hermes - 💡(How to fix) Fix TUI: Add inline ghost-text auto-suggest (parity with CLI) [1 participants]

Problem

The CLI (prompt_toolkit) has inline ghost-text auto-suggest that makes input feel responsive and "ahead of you" — as you type /upd, dim text ate appears inline. The TUI (Ink/React) lacks this entirely, which makes the TUI feel noticeably more limited despite having equivalent tab-completion.

Current state

CLI has:

• SlashCommandAutoSuggest — inline ghost-text for slash commands and subcommands (e.g., /mod → dim el)
• Falls back to history-based inline suggestions for regular text
• Tab completion dropdown (slash commands, paths, @ context references)

TUI has:

• Tab completion dropdown via useCompletion.ts → RPC complete.slash / complete.path (reuses the same SlashCommandCompleter backend)
• No inline ghost-text auto-suggest — this is the gap

Proposed solution

Add an inline auto-suggest layer to the TUI composer that:

1. Shows ghost-text (dim, appended after cursor) for slash commands as the user types — matching the CLI SlashCommandAutoSuggest behavior
2. Falls back to history-based suggestions for non-slash input
3. Accepts suggestion with Right arrow / End / Tab (standard conventions)

Implementation options:

• New RPC method (e.g., complete.suggest) that returns a single inline suggestion given current input, reusing SlashCommandAutoSuggest on the backend
• Or port the suggestion logic to TypeScript client-side

Why this matters

The inline suggest is the single biggest "feel" difference between CLI and TUI. Without it, the TUI input feels inert — you have to explicitly invoke Tab to discover completions. With ghost-text, the input feels alive and the user discovers commands passively while typing. This is the #1 reason users perceive the TUI as "limited" compared to CLI.