diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9462db2..f0e45e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## [Unreleased]
 
+### Bugs Fixed
+- Default `InvokeAgentScope` spans to `SpanKind.INTERNAL` while preserving explicit span-kind overrides. [#241](https://github.com/microsoft/opentelemetry-distro-javascript/pull/241)
+
 ### Features Added
 - Add manual `sessionId` propagation to `ExecuteToolScope` and `InferenceScope`, plus opt-in custom baggage enrichment for recognized GenAI spans through `BaggageBuilder.customAttribute()` and `customAttributes()`. [#242](https://github.com/microsoft/opentelemetry-distro-javascript/pull/242)
 - Add GenAI v1.42 InvokeAgent request, response, cache-token, and provider attribute capture for manual A365 scopes. [#239](https://github.com/microsoft/opentelemetry-distro-javascript/pull/239)
diff --git a/src/a365/scopes/InvokeAgentScope.ts b/src/a365/scopes/InvokeAgentScope.ts
index b64c3e7..528b412 100644
--- a/src/a365/scopes/InvokeAgentScope.ts
+++ b/src/a365/scopes/InvokeAgentScope.ts
@@ -28,7 +28,8 @@ export class InvokeAgentScope extends OpenTelemetryScope {
    * @param invokeScopeDetails Scope-level details (endpoint).
    * @param agentDetails The agent identity. `tenantId` is required.
    * @param callerDetails Optional caller information (human, agent, or both for A2A).
-   * @param spanDetails Optional span configuration.
+   * @param spanDetails Optional span configuration. Defaults the span kind to
+   * `SpanKind.INTERNAL` when omitted.
    */
   public static start(
     request: Request,
@@ -59,7 +60,7 @@ export class InvokeAgentScope extends OpenTelemetryScope {
 
     const resolvedSpanDetails: SpanDetails = {
       ...spanDetails,
-      spanKind: spanDetails?.spanKind ?? SpanKind.CLIENT,
+      spanKind: spanDetails?.spanKind ?? SpanKind.INTERNAL,
     };
 
     super(
diff --git a/test/internal/unit/a365/scopes.test.ts b/test/internal/unit/a365/scopes.test.ts
index 4728e6a..5ad566a 100644
--- a/test/internal/unit/a365/scopes.test.ts
+++ b/test/internal/unit/a365/scopes.test.ts
@@ -1003,8 +1003,8 @@ describe("Scopes", () => {
     });
 
     it.each([
-      ["CLIENT (default)", undefined, SpanKind.CLIENT],
-      ["SERVER", SpanKind.SERVER, SpanKind.SERVER],
+      ["INTERNAL (default)", undefined, SpanKind.INTERNAL],
+      ["SERVER (override)", SpanKind.SERVER, SpanKind.SERVER],
     ])("InvokeAgentScope spanKind: %s", (_label, input, expected) => {
       const scope = InvokeAgentScope.start(
         testRequest,