Add gen_ai.caller.agent.type attribute for A2A tracing

[Copilot]

Ports Agent365-nodejs#187 to Python. Adds the gen_ai.caller.agent.type OpenTelemetry attribute to agent-to-agent invocation traces.

Changes

• trace_processor/util.py: Add GEN_AI_CALLER_AGENT_TYPE_KEY to INVOKE_AGENT_ATTRIBUTES
• invoke_agent_scope.py: Set agent_type span attribute from caller_agent_details
• test_invoke_agent_scope.py: Add test coverage for the new attribute

Usage

caller_agent = AgentDetails(
    agent_id="caller-123",
    agent_name="Orchestrator",
    agent_type=AgentType.DECLARATIVE_AGENT,  # Now recorded in traces
)

scope = InvokeAgentScope.start(
    invoke_agent_details=details,
    tenant_details=tenant,
    caller_agent_details=caller_agent,
)

The constant GEN_AI_CALLER_AGENT_TYPE_KEY was already defined in constants.py but wasn't being used.

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

• il-1234567812345678123456781234567.8.tenant.api.powerplatform.com
  • Triggering command: /home/REDACTED/work/Agent365-python/Agent365-python/.venv/bin/pytest pytest tests/observability/ -v --tb=short -m not integration (dns block)
• il-testtenan.t.tenant.api.powerplatform.com
  • Triggering command: /home/REDACTED/work/Agent365-python/Agent365-python/.venv/bin/pytest pytest tests/observability/ -v --tb=short -m not integration (dns block)

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[Copilot]

Pull request overview

This PR implements Python equivalents of changes from Node.js PR #187, adding support for tracking the gen_ai.caller.agent.type attribute in agent-to-agent invocation traces using OpenTelemetry.

Changes:

• Added GEN_AI_CALLER_AGENT_TYPE_KEY constant to the list of invoke agent attributes for trace processing
• Implemented agent type tag setting in the InvokeAgentScope to capture caller agent type during invocations
• Added comprehensive test coverage to verify the agent type attribute is properly set in telemetry spans

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
libraries/microsoft-agents-a365-observability-core/microsoft_agents_a365/observability/core/trace_processor/util.py	Added GEN_AI_CALLER_AGENT_TYPE_KEY to the INVOKE_AGENT_ATTRIBUTES list for trace processing
libraries/microsoft-agents-a365-observability-core/microsoft_agents_a365/observability/core/invoke_agent_scope.py	Imported the constant and added logic to set the agent type tag from caller agent details, following the existing pattern for enum value handling
tests/observability/core/test_invoke_agent_scope.py	Added new test method and updated test fixture with agent type to verify the attribute is correctly captured in telemetry spans