Add real-time session event monitoring to execution screen

[Copilot]

Exposes Copilot SDK session events (tool executions, progress updates, token usage, errors) to users during task execution via a toggleable event log.

Implementation

Event capture & forwarding

• copilot.ts: Subscribe to all session events via session.on(), added SessionEventData interface and optional callback to StreamCallbacks
• executor.ts: Forward events with task context through onSessionEvent callback
• Event flow: SDK → copilot → executor → UI, enriched with taskId at executor layer

UI & display

• execute.tsx: Added event log panel (toggle with e key), displays last 8 of max 100 events with timestamps
• formatSessionEvent() parses SDK event types into user-friendly messages
• Error events highlighted in red

Event types handled

• tool.execution_start / tool.execution_complete - tool lifecycle
• tool.execution_progress - real-time progress messages
• session.error - session-level failures
• assistant.usage - token consumption metrics

Example

// copilot.ts - event subscription
session.on((event) => {
  callbacks.onSessionEvent?.({
    type: event.type,
    timestamp: event.timestamp,
    data: event.data,
  });
});

// executor.ts - enrich with task context
onSessionEvent: (event) => {
  callbacks.onSessionEvent!(taskId, event);
}

Bounded to 100 events to prevent unbounded memory growth during long-running executions.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[enhancement] Add Real-Time Session Event Monitoring for Task Execution Feedback</issue_title>
<issue_description>## Background

Recent changes in the Copilot SDK (v0.1.24-preview.0) include:

• Event naming improvements: The SDK renamed tool.execution_end to tool.execution_complete for clarity (PR colindembovsky/planeteer#385 by Andrew Yoon, merged Feb 6, 2026)
• Session event handling: Enhanced session event subscription mechanisms with better reliability (PR colindembovsky/planeteer#24 by nathfavour)
• Forward compatibility tests: New tests verify handling of unknown session event types (PR colindembovsky/planeteer#35)
• CLI update: @github/copilot upgraded to 0.0.405 (PR colindembovsky/planeteer#396 by Devraj Mehta, merged Feb 7, 2026)

Commit reference: 439e0f0

Proposal

Implement real-time session event monitoring in src/services/executor.ts to provide users with granular feedback during task execution. The SDK's session event API allows subscriptions to events like:

• tool.execution_complete (formerly tool.execution_end)
• Progress updates from Copilot agents
• Token usage and performance metrics

Implementation approach:

1. Add event listeners in the Copilot SDK wrapper (src/services/copilot.ts)
2. Stream events to the execution screen component (src/screens/execute.tsx)
3. Display real-time progress indicators for each task (e.g., "Installing dependencies...", "Running tests...", "Generating code...")
4. Show estimated completion percentages based on event data

Benefit

• Better UX: Users see what Copilot is actively doing instead of staring at a blank "In Progress" spinner
• Debugging: When tasks fail, users can see exactly where execution stopped
• Transparency: Token usage and performance data help users understand costs
• Trust: Real-time feedback builds confidence that the system is working

Acceptance Criteria

• Session event subscription implemented in src/services/copilot.ts using SDK's event API
• Event stream plumbed to src/screens/execute.tsx (via React state or context)
• Execution screen displays at least 3 types of events: task start, progress updates, and tool.execution_complete
• Event log is scrollable and shows timestamps
• Error events are highlighted in red and include actionable messages
• Unit tests verify event handlers properly parse SDK event payloads
• Documentation updated to explain the event monitoring feature

AI generated by Weekly Enhancement Suggestions

Comments on the Issue (you are @copilot in this section)

• Fixes [enhancement] Add Real-Time Session Event Monitoring for Task Execution Feedback #9

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