AI agents call list_bear_tags to retrieve information from Bear Notes 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 and enumerates existing tags from the Bear note-taking application. It performs a read-only query operation with no side effects, no code execution, no data modification, and no financial impact. The blast radius of misuse is minimal—an agent could discover tag organization but cannot alter, delete, or execute anything. Classified as Read with low severity.
From the tool's definition Tool name 'list_bear_tags' and description 'List all tags from Bear App notes' indicate retrieval of metadata without modification or deletion.
Documented attack patterns abuse exactly the kind of access list_bear_tags gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Bear Notes MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_bear_tags:
{
"version": "1",
"default": "deny",
"tools": {
"list_bear_tags": {}
}
}list_bear_tags is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all tags from Bear App notes. It is categorised as a Read tool in the Bear Notes MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Bear Notes MCP Server MCP server in PolicyLayer and add a rule for list_bear_tags: 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 Bear Notes MCP Server. Nothing to install.
list_bear_tags 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 list_bear_tags 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 list_bear_tags. 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.
list_bear_tags is provided by the Bear Notes MCP Server MCP server (netologist/mcp-bear-notes). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Bear Notes 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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7 Bear Notes MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.