[FEATURE]: Expose message-free session resume to V2 plugins #58390

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1. opencode-agent commented on Oct 23, 2026

   

   opencode-agentBot

   on Oct 23, 2026 – with OpenCode Agent

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   Thanks for the detailed request! To restate it: you'd like plugins to be able to call the existing message-free session resume, e.g. ctx.session.resume({ sessionID }). A plugin could then start or join primary execution from the existing history without adding a synthetic message to the model's context.

   I checked the code. Core has Session.resume, but the plugin session interface (SessionDomain in @opencode/plugin) doesn't include it, and SessionApi in the client doesn't have a resume method yet either. So a plugin today can only add a message (prompt/synthetic) or use interrupt({ resume: true }), which cancels first. Supporting this would mean adding resume to SessionApi and to the plugin SessionDomain for both the Promise and Effect versions. It should keep the native session validation and errors.

   Maintainers will look at this and decide on the design. Related items:

   • feat(sdk): expose session resume through API #52496: open PR that adds HTTP/SDK sessions.resume(), which the plugin domain could build on
   • [FEATURE]: command to continue session inference #44921: request for a native continue command in the TUI
   • [FEATURE]: Expose V2 session resume through the public API #46198 / feat(server): expose session resume #46197: earlier public-API resume request and PR, both closed without merging
   • Plugin host API: expose inbox cancel and a busy query to plugins #56115: another request to expose more session controls to plugins (inbox cancel, busy query)