hermes - 💡(How to fix) Fix Bug: /reasoning in TUI returns 'unknown reasoning value: medium'

Hermes Version: v0.16.0 (2026.6.5) Platform: macOS, Apple Terminal Python: 3.11.15

Description

Using /reasoning in the TUI (without arguments, to view current setting) returns:

error: unknown reasoning value: medium

This happens every time, regardless of the current reasoning effort setting.

Steps to Reproduce

1. Start Hermes TUI: hermes
2. Type /reasoning (no arguments, to view current setting)
3. Error appears: error: unknown reasoning value: medium

Analysis

The error originates from tui_gateway/server.py:6148:

arg = str(value or "").strip().lower()
# ...
parsed = parse_reasoning_effort(arg)
if parsed is None:
    return _err(rid, 4002, f"unknown reasoning value: {value}")

However, parse_reasoning_effort("medium") correctly returns {'enabled': True, 'effort': 'medium'} when tested directly via Python.

The issue appears to be that the TUI's config.set handler is being invoked instead of the config.get handler when the user types /reasoning without arguments. The TUI code in ui-tui/src/app/slash/commands/session.ts should route to config.get when no argument is provided:

if (!arg) {
  return ctx.gateway
    .rpc<ConfigGetValueResponse>('config.get', { key: 'reasoning' })

But somehow the SET handler receives the request with the current config value (medium) as the value parameter, and parse_reasoning_effort may fail due to an import path issue or environment mismatch in the TUI gateway process.

Workaround

Use CLI commands instead:

hermes config set agent.reasoning_effort xhigh
hermes config show | grep reasoning

Related Code

• SET handler: tui_gateway/server.py:6104-6152
• GET handler: tui_gateway/server.py:6392-6403
• TUI command: ui-tui/src/app/slash/commands/session.ts:388-428
• parse_reasoning_effort: hermes_constants.py