Get a list of filterable field names and their types for a specified OpenAlex entity.
AI agents call get_filterable_fields to retrieve information from OpenAlex MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a straightforward metadata retrieval operation that returns schema/field information about OpenAlex entities. It performs no data modification, deletion, external execution, or financial operations. The blast radius of misuse is minimal — an attacker gains only knowledge of available filter options, which is low-sensitivity metadata. Classification as Read is appropriate.
From the tool's definition Tool name 'get_filterable_fields' and description state it retrieves 'a list of filterable field names and their types' — a metadata query operation with no side effects, modifications, or code execution.
Attacks that exploit this kind of access
Get a list of filterable field names and their types for a specified OpenAlex entity. It is categorised as a Read tool in the OpenAlex MCP Server MCP Server, which means it retrieves data without modifying state.
Register the OpenAlex MCP Server MCP server in PolicyLayer and add a rule for get_filterable_fields: 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 OpenAlex MCP Server. Nothing to install.
get_filterable_fields 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_filterable_fields 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_filterable_fields. 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_filterable_fields is provided by the OpenAlex MCP Server MCP server (reetp14/openalex-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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