Update content in an existing note using text replacements, deletions or precise insertions
AI agents use update_note to create or update resources in Enhanced Obsidian MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Enhanced Obsidian MCP Server environment.
This tool modifies existing notes within an Obsidian knowledge base but does not permanently delete or destroy data. Updates are reversible (can be undone via version history or manual correction), and the scope is limited to content within a single note.
From the tool's definition Tool description states 'Update content in an existing note using text replacements, deletions or precise insertions' — the terms 'update', 'replacements', and 'insertions' indicate reversible modification of data.
Documented attack patterns abuse exactly the kind of access update_note gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Enhanced Obsidian MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for update_note:
{
"version": "1",
"default": "deny",
"tools": {
"update_note": {
"limits": [
{
"counter": "update_note_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_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.
Free to start. No card required.
Update content in an existing note using text replacements, deletions or precise insertions. It is categorised as a Write tool in the Enhanced Obsidian MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Enhanced Obsidian MCP Server MCP server in PolicyLayer and add a rule for update_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 Enhanced Obsidian MCP Server. Nothing to install.
update_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 update_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 update_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.
update_note is provided by the Enhanced Obsidian MCP Server MCP server (jianruidutong/obsidian-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Enhanced 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.
25 Enhanced Obsidian MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.