AI agents call meshes_get_connection_fields to retrieve information from Mesheshq without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about connection fields (keys, types, constraints, allowed values) for informational purposes. It performs a read-only query operation with no capability to modify, delete, or execute actions. The blast radius of misuse is minimal—an agent could only retrieve information about available fields, which does not compromise data integrity or enable unauthorized modifications.
From the tool's definition Tool description states it "Get[s] the destination field catalog for a connection" and "Returns field keys, types, constraints, and allowed values." The verb "Get" and "Returns" indicate a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
Get the destination field catalog for a connection. Returns field keys, types, constraints, and allowed values. Useful for building field mappings. It is categorised as a Read tool in the Mesheshq MCP Server, which means it retrieves data without modifying state.
Register the Mesheshq MCP server in PolicyLayer and add a rule for meshes_get_connection_fields: 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 Mesheshq. Nothing to install.
meshes_get_connection_fields 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 meshes_get_connection_fields 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 meshes_get_connection_fields. 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.
meshes_get_connection_fields is provided by the Mesheshq MCP server (mesheshq/meshes-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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