[Langfuse] List observations (generations, spans, events) with filters. Observations are the building blocks of traces.
AI agents call langfuse_list_observations to retrieve information from Shepherd MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves observability data from Langfuse without creating, modifying, or deleting records. It enables debugging and analysis of AI agent sessions through read-only access to observations (generations, spans, events). The blast radius is minimal since listing existing observations poses no risk of data modification, financial impact, or code execution.
From the tool's definition Tool name contains 'list' and description states it 'List observations' with filters, retrieving trace building blocks without modification capabilities.
Attacks that exploit this kind of access
[Langfuse] List observations (generations, spans, events) with filters. Observations are the building blocks of traces. It is categorised as a Read tool in the Shepherd MCP MCP Server, which means it retrieves data without modifying state.
Register the Shepherd MCP server in PolicyLayer and add a rule for langfuse_list_observations: 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 Shepherd MCP. Nothing to install.
langfuse_list_observations 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 langfuse_list_observations 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 langfuse_list_observations. 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.
langfuse_list_observations is provided by the Shepherd MCP server (neuralis-in/shepherd-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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