A2A remote agent client does not load description from agent card on start up

[vadakattu]

Describe the bug
Cold-start problem with remote agent descriptions via the RemoteA2aAgent client in google/adk/agents/remote_a2a_agent.py

1. If you don't supply a description to the remote agent client, then until your messages to the root agent happen to invoke the remote agent, the description will remain empty, relying on the agent name or system instruction alone for delegation to that remote agent. At that point, the description should be loaded by _ensure_resolved

2. If you do provide a description, then you won't have a cold-start delegation risk, however then as a developer consuming a remote agent, you will permanently override any agent-card description because L299 checking for a blank description will evaluate False, thereby ignoring the agent-card's description

Expected behavior
As with the MCP tool discovery, the remote agent-card should be looked up before communication/task delegation to a remote agent.

[vadakattu]

It also appears that remote agent-card skills and examples are not retrieved and passed to the consuming agent.

[rajib76]

I am suggesting a change as below

Fix 1: Description Cold-Start Bug
Problem: Agent descriptions weren't properly loaded from agent-cards, causing delegation issues.

remote_a2a_agent.py

Change from conditional update to always preferring agent-card:

# Before: Only if description was empty
if self._agent_card and self._agent_card.description:
    self.description = self._agent_card.description
# After: Agent-card is source of truth
if self._agent_card:
    enhanced_description = self._build_enhanced_description(self._agent_card)
    if enhanced_description:
        self.description = enhanced_description

Fix 2: Skills and Examples Enhancement
Problem: Agent-card ,skills and examples fields weren't utilized for delegation context.

remote_a2a_agent.py

Add new _build_enhanced_description method:

def _build_enhanced_description(self, agent_card: AgentCard) -> str:
    """Build enhanced description including skills and examples."""
    parts = []
    
    if agent_card.description:
        parts.append(agent_card.description)
    else:
        return ""  # Preserve user description if no agent-card description
    
    # Add skills with examples
    if agent_card.skills:
        parts.append("\\n\\nCapabilities:")
        for skill in agent_card.skills:
            skill_line = f"\\n- {skill.name}"
            if skill.description:
                skill_line += f": {skill.description}"
            if skill.tags:
                skill_line += f" [{', '.join(skill.tags)}]"
            parts.append(skill_line)
            
            # Add up to 2 examples per skill
            if skill.examples:
                for i, example in enumerate(skill.examples[:2]):
                    parts.append(f"\\n  Example {i + 1}: {example}")
    
    return "".join(parts)

[vadakattu]

@rajib76 Is the 2 example limit encouraged/supported by the protocol standard?

I would naively assume that all specified examples would warrant inclusion otherwise.