AI agents call get_all_tags to retrieve information from Obsidian MCP Tool Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries tag data from an Obsidian vault with no described side effects, matching the Read category definition. While the description is empty, the name is clear and consistent with other retrieval operations on the server. The low severity reflects minimal blast radius—retrieving tags poses no risk of data loss or unauthorized actions.
From the tool's definition Tool name 'get_all_tags' indicates retrieval of tags without modification. Server description states 'reading/writing notes' with 'reading' as a primary capability.
Documented attack patterns abuse exactly the kind of access get_all_tags gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Obsidian MCP Tool Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_all_tags:
{
"version": "1",
"default": "deny",
"tools": {
"get_all_tags": {}
}
}get_all_tags is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_all_tags. It is categorised as a Read tool in the Obsidian MCP Tool Server MCP Server, which means it retrieves data without modifying state.
Register the Obsidian MCP Tool Server MCP server in PolicyLayer and add a rule for get_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 Obsidian MCP Tool Server. Nothing to install.
get_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 get_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 get_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.
get_all_tags is provided by the Obsidian MCP Tool Server MCP server (rwb3n/obsidian-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 18 Obsidian MCP Tool Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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18 Obsidian MCP Tool Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.