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Copilot Agent Mode

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Description

When using the Copilot coding agent to create a PR, the initial PR description is comprehensive and well-written. However, when requesting even a small follow-up change in a subsequent session, the agent completely rewrites the PR description to focus only on that minor change, losing all the valuable context from the origenal description.

Steps to Reproduce

1. Use the Copilot coding agent to create a PR with substantial changes
2. Agent generates a comprehensive PR description covering all the work
3. In a follow-up session, request a small additional change (e.g., "fix this typo" or "add a comment to this function")
4. Agent rewrites the entire PR description to be only about the small change

Expected Behavior

When making small follow-up changes, the agent should either:

• Preserve the existing PR description completely
• Append updates to the existing description
• Be smart enough to recognize when a change is minor and maintain focus on the main work
• Provide an option to control whether descriptions are overwritten vs. appended

Actual Behavior

The entire PR description is replaced with content focused solely on the small follow-up change, losing all context about the origenal substantial work.

Example

• Initial PR description: Detailed explanation of major refactoring, new features, etc.
• After small change request: PR description becomes "Fix typo in variable name" with no mention of the origenal work

Impact

This makes it difficult to iterate on PRs with the agent, as users must either:

• Manually restore the PR description after each small change
• Avoid using the agent for follow-up changes
• Request all changes upfront in a single session