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Status:✏️ DRAFT
Date:📅 2026-08-19
Domain:📦 Chatroom TUI View for Harness

SPEC-0009: Chatroom TUI View for Harness

Not yet implemented. Design-stage; no chatroom mode exists in the TUI today. See harness issue #3.

Overview​

This specification defines a new "chatroom" view within the Harness TUI that aggregates live output from all supported agent harnesses (Claude Code, Codex, Crush, OpenCode, Pi) into a single chronological stream. Each harness appears as a distinct "user" with a username (e.g., @crush-worker) and color. Tool calls, tool results, and user messages render as chat messages. An activity feed panel provides a summary timeline.

The chatroom view is a new mode in the Harness TUI (bubbletea-based), accessible via keybinding from the main view. It leverages agent-trace's tail.Watcher to consume live events.

See 📝 ADR-0015 for the architectural decision context.

This spec extends SPEC-0001. SPEC-0001 REQ "Mode Machine" declares two primary modes — Dashboard and Attached; this spec adds the chatroom as a third primary mode. Every binding below is a default, declared through the Bubbles key.Binding registry that SPEC-0001 REQ "Keybinding Registry" already requires, so ? renders them and a future config can remap them.

Requirements​

Requirement: Chatroom View Integration​

The chatroom SHALL be a new view mode within the existing Harness TUI, accessible via keybinding from the main harness list view.

Scenario: Enter Chatroom​

  • WHEN user presses the chatroom keybinding (e.g., Ctrl+R or C) from the main view
  • THEN the TUI SHALL transition to the chatroom view
  • THEN the chatroom view SHALL initialize a tail.Watcher with tail.DefaultWatchConfig() and tail.DefaultAdapters()
  • THEN the chatroom view SHALL call Watcher.Start(ctx) and begin consuming events from Watcher.Events()

Scenario: Exit Chatroom​

  • WHEN user presses the exit keybinding (e.g., Esc or q) from the chatroom view
  • THEN the chatroom view SHALL call Watcher.Stop() to gracefully shut down
  • THEN the TUI SHALL transition back to the main harness list view
  • THEN the chatroom event buffer SHALL be cleared (or preserved for re-entry per implementation choice)

Requirement: Multi-Harness Event Aggregation​

The chatroom view SHALL consume the unified Event channel from tail.Watcher configured with all five harness adapters.

Scenario: Event Reception​

  • WHEN any harness produces a new tool call, tool result, or user message
  • THEN the corresponding adapter SHALL emit a tail.Event through the watcher
  • THEN the chatroom view SHALL receive the event within 2 seconds (watcher poll interval)

Requirement: Chronological Event Ordering​

The chatroom view SHALL display all events from all harnesses in a single unified stream ordered by event timestamp (oldest first, newest at bottom).

Scenario: Event Ordering​

  • WHEN events arrive from multiple harnesses concurrently
  • THEN the chatroom view SHALL merge them into a single timeline sorted by Event.Classified.Timestamp (or Event.ReceivedAt as fallback)
  • THEN events with identical timestamps SHALL be ordered by harness name for determinism

Requirement: Harness Identity Display​

Each harness SHALL have a distinct visual identity in the chatroom.

Scenario: Harness Username​

  • WHEN rendering an event whose session SPEC-0006 REQ "Run Correlation" attributes to exactly one harness — same adapter and workdir, a known run of that harness covering the session's start, and no other claimant
  • THEN the username SHALL be @<harness name> (e.g. @fleet-sweep)
  • WHEN the session is not attributable to exactly one harness
  • THEN the username SHALL be the tool identity, which names no harness:
    • claude-code → @claude-code
    • codex → @codex
    • crush → @crush
    • opencode → @opencode
    • pi → @pi
  • THEN usernames SHALL be recomputed whenever the daemon's harness list changes, since a run starting or ending changes what is attributable

The tool identity was once @crush-worker for crush, which labelled every crush session on the machine — scheduled sweeps, other agents, interactive runs — as one particular harness.

Scenario: Harness Color​

  • WHEN rendering an event from a harness
  • THEN the username and message SHALL use a distinct color per harness, drawn from the existing internal/tui/theme palette (theme.Colors) so the chatroom resolves and degrades through the same light/dark and colorprofile path as the rest of the TUI:
    • @claude-code: Accent (Charm purple — #5A3FD6 light / #7D56F4 dark)
    • @codex: Mint (#009E70 / #00F0A8)
    • crush (@crush, or an attributed crush harness): Amber (#B26A00 / #FFB454)
    • @opencode: Cyan (#0E8FB0 / #4EE6FF)
    • @pi: Pink (#D6247A / #FF5FA2)
  • THEN no new palette token SHALL be introduced for harness identity; Coral stays reserved for failure emphasis per SPEC-0001 REQ "State Presentation"

Requirement: Tool Call Rendering​

Tool calls SHALL render as chat messages with action type badges.

Scenario: Tool Call Message​

  • WHEN a classify.Event with Action ≠ ActionOther is received
  • THEN the chatroom view SHALL render a message:
    • Username in harness color (e.g., @pr-sweep, or @crush when unattributed)
    • Action badge: [SEARCH], [READ], [EDIT], [EXEC], [VERIFY], [OTHER]
    • Tool name (e.g., grep, bash, read_file)
    • Summary from Event.Summary (truncated to 80 chars)
    • Timestamp in HH:MM:SS format

Scenario: Tool Call with Targets​

  • WHEN a tool call has Targets (file paths)
  • THEN the chatroom view SHALL display targets as navigable references below the message
  • THEN targets SHALL show touch rank indicators (edit > read > hit)

Requirement: Tool Result Rendering​

Tool results SHALL render as follow-up messages linked to their tool call.

Scenario: Tool Result Message​

  • WHEN a classify.Event represents a tool result (paired with a prior tool call)
  • THEN the chatroom view SHALL render a message:
    • Same username/harness color
    • Status badge: [OK] (success) or [ERROR] (failure)
    • Duration badge (e.g., 1.2s)
    • Truncated output preview (first 120 chars)
    • Visual indentation/grouping with the originating tool call

Requirement: User Message Rendering (Marks)​

User messages from classify.Mark SHALL render as chat messages.

Scenario: User Message​

  • WHEN a tail.Event contains Marks (user messages, compactions, subagent launches)
  • THEN the chatroom view SHALL render each mark as a message:
    • Username in harness color
    • Mark type badge: [USER], [COMPACTION], [SUBAGENT]
    • Mark content (truncated to 200 chars)
    • Timestamp

Requirement: Activity Feed Panel​

A secondary panel SHALL display a condensed activity timeline.

Scenario: Activity Feed​

  • WHEN the chatroom view is active
  • THEN a side panel SHALL show:
    • One line per event: HH:MM:SS @harness action/tool summary
    • Color-coded by harness
    • Selecting an entry scrolls the main chat to that event
    • Auto-scrolls to latest by default

Requirement: Keyboard Navigation​

The chatroom view SHALL support standard keyboard controls consistent with Harness TUI conventions.

Scenario: Scrolling​

  • WHEN user presses Up/Down or k/j
  • THEN the chat viewport SHALL scroll line by line
  • WHEN user presses Page Up/Page Down or Ctrl+u/Ctrl+d
  • THEN the chat viewport SHALL scroll by half-page

Scenario: Pause/Resume Auto-Scroll​

  • WHEN user presses Space or p
  • THEN auto-scroll to new events SHALL toggle (pause/resume)
  • THEN a pause indicator SHALL be visible in the status bar

Scenario: Filter by Harness​

  • WHEN user presses 1–5 (mapped to 5 harnesses)
  • THEN the chatroom view SHALL filter events to show only the selected harness
  • WHEN user presses 0 or a
  • THEN the chatroom view SHALL show all harnesses (no filter)
  • THEN active filter SHALL be indicated in status bar

Scenario: Panel Focus Switch​

  • WHEN user presses Tab
  • THEN focus SHALL toggle between chat panel and activity feed panel
  • THEN focused panel SHALL have visible focus indicator

Scenario: Exit Chatroom​

  • WHEN user presses Esc or q
  • THEN the chatroom view SHALL gracefully stop the watcher and return to main view

Requirement: Terminal Resize Handling​

The chatroom view SHALL handle terminal resize events gracefully.

Scenario: Resize​

  • WHEN the terminal window is resized
  • THEN the chatroom view SHALL reflow layout (chat panel, activity panel, status bar)
  • THEN scroll position SHALL be preserved relative to bottom

Requirement: Degraded And Monochrome Terminals​

The chatroom view SHALL remain fully legible when color is reduced or absent, using the degradation path SPEC-0001 REQ "State Presentation" already defines rather than a new one.

Scenario: Mono terminal​

  • WHEN the TUI runs in a monochrome terminal or a degraded SSH client, so the theme's colorprofile resolves palette entries to nil
  • THEN every chatroom message SHALL remain attributable from its @harness username prefix, its badge text, and its timestamp alone, with no color carrying meaning by itself

Requirement: Reduced Motion​

The chatroom view SHALL support reduced motion for accessibility. Harness reads no HARNESS_* environment variables today (only TERM, TMUX, and the XDG_* set), so this introduces a new toggle rather than reusing an existing one; it SHALL be expressed as a config key on the 📝 ADR-0006 config surface, with an env override reserved for a later revision.

Scenario: Reduced Motion​

  • WHEN reduced motion is enabled
  • THEN auto-scroll animations SHALL be disabled (instant jump to new events)

Security Requirements​

None. The chatroom is a local terminal view that reads on-disk trajectory files through agent-trace; it opens no listener and makes no network call.

Accessibility Requirements​

The following apply per WCAG 2.1 AA, adapted for a TUI:

Requirement: Keyboard Operability​

All chatroom functions SHALL be operable via keyboard alone (no mouse required).

Requirement: Color Not Sole Indicator​

Harness identity SHALL NOT rely on color alone — username prefix (@harness) and/or formatting (bold, underline) MUST always be present.

Requirement: Degraded And Monochrome Terminals​

As specified in "Degraded And Monochrome Terminals" requirement above.

Requirement: Screen Reader Compatible Output​

All text output SHALL be plain text with semantic structure (no raw escape sequences in logs) so screen readers can process scrollback.

Requirement: Focus Management​

When switching between chat panel and activity panel (via Tab), focus SHALL move visibly and predictably.

Requirement: Reduced Motion​

As specified in "Reduced Motion" requirement above.

Backend Quality Requirements​

This spec involves backend quality concerns (concurrency, error handling):

Requirement: Concurrency Safety​

The chatroom view's event processing SHALL use proper context propagation for cancellation. The watcher runs in a goroutine; the bubbletea event loop runs in another. Channel communication between them SHALL be bounded and respect context cancellation.

Requirement: Error Handling Standards​

All errors from tail.Watcher, adapters, and bubbletea SHALL be wrapped with context. Silent error swallowing SHALL NOT occur — errors SHALL be logged to Harness's debug log and/or displayed in a status area.

Design​

This spec is paired with the design notes, which covers the architecture, decisions, and implementation details.

Direct relationships declared in YAML frontmatter (per the SDD plugin's artifact-graph convention). Run /sdd:graph chain SPEC-0009 for the transitive view.