Discover Bruno collections in a directory tree
AI agents call bruno_discover_collections to retrieve information from Bruno MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs filesystem traversal to identify and enumerate Bruno API test collections. It retrieves metadata about existing collections without creating, modifying, deleting, or executing any operations. The discovery operation is informational only, consistent with Read category operations like 'list' and 'find'. Low severity because discovering collection locations poses minimal risk to the system or data.
From the tool's definition Tool name 'discover' and description 'Discover Bruno collections in a directory tree' indicate data retrieval without modification. The action is to list or search for existing collections, producing no side effects.
Attacks that exploit this kind of access
Discover Bruno collections in a directory tree. It is categorised as a Read tool in the Bruno MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Bruno MCP Server MCP server in PolicyLayer and add a rule for bruno_discover_collections: 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 Bruno MCP Server. Nothing to install.
bruno_discover_collections 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 bruno_discover_collections 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 bruno_discover_collections. 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.
bruno_discover_collections is provided by the Bruno MCP Server MCP server (jcr82/bruno-mcp-server). 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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