diff --git a/packages/core/src/ai-model/shared/model-locate-result/parse.ts b/packages/core/src/ai-model/shared/model-locate-result/parse.ts
index dd8f8d7a26..35311ad319 100644
--- a/packages/core/src/ai-model/shared/model-locate-result/parse.ts
+++ b/packages/core/src/ai-model/shared/model-locate-result/parse.ts
@@ -43,9 +43,18 @@ export function parseCoordinateList(input: unknown, label: string): number[] {
     throw new Error(`invalid ${label} data: ${JSON.stringify(input)} `);
   }
 
-  const numericValues = values.map((value) =>
-    typeof value === 'number' ? value : Number(value),
-  );
+  const numericValues = values.map((value) => {
+    if (typeof value === 'number') {
+      return value;
+    }
+    if (
+      typeof value !== 'string' ||
+      !/^[+-]?(?:\d+\.?\d*|\.\d+)$/.test(value.trim())
+    ) {
+      return Number.NaN;
+    }
+    return Number(value);
+  });
 
   if (!numericValues.every((value) => Number.isFinite(value))) {
     throw new Error(`invalid ${label} data: ${JSON.stringify(input)} `);
@@ -90,7 +99,7 @@ export function parseNumericLocateResult(
 ): LocateResultValue {
   if (resolvedCoordinates.shape === 'point') {
     const point = parseCoordinateList(input, 'point');
-    if (point.length < 2) {
+    if (point.length !== 2) {
       throw new Error(`invalid point data: ${JSON.stringify(input)} `);
     }
     return createLocateResultValue(resolvedCoordinates, point);
diff --git a/packages/core/tests/unit-test/locate-result-codec.test.ts b/packages/core/tests/unit-test/locate-result-codec.test.ts
index 21d07de863..d4064a2da0 100644
--- a/packages/core/tests/unit-test/locate-result-codec.test.ts
+++ b/packages/core/tests/unit-test/locate-result-codec.test.ts
@@ -122,6 +122,35 @@ describe('createLocateResultCodec', () => {
     ).toThrow(/invalid bbox data/);
   });
 
+  it.each([null, true, false, '', '   '])(
+    'rejects coercible non-coordinate bbox value: %j',
+    (invalidValue) => {
+      const codec = createLocateResultCodec({
+        coordinates: { shape: 'bbox', order: 'xy', normalizedBy: 1000 },
+      });
+
+      expect(() =>
+        codec.toPixelBbox(
+          [invalidValue, 100, 300, 400] as never,
+          locateCtx(640, 360),
+        ),
+      ).toThrow(/invalid bbox data/);
+    },
+  );
+
+  it('accepts decimal coordinate strings without general JavaScript coercion', () => {
+    const codec = createLocateResultCodec({
+      coordinates: { shape: 'bbox', order: 'xy', normalizedBy: 1000 },
+    });
+
+    expect(
+      codec.toPixelBbox(
+        ['100', '200.5', '300.25', '400'] as never,
+        locateCtx(200, 100),
+      ),
+    ).toEqual([20, 20, 60, 40]);
+  });
+
   it('rejects invalid parsed adapter results before coordinate range checks', () => {
     const codec = createLocateResultCodec({
       coordinates: { shape: 'bbox', order: 'xy', normalizedBy: 1000 },
@@ -158,6 +187,16 @@ describe('createLocateResultCodec', () => {
     );
   });
 
+  it('rejects point coordinate values with more than two entries', () => {
+    const codec = createLocateResultCodec({
+      coordinates: { shape: 'point', order: 'xy', normalizedBy: 1000 },
+    });
+
+    expect(() =>
+      codec.toPixelBbox([500, 500, 500], locateCtx(640, 360)),
+    ).toThrow(/invalid point data/);
+  });
+
   it('rejects non-positive normalizedBy values', () => {
     expect(() =>
       createLocateResultCodec({