Find keywords where multiple pages from your site compete against each other. Shows which pages rank for the same query and their respective positions.
AI agents call gsc_cannibalisation to retrieve information from BigQuery MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool queries analytics/search data (Google Search Console) to identify keyword cannibalization patterns. It retrieves and presents data about page rankings and keyword overlaps with no side effects. No data is created, modified, deleted, or used to trigger external actions.
From the tool's definition Tool description states it 'Find keywords' and 'Shows which pages rank' — purely informational queries that retrieve and display existing ranking data without modifying, deleting, or executing external operations.
Documented attack patterns abuse exactly the kind of access gsc_cannibalisation gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and BigQuery MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for gsc_cannibalisation:
{
"version": "1",
"default": "deny",
"tools": {
"gsc_cannibalisation": {}
}
}gsc_cannibalisation is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Find keywords where multiple pages from your site compete against each other. Shows which pages rank for the same query and their respective positions. It is categorised as a Read tool in the BigQuery MCP Server MCP Server, which means it retrieves data without modifying state.
Register the BigQuery MCP Server MCP server in PolicyLayer and add a rule for gsc_cannibalisation: 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 BigQuery MCP Server. Nothing to install.
gsc_cannibalisation 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 gsc_cannibalisation 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 gsc_cannibalisation. 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.
gsc_cannibalisation is provided by the BigQuery MCP Server MCP server (suganthan-mohanadasan/suganthans-bigquery-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 32 BigQuery MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
32 BigQuery MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.