diff --git a/packages/core-shared/src/instrumentation/tracer.interface.ts b/packages/core-shared/src/instrumentation/tracer.interface.ts
new file mode 100644
index 0000000..a086ca8
--- /dev/null
+++ b/packages/core-shared/src/instrumentation/tracer.interface.ts
@@ -0,0 +1,16 @@
+export type AttributeValue = string | number | boolean | null;
+
+export type SpanOpts = {
+  name: string;
+  op?: "use-case" | "controller" | "repository" | "service" | string;
+  attributes?: Record<string, AttributeValue>;
+};
+
+export interface ISpan {
+  setAttribute(key: string, value: AttributeValue): void;
+  setStatus(status: "ok" | "error", message?: string): void;
+}
+
+export interface ITracer {
+  startSpan<T>(opts: SpanOpts, fn: (span: ISpan) => Promise<T>): Promise<T>;
+}