AI agents call list_apps to retrieve information from Astro MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and lists existing application data from the ASO database without creating, modifying, deleting, or executing any operations. It is a straightforward read-only query operation. The severity is low because listing apps exposes only metadata about which applications are tracked—not sensitive financial data or actionable competitive secrets that would enable direct harm.
From the tool's definition Tool name 'list_apps' and description 'List all tracked applications' indicate a data retrieval operation with no modification, deletion, or execution of external operations.
Documented attack patterns abuse exactly the kind of access list_apps gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Astro MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_apps:
{
"version": "1",
"default": "deny",
"tools": {
"list_apps": {}
}
}list_apps is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all tracked applications. It is categorised as a Read tool in the Astro MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Astro MCP Server MCP server in PolicyLayer and add a rule for list_apps: 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 Astro MCP Server. Nothing to install.
list_apps 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_apps 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_apps. 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_apps is provided by the Astro MCP Server MCP server (timbroddin/astro-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Astro MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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15 Astro MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.