{
"type": "object",
"properties": {
"pollToken": {
"description": "The pollToken returned by start_signup.",
"type": "string",
"minLength": 1
}
},
"required": [
"pollToken"
],
"$schema": "http://json-schema.org/draft-07/schema#",
"additionalProperties": false
}Community
Evidence