Search and filter API traffic span recordings. Use this tool to: - Find specific API calls by endpoint name, HTTP method, or status code - Search for errors or slow requests - Get recent traffic for a specific endpoint - Debug specific API calls Examples: - Find failed requests: where = { fields: {
AI agents call query_spans to retrieve information from Tusk Drift MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
query_spans performs read-only operations on captured API traffic data. It searches, filters, and retrieves span recordings for analysis and debugging purposes. The tool has no capability to modify, delete, or execute operations—it only retrieves and queries existing observability data. This is a classic Read operation with minimal security risk, appropriate for an observability/debugging platform.
From the tool's definition Tool description states it enables 'search and filter' of API traffic span recordings, with use cases including 'Find specific API calls', 'Search for errors or slow requests', and 'Get recent traffic'.
Documented attack patterns abuse exactly the kind of access query_spans gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Tusk Drift MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for query_spans:
{
"version": "1",
"default": "deny",
"tools": {
"query_spans": {}
}
}query_spans is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Search and filter API traffic span recordings. Use this tool to: - Find specific API calls by endpoint name, HTTP method, or status code - Search for errors or slow requests - Get recent traffic for a specific endpoint - Debug specific API calls Examples: - Find failed requests: where = { fields: {. It is categorised as a Read tool in the Tusk Drift MCP MCP Server, which means it retrieves data without modifying state.
Register the Tusk Drift MCP server in PolicyLayer and add a rule for query_spans: 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 Tusk Drift MCP. Nothing to install.
query_spans 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 query_spans 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 query_spans. 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.
query_spans is provided by the Tusk Drift MCP server (use-tusk/drift-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Tusk Drift MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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6 Tusk Drift MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.