List observations (generations, spans, events) with cursor-based pagination. Includes usage metrics, costs, and latency.
AI agents call listObservations 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.
This tool retrieves and queries observational data (generations, spans, events) from Langfuse with no side effects. It does not create, modify, delete, or execute operations—it only fetches and presents existing data. The inclusion of metrics and latency information confirms it is a read-only operation.
From the tool's definition Tool name 'listObservations' and description 'List observations' indicate a retrieval/query operation. The phrase 'Includes usage metrics, costs, and latency' confirms data retrieval without modification.
Attacks that exploit this kind of access
List observations (generations, spans, events) with cursor-based pagination. Includes usage metrics, costs, and latency. 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 listObservations: 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.
listObservations 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 listObservations 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 listObservations. 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.
listObservations 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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