diff --git a/src/assets/__tests__/__snapshots__/assets.snapshot.test.ts.snap b/src/assets/__tests__/__snapshots__/assets.snapshot.test.ts.snap
index b314e8da2..f1223e0f2 100644
--- a/src/assets/__tests__/__snapshots__/assets.snapshot.test.ts.snap
+++ b/src/assets/__tests__/__snapshots__/assets.snapshot.test.ts.snap
@@ -1311,7 +1311,7 @@ from google.adk.agents import Agent
 from google.adk.a2a.executor.a2a_agent_executor import A2aAgentExecutor
 from google.adk.runners import Runner
 from google.adk.sessions import InMemorySessionService
-from a2a.types import AgentCapabilities, AgentCard, AgentSkill
+from a2a.types import AgentCapabilities, AgentCard, AgentInterface, AgentSkill
 from bedrock_agentcore.runtime import serve_a2a
 from model.load import load_model
 
@@ -1405,7 +1405,6 @@ runner = Runner(
 card = AgentCard(
     name=agent.name,
     description=agent.description,
-    url="http://localhost:9000/",
     version="0.1.0",
     capabilities=AgentCapabilities(streaming=True),
     skills=[
@@ -1418,6 +1417,13 @@ card = AgentCard(
     ],
     default_input_modes=["text"],
     default_output_modes=["text"],
+    supported_interfaces=[
+        AgentInterface(
+            protocol_binding="JSONRPC",
+            protocol_version="1.0",
+            url="http://localhost:9000/",
+        )
+    ],
 )
 
 if __name__ == "__main__":
@@ -1487,11 +1493,11 @@ description = "AgentCore A2A Agent using Google ADK"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-    "a2a-sdk >= 0.2.0, < 1.0.0",
+    "a2a-sdk[http-server] >= 1.0.1, < 2.0.0",
     "aws-opentelemetry-distro",
-    "bedrock-agentcore[a2a] >= 1.0.3",
-    "google-adk >= 1.0.0, < 2.0.0",
-    "google-genai >= 1.0.0, < 2.0.0",
+    "bedrock-agentcore[a2a-v1] >= 1.19.0",
+    "google-adk[a2a] >= 2.5.0, < 3.0.0",
+    "google-genai >= 2.9.0, < 3.0.0",
     # 1.13.0 was yanked for broken imports.
     "opentelemetry-resourcedetector-gcp >= 1.9.0a0, < 2.0.0, != 1.13.0",
 ]
@@ -1579,11 +1585,11 @@ import os
 from langchain_core.tools import tool
 from langgraph.prebuilt import create_react_agent
 from opentelemetry.instrumentation.langchain import LangchainInstrumentor
+from a2a.helpers import new_task_from_user_message
 from a2a.server.agent_execution import AgentExecutor, RequestContext
 from a2a.server.events import EventQueue
 from a2a.server.tasks import TaskUpdater
-from a2a.types import AgentCapabilities, AgentCard, AgentSkill, Part, TextPart
-from a2a.utils import new_task
+from a2a.types import AgentCapabilities, AgentCard, AgentInterface, AgentSkill, Part
 from bedrock_agentcore.runtime import serve_a2a
 from model.load import load_model
 
@@ -1675,7 +1681,7 @@ class LangGraphA2AExecutor(AgentExecutor):
         self.graph = graph
 
     async def execute(self, context: RequestContext, event_queue: EventQueue) -> None:
-        task = context.current_task or new_task(context.message)
+        task = context.current_task or new_task_from_user_message(context.message)
         if not context.current_task:
             await event_queue.enqueue_event(task)
         updater = TaskUpdater(event_queue, task.id, task.context_id)
@@ -1684,7 +1690,7 @@ class LangGraphA2AExecutor(AgentExecutor):
         result = await self.graph.ainvoke({"messages": [("user", user_text)]})
         response = result["messages"][-1].content
 
-        await updater.add_artifact([Part(root=TextPart(text=response))])
+        await updater.add_artifact([Part(text=response)])
         await updater.complete()
 
     async def cancel(self, context: RequestContext, event_queue: EventQueue) -> None:
@@ -1694,7 +1700,6 @@ class LangGraphA2AExecutor(AgentExecutor):
 card = AgentCard(
     name="{{ name }}",
     description="A LangGraph agent on Bedrock AgentCore",
-    url="http://localhost:9000/",
     version="0.1.0",
     capabilities=AgentCapabilities(streaming=True),
     skills=[
@@ -1707,6 +1712,13 @@ card = AgentCard(
     ],
     default_input_modes=["text"],
     default_output_modes=["text"],
+    supported_interfaces=[
+        AgentInterface(
+            protocol_binding="JSONRPC",
+            protocol_version="1.0",
+            url="http://localhost:9000/",
+        )
+    ],
 )
 
 if __name__ == "__main__":
@@ -1858,7 +1870,7 @@ description = "AgentCore A2A Agent using LangChain + LangGraph"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-    "a2a-sdk >= 0.2.0, < 1.0.0",
+    "a2a-sdk[http-server] >= 1.0.1, < 2.0.0",
     {{#if (eq modelProvider "Anthropic")}}"langchain-anthropic >= 0.3.0",
     {{/if}}{{#if (eq modelProvider "Bedrock")}}"langchain-aws >= 0.2.0",
     {{/if}}{{#if (eq modelProvider "Gemini")}}"langchain-google-genai >= 2.0.0",
@@ -1866,7 +1878,7 @@ dependencies = [
     {{/if}}{{#if (eq modelProvider "OpenAI")}}"langchain-openai >= 0.2.0",
     {{/if}}"aws-opentelemetry-distro",
     "opentelemetry-instrumentation-langchain >= 0.59.0",
-    "bedrock-agentcore[a2a] >= 1.8.0",
+    "bedrock-agentcore[a2a-v1] >= 1.19.0",
     "botocore[crt] >= 1.35.0",
     "langgraph >= 0.2.0",
 ]
@@ -2209,7 +2221,7 @@ readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
     {{#if (eq modelProvider "Anthropic")}}"anthropic >= 0.30.0",
-    {{/if}}"a2a-sdk[all] >= 0.2.0, < 1.0.0",
+    {{/if}}"a2a-sdk[all] >= 0.3.0, < 0.4.0",
     "aws-opentelemetry-distro",
     "bedrock-agentcore[a2a] >= 1.9.1",
     "botocore[crt] >= 1.35.0",
diff --git a/src/assets/python/a2a/googleadk/base/main.py b/src/assets/python/a2a/googleadk/base/main.py
index 2714c5c90..8b439920b 100644
--- a/src/assets/python/a2a/googleadk/base/main.py
+++ b/src/assets/python/a2a/googleadk/base/main.py
@@ -5,7 +5,7 @@
 from google.adk.a2a.executor.a2a_agent_executor import A2aAgentExecutor
 from google.adk.runners import Runner
 from google.adk.sessions import InMemorySessionService
-from a2a.types import AgentCapabilities, AgentCard, AgentSkill
+from a2a.types import AgentCapabilities, AgentCard, AgentInterface, AgentSkill
 from bedrock_agentcore.runtime import serve_a2a
 from model.load import load_model
 
@@ -99,7 +99,6 @@ def list_files(path: str) -> str:
 card = AgentCard(
     name=agent.name,
     description=agent.description,
-    url="http://localhost:9000/",
     version="0.1.0",
     capabilities=AgentCapabilities(streaming=True),
     skills=[
@@ -112,6 +111,13 @@ def list_files(path: str) -> str:
     ],
     default_input_modes=["text"],
     default_output_modes=["text"],
+    supported_interfaces=[
+        AgentInterface(
+            protocol_binding="JSONRPC",
+            protocol_version="1.0",
+            url="http://localhost:9000/",
+        )
+    ],
 )
 
 if __name__ == "__main__":
diff --git a/src/assets/python/a2a/googleadk/base/pyproject.toml b/src/assets/python/a2a/googleadk/base/pyproject.toml
index 9bf385764..69dc659d5 100644
--- a/src/assets/python/a2a/googleadk/base/pyproject.toml
+++ b/src/assets/python/a2a/googleadk/base/pyproject.toml
@@ -9,11 +9,11 @@ description = "AgentCore A2A Agent using Google ADK"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-    "a2a-sdk >= 0.2.0, < 1.0.0",
+    "a2a-sdk[http-server] >= 1.0.1, < 2.0.0",
     "aws-opentelemetry-distro",
-    "bedrock-agentcore[a2a] >= 1.0.3",
-    "google-adk >= 1.0.0, < 2.0.0",
-    "google-genai >= 1.0.0, < 2.0.0",
+    "bedrock-agentcore[a2a-v1] >= 1.19.0",
+    "google-adk[a2a] >= 2.5.0, < 3.0.0",
+    "google-genai >= 2.9.0, < 3.0.0",
     # 1.13.0 was yanked for broken imports.
     "opentelemetry-resourcedetector-gcp >= 1.9.0a0, < 2.0.0, != 1.13.0",
 ]
diff --git a/src/assets/python/a2a/langchain_langgraph/base/main.py b/src/assets/python/a2a/langchain_langgraph/base/main.py
index 2ab8f6ff8..5960203a4 100644
--- a/src/assets/python/a2a/langchain_langgraph/base/main.py
+++ b/src/assets/python/a2a/langchain_langgraph/base/main.py
@@ -4,11 +4,11 @@
 from langchain_core.tools import tool
 from langgraph.prebuilt import create_react_agent
 from opentelemetry.instrumentation.langchain import LangchainInstrumentor
+from a2a.helpers import new_task_from_user_message
 from a2a.server.agent_execution import AgentExecutor, RequestContext
 from a2a.server.events import EventQueue
 from a2a.server.tasks import TaskUpdater
-from a2a.types import AgentCapabilities, AgentCard, AgentSkill, Part, TextPart
-from a2a.utils import new_task
+from a2a.types import AgentCapabilities, AgentCard, AgentInterface, AgentSkill, Part
 from bedrock_agentcore.runtime import serve_a2a
 from model.load import load_model
 
@@ -100,7 +100,7 @@ def __init__(self, graph):
         self.graph = graph
 
     async def execute(self, context: RequestContext, event_queue: EventQueue) -> None:
-        task = context.current_task or new_task(context.message)
+        task = context.current_task or new_task_from_user_message(context.message)
         if not context.current_task:
             await event_queue.enqueue_event(task)
         updater = TaskUpdater(event_queue, task.id, task.context_id)
@@ -109,7 +109,7 @@ async def execute(self, context: RequestContext, event_queue: EventQueue) -> Non
         result = await self.graph.ainvoke({"messages": [("user", user_text)]})
         response = result["messages"][-1].content
 
-        await updater.add_artifact([Part(root=TextPart(text=response))])
+        await updater.add_artifact([Part(text=response)])
         await updater.complete()
 
     async def cancel(self, context: RequestContext, event_queue: EventQueue) -> None:
@@ -119,7 +119,6 @@ async def cancel(self, context: RequestContext, event_queue: EventQueue) -> None
 card = AgentCard(
     name="{{ name }}",
     description="A LangGraph agent on Bedrock AgentCore",
-    url="http://localhost:9000/",
     version="0.1.0",
     capabilities=AgentCapabilities(streaming=True),
     skills=[
@@ -132,6 +131,13 @@ async def cancel(self, context: RequestContext, event_queue: EventQueue) -> None
     ],
     default_input_modes=["text"],
     default_output_modes=["text"],
+    supported_interfaces=[
+        AgentInterface(
+            protocol_binding="JSONRPC",
+            protocol_version="1.0",
+            url="http://localhost:9000/",
+        )
+    ],
 )
 
 if __name__ == "__main__":
diff --git a/src/assets/python/a2a/langchain_langgraph/base/pyproject.toml b/src/assets/python/a2a/langchain_langgraph/base/pyproject.toml
index e67af7505..4b2627483 100644
--- a/src/assets/python/a2a/langchain_langgraph/base/pyproject.toml
+++ b/src/assets/python/a2a/langchain_langgraph/base/pyproject.toml
@@ -9,7 +9,7 @@ description = "AgentCore A2A Agent using LangChain + LangGraph"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-    "a2a-sdk >= 0.2.0, < 1.0.0",
+    "a2a-sdk[http-server] >= 1.0.1, < 2.0.0",
     {{#if (eq modelProvider "Anthropic")}}"langchain-anthropic >= 0.3.0",
     {{/if}}{{#if (eq modelProvider "Bedrock")}}"langchain-aws >= 0.2.0",
     {{/if}}{{#if (eq modelProvider "Gemini")}}"langchain-google-genai >= 2.0.0",
@@ -17,7 +17,7 @@ dependencies = [
     {{/if}}{{#if (eq modelProvider "OpenAI")}}"langchain-openai >= 0.2.0",
     {{/if}}"aws-opentelemetry-distro",
     "opentelemetry-instrumentation-langchain >= 0.59.0",
-    "bedrock-agentcore[a2a] >= 1.8.0",
+    "bedrock-agentcore[a2a-v1] >= 1.19.0",
     "botocore[crt] >= 1.35.0",
     "langgraph >= 0.2.0",
 ]
diff --git a/src/assets/python/a2a/strands/base/pyproject.toml b/src/assets/python/a2a/strands/base/pyproject.toml
index fc69f0030..a67fd7dc3 100644
--- a/src/assets/python/a2a/strands/base/pyproject.toml
+++ b/src/assets/python/a2a/strands/base/pyproject.toml
@@ -10,7 +10,7 @@ readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
     {{#if (eq modelProvider "Anthropic")}}"anthropic >= 0.30.0",
-    {{/if}}"a2a-sdk[all] >= 0.2.0, < 1.0.0",
+    {{/if}}"a2a-sdk[all] >= 0.3.0, < 0.4.0",
     "aws-opentelemetry-distro",
     "bedrock-agentcore[a2a] >= 1.9.1",
     "botocore[crt] >= 1.35.0",
diff --git a/src/cli/operations/dev/__tests__/invoke-a2a.test.ts b/src/cli/operations/dev/__tests__/invoke-a2a.test.ts
index e390af6c3..a01210fa5 100644
--- a/src/cli/operations/dev/__tests__/invoke-a2a.test.ts
+++ b/src/cli/operations/dev/__tests__/invoke-a2a.test.ts
@@ -1,5 +1,5 @@
 import { DevServerError } from '../../../../lib/errors/types';
-import { invokeA2AStreaming } from '../invoke-a2a';
+import { fetchA2AAgentCard, invokeA2AStreaming } from '../invoke-a2a';
 import { beforeEach, describe, expect, it, vi } from 'vitest';
 
 const mockFetch = vi.fn();
@@ -210,3 +210,35 @@ describe('invokeA2AStreaming', () => {
     expect(chunks.length).toBeGreaterThan(0);
   });
 });
+
+describe('fetchA2AAgentCard', () => {
+  beforeEach(() => {
+    mockFetch.mockReset();
+  });
+
+  it('uses the v1 agent card endpoint', async () => {
+    mockFetch.mockResolvedValueOnce({
+      ok: true,
+      status: 200,
+      json: () => Promise.resolve({ name: 'v1-agent' }),
+    });
+
+    const card = await fetchA2AAgentCard(9000);
+
+    expect(card?.name).toBe('v1-agent');
+    expect(mockFetch.mock.calls[0]![0]).toBe('http://localhost:9000/.well-known/agent-card.json');
+  });
+
+  it('falls back to the v0.3 agent card endpoint', async () => {
+    mockFetch.mockResolvedValueOnce({ ok: false, status: 404 }).mockResolvedValueOnce({
+      ok: true,
+      status: 200,
+      json: () => Promise.resolve({ name: 'legacy-agent' }),
+    });
+
+    const card = await fetchA2AAgentCard(9000);
+
+    expect(card?.name).toBe('legacy-agent');
+    expect(mockFetch.mock.calls[1]![0]).toBe('http://localhost:9000/.well-known/agent.json');
+  });
+});
diff --git a/src/cli/operations/dev/invoke-a2a.ts b/src/cli/operations/dev/invoke-a2a.ts
index 2491297c1..44189c059 100644
--- a/src/cli/operations/dev/invoke-a2a.ts
+++ b/src/cli/operations/dev/invoke-a2a.ts
@@ -10,6 +10,7 @@ export interface A2AAgentCard {
   description?: string;
   version?: string;
   url?: string;
+  supportedInterfaces?: { protocolBinding?: string; protocolVersion?: string; url?: string }[];
   skills?: { id?: string; name?: string; description?: string; tags?: string[] }[];
   capabilities?: { streaming?: boolean };
   defaultInputModes?: string[];
@@ -17,7 +18,7 @@ export interface A2AAgentCard {
 }
 
 /**
- * Fetch the A2A agent card from /.well-known/agent.json.
+ * Fetch the A2A agent card, falling back to the v0.3 endpoint.
  * Returns null if not available (retries on connection errors).
  */
 export async function fetchA2AAgentCard(port: number, logger?: SSELogger): Promise<A2AAgentCard | null> {
@@ -26,19 +27,22 @@ export async function fetchA2AAgentCard(port: number, logger?: SSELogger): Promi
 
   for (let attempt = 0; attempt < maxRetries; attempt++) {
     try {
-      const res = await fetch(`http://localhost:${port}/.well-known/agent.json`, {
-        method: 'GET',
-        headers: { Accept: 'application/json' },
-      });
+      for (const path of ['/.well-known/agent-card.json', '/.well-known/agent.json']) {
+        const res = await fetch(`http://localhost:${port}${path}`, {
+          method: 'GET',
+          headers: { Accept: 'application/json' },
+        });
+
+        if (!res.ok) {
+          if (res.status === 404 && path === '/.well-known/agent-card.json') continue;
+          logger?.log?.('warn', `Agent card not available (${res.status})`);
+          return null;
+        }
 
-      if (!res.ok) {
-        logger?.log?.('warn', `Agent card not available (${res.status})`);
-        return null;
+        const card = (await res.json()) as A2AAgentCard;
+        logger?.log?.('system', `A2A agent card: ${card.name ?? 'unnamed'}`);
+        return card;
       }
-
-      const card = (await res.json()) as A2AAgentCard;
-      logger?.log?.('system', `A2A agent card: ${card.name ?? 'unnamed'}`);
-      return card;
     } catch (err) {
       const error = err instanceof Error ? err : new Error(String(err));
       if (isConnectionError(error) && attempt < maxRetries - 1) {
diff --git a/src/cli/operations/dev/web-ui/__tests__/a2a-proxy.test.ts b/src/cli/operations/dev/web-ui/__tests__/a2a-proxy.test.ts
new file mode 100644
index 000000000..9cac9c402
--- /dev/null
+++ b/src/cli/operations/dev/web-ui/__tests__/a2a-proxy.test.ts
@@ -0,0 +1,81 @@
+import { handleA2AAgentCard } from '../handlers/a2a-proxy.js';
+import type { RouteContext } from '../handlers/route-context.js';
+import type { IncomingMessage, ServerResponse } from 'node:http';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+function mockReq(): IncomingMessage {
+  return {
+    url: '/api/a2a/agent-card?agentName=test-agent',
+    headers: { host: 'localhost:8081' },
+  } as unknown as IncomingMessage;
+}
+
+function mockRes(): ServerResponse & { _status: number; _body: string } {
+  const res = {
+    _status: 0,
+    _body: '',
+    writeHead(status: number) {
+      res._status = status;
+      return res;
+    },
+    setHeader: vi.fn(),
+    end(body?: string) {
+      if (body) res._body = body;
+    },
+  };
+  return res as unknown as ServerResponse & { _status: number; _body: string };
+}
+
+function mockCtx(): RouteContext {
+  return {
+    options: { mode: 'dev' },
+    runningAgents: new Map([['test-agent', { server: {} as never, port: 8082, protocol: 'A2A' }]]),
+    startingAgents: new Map(),
+    agentErrors: new Map(),
+    setCorsHeaders: vi.fn(),
+    readBody: vi.fn(),
+  } as unknown as RouteContext;
+}
+
+describe('handleA2AAgentCard', () => {
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it('uses the v1 agent card endpoint', async () => {
+    const fetchMock = vi.fn().mockResolvedValue({
+      ok: true,
+      status: 200,
+      json: () => Promise.resolve({ name: 'v1-agent' }),
+    });
+    vi.stubGlobal('fetch', fetchMock);
+    const res = mockRes();
+
+    await handleA2AAgentCard(mockCtx(), mockReq(), res);
+
+    expect(fetchMock).toHaveBeenCalledOnce();
+    expect(fetchMock.mock.calls[0]![0]).toBe('http://localhost:8082/.well-known/agent-card.json');
+    expect(res._status).toBe(200);
+    expect(JSON.parse(res._body)).toEqual({ success: true, card: { name: 'v1-agent' } });
+  });
+
+  it('falls back to the v0.3 agent card endpoint on 404', async () => {
+    const fetchMock = vi
+      .fn()
+      .mockResolvedValueOnce({ ok: false, status: 404 })
+      .mockResolvedValueOnce({
+        ok: true,
+        status: 200,
+        json: () => Promise.resolve({ name: 'legacy-agent' }),
+      });
+    vi.stubGlobal('fetch', fetchMock);
+    const res = mockRes();
+
+    await handleA2AAgentCard(mockCtx(), mockReq(), res);
+
+    expect(fetchMock).toHaveBeenCalledTimes(2);
+    expect(fetchMock.mock.calls[1]![0]).toBe('http://localhost:8082/.well-known/agent.json');
+    expect(res._status).toBe(200);
+    expect(JSON.parse(res._body)).toEqual({ success: true, card: { name: 'legacy-agent' } });
+  });
+});
diff --git a/src/cli/operations/dev/web-ui/api-types.ts b/src/cli/operations/dev/web-ui/api-types.ts
index b5ea2be12..672bb1583 100644
--- a/src/cli/operations/dev/web-ui/api-types.ts
+++ b/src/cli/operations/dev/web-ui/api-types.ts
@@ -420,12 +420,13 @@ export interface A2AAgentSkill {
   tags?: string[];
 }
 
-/** A2A agent card returned by /.well-known/agent.json */
+/** A2A agent card returned by /.well-known/agent-card.json */
 export interface A2AAgentCard {
   name?: string;
   description?: string;
   version?: string;
   url?: string;
+  supportedInterfaces?: { protocolBinding?: string; protocolVersion?: string; url?: string }[];
   skills?: A2AAgentSkill[];
   capabilities?: { streaming?: boolean };
   defaultInputModes?: string[];
diff --git a/src/cli/operations/dev/web-ui/handlers/a2a-proxy.ts b/src/cli/operations/dev/web-ui/handlers/a2a-proxy.ts
index 11d41852c..fc63eafeb 100644
--- a/src/cli/operations/dev/web-ui/handlers/a2a-proxy.ts
+++ b/src/cli/operations/dev/web-ui/handlers/a2a-proxy.ts
@@ -27,10 +27,16 @@ export async function handleA2AAgentCard(
   }
 
   try {
-    const cardRes = await fetch(`http://localhost:${running.port}/.well-known/agent.json`, {
+    let cardRes = await fetch(`http://localhost:${running.port}/.well-known/agent-card.json`, {
       method: 'GET',
       headers: { Accept: 'application/json' },
     });
+    if (cardRes.status === 404) {
+      cardRes = await fetch(`http://localhost:${running.port}/.well-known/agent.json`, {
+        method: 'GET',
+        headers: { Accept: 'application/json' },
+      });
+    }
 
     if (!cardRes.ok) {
       res.writeHead(502, { 'Content-Type': 'application/json' });