diff --git a/tests/cloud/test_harness_app_contract.py b/tests/cloud/test_harness_app_contract.py
index 6719c5cd..7d70109f 100644
--- a/tests/cloud/test_harness_app_contract.py
+++ b/tests/cloud/test_harness_app_contract.py
@@ -34,7 +34,11 @@
     RunAgentRequest,
 )
 from veadk.cloud.harness_app.env_mapping import to_runtime_env
-from veadk.cloud.harness_app.utils import config_from_env, split_csv
+from veadk.cloud.harness_app.utils import (
+    agent_name_from_harness,
+    config_from_env,
+    split_csv,
+)
 from veadk.consts import DEFAULT_MODEL_AGENT_NAME
 from veadk.prompts.agent_default_prompt import DEFAULT_INSTRUCTION
 
@@ -91,6 +95,7 @@ def test_extends_overrides(self):
     def test_adds_creation_time_fields(self):
         assert set(_fields(HarnessConfig)) == set(_fields(HarnessOverrides)) | {
             "app_name",
+            "description",
             "knowledgebase_type",
             "longterm_memory_type",
             "shortterm_memory_type",
@@ -232,3 +237,26 @@ def test_empty_string_is_empty_list(self):
 
     def test_drops_blank_segments(self):
         assert split_csv("a,,  ,b") == ["a", "b"]
+
+
+class TestAgentNameFromHarness:
+    """The agent name (and thus the A2A card name) is derived from the harness
+    name, normalized to a valid ADK identifier."""
+
+    def test_identifier_passes_through(self):
+        assert agent_name_from_harness("harness_app") == "harness_app"
+
+    def test_hyphens_become_underscores(self):
+        assert agent_name_from_harness("oauth-test") == "oauth_test"
+
+    def test_leading_digit_is_prefixed(self):
+        assert agent_name_from_harness("2048-bot") == "_2048_bot"
+
+    def test_reserved_user_is_escaped(self):
+        assert agent_name_from_harness("user") == "user_"
+
+    def test_result_is_always_a_valid_identifier(self):
+        for raw in ["oauth-test", "2048-bot", "user", "a.b c", ""]:
+            name = agent_name_from_harness(raw)
+            assert name.isidentifier(), raw
+            assert name != "user"
diff --git a/veadk/cloud/harness_app/agent.py b/veadk/cloud/harness_app/agent.py
index 7d4ed9f7..669976de 100644
--- a/veadk/cloud/harness_app/agent.py
+++ b/veadk/cloud/harness_app/agent.py
@@ -22,6 +22,7 @@
 Environment variables:
     MODEL_NAME              Reasoning model name. Default: VeADK default model.
     SYSTEM_PROMPT           Agent instruction. Default: VeADK default instruction.
+    DESCRIPTION             Agent description (e.g. for A2A discovery). Default: VeADK default description.
     TOOLS                   Comma-separated built-in tool names, e.g. "web_search,link_reader".
     SKILLS                  Comma-separated skill names, e.g. "data-visualization-cloud,...".
     RUNTIME                 Agent runtime backend: "adk" (default) or "codex".
diff --git a/veadk/cloud/harness_app/types.py b/veadk/cloud/harness_app/types.py
index a310aec5..dd36cec0 100644
--- a/veadk/cloud/harness_app/types.py
+++ b/veadk/cloud/harness_app/types.py
@@ -30,7 +30,7 @@
 from pydantic import BaseModel, Field
 
 from veadk.consts import DEFAULT_MODEL_AGENT_NAME
-from veadk.prompts.agent_default_prompt import DEFAULT_INSTRUCTION
+from veadk.prompts.agent_default_prompt import DEFAULT_DESCRIPTION, DEFAULT_INSTRUCTION
 
 
 class HarnessOverrides(BaseModel):
@@ -82,6 +82,7 @@ class HarnessConfig(HarnessOverrides):
 
     app_name: str = Field(default="harness_app", alias="name")
     system_prompt: str = Field(default=DEFAULT_INSTRUCTION)
+    description: str = Field(default=DEFAULT_DESCRIPTION)
     knowledgebase_type: str = Field(default="")
     longterm_memory_type: str = Field(default="")
     shortterm_memory_type: str = Field(default="local")
diff --git a/veadk/cloud/harness_app/utils.py b/veadk/cloud/harness_app/utils.py
index e4674e30..7fb42e5e 100644
--- a/veadk/cloud/harness_app/utils.py
+++ b/veadk/cloud/harness_app/utils.py
@@ -27,6 +27,7 @@
 
 import io
 import os
+import re
 import shutil
 import tempfile
 import zipfile
@@ -66,6 +67,7 @@
     "HarnessConfig",
     "HarnessOverrides",
     "split_csv",
+    "agent_name_from_harness",
     "build_skill_toolset",
     "SkillLoadError",
     "ToolLoadError",
@@ -111,6 +113,7 @@ def _load_builtin_tool(name: str) -> Any:
     "tools": "TOOLS",
     "skills": "SKILLS",
     "system_prompt": "SYSTEM_PROMPT",
+    "description": "DESCRIPTION",
     "runtime": "RUNTIME",
     "structured_tool_calls": "STRUCTURED_TOOL_CALLS",
     "include_tools_every_turn": "INCLUDE_TOOLS_EVERY_TURN",
@@ -139,6 +142,24 @@ def split_csv(value: str) -> list[str]:
     return [item.strip() for item in value.split(",") if item.strip()]
 
 
+def agent_name_from_harness(harness_name: str) -> str:
+    """Derive a valid ADK agent name from the harness name.
+
+    The agent name becomes the A2A agent card's ``name``, so it should reflect
+    the harness rather than a shared constant. ADK requires the agent ``name``
+    to be a Python identifier (letters, digits, underscores; not starting with a
+    digit) and forbids ``"user"``, while harness names also allow ``-`` and may
+    start with a digit. Normalize: map every non-identifier char to ``_`` and
+    prefix a digit-leading or empty name with ``_``.
+
+    ``"oauth-test"`` -> ``"oauth_test"``; ``"2048-bot"`` -> ``"_2048_bot"``.
+    """
+    name = re.sub(r"[^0-9A-Za-z_]", "_", harness_name or "")
+    if not name or name[0].isdigit():
+        name = f"_{name}"
+    return f"{name}_" if name == "user" else name
+
+
 def _download_and_extract_skill(skill: str, dest_dir: Path) -> Path:
     """Download a skill zip from the skill hub and extract it.
 
@@ -315,9 +336,10 @@ def _assemble_agent(config: HarnessConfig) -> tuple[Agent, ShortTermMemory]:
     )
 
     agent = Agent(
-        name="harness_agent",
+        name=agent_name_from_harness(config.app_name),
         model_name=config.model_name,
         instruction=config.system_prompt,
+        description=config.description,
         tools=tools,
         runtime=config.runtime,
         enable_responses=config.structured_tool_calls,