Compare individual ad source instances within mediation waterfalls. Use for:
AI agents call ad_source_instance_comparison to retrieve information from AdMob MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool's function is to retrieve and compare ad performance metrics from existing ad sources. It performs read-only operations on AdMob data without creating, modifying, deleting, or executing any changes. The entire suite of sibling tools (trend analysis, performance metrics, breakdowns) are all analytical/reporting functions with no side effects. This falls clearly into the Read category with low severity.
From the tool's definition Tool name 'ad_source_instance_comparison' and description 'Compare individual ad source instances' indicates data retrieval and analysis. No mention of modification, deletion, execution, or financial transactions.
Attacks that exploit this kind of access
Compare individual ad source instances within mediation waterfalls. Use for:. It is categorised as a Read tool in the AdMob MCP Server MCP Server, which means it retrieves data without modifying state.
Register the AdMob MCP Server MCP server in PolicyLayer and add a rule for ad_source_instance_comparison: 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 AdMob MCP Server. Nothing to install.
ad_source_instance_comparison 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 ad_source_instance_comparison 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 ad_source_instance_comparison. 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.
ad_source_instance_comparison is provided by the AdMob MCP Server MCP server (willhou/admob-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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