AI agents call list-buckets to retrieve information from Microsoft Planner MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only operation that queries and returns bucket information from Microsoft Planner without creating, modifying, or deleting any data. It has minimal blast radius if misused by an AI agent, as it only exposes existing organizational structure data.
From the tool's definition Tool name is 'list-buckets' and description states 'List all buckets in a Planner plan' — retrieves bucket data with no side effects.
Documented attack patterns abuse exactly the kind of access list-buckets gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Microsoft Planner MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for list-buckets:
{
"version": "1",
"default": "deny",
"tools": {
"list-buckets": {}
}
}list-buckets is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all buckets in a Planner plan. It is categorised as a Read tool in the Microsoft Planner MCP MCP Server, which means it retrieves data without modifying state.
Register the Microsoft Planner MCP server in PolicyLayer and add a rule for list-buckets: 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 Microsoft Planner MCP. Nothing to install.
list-buckets 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 list-buckets 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 list-buckets. 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.
list-buckets is provided by the Microsoft Planner MCP server (vyente-ruffin/microsoft-planner-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Microsoft Planner MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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9 Microsoft Planner MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.