Search documents in memory banks by tags
AI agents call search_documents_by_tags to retrieve information from Memory Bank 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 or queries documents based on tag criteria without creating, modifying, deleting, executing code, or performing financial operations. It is a non-destructive read operation with minimal blast radius—worst case, an AI agent could retrieve unintended documents from the memory bank, but no data loss or system compromise would occur.
From the tool's definition Tool name 'search_documents_by_tags' and description 'Search documents in memory banks by tags' indicate a query/search operation with no modification of data.
Documented attack patterns abuse exactly the kind of access search_documents_by_tags gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Memory Bank MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for search_documents_by_tags:
{
"version": "1",
"default": "deny",
"tools": {
"search_documents_by_tags": {}
}
}search_documents_by_tags is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Search documents in memory banks by tags. It is categorised as a Read tool in the Memory Bank MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Memory Bank MCP Server MCP server in PolicyLayer and add a rule for search_documents_by_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 Memory Bank MCP Server. Nothing to install.
search_documents_by_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 search_documents_by_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 search_documents_by_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.
search_documents_by_tags is provided by the Memory Bank MCP Server MCP server (t3ta/memory-bank-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Memory Bank 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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4 Memory Bank MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.