prepend_to_obsidian_note
AI agents call prepend_to_obsidian_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.
The tool name indicates it prepends (adds to the start of) a note, which is a reversible modification of data. This aligns with Write category (creates or modifies data reversibly). However, due to the completely empty description, confidence is lowered substantially. If forced to classify by name alone, Write would be more appropriate than Read, but the missing description prevents higher confidence.
From the tool's definition Tool name 'prepend_to_obsidian_note' suggests it modifies a note by adding content at the beginning, but the description is empty and uninformative.
Attacks that exploit this kind of access
prepend_to_obsidian_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 prepend_to_obsidian_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.
prepend_to_obsidian_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 prepend_to_obsidian_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 prepend_to_obsidian_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.
prepend_to_obsidian_note is provided by the Obsidian MCP Server MCP server (nbaradar/obsidian-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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