diff --git a/server/src/nest/assignments/assignments.mcp.ts b/server/src/nest/assignments/assignments.mcp.ts
index ee549f83d..f0eb426a3 100644
--- a/server/src/nest/assignments/assignments.mcp.ts
+++ b/server/src/nest/assignments/assignments.mcp.ts
@@ -117,7 +117,7 @@ export class AssignmentsMcp {
 
   @Tool({
     name: 'set_leg_transport_mode',
-    description: 'Set the travel mode of a route leg for a place assignment. Use direction "outgoing" (default) for the common case: the leg leaving this stop toward the next. Use direction "incoming" ONLY when this stop\'s arriving leg originates from something that is not itself a place assignment (e.g. a flight/train booking arrival, or a morning hotel departure) – setting "incoming" on an ordinary place-to-place leg is stored but has no effect on route rendering, because it targets a column that is only read for non-place origins. transport_mode is a route profile key (e.g. "driving", "walking", "cycling", "transit"); null clears it so the leg inherits the day default.',
+    description: 'Set the travel mode of a route leg for a place assignment. Use direction "outgoing" (default) for the common case: the leg leaving this stop toward the next. Use direction "incoming" ONLY when this stop\'s arriving leg originates from something that is not itself a place assignment (e.g. a flight/train booking arrival, or a morning hotel departure) – setting "incoming" on an ordinary place-to-place leg is stored but has no effect on route rendering, because it targets a column that is only read for non-place origins. transport_mode is a route profile key: "driving", "walking", "cycling", or a plugin profile written as "plugin:<pluginId>/<profileId>". Any other value is stored but drawn as a driving route. null clears it so the leg inherits the day default.',
     inputSchema: {
       tripId: z.number().int().positive(),
       assignmentId: z.number().int().positive(),
diff --git a/server/src/nest/days/days.mcp.ts b/server/src/nest/days/days.mcp.ts
index 13ef856d5..430099d36 100644
--- a/server/src/nest/days/days.mcp.ts
+++ b/server/src/nest/days/days.mcp.ts
@@ -106,7 +106,7 @@ export class DaysMcp {
 
   @Tool({
     name: 'set_day_default_transport_mode',
-    description: 'Set the whole-day default travel mode for a day. transport_mode is a route profile key (e.g. "driving", "walking", "cycling", "transit"); null clears the default. Per-segment leg modes still override this.',
+    description: 'Set the whole-day default travel mode for a day. transport_mode is a route profile key: "driving", "walking", "cycling", or a plugin profile written as "plugin:<pluginId>/<profileId>". Any other value is stored but drawn as a driving route. null clears the default. Per-segment leg modes still override this.',
     inputSchema: {
       tripId: z.number().int().positive(),
       dayId: z.number().int().positive(),
diff --git a/server/tests/unit/mcp/tools-leg-transport-mode.test.ts b/server/tests/unit/mcp/tools-leg-transport-mode.test.ts
index f52cb2b47..00f95c59e 100644
--- a/server/tests/unit/mcp/tools-leg-transport-mode.test.ts
+++ b/server/tests/unit/mcp/tools-leg-transport-mode.test.ts
@@ -70,6 +70,9 @@ describe('Tool: set_leg_transport_mode', () => {
     const day = createDay(testDb, trip.id);
     const place = createPlace(testDb, trip.id);
     const assignment = createDayAssignment(testDb, day.id, place.id);
+    // Seed the incoming column so the assertion below proves it survives; the factory
+    // leaves it NULL, so without this it would pass whether or not the tool touched it.
+    testDb.prepare('UPDATE day_assignments SET incoming_leg_transport_mode = ? WHERE id = ?').run('walking', assignment.id);
 
     await withHarness(user.id, async (h) => {
       const result = await h.client.callTool({
@@ -78,7 +81,7 @@ describe('Tool: set_leg_transport_mode', () => {
       });
       const data = parseToolResult(result) as any;
       expect(data.assignment.leg_transport_mode).toBe('cycling');
-      expect(data.assignment.incoming_leg_transport_mode ?? null).toBeNull(); // outgoing must not touch incoming (panel item 4)
+      expect(data.assignment.incoming_leg_transport_mode).toBe('walking'); // outgoing must not touch incoming (panel item 4)
       expect(broadcastMock).toHaveBeenCalledWith(trip.id, 'assignment:updated', expect.any(Object));
     });
   });
@@ -95,10 +98,10 @@ describe('Tool: set_leg_transport_mode', () => {
     await withHarness(user.id, async (h) => {
       const result = await h.client.callTool({
         name: 'set_leg_transport_mode',
-        arguments: { tripId: trip.id, assignmentId: assignment.id, transport_mode: 'transit', direction: 'incoming' },
+        arguments: { tripId: trip.id, assignmentId: assignment.id, transport_mode: 'walking', direction: 'incoming' },
       });
       const data = parseToolResult(result) as any;
-      expect(data.assignment.incoming_leg_transport_mode).toBe('transit');
+      expect(data.assignment.incoming_leg_transport_mode).toBe('walking');
       expect(data.assignment.leg_transport_mode).toBe('driving'); // outgoing untouched
     });
   });