Isn't manually editing an agent plan supported?

Whenever I use Plan mode, I noticed that the Build operation only respect changes that I asked in the chat, and not those that I make directly in the plan markdown file. Is that the expected behavior?

E.g, suppose the plan says it’s going to create a dialog with title “Test 123”. If I edit the markdown file to change the title to “New title”, the build operation will still use “Test 123”. However, if I ask in the chat something like “Let’s use the title ‘New title’ for the dialog”, it will make the changes to the markdown and build it correctly.

Hey, thanks for the report.

Yep, this is a known issue in Plan mode. Manual edits in the markdown file don’t always sync correctly when the agent is running or updating the plan. The team is working on a fix.

Temporary workaround: instead of editing the markdown directly, use chat to make changes to the plan, like you described, “Let’s use the title ‘New title’ for the dialog”. Changes made via chat apply correctly.

Similar report: Models ignore manual plan edits