AI agents call query_by_tag to retrieve information from Unity without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about GameObjects matching a tag filter. It performs no side effects, does not execute code, does not modify or delete data, and does not trigger external operations. It is a straightforward read operation analogous to a search or list query. The blast radius of misuse is minimal—an AI agent could retrieve information about tagged objects but cannot cause harmful state changes.
From the tool's definition Tool description states 'Find all GameObjects in the project with a specific Unity tag' — a query operation with no modification, deletion, or execution of code/actions.
Attacks that exploit this kind of access
Find all GameObjects in the project with a specific Unity tag. It is categorised as a Read tool in the Unity MCP Server, which means it retrieves data without modifying state.
Register the Unity MCP server in PolicyLayer and add a rule for query_by_tag: 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 Unity. Nothing to install.
query_by_tag 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 query_by_tag 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 query_by_tag. 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.
query_by_tag is provided by the Unity MCP server (verysleepylemon/unity-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
query_by_tag is one line of Unity's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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