Get available screener field metadata. Returns field names, data types, descriptions,
AI agents call get_screener_fields to retrieve information from Signal8 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 metadata about available fields in a financial screener—it queries structural information rather than executing code, modifying data, or accessing sensitive financial records. Even in the context of a financial research platform, metadata enumeration is a read-only operation with minimal blast radius if misused by an agent. It cannot move money, delete data, or trigger external operations.
From the tool's definition Tool name 'get_screener_fields' and description 'Get available screener field metadata. Returns field names, data types, descriptions' indicate a retrieval operation that returns schema/metadata information with no side effects.
Attacks that exploit this kind of access
Get available screener field metadata. Returns field names, data types, descriptions,. It is categorised as a Read tool in the Signal8 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Signal8 MCP Server MCP server in PolicyLayer and add a rule for get_screener_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 Signal8 MCP Server. Nothing to install.
get_screener_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_screener_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_screener_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_screener_fields is provided by the Signal8 MCP Server MCP server (signal8ai/signal8-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.
Teams ship this data inside their own products. See what a licence covers →