Get all unique tags across the vault with their occurrence counts.
AI agents call obsidian_list_all_tags to retrieve information from Mcp Apple Obsidian 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 data from an Obsidian vault. It performs no state changes, side effects, or external operations. The operation is purely informational—counting and listing existing tags. There is no capacity for data destruction, financial impact, or code execution. The blast radius of misuse is minimal, as the worst outcome is exposure of tag metadata that is already present in the user's vault.
From the tool's definition The tool name is 'obsidian_list_all_tags' and its description explicitly states it 'Get all unique tags across the vault with their occurrence counts.' This is a read-only query operation that retrieves metadata about tags without modifying or executing any…
Attacks that exploit this kind of access
Get all unique tags across the vault with their occurrence counts. It is categorised as a Read tool in the Mcp Apple Obsidian MCP Server, which means it retrieves data without modifying state.
Register the Mcp Apple Obsidian MCP server in PolicyLayer and add a rule for obsidian_list_all_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 Mcp Apple Obsidian. Nothing to install.
obsidian_list_all_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 obsidian_list_all_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 obsidian_list_all_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.
obsidian_list_all_tags is provided by the Mcp Apple Obsidian MCP server (rex/mcp-apple-obsidian). 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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