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What getCategories does on Memo
AI agents call getCategories to retrieve information from Memo without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why getCategories is rated Low
This tool queries and returns all categories from the memo database without creating, modifying, or deleting any data. It has no side effects beyond retrieving information, making it a Read operation with low severity and minimal blast radius if misused by an AI agent.
From the tool's definition Tool name 'getCategories' and description 'Get all categories' indicate a retrieval operation with no modification or deletion of data.
Attacks that exploit this kind of access
The rule that runs getCategories safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Memo, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For getCategories, this is the rule to start with:
getCategories is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Memo, apply this rule, and every getCategories call is checked against it from then on.
Questions about getCategories
Get all categories. It is categorised as a Read tool in the Memo MCP Server, which means it retrieves data without modifying state.
Register the Memo MCP server in PolicyLayer and add a rule for getCategories: 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 Memo. Nothing to install.
getCategories 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 getCategories 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 getCategories. 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.
getCategories is provided by the Memo MCP server (108yen/memo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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