IO diagnostics — round 3 brief (Zach's feedback, Daily Note 2026-10-23, "# feedback on Digoinastics")

Screenshots: a private note image 20261023081913.png … 20261023085904.png (18).

Settled (lane R3-A builds these; they are constraints for every proposal)

Resizable panes. The tree|detail boundary and the table|inspector boundary are draggable. Widths are remembered (localStorage, try/catch), double-click restores the default, and every pane has a minimum width. Standing rule: a private note.
The inspector folds in the Table view. By default the table gets the full width. Clicking a row slides the inspector in; clicking back into the table, Escape, or the inspector's close button hides it. A toggle (and a key, ]) pins it open.
P1 is the default, opened (rows with children open; Computer stays closed).
One View-options control, like Claude Transcripts' filter panel (Pasted image …082249): a sliders button beside the search box opens a popover. - Group by: Devices (p1, default) · Type (p2) · Port (p4) · Bus (p5) · Physical (p0). P3 is dropped from the picker; Zach wants one row per entity, with detail living in the Table. - Sort by: Status (problems first) · Name · Last change. - The structure's own toggles (Ports, Empty ports). - Tree style, skin, mode. The bottom-right cluster shrinks to the skin/mode controls, or goes away if the popover holds everything.
Two default skins. Bare Metal is the high-contrast skin, renamed, and the default. Pretty is Notion, renamed. The other nine move under "More skins".
Warning colours are reserved for diagnostics. warn/error/stale/unknown colours (and their soft tints) appear ONLY on true diagnostic results. - Utilities lose their amber/red danger pills; danger becomes a neutral word or icon. - Preconditions that are not met read in muted text, not orange. - A token-usage gate in the test enforces this.
Utilities, quieter. - Each row is the icon + title; the description becomes a hover/focus tooltip. - While an action runs, its button greys out and quiet muted text sits under it ("Checking communication… 3 s", like the "received 08:55:30 · 1 s ago" line Zach liked). - No live streaming wall.
Detail panel reads top to bottom. Sections with collapsible headers (remembered per section), no card grid. Default width compact (Pasted image …085430).
Activity is one full-width column. The fault memory and link health leave this view: link health belongs to the Computer entity, and fault memory becomes a filter of the log.
Self-held lock is not "blocked". When the rack bus lock is held by THIS host's own running diagnose, a precondition reads "this host's own check is running (a few s)". It never reads "blocked by pid …" (host-side).

Three sets of 5 proposals (after R3-A lands; live in the app, switchable bottom-right, variant 1 = default)

Diagnostics page (what you see when you click an entity). First: the diagnostics status table (level · name · message), quiet by default, colour only on problems — what rolls up to the entity's level. Then:
row expand → values / metadata, plus sparklines;
row click → a page for that one diagnostic (drill: Computer → entity → diagnostic; entities can have children);
a health bar over a rolling window (rqt_robot_monitor, Pasted image …084557). Per-status timestamps make out-of-sync arrivals honest.
App-wide history window setting.
Reference for the Computer: the ROS2 System Webview (Pasted image …084333).
Utility menu. Less at a glance, descriptions on hover, quiet busy state, no warning colours.
Bare Metal variants. 5 more takes on the high-contrast "bare metal, terminal-like but readable" feel, applying ISA-101 high-performance HMI concepts (grey normal, colour only for abnormal, analog-indicator thinking, alarm priority by shape + position).

CLI as the seam (Zach: "should all of the controls register themselves as CLI? then diagnostics never cares about any internal communication")

Yes, it already is one: a driver is an executable speaking describe | diagnose | act, and each utility runs a command line. Round 3 adds the stock Monitoring Plugins (Nagios) API: any command whose exit code 0/1/2/3 = OK/WARN/CRITICAL/UNKNOWN, with the first stdout line as the message and perfdata after |, is a diagnostic. No code is needed for simple checks.