Todo list lost from system prompt after context condensation

[0xMink]

Bug Description

The todo list is currently only visible to the model via ephemeral environment_details content in user messages. After context condensation removes earlier messages, the model loses awareness of outstanding todo items. This can lead to premature task completion — the model believes all work is done because it can no longer see the todo list.

Expected Behavior

The todo list should be included in the system prompt so it survives context condensation and remains visible to the model throughout the entire task lifecycle.

Steps to Reproduce

1. Start a task with todo items
2. Generate enough conversation to trigger context condensation
3. Observe that the model loses awareness of incomplete todo items

Impact

Orchestrator mode is particularly affected — when the model loses visibility into incomplete todos after condensation, it may attempt completion while work remains outstanding.

[roomote]

I've analyzed this issue and here's my proposed implementation plan:

Root Cause: The todoList parameter is accepted by SYSTEM_PROMPT() in src/core/prompts/system.ts but is never actually incorporated into the generated prompt text. Additionally, in src/core/task/Task.ts (line 3962), undefined is explicitly passed for the todoList parameter. The todo list only appears in environment_details blocks appended to user messages, which get condensed away.

Proposed Fix (2 files changed):

1. src/core/task/Task.ts - Pass this.todoList instead of undefined when calling SYSTEM_PROMPT (line 3962), so the system prompt generator actually receives the current todo list.

2. src/core/prompts/system.ts - In the generatePrompt function, append the todo list to the system prompt using the existing formatReminderSection() from src/core/environment/reminder.ts. This would be added at the end of the basePrompt string (after the custom instructions section), gated behind settings?.todoListEnabled !== false to respect the user's preference.

This approach:

• Reuses the existing formatReminderSection() helper, keeping formatting consistent
• Ensures the todo list survives context condensation since the system prompt is regenerated fresh for each API call
• Respects the todoListEnabled setting
• Keeps the existing environment_details reminder as well (belt-and-suspenders, and provides the "create a todo list" nudge on first messages)

Please mention @roomote in a comment saying that you approve this plan, and I'll proceed with the implementation.