AI agents call show to retrieve information from Things without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The name 'show' suggests a read/display operation typical of retrieval tools. Absence of modifying keywords (create, update, delete, execute) and its presence among write-capable tools (add-todo, update, update-project) as a sibling indicates it serves a query function.
From the tool's definition Tool name is 'show', which conventionally retrieves or displays data. Description is empty, providing no additional context. Within a productivity app context (Things), 'show' most likely displays or queries existing todos or projects without modification.
Documented attack patterns abuse exactly the kind of access show gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Things, and nothing reaches the server without passing your rules. This is the rule we recommend for show:
{
"version": "1",
"default": "deny",
"tools": {
"show": {}
}
}show is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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show. It is categorised as a Read tool in the Things MCP Server, which means it retrieves data without modifying state.
Register the Things MCP server in PolicyLayer and add a rule for show: 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. Nothing to install.
show 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 show 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 show. 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.
show is provided by the Things MCP server (jimfilippou/things-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Things, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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8 Things tools catalogued and risk-classified — across an index of 43,000+ MCP servers.