AI agents call list_available_services to retrieve information from Authbox without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a query operation that enumerates available services without exposing secrets or modifying any data. The blast radius of misuse is minimal—an attacker learns only which services have credentials stored, which is informational only and does not grant access to those credentials or services.
From the tool's definition Tool description states 'List all services that the user has stored credentials for. Returns service names only, no secrets.' This is explicitly a retrieval operation with no side effects and specifically excludes returning sensitive data.
Attacks that exploit this kind of access
List all services that the user has stored credentials for. Returns service names only, no secrets. Useful for discovering what credentials are available before making requests. It is categorised as a Read tool in the Authbox MCP Server, which means it retrieves data without modifying state.
Register the Authbox MCP server in PolicyLayer and add a rule for list_available_services: 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 Authbox. Nothing to install.
list_available_services 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_available_services 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_available_services. 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_available_services is provided by the Authbox MCP server (marucie/authbox). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
list_available_services is one line of Authbox's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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