This record as markdown: /tools/hybridlabor-api-aos/browse-vault-library.md
What browse_vault_library does on Aos
AI agents call browse_vault_library to retrieve information from Aos without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why browse_vault_library is rated Low
This tool performs a query/list operation on vault resources with no side effects. The 'read-only' designation confirms it does not create, modify, delete, execute, or commit any changes. The operation is purely informational—listing available items in a vault library.
From the tool's definition Tool description explicitly states 'Read-only: list the vault', indicating it only retrieves and enumerates vault contents without modification.
Attacks that exploit this kind of access
The rule that runs browse_vault_library safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Aos, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For browse_vault_library, this is the rule to start with:
browse_vault_library is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Aos, apply this rule, and every browse_vault_library call is checked against it from then on.
Questions about browse_vault_library
Read-only: list the vault. It is categorised as a Read tool in the Aos MCP Server, which means it retrieves data without modifying state.
Register the Aos MCP server in PolicyLayer and add a rule for browse_vault_library: 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 Aos. Nothing to install.
browse_vault_library 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 browse_vault_library 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 browse_vault_library. 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.
browse_vault_library is provided by the Aos MCP server (@hybridlabor-api/aos). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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