List all shared interfaces
AI agents call list_interfaces to retrieve information from A2AMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves/queries information about available shared interfaces in the Redis-backed coordination system. It has no side effects, performs no writes, executions, or destructive operations. It is purely informational, consistent with other Read category tools like 'list_active_agents' on the same server.
From the tool's definition Tool description states 'List all shared interfaces' - a retrieval operation with no modification, deletion, or execution capabilities.
Documented attack patterns abuse exactly the kind of access list_interfaces gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and A2AMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for list_interfaces:
{
"version": "1",
"default": "deny",
"tools": {
"list_interfaces": {}
}
}list_interfaces is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
List all shared interfaces. It is categorised as a Read tool in the A2AMCP MCP Server, which means it retrieves data without modifying state.
Register the A2A MCP server in PolicyLayer and add a rule for list_interfaces: 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 A2AMCP. Nothing to install.
list_interfaces 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 list_interfaces 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 list_interfaces. 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.
list_interfaces is provided by the A2A MCP server (webdevtodayjason/a2amcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from A2AMCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
17 A2AMCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.