AI agents call listTasks to retrieve information from Ava without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns task data without creating, modifying, deleting, or executing operations. It is a straightforward read operation that retrieves existing task information for display purposes.
From the tool's definition Tool name 'listTasks' and description 'ユーザーのタスク一覧を取得する' (retrieve user's task list) indicate data retrieval with no side effects.
Documented attack patterns abuse exactly the kind of access listTasks gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ava, and nothing reaches the server without passing your rules. This is the rule we recommend for listTasks:
{
"version": "1",
"default": "deny",
"tools": {
"listTasks": {}
}
}listTasks is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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ユーザーのタスク一覧を取得する。. It is categorised as a Read tool in the Ava MCP Server, which means it retrieves data without modifying state.
Register the Ava MCP server in PolicyLayer and add a rule for listTasks: 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 Ava. Nothing to install.
listTasks 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 listTasks 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 listTasks. 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.
listTasks is provided by the Ava MCP server (yutakobayashidev/ava). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Ava, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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10 Ava tools catalogued and risk-classified — across an index of 43,000+ MCP servers.