diff --git a/ee/app/assets/javascripts/ai/catalog/components/ai_catalog_flow_form.vue b/ee/app/assets/javascripts/ai/catalog/components/ai_catalog_flow_form.vue
index 62818d377d67226a1b2803d754571f2dcae44b5e..e9db1faf5b8938ca3eeb8b6ab8a44bdf604be8bd 100644
--- a/ee/app/assets/javascripts/ai/catalog/components/ai_catalog_flow_form.vue
+++ b/ee/app/assets/javascripts/ai/catalog/components/ai_catalog_flow_form.vue
@@ -13,6 +13,8 @@ import {
   VISIBILITY_LEVEL_PRIVATE,
   VISIBILITY_LEVEL_PUBLIC,
   FLOW_VISIBILITY_LEVEL_DESCRIPTIONS,
+  DEFAULT_FLOW_YML_STRING,
+  DEFAULT_THIRD_PARTY_FLOW_YML_STRING,
 } from 'ee/ai/catalog/constants';
 import { TYPENAME_PROJECT } from '~/graphql_shared/constants';
 import { convertToGraphQLId } from '~/graphql_shared/utils';
@@ -29,6 +31,7 @@ import FormSection from './form_section.vue';
 import VisibilityLevelRadioGroup from './visibility_level_radio_group.vue';
 
 export default {
+  name: 'AiCatalogFlowForm',
   components: {
     ErrorsAlert,
     AiCatalogFormButtons,
@@ -93,21 +96,33 @@ export default {
       type = AI_CATALOG_TYPE_THIRD_PARTY_FLOW;
     }
 
-    const isFlowType = type === AI_CATALOG_TYPE_FLOW;
     const { definition, ...initialValuesWithoutDefinition } = this.initialValues;
+
+    const definitionFlow =
+      type === AI_CATALOG_TYPE_FLOW && definition ? definition : DEFAULT_FLOW_YML_STRING;
+
+    const definitionThirdPartyFlow =
+      type === AI_CATALOG_TYPE_THIRD_PARTY_FLOW && definition
+        ? definition
+        : DEFAULT_THIRD_PARTY_FLOW_YML_STRING;
+
+    const projectId =
+      !this.isGlobal && this.projectId
+        ? convertToGraphQLId(TYPENAME_PROJECT, this.projectId)
+        : this.initialValues.projectId;
+
+    const visibilityLevel = this.initialValues.public
+      ? VISIBILITY_LEVEL_PUBLIC
+      : VISIBILITY_LEVEL_PRIVATE;
+
     return {
       formValues: {
         ...initialValuesWithoutDefinition,
         type,
-        definitionFlow: isFlowType ? definition || '' : '',
-        definitionThirdPartyFlow: !isFlowType ? definition || '' : '',
-        projectId:
-          !this.isGlobal && this.projectId
-            ? convertToGraphQLId(TYPENAME_PROJECT, this.projectId)
-            : this.initialValues.projectId,
-        visibilityLevel: this.initialValues.public
-          ? VISIBILITY_LEVEL_PUBLIC
-          : VISIBILITY_LEVEL_PRIVATE,
+        definitionFlow,
+        definitionThirdPartyFlow,
+        projectId,
+        visibilityLevel,
       },
       formErrors: [],
     };
@@ -258,7 +273,7 @@ export default {
       },
       groupAttrs: {
         labelDescription: s__(
-          'AICatalog|This YAML configuration file determines the prompts, tools, and capabilities of your flow. Required properties: version, environment, components, routers, flow, prompts.',
+          'AICatalog|This YAML configuration file determines the prompts, tools, and capabilities of your flow. Required properties: version, environment, components, prompts, routers, flow.',
         ),
       },
     },
diff --git a/ee/app/assets/javascripts/ai/catalog/constants.js b/ee/app/assets/javascripts/ai/catalog/constants.js
index 1ec5b76d6c670400ed3db531ea7ef71c72de4d98..0ccfd30bb75f1ec4412d0122f54ec60abcd0f06d 100644
--- a/ee/app/assets/javascripts/ai/catalog/constants.js
+++ b/ee/app/assets/javascripts/ai/catalog/constants.js
@@ -114,3 +114,82 @@ export const FLOW_TYPE_APOLLO_CONFIG = {
     },
   },
 };
+
+export const DEFAULT_FLOW_YML_STRING = `\
+# Schema version
+version: "v1"
+# Environment where the flow runs (ambient = GitLab's managed environment)
+environment: ambient
+
+# Components define the steps in your flow
+# Each component can be an Agent, DeterministicStep, or other component types
+components:
+  - name: "my_agent"
+    type: AgentComponent  # Options: AgentComponent, DeterministicStepComponent
+    prompt_id: "my_prompt"  # References a prompt defined below
+    inputs:
+      - "context:goal"  # Input from user or previous component
+    toolset: []  # Add tool names here: ["get_issue", "create_issue_note"]
+
+    # Optional: Add UI logging for debugging
+    # ui_log_events:
+    #   - "on_agent_final_answer"
+    #   - "on_tool_execution_success"
+
+# Define your prompts here
+# Each prompt configures an AI agent's behavior and model settings
+prompts:
+  - prompt_id: "my_prompt"  # Must match the prompt_id referenced above
+    name: "My Agent Prompt"
+    model:
+      params:
+        model_class_provider: anthropic  # Provider: anthropic, openai, etc.
+        model: claude-sonnet-4-20250514  # Model identifier
+        max_tokens: 8192  # Adjust based on expected response length
+
+    # System and user prompts define the agent's behavior
+    prompt_template:
+      system: |
+        You are GitLab Duo Chat, an agentic AI assistant.
+        Your role is to help users with their GitLab tasks.
+        Be concise, accurate, and actionable in your responses.
+
+        # Add specific instructions for your use case here
+
+      user: |
+        {{goal}}
+
+        # Available variables depend on your inputs:
+        # {{goal}} - The user's request
+        # {{context}} - Additional context from previous steps
+
+      placeholder: history  # Maintains conversation context
+
+    params:
+      timeout: 180  # Seconds before timeout
+
+# Routers define the flow between components
+# Use "end" as the final destination
+routers:
+  - from: "my_agent"
+    to: "end"
+
+  # Example: Multi-step flow
+  # - from: "fetch_data"
+  #   to: "process_data"
+  # - from: "process_data"
+  #   to: "my_agent"
+  # - from: "my_agent"
+  #   to: "end"
+
+# Define the entry point for your flow
+flow:
+  entry_point: "my_agent"
+`;
+
+export const DEFAULT_THIRD_PARTY_FLOW_YML_STRING = `\
+image: alpine:latest
+injectGatewayToken: true
+commands:
+  - echo "Hello, World!"
+`;
diff --git a/ee/spec/frontend/ai/catalog/components/ai_catalog_flow_form_spec.js b/ee/spec/frontend/ai/catalog/components/ai_catalog_flow_form_spec.js
index d767be11a516259fbb542cc25c2a456b631c4504..f9d9c6efdcf06aff2b44db9413cdf569eb814aa7 100644
--- a/ee/spec/frontend/ai/catalog/components/ai_catalog_flow_form_spec.js
+++ b/ee/spec/frontend/ai/catalog/components/ai_catalog_flow_form_spec.js
@@ -6,7 +6,12 @@ import FormFlowType from 'ee/ai/catalog/components/form_flow_type.vue';
 import FormProjectDropdown from 'ee/ai/catalog/components/form_project_dropdown.vue';
 import VisibilityLevelRadioGroup from 'ee/ai/catalog/components/visibility_level_radio_group.vue';
 import FormGroup from 'ee/ai/catalog/components/form_group.vue';
-import { VISIBILITY_LEVEL_PRIVATE, VISIBILITY_LEVEL_PUBLIC } from 'ee/ai/catalog/constants';
+import {
+  VISIBILITY_LEVEL_PRIVATE,
+  VISIBILITY_LEVEL_PUBLIC,
+  DEFAULT_FLOW_YML_STRING,
+  DEFAULT_THIRD_PARTY_FLOW_YML_STRING,
+} from 'ee/ai/catalog/constants';
 
 describe('AiCatalogFlowForm', () => {
   let wrapper;
@@ -94,7 +99,7 @@ describe('AiCatalogFlowForm', () => {
       expect(findDescriptionField().props('value')).toBe('');
       expect(findVisibilityLevelRadioGroup().props('initialValue')).toBe(false);
       expect(findVisibilityLevelRadioGroup().props('value')).toBe(VISIBILITY_LEVEL_PRIVATE);
-      expect(findDefinitionFlowField().props('value')).toBe('');
+      expect(findDefinitionFlowField().props('value')).toBe(DEFAULT_FLOW_YML_STRING);
       expect(findDefinitionThirdPartyFlowField().exists()).toBe(false);
     });
 
@@ -107,7 +112,7 @@ describe('AiCatalogFlowForm', () => {
       expect(findDescriptionField().props('value')).toBe('');
       expect(findVisibilityLevelRadioGroup().props('initialValue')).toBe(false);
       expect(findVisibilityLevelRadioGroup().props('value')).toBe(VISIBILITY_LEVEL_PRIVATE);
-      expect(findDefinitionFlowField().props('value')).toBe('');
+      expect(findDefinitionFlowField().props('value')).toBe(DEFAULT_FLOW_YML_STRING);
       expect(findDefinitionThirdPartyFlowField().exists()).toBe(false);
     });
 
@@ -159,6 +164,22 @@ describe('AiCatalogFlowForm', () => {
         expect(findDefinitionThirdPartyFlowField().props('value')).toBe('third-party-definition');
         expect(findDefinitionFlowField().exists()).toBe(false);
       });
+
+      it('renders default value when there was no definition set', () => {
+        createWrapper({
+          props: {
+            initialValues: {
+              ...initialValues,
+              definition: '',
+              type: 'THIRD_PARTY_FLOW',
+            },
+          },
+        });
+
+        expect(findDefinitionThirdPartyFlowField().props('value')).toBe(
+          DEFAULT_THIRD_PARTY_FLOW_YML_STRING,
+        );
+      });
     });
   });
 
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index 85d3182e4cdf6c34561ea521a9dd3b38ce198bee..f91faf1ddee2988697dd951374960f53e7fc08cf 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -2853,7 +2853,7 @@ msgstr ""
 msgid "AICatalog|This YAML configuration file determines the prompts, tools, and capabilities of your flow. Required properties: injectGatewayToken, image, commands"
 msgstr ""
 
-msgid "AICatalog|This YAML configuration file determines the prompts, tools, and capabilities of your flow. Required properties: version, environment, components, routers, flow, prompts."
+msgid "AICatalog|This YAML configuration file determines the prompts, tools, and capabilities of your flow. Required properties: version, environment, components, prompts, routers, flow."
 msgstr ""
 
 msgid "AICatalog|This agent can be made private if it is not used."