Instrument MCP tool calls with semantically appropriate span

Signed-off-by: Eric Peterson <ericpeterson@spotify.com>
2026-04-28 17:55:32 +02:00
parent eab8f7a510
commit 8916f83bee
7 changed files with 346 additions and 38 deletions
@@ -15,6 +15,23 @@
 */

 export interface Config {
+  backend?: {
+    tracing?: {
+      capture?: {
+        /**
+         * When true, the tool call's input arguments and output result are
+         * included on the MCP `tools/call` server span as
+         * `gen_ai.tool.call.arguments` and `gen_ai.tool.call.result`.
+         * These attributes are marked Opt-In by the OpenTelemetry GenAI
+         * semantic conventions because they may contain sensitive
+         * information (entity payloads, scaffolder inputs, free-form
+         * text). Defaults to false.
+         */
+        toolPayloads?: boolean;
+      };
+    };
+  };
+
  mcpActions?: {
    /**
     * Display name for the MCP server. Defaults to "backstage".