feature: add A2A Protocol Client Support

packages/agentflow/src/core/node-config/nodeIcons.ts

@@ -13,6 +13,7 @@ import {
     IconPlayerPlayFilled,
     IconRelationOneToManyFilled,
     IconRepeat,
+    IconReplace,
     IconReplaceUser,
     IconRobot,
     IconSparkles,
@@ -109,6 +110,11 @@ export const AGENTFLOW_ICONS: AgentflowIcon[] = [
         name: 'executeFlowAgentflow',
         icon: IconVectorBezier2,
         color: tokens.colors.nodes.executeFlow
+    },
+    {
+        name: 'a2aRemoteAgentAgentflow',
+        icon: IconReplace,
+        color: tokens.colors.nodes.a2aRemoteAgent
     }
 ]
 
@@ -130,5 +136,6 @@ export const DEFAULT_AGENTFLOW_NODES = [
     'stickyNoteAgentflow',
     'httpAgentflow',
     'iterationAgentflow',
-    'executeFlowAgentflow'
+    'executeFlowAgentflow',
+    'a2aRemoteAgentAgentflow'
 ]

packages/agentflow/src/core/theme/tokens.ts

@@ -101,6 +101,7 @@ const baseColors = {
     nodeHttp: '#FF7F7F',
     nodeIteration: '#9C89B8',
     nodeExecuteFlow: '#a3b18a',
+    nodeA2aRemoteAgent: '#83C5BE',
 
     // Gradient colors
     gradientOrange: '#FF6B6B',
@@ -125,7 +126,8 @@ export const tokens = {
             stickyNote: baseColors.nodeStickyNote,
             http: baseColors.nodeHttp,
             iteration: baseColors.nodeIteration,
-            executeFlow: baseColors.nodeExecuteFlow
+            executeFlow: baseColors.nodeExecuteFlow,
+            a2aRemoteAgent: baseColors.nodeA2aRemoteAgent
         },
 
         // Semantic UI colors - referenced from base

packages/components/credentials/A2AAgent.credential.ts

@@ -0,0 +1,57 @@
+import { INodeParams, INodeCredential } from '../src/Interface'
+
+class A2AAgentCredential implements INodeCredential {
+    label: string
+    name: string
+    version: number
+    description: string
+    inputs: INodeParams[]
+
+    constructor() {
+        this.label = 'A2A Agent'
+        this.name = 'a2aAgentCredential'
+        this.version = 1.0
+        this.description = 'Authenticate with a remote A2A protocol agent'
+        this.inputs = [
+            {
+                label: 'Auth Type',
+                name: 'authType',
+                type: 'options',
+                options: [
+                    {
+                        label: 'API Key',
+                        name: 'apiKey'
+                    },
+                    {
+                        label: 'Bearer Token',
+                        name: 'bearer'
+                    }
+                ]
+            },
+            {
+                label: 'API Key',
+                name: 'apiKey',
+                type: 'password',
+                description: 'API key for the remote A2A agent (used when Auth Type is API Key)',
+                optional: true
+            },
+            {
+                label: 'API Key Header Name',
+                name: 'apiKeyHeaderName',
+                type: 'string',
+                default: 'X-API-Key',
+                description: 'HTTP header name to send the API key in',
+                optional: true
+            },
+            {
+                label: 'Bearer Token',
+                name: 'bearerToken',
+                type: 'password',
+                description: 'Bearer token for the remote A2A agent (used when Auth Type is Bearer Token)',
+                optional: true
+            }
+        ]
+    }
+}
+
+module.exports = { credClass: A2AAgentCredential }