Add attachment(s) to a note from local file paths.
AI agents use notes.add_attachment to create or update resources in Nucleus Apple — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Nucleus Apple environment.
This tool creates or modifies data reversibly by attaching files to notes. It does not delete data (ruling out Destructive), does not execute arbitrary code or commands (ruling out Execute), does not move money (ruling out Financial), and does not merely retrieve data (ruling out Read).
From the tool's definition Tool name 'notes.add_attachment' and description 'Add attachment(s) to a note from local file paths' indicate modification of existing notes through attachment addition.
Documented attack patterns abuse exactly the kind of access notes.add_attachment gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Nucleus Apple, and nothing reaches the server without passing your rules. This is the rule we recommend for notes.add_attachment:
{
"version": "1",
"default": "deny",
"tools": {
"notes.add_attachment": {
"limits": [
{
"counter": "notes.add_attachment_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}notes.add_attachment 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.
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Add attachment(s) to a note from local file paths. It is categorised as a Write tool in the Nucleus Apple MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Nucleus Apple MCP server in PolicyLayer and add a rule for notes.add_attachment: 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 Nucleus Apple. Nothing to install.
notes.add_attachment 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 notes.add_attachment 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 notes.add_attachment. 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.
notes.add_attachment is provided by the Nucleus Apple MCP server (zish-rob-crur/nucleus-apple-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Nucleus Apple, 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.
30 Nucleus Apple tools catalogued and risk-classified — across an index of 43,000+ MCP servers.