[FEATURE]: Notify subagents when their context are running out #53030

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1. github-actions

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   jlongster

   on Oct 3, 2026
2. github-actions commented on Oct 3, 2026

   

   github-actionsBot

   on Oct 3, 2026 – with GitHub Actions

   Contributor

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

   • #53024: Also discusses subagent context windows and explicitly proposes injecting a wrap-up instruction after a threshold is reached.
   • #44208: Requests configurable token-usage threshold alerts, including an agent-injected message as an option.
3. opencodejr commented on Oct 27, 2026

   

   opencodejrBot

   on Oct 27, 2026

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   Thanks for the follow-up to #53024! You're asking for OpenCode to warn a subagent automatically when its context usage passes a set threshold (for example 40% or 70%), telling it to wrap up and report back, so smaller models don't keep going until they start making things up.

   Maintainers will consider it. Related issues:

   • [FEATURE]: Allow checking context window inside subagents #53024: your earlier request, which also covered seeing the context usage.
   • tui: sidebar missing when viewing a subagent session — no context usage or cost for that session #48548: context usage is missing from the sidebar when viewing a subagent session.
   • [FEATURE]:Show subagent token usage in TUI token counter #22103: show subagent token usage in the TUI.
   • [FEATURE]: Show parent and child current context usage in the TUI sidebar #20644: show context usage for parent and child sessions in the sidebar.

   In the meantime, this could possibly be done as a v2 plugin, though I haven't built or tested one. The session context hook can add an instruction before each model request, and a plugin can tell when it is in a subagent session (one with a parent). It would need to compare the session's latest token usage against the model's context limit.