AI agents use append_to_daily_note to create or update resources in Obsidian Ai Curator — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Obsidian Ai Curator environment.
This tool adds content to an existing daily note in the Obsidian vault. It is a Write operation as it modifies an existing file by appending data, but the action is reversible (the appended content can be removed). The blast radius is medium since it could pollute or corrupt important daily notes if misused by an AI agent.
From the tool's definition Append content to daily note
Documented attack patterns abuse exactly the kind of access append_to_daily_note gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Obsidian Ai Curator, and nothing reaches the server without passing your rules. This is the rule we recommend for append_to_daily_note:
{
"version": "1",
"default": "deny",
"tools": {
"append_to_daily_note": {
"limits": [
{
"counter": "append_to_daily_note_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}append_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.
Free to start. No card required.
Append content to daily note. It is categorised as a Write tool in the Obsidian Ai Curator MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Obsidian Ai Curator MCP server in PolicyLayer and add a rule for append_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 Obsidian Ai Curator. Nothing to install.
append_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 append_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 append_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.
append_to_daily_note is provided by the Obsidian Ai Curator MCP server (nwant/obsidian-ai-curator). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Obsidian Ai Curator, 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.
27 Obsidian Ai Curator tools catalogued and risk-classified — across an index of 43,000+ MCP servers.