AI agents call search_items 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.
The search_items tool retrieves or queries existing items from the Things 3 task management system without creating, modifying, or deleting data. It is a read-only operation that has no side effects beyond returning search results. The blast radius of misuse is minimal—an AI agent could only over-search or consume API quota, not cause data loss or financial harm.
From the tool's definition Tool name 'search_items' and description 'Search for items in Things' indicate a query/retrieval operation with no modification or deletion of data.
Documented attack patterns abuse exactly the kind of access search_items 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 search_items:
{
"version": "1",
"default": "deny",
"tools": {
"search_items": {}
}
}search_items is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Search for items in Things. 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 search_items: 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.
search_items 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_items 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_items. 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_items 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.