AI agents call get_fundamentals_definitions to retrieve information from Tiingo without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves static definitional information about fundamental metrics. It is a pure query operation that does not create, modify, delete, or execute any code. The user cannot misuse this to cause harm as it only returns read-only reference documentation.
From the tool's definition Tool name 'get_fundamentals_definitions' and description 'Get definitions for all available fundamental metrics' indicate a retrieval operation that returns reference data (definitions) with no modifications or side effects.
Attacks that exploit this kind of access
Get definitions for all available fundamental metrics. It is categorised as a Read tool in the Tiingo MCP Server, which means it retrieves data without modifying state.
Register the Tiingo MCP server in PolicyLayer and add a rule for get_fundamentals_definitions: 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 Tiingo. Nothing to install.
get_fundamentals_definitions 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_fundamentals_definitions 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_fundamentals_definitions. 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_fundamentals_definitions is provided by the Tiingo MCP server (major7apps/tiingo-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 →