diff --git a/docs/configuration.md b/docs/configuration.md
index bac57bc00..0a8e012cb 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -31,7 +31,7 @@ Main project configuration using a **flat resource model**. Agents, memories, an
       "build": "CodeZip",
       "entrypoint": "main.py",
       "codeLocation": "app/MyAgent/",
-      "runtimeVersion": "PYTHON_3_14",
+      "runtimeVersion": "PYTHON_3_13",
       "networkMode": "PUBLIC",
       "protocol": "HTTP"
     }
@@ -168,7 +168,7 @@ on the next deployment.
   "build": "CodeZip",
   "entrypoint": "main.py",
   "codeLocation": "app/MyAgent/",
-  "runtimeVersion": "PYTHON_3_14",
+  "runtimeVersion": "PYTHON_3_13",
   "networkMode": "PUBLIC",
   "envVars": [{ "name": "MY_VAR", "value": "my-value" }],
   "instrumentation": {
diff --git a/docs/container-builds.md b/docs/container-builds.md
index 5d82d2f03..08aa35a91 100644
--- a/docs/container-builds.md
+++ b/docs/container-builds.md
@@ -81,7 +81,7 @@ In `agentcore.json`, set `"build": "Container"`:
   "build": "Container",
   "entrypoint": "main.py",
   "codeLocation": "app/MyAgent/",
-  "runtimeVersion": "PYTHON_3_14"
+  "runtimeVersion": "PYTHON_3_13"
 }
 ```
 
diff --git a/src/cli/operations/agent/generate/__tests__/schema-mapper.test.ts b/src/cli/operations/agent/generate/__tests__/schema-mapper.test.ts
index a96db26a9..e9590652c 100644
--- a/src/cli/operations/agent/generate/__tests__/schema-mapper.test.ts
+++ b/src/cli/operations/agent/generate/__tests__/schema-mapper.test.ts
@@ -87,7 +87,7 @@ describe('mapGenerateConfigToAgent', () => {
     expect(result.name).toBe('TestProject');
     expect(result.build).toBe('CodeZip');
     expect(result.entrypoint).toBe('main.py');
-    expect(result.runtimeVersion).toBe('PYTHON_3_14');
+    expect(result.runtimeVersion).toBe('PYTHON_3_13');
     expect(result.networkMode).toBe('PUBLIC');
     expect(result.protocol).toBe('HTTP');
   });
diff --git a/src/cli/tui/screens/mcp/__tests__/types.test.ts b/src/cli/tui/screens/mcp/__tests__/types.test.ts
index a3306544b..f534d3896 100644
--- a/src/cli/tui/screens/mcp/__tests__/types.test.ts
+++ b/src/cli/tui/screens/mcp/__tests__/types.test.ts
@@ -1,4 +1,10 @@
-import { AUTHORIZER_TYPE_OPTIONS, ENTER_KB_ID_MANUALLY, SKIP_FOR_NOW, TARGET_TYPE_OPTIONS } from '../types.js';
+import {
+  AUTHORIZER_TYPE_OPTIONS,
+  ENTER_KB_ID_MANUALLY,
+  PYTHON_VERSION_OPTIONS,
+  SKIP_FOR_NOW,
+  TARGET_TYPE_OPTIONS,
+} from '../types.js';
 import { describe, expect, it } from 'vitest';
 
 describe('MCP types constants', () => {
@@ -26,4 +32,12 @@ describe('MCP types constants', () => {
     // the screen branches on this exact id when the user picks the manual path.
     expect(ENTER_KB_ID_MANUALLY).toBe('__enter_kb_id__');
   });
+
+  it('PYTHON_VERSION_OPTIONS defaults to a universally-available runtime, not PYTHON_3_14', () => {
+    // 3.14 is not yet GA in every region, so it must not be the first/highlighted pick.
+    expect(PYTHON_VERSION_OPTIONS[0]?.id).toBe('PYTHON_3_13');
+    expect(PYTHON_VERSION_OPTIONS[0]?.id).not.toBe('PYTHON_3_14');
+    // 3.14 stays selectable for users in supported regions.
+    expect(PYTHON_VERSION_OPTIONS.some(opt => opt.id === 'PYTHON_3_14')).toBe(true);
+  });
 });
diff --git a/src/cli/tui/screens/mcp/types.ts b/src/cli/tui/screens/mcp/types.ts
index 482b47ff7..9bfa4da15 100644
--- a/src/cli/tui/screens/mcp/types.ts
+++ b/src/cli/tui/screens/mcp/types.ts
@@ -425,8 +425,8 @@ export const POLICY_ENGINE_MODE_OPTIONS = [
 ] as const;
 
 export const PYTHON_VERSION_OPTIONS = [
-  { id: 'PYTHON_3_14', title: 'Python 3.14', description: 'Latest' },
-  { id: 'PYTHON_3_13', title: 'Python 3.13', description: '' },
+  { id: 'PYTHON_3_13', title: 'Python 3.13', description: 'Recommended' },
+  { id: 'PYTHON_3_14', title: 'Python 3.14', description: 'Not yet available in all regions' },
   { id: 'PYTHON_3_12', title: 'Python 3.12', description: '' },
   { id: 'PYTHON_3_11', title: 'Python 3.11', description: '' },
   { id: 'PYTHON_3_10', title: 'Python 3.10', description: '' },
diff --git a/src/schema/__tests__/constants.test.ts b/src/schema/__tests__/constants.test.ts
index 0c52b8f2c..1f4a5232d 100644
--- a/src/schema/__tests__/constants.test.ts
+++ b/src/schema/__tests__/constants.test.ts
@@ -1,4 +1,5 @@
 import {
+  DEFAULT_PYTHON_VERSION,
   LANGUAGE_FRAMEWORK_MATRIX,
   ModelProviderSchema,
   NetworkModeSchema,
@@ -75,6 +76,11 @@ describe('RuntimeVersionSchemas', () => {
     expect(NodeRuntimeSchema.safeParse('NODE_24').success).toBe(false);
     expect(RuntimeVersionSchema.safeParse('RUBY_3_0').success).toBe(false);
   });
+
+  it('defaults new agents to a universally-available Python runtime (not PYTHON_3_14)', () => {
+    expect(DEFAULT_PYTHON_VERSION).toBe('PYTHON_3_13');
+    expect(PythonRuntimeSchema.safeParse(DEFAULT_PYTHON_VERSION).success).toBe(true);
+  });
 });
 
 describe('NetworkModeSchema', () => {
diff --git a/src/schema/constants.ts b/src/schema/constants.ts
index 35d09fc61..5e6a785fb 100644
--- a/src/schema/constants.ts
+++ b/src/schema/constants.ts
@@ -150,7 +150,7 @@ export const PythonRuntimeSchema = z.enum(['PYTHON_3_10', 'PYTHON_3_11', 'PYTHON
 export type PythonRuntime = z.infer<typeof PythonRuntimeSchema>;
 
 /** Default Python runtime version for new agents and MCP tools */
-export const DEFAULT_PYTHON_VERSION: PythonRuntime = 'PYTHON_3_14';
+export const DEFAULT_PYTHON_VERSION: PythonRuntime = 'PYTHON_3_13';
 
 export const NodeRuntimeSchema = z.enum(['NODE_18', 'NODE_20', 'NODE_22']);
 export type NodeRuntime = z.infer<typeof NodeRuntimeSchema>;