AI agents call get_inbox to retrieve information from Things 3 MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves task data from the Inbox without creating, modifying, deleting, or executing any external operations. It is a straightforward read operation that only fetches existing information. The low severity reflects minimal blast radius if misused by an AI agent – it can only expose task information the user already has access to.
From the tool's definition The tool name is 'get_inbox' and description states 'Get todos from Inbox' – a retrieval operation with no modification or deletion of data.
Documented attack patterns abuse exactly the kind of access get_inbox gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Things 3 MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_inbox:
{
"version": "1",
"default": "deny",
"tools": {
"get_inbox": {}
}
}get_inbox is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get todos from Inbox. It is categorised as a Read tool in the Things 3 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Things 3 MCP Server MCP server in PolicyLayer and add a rule for get_inbox: 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 Things 3 MCP Server. Nothing to install.
get_inbox 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_inbox 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_inbox. 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_inbox is provided by the Things 3 MCP Server MCP server (rossshannon/things3-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 24 Things 3 MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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24 Things 3 MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.