AI agents call start_authentication as a supporting operation in Onenote workflows.
Starting an authentication process does not read, write, execute code, destroy data, or move money. It initiates a login/auth flow, which is an identity/session operation that falls outside the standard risk categories. Misuse could facilitate unauthorized access, but the tool itself merely begins the auth handshake.
From the tool's definition 'Start the full authentication process' — initiates an OAuth or similar auth flow
Documented attack patterns abuse exactly the kind of access start_authentication gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Onenote, and nothing reaches the server without passing your rules. This is the rule we recommend for start_authentication:
{
"version": "1",
"default": "deny",
"tools": {
"start_authentication": {
"limits": [
{
"counter": "start_authentication_rate",
"window": "minute",
"max": 60,
"scope": "grant"
}
]
}
}
}start_authentication gets a rate cap, and everything else on the server is denied unless you say otherwise.
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Start the full authentication process. It is categorised as a Other tool in the Onenote MCP Server, which means it performs auxiliary operations.
Register the Onenote MCP server in PolicyLayer and add a rule for start_authentication: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Onenote. Nothing to install.
start_authentication is a Other tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the start_authentication rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for start_authentication. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
start_authentication is provided by the Onenote MCP server (purpleslurple/onenote-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 12 Onenote tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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12 Onenote tools catalogued and risk-classified — across an index of 42,500+ MCP servers.