AI agents call read-note to retrieve information from Obsidian MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves note content from an Obsidian vault without modifying, deleting, or executing anything. It is a pure read operation with no side effects. While the server has access to the file system, this particular tool is scoped to retrieval only, making it low severity. The confidence is high because the name and description are explicit and unambiguous.
From the tool's definition Tool name is 'read-note' and description states 'Read the content of a specific note'. The server description confirms this tool provides 'read' capability without side effects.
Documented attack patterns abuse exactly the kind of access read-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 read-note:
{
"version": "1",
"default": "deny",
"tools": {
"read-note": {}
}
}read-note is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Read the content of a specific note. It is categorised as a Read tool in the Obsidian MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Obsidian MCP Server MCP server in PolicyLayer and add a rule for read-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.
read-note is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the read-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 read-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.
read-note is provided by the Obsidian MCP Server MCP server (piotr1215/mcp-obsidian). 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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9 Obsidian MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.