hermes-agent/tools/focus_pane_tool.py
Brooklyn Nicholson 70ba3c4828 feat(desktop): agent can focus panes + shared desktop-UI event bridge
Extract the open_preview emitter into a shared tools/desktop_ui bridge
(one gateway-injected sink, routed by HERMES_UI_SESSION_ID) and add a
second desktop-gated tool on top of it:

- focus_pane(chat|files|terminal|review|sessions) -> pane.reveal event.
  The desktop runs each pane's own reveal path (revealDesktopPane table)
  and only acts on the active window -- a background turn never moves the
  user's focus (desktop AGENTS.md: offer, don't hijack).

open_preview now emits through the same bridge. Both tools are check_fn
on HERMES_DESKTOP (zero footprint elsewhere), sitting beside
read_terminal/close_terminal in _HERMES_CORE_TOOLS.

Deliberately not adding run_slash: letting the agent fire slash commands
mid-turn (/model, /new, /clear) fights prompt-cache + conversation
invariants.
2026-07-22 12:13:01 -05:00

70 lines
2.3 KiB
Python

#!/usr/bin/env python3
"""Reveal/focus a pane in the Hermes desktop GUI.
Gated on ``HERMES_DESKTOP`` (like the other GUI affordances). Emits
``pane.reveal`` through the shared ``desktop_ui`` bridge; the renderer runs each
pane's own reveal path and only acts on the active window (a background turn
never moves the user's focus). To show a URL/file, use ``open_preview``.
"""
import json
from tools import desktop_ui
from tools.registry import registry, tool_error
from utils import env_var_enabled
PANES = ("chat", "files", "terminal", "review", "sessions")
def focus_pane_tool(pane: str) -> str:
"""Ask the desktop GUI to reveal and focus ``pane``."""
name = (pane or "").strip().lower()
if name not in PANES:
return tool_error(f"pane must be one of: {', '.join(PANES)}.")
try:
ok = desktop_ui.emit("pane.reveal", {"pane": name})
except Exception as exc:
return tool_error(f"Failed to focus the {name} pane: {exc}")
if not ok:
return tool_error("Pane focus is only available in the Hermes desktop app.")
return json.dumps({"success": True, "pane": name}, ensure_ascii=False)
def check_focus_pane_requirements() -> bool:
"""Desktop GUI only — HERMES_DESKTOP is set on the gateway the app spawns."""
return env_var_enabled("HERMES_DESKTOP")
FOCUS_PANE_SCHEMA = {
"name": "focus_pane",
"description": (
"Reveal and focus a pane in the Hermes desktop app when the user asks to "
"see it — e.g. \"show me the terminal\", \"open the file browser\", \"show "
"the diff\". Panes: chat (the conversation), files (project file browser), "
"terminal (embedded shell), review (git diff), sessions (the session list). "
"To show a URL or file in the preview pane, use open_preview instead."
),
"parameters": {
"type": "object",
"properties": {
"pane": {
"type": "string",
"enum": list(PANES),
"description": "Which pane to reveal.",
},
},
"required": ["pane"],
},
}
registry.register(
name="focus_pane",
toolset="terminal",
schema=FOCUS_PANE_SCHEMA,
handler=lambda args, **kw: focus_pane_tool(pane=args.get("pane", "")),
check_fn=check_focus_pane_requirements,
emoji="🪟",
)