AI agents call get_doc_types to retrieve information from Astrolabe without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves static vocabulary/schema information from a YAML configuration file. It is a read-only operation that queries existing data without creating, modifying, deleting, or executing arbitrary code. The blast radius of misuse is minimal—an agent could only learn the structure of document types, which is informational and non-sensitive in the context of documentation navigation.
From the tool's definition Tool name 'get_doc_types' and description 'Get the document type vocabulary from doc_types.yaml' indicate retrieval of configuration data with no modification or side effects.
Attacks that exploit this kind of access
Get the document type vocabulary from doc_types.yaml. It is categorised as a Read tool in the Astrolabe MCP Server, which means it retrieves data without modifying state.
Register the Astrolabe MCP server in PolicyLayer and add a rule for get_doc_types: 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 Astrolabe. Nothing to install.
get_doc_types 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 get_doc_types 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 get_doc_types. 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.
get_doc_types is provided by the Astrolabe MCP server (zebrr/astrolabe-mcp). 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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