fix: generateRequestConfirmationEvent creates events with empty ID

[dannovikov]

Closes #587

Description:

generateRequestConfirmationEvent in internal/llminternal/functions.go constructs the confirmation event using a raw &session.Event{...} struct literal, which leaves the ID field as "". In the Python ADK, Event.model_post_init auto-assigns a UUID on every construction. The Go equivalent is session.NewEvent(), which assigns uuid.NewString().

The fix replaces the raw struct literal with session.NewEvent(), which also handles Timestamp and StateDelta initialisation — making the explicit time.Now() and Actions: session.EventActions{} unnecessary.

Go (internal/llminternal/functions.go:81):

// Before:
return &session.Event{
    InvocationID: invocationContext.InvocationID(),
    Author:       invocationContext.Agent().Name(),
    ...
    Timestamp:    time.Now(),
    Actions:      session.EventActions{},
}

// After:
ev := session.NewEvent(invocationContext.InvocationID())
ev.Author = invocationContext.Agent().Name()
...

Python (src/google/adk/events/event.py:69-71):

def model_post_init(self, __context):
    if not self.id:
        self.id = Event.new_id()   # str(uuid.uuid4())

Testing:

Added TestGenerateRequestConfirmationEventHasID to functions_test.go which:

• Constructs a valid confirmation scenario (matching function call + confirmation request)
• Asserts got.ID != "" — fails before the fix, passes after
• Asserts got.InvocationID == "inv_1" for correctness

Updated the existing TestGenerateRequestConfirmationEvent expected wantEvent to include StateDelta: map[string]any{} (initialised by NewEvent).

[gemini-code-assist]

Summary of Changes

Hello @dannovikov, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a critical bug in the Go ADK where events generated by generateRequestConfirmationEvent were missing IDs. This was due to the direct instantiation of the session.Event struct, bypassing the automatic UUID assignment. The fix replaces the struct literal with session.NewEvent(), ensuring that all events have a unique ID, which is crucial for features like time-travel and session lookup. Additionally, a new test case has been added to prevent regressions.

Highlights

• Fix for Empty Event IDs: This PR addresses an issue where generateRequestConfirmationEvent was creating events with empty IDs due to using a raw struct literal instead of session.NewEvent().
• Go ADK Event Creation: The PR updates the Go ADK to align with the Python ADK by ensuring that events are created with session.NewEvent() to automatically assign UUIDs.
• Testing: A new test case, TestGenerateRequestConfirmationEventHasID, was added to verify that events generated by generateRequestConfirmationEvent always have a non-empty ID.

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Changelog

• internal/llminternal/functions.go
  • Replaced raw struct literal with session.NewEvent() to ensure events have a UUID.
• internal/llminternal/functions_test.go
  • Added TestGenerateRequestConfirmationEventHasID to verify that events have non-empty IDs.
  • Updated TestGenerateRequestConfirmationEvent to include StateDelta in the expected event.

Activity

• The PR addresses issue generateRequestConfirmationEvent creates events with empty ID #587.
• The PR includes a new test case to prevent regressions.
• The changes align the Go ADK with the Python ADK in terms of event ID generation.

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[gemini-code-assist]

Code Review

This pull request correctly addresses a bug where generateRequestConfirmationEvent created events with an empty ID. The fix properly uses the session.NewEvent() factory function, which ensures a unique ID is always assigned. This change also simplifies the event creation logic by leveraging the initialization of Timestamp and StateDelta done by NewEvent(). The accompanying changes in the tests are well-written: the existing test is correctly updated to reflect the new event structure, and a new test is added to specifically verify that the generated event has a non-empty ID, preventing future regressions. The changes are solid and improve the robustness of the code.