AI agents use save_to_daily_note to create or update resources in Capacities MCP Bridge (Unofficial) — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Capacities MCP Bridge (Unofficial) environment.
This tool creates or modifies data (appends text to a daily note) in a reversible manner. It does not execute code, delete data, or involve financial transactions. Write operations that modify user content are classified as medium severity because an AI agent could inadvertently append unwanted or sensitive information to the user's notes, but the action is reversible through manual deletion or editing.
From the tool's definition Tool name is 'save_to_daily_note' and description indicates it saves text to today's daily note. The server description confirms it supports 'appending to daily notes', which is a write operation that modifies data.
Documented attack patterns abuse exactly the kind of access save_to_daily_note gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Capacities MCP Bridge (Unofficial), and nothing reaches the server without passing your rules. This is the rule we recommend for save_to_daily_note:
{
"version": "1",
"default": "deny",
"tools": {
"save_to_daily_note": {
"limits": [
{
"counter": "save_to_daily_note_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}save_to_daily_note 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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Save text to today\. It is categorised as a Write tool in the Capacities MCP Bridge (Unofficial) MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Capacities MCP Bridge (Unofficial) MCP server in PolicyLayer and add a rule for save_to_daily_note: 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 Capacities MCP Bridge (Unofficial). Nothing to install.
save_to_daily_note 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 save_to_daily_note 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 save_to_daily_note. 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.
save_to_daily_note is provided by the Capacities MCP Bridge (Unofficial) MCP server (natkitten/capacities-mcp-bridge-unofficial). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Capacities MCP Bridge (Unofficial), add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 Capacities MCP Bridge (Unofficial) tools catalogued and risk-classified — across an index of 43,000+ MCP servers.