AI agents use merge_notes_enhanced 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.
Merging notes modifies existing data by combining them, which is a Write operation. The severity is medium because while the operation is reversible (notes can typically be recovered or the merge undone), merging multiple notes could result in loss of organizational structure or formatting if not carefully controlled.
From the tool's definition Tool name 'merge_notes_enhanced' combined with description 'Enhanced note merging with options' indicates a tool that combines or modifies multiple notes into a consolidated form. Merging is a data modification operation that reversibly combines content.
Documented attack patterns abuse exactly the kind of access merge_notes_enhanced 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 merge_notes_enhanced:
{
"version": "1",
"default": "deny",
"tools": {
"merge_notes_enhanced": {
"limits": [
{
"counter": "merge_notes_enhanced_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}merge_notes_enhanced 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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Enhanced note merging with options. 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 merge_notes_enhanced: 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.
merge_notes_enhanced 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 merge_notes_enhanced 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 merge_notes_enhanced. 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.
merge_notes_enhanced is provided by the Obsidian MCP Server MCP server (kynlos/obsidian-mcp). 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.
Free to start. No card required.
120 Obsidian MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.