Create a monthly note for a specific date
AI agents use create_monthly_note to create or update resources in Obsidian MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Obsidian MCP Server environment.
This tool creates a new note in an Obsidian vault, which is a reversible write operation. It does not execute arbitrary code, delete data irreversibly, or move money. The severity is medium because creating notes could be misused to spam or pollute a vault, but the effects are recoverable by deletion. Confidence is high because the name and description clearly indicate a create action.
From the tool's definition Tool name is 'create_monthly_note' and description states 'Create a monthly note for a specific date' — this creates new data (note) in the Obsidian vault.
Documented attack patterns abuse exactly the kind of access create_monthly_note gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Obsidian MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for create_monthly_note:
{
"version": "1",
"default": "deny",
"tools": {
"create_monthly_note": {
"limits": [
{
"counter": "create_monthly_note_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_monthly_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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Create a monthly note for a specific date. It is categorised as a Write tool in the Obsidian MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Obsidian MCP Server MCP server in PolicyLayer and add a rule for create_monthly_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 MCP Server. Nothing to install.
create_monthly_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 create_monthly_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 create_monthly_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.
create_monthly_note is provided by the Obsidian MCP Server MCP server (bazylhorsey/obsidian-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Obsidian MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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29 Obsidian MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.