List scores with filtering. Supports both trace and observation scores.
AI agents call listScores to retrieve information from Langfuse Mcp Extended without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and filters existing scores from Langfuse without creating, modifying, or deleting data. Listing/querying operations are pure Read operations with minimal blast radius if misused.
From the tool's definition Tool name 'listScores' and description 'List scores with filtering' indicate a query/retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
List scores with filtering. Supports both trace and observation scores. It is categorised as a Read tool in the Langfuse Mcp Extended MCP Server, which means it retrieves data without modifying state.
Register the Langfuse Mcp Extended MCP server in PolicyLayer and add a rule for listScores: 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 Langfuse Mcp Extended. Nothing to install.
listScores 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 listScores 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 listScores. 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.
listScores is provided by the Langfuse Mcp Extended MCP server (langfuse-mcp-extended). 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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