Returns domain-clustered file groups for parallel test generation. Files in the same cluster share associations and factories. Files in different clusters can be worked on simultaneously without conflict.
AI agents call get_domain_clusters to retrieve information from Rails Insight without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs a read-only query of codebase analysis to return organizational metadata about file clustering and test generation strategy. This is purely informational with no side effects on the codebase or external systems. The sibling tools (get_model, get_routes, get_overview, etc.) all follow a retrieval pattern consistent with a codebase indexing/analysis server.
From the tool's definition Tool description indicates it 'Returns domain-clustered file groups' — a retrieval operation that provides analysis/organization metadata about codebase structure. No modification, execution, deletion, or financial operations are indicated.
Attacks that exploit this kind of access
Returns domain-clustered file groups for parallel test generation. Files in the same cluster share associations and factories. Files in different clusters can be worked on simultaneously without conflict. It is categorised as a Read tool in the Rails Insight MCP Server, which means it retrieves data without modifying state.
Register the Rails Insight MCP server in PolicyLayer and add a rule for get_domain_clusters: 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 Rails Insight. Nothing to install.
get_domain_clusters 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 get_domain_clusters 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 get_domain_clusters. 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.
get_domain_clusters is provided by the Rails Insight MCP server (@reinteractive/rails-insight). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
get_domain_clusters is one line of Rails Insight'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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