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Describe the enhancement you want to request

[FEATURE] Project-level todo lists visible in GUI

Description

Currently, agents can create internal todo lists using the todowrite tool, but these are only visible to the agent. There is no way for users to view these project-level tasks from the GUI.

Current Behavior

• Agents can create internal todo lists with todowrite
• These are only visible to the agent during the session
• No persistence across sessions
• No user-facing visibility

Requested Feature

• Project-level todo lists that are visible in the GUI
• Cross-session persistence (stored in project directory)
• Users can view, but not necessarily edit
• Complementary to internal agent tracking

Use Cases

1. Track implementation progress for a project
2. Show users what tasks have been completed vs. pending
3. Provide transparency on agent's understanding of the project
4. Allow users to add their own tasks to the list

Potential Implementation Ideas

• Store todo list in .opencode/todos.md in project root
• Use a sidebar panel in the GUI to display tasks
• Simple format: - [ ] Task description
• Support priorities: high, medium, low

Alternatives Considered

• Keeping it as agent-only internal feature
• Using external tools (Jira, Notion, etc.)

Additional Context

This would improve transparency and allow users to track what needs to be done without relying on the agent to report status.