AI agents use export_note_html 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.
Exporting a note as HTML creates a new file artifact (the HTML output) based on existing vault content. This is a Write operation because it generates/creates new data (the HTML file), though it is reversible and has no destructive impact on the original note. The operation has low blast radius since it only produces a read-only derivative artifact without modifying vault state or executing arbitrary code.
From the tool's definition Tool name 'export_note_html' and description 'Export a note as HTML' indicate creation of an output file in a different format.
Documented attack patterns abuse exactly the kind of access export_note_html 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 export_note_html:
{
"version": "1",
"default": "deny",
"tools": {
"export_note_html": {
"limits": [
{
"counter": "export_note_html_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}export_note_html 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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Export a note as HTML. 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 export_note_html: 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.
export_note_html 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 export_note_html 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 export_note_html. 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.
export_note_html 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.
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120 Obsidian MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.