DEV-692: Utility Endpoint to get_context

[devin-ai-integration]

DEV-692: Utility Endpoint to get_context

This PR implements a new utility endpoint at /apps/{app_id}/users/{user_id}/sessions/{session_id}/context that returns the latest summary metamessage and messages that occurred after that summary.

Changes

• Added a new SessionContextResponse schema in src/schemas.py
• Implemented a new GET endpoint in src/routers/sessions.py
• The endpoint returns:
  • The latest summary metamessage (or None if no summary exists)
  • All messages that occurred after that summary (capped at 60 messages)
• Added an optional query parameter for number of messages (default to all messages after the summary, max 60)

Implementation Details

• Used history.get_messages_since_latest_summary() to get both the latest summary and messages
• Default to using history.SummaryType.SHORT for the summary type
• If message_count is provided, limit messages to that number (capped at 60)
• If message_count is not provided, still apply the 60-message cap
• Return the summary as-is (which could be None if no summary exists)

Testing

• Verified with linting using ruff

Link to Devin run: https://app.devin.ai/sessions/62d5ec1747cb4b1fb089ed64d32e9f8d
Requested by: Vineeth Voruganti ([email protected])

[devin-ai-integration]

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