Skill-scoped relationship subgraph with ranked files. Skills: authentication, database, frontend, api, jobs, email.
AI agents call get_subgraph 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.
This tool queries the Rails codebase index to return relationship data and file rankings organized by skill categories (authentication, database, frontend, api, jobs, email). It has no side effects—it only reads and returns analysis results from the existing index. It poses minimal security risk as a pure information retrieval mechanism.
From the tool's definition Tool description indicates it retrieves and returns a 'relationship subgraph with ranked files' for skill-scoped analysis.
Attacks that exploit this kind of access
Skill-scoped relationship subgraph with ranked files. Skills: authentication, database, frontend, api, jobs, email. 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_subgraph: 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_subgraph 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_subgraph 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_subgraph. 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_subgraph 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.
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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