Make parent-owned sub-agent threads read-only in the TUI#33841
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## Why Multi-agent V2 spawned threads are controlled by their parent and reject direct app-server input. The TUI should expose that ownership instead of presenting an input flow that the server will reject. ## What changed - Add the experimental `Thread.canAcceptDirectInput` capability for loaded threads and populate it from the same policy used to validate `turn/start` and `turn/steer`. Stored, unloaded threads report `null`. - Carry the capability through TUI thread discovery, selection, startup, and resume flows, with a compatibility fallback for older app servers. - Present parent-owned threads as view-only, preserve drafts and queued input, block agent-directed commands and settings shortcuts, and keep local navigation and inspection commands available. ## Testing - Cover V1 writable and V2 view-only spawned threads through selection and resume. - Cover composer submission paths, queued and initial input preservation, allowed navigation commands, settings shortcuts, and the view-only UI. GitOrigin-RevId: 495ad051249e5577fb0b0c1cc8c40a0998d04918
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Make parent-owned sub-agent threads read-only in the TUI
Why
Multi-agent V2 spawned threads are controlled by their parent and reject direct
app-server input. The TUI should expose that ownership instead of presenting an
input flow that the server will reject.
What changed
Thread.canAcceptDirectInputcapability for loadedthreads and populate it from the same policy used to validate
turn/startand
turn/steer. Stored, unloaded threads reportnull.resume flows, with a compatibility fallback for older app servers.
block agent-directed commands and settings shortcuts, and keep local
navigation and inspection commands available.
Testing
resume.
allowed navigation commands, settings shortcuts, and the view-only UI.