agent_card_builder doesn't use correct grammar #2223
Description
Describe the bug
When using to_a2a() the autogenerated AgentCard substitutes pronouns in the agent description without regard for grammar. In this example, the generated description is
Agent to give interesting facts. I are a helpful agent who can provide interesting facts.
It should be I am a helpful agent...
Code to Reproduce with version 1.8.0
from google.adk import Agent
from google.adk.a2a.utils.agent_to_a2a import to_a2a
from google.adk.tools import google_search
root_agent = Agent(
name='facts_agent',
model='gemini-2.5-flash-lite',
description=('Agent to give interesting facts.'),
instruction=('You are a helpful agent who can provide interesting facts.'),
tools=[google_search],
)
a2a_app = to_a2a(root_agent, port=8001)