[Storage] Isolate plan files per session

[facelezzzz]

In Plan mode, the generated markdown files are stored under:

~/.gemini/tmp/<project_hash>/plans

This causes plan files from different sessions to be shared and accessible across sessions. As a result, new sessions can be polluted by plans generated in previous sessions.

Today, when I was using the Gemini CLI, the model explicitly mentioned that it inspected the directory ~/.gemini/tmp/<project_hash>/plans, found some information related to my question, and then read those plan files. Because of this, the current session was continuously influenced by plan files generated by other sessions, making it unable to complete the task correctly.

I believe this is a design issue. Plan files should be isolated per session, or at least not automatically visible to new sessions.

[facelezzzz]

@jerop When you have some time, could you please take a look at this issue? I know you’re very busy. I checked the commit history and it seems that Plan mode has mainly been driven by you. Thanks again for all your work.

[jerop]

@facelezzzz thanks for this issue report, added this to our list of initial issues to address