Session Todo-list is forgotten after compaction

[hosseinalipour]

Description

Session todo lists are lost after compaction. The todo lists should persist across compaction operations but are currently being cleared. (auto compaction only. I don't know if it can be reproduced with /compact command)

Expected behavior:
Todo lists persist across compaction

Actual behavior:
Todo lists are cleared after compaction

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opencode version: 1.0.185
model this happened with: Claude Opus 4.5 127k context
Can provide logs if any, I still have the session this problem happened.

OpenCode version

No response

Steps to reproduce

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Screenshot and/or share link

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Operating System

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Terminal

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[github-actions]

This issue might be a duplicate of or related to existing issues. Please check:

• undo does not undo todo list, resulting in agents continuing on the same path as the undo #4081: undo does not undo todo list, resulting in agents continuing on the same path as the undo (similar todo list state persistence issue)
• opentui: todo list missing data #3423: opentui: todo list missing data (related todo list data loss)
• Context size in sidebar not updated after /compact #5760: Context size in sidebar not updated after /compact (compaction-related state issues)

Feel free to ignore if none of these address your specific case.

[tedin7]

Hi! I noticed that after compaction, the model sometimes loses track of todos, probably depends on whether the summary happens to mention them clearly.
I have a small fix (~5 lines) that adds a reminder to the compaction prompt when todos exist, so the summary reliably includes them.

Happy to open a PR if useful, or just share the approach!

[gasatrya]

I think in your case just the Todo-list, you can set the Compaction prune to false, see this config https://opencode.ai/docs/config/#compaction

[rexdotsh]

Hi! I noticed that after compaction, the model sometimes loses track of todos, probably depends on whether the summary happens to mention them clearly. I have a small fix (~5 lines) that adds a reminder to the compaction prompt when todos exist, so the summary reliably includes them.

Happy to open a PR if useful, or just share the approach!

Hi @tedin7, mind sharing your approach or opening a PR?