Creates a new note using the given deck, model, fields, and tags. Returns the ID of the created note or null if the note could not be created.
AI agents use addNote to create or update resources in Anki — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Anki environment.
This tool creates new data (notes) in Anki, which is a reversible modification operation. It does not execute arbitrary code, delete data, move funds, or cause irreversible side effects. The blast radius is limited to Anki flashcard data and poses minimal risk if misused by an AI agent—notes can be deleted or edited later. This clearly falls under the Write category.
From the tool's definition Creates a new note using the given deck, model, fields, and tags. Returns the ID of the created note or null if the note could not be created.
Documented attack patterns abuse exactly the kind of access addNote gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Anki, and nothing reaches the server without passing your rules. This is the rule we recommend for addNote:
{
"version": "1",
"default": "deny",
"tools": {
"addNote": {
"limits": [
{
"counter": "addnote_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}addNote stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Creates a new note using the given deck, model, fields, and tags. Returns the ID of the created note or null if the note could not be created. It is categorised as a Write tool in the Anki MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Anki MCP server in PolicyLayer and add a rule for addNote: 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 Anki. Nothing to install.
addNote is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the addNote 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 addNote. 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.
addNote is provided by the Anki MCP server (ujisati/anki-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Anki, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
40 Anki tools catalogued and risk-classified — across an index of 43,000+ MCP servers.