fix: sanitize Telegram help command mentions

gateway/run.py

@@ -49,6 +49,29 @@ from hermes_cli.config import cfg_get
 _AGENT_CACHE_MAX_SIZE = 128
 _AGENT_CACHE_IDLE_TTL_SECS = 3600.0  # evict agents idle for >1h
 _PLATFORM_CONNECT_TIMEOUT_SECS_DEFAULT = 30.0
+_TELEGRAM_COMMAND_MENTION_RE = re.compile(r"(?<![\w:/])/([A-Za-z0-9][A-Za-z0-9_-]*)")
+
+
+def _telegramize_command_mentions(text: str, platform: Any) -> str:
+    """Rewrite slash-command mentions to Telegram-valid command names.
+
+    Telegram Bot API command names allow only lowercase letters, digits, and
+    underscores.  Keep other platform renderings unchanged, but normalize
+    Telegram help text so command mentions remain clickable/valid there.
+    """
+    platform_value = getattr(platform, "value", platform)
+    if platform_value != "telegram":
+        return text
+
+    from hermes_cli.commands import _sanitize_telegram_name
+
+    def _replace(match: re.Match[str]) -> str:
+        sanitized = _sanitize_telegram_name(match.group(1))
+        return f"/{sanitized}" if sanitized else match.group(0)
+
+    return _TELEGRAM_COMMAND_MENTION_RE.sub(_replace, text)
+
+
 # Only auto-continue interrupted gateway turns while the interruption is fresh.
 # Stale tool-tail/resume markers can otherwise revive an unrelated old task
 # after a gateway restart when the user's next message starts new work.
@@ -7302,7 +7325,10 @@ class GatewayRunner:
                     lines.append(f"\n... and {len(sorted_cmds) - 10} more. Use `/commands` for the full paginated list.")
         except Exception:
             pass
-        return "\n".join(lines)
+        return _telegramize_command_mentions(
+            "\n".join(lines),
+            getattr(getattr(event, "source", None), "platform", None),
+        )
 
     async def _handle_commands_command(self, event: MessageEvent) -> str:
         """Handle /commands [page] - paginated list of all commands and skills."""
@@ -7355,7 +7381,10 @@ class GatewayRunner:
             lines.extend(["", " | ".join(nav_parts)])
         if page != requested_page:
             lines.append(f"_(Requested page {requested_page} was out of range, showing page {page}.)_")
-        return "\n".join(lines)
+        return _telegramize_command_mentions(
+            "\n".join(lines),
+            getattr(getattr(event, "source", None), "platform", None),
+        )
 
     async def _handle_model_command(self, event: MessageEvent) -> Optional[str]:
         """Handle /model command — switch model for this session.

tests/gateway/test_gateway_command_help.py

@@ -0,0 +1,78 @@
+"""Gateway command help rendering tests."""
+
+import pytest
+
+from gateway.config import Platform
+from gateway.platforms.base import MessageEvent
+from gateway.session import SessionSource
+
+
+def _make_event(text: str, platform: Platform) -> MessageEvent:
+    return MessageEvent(
+        text=text,
+        source=SessionSource(
+            platform=platform,
+            chat_id="chat-1",
+            user_id="user-1",
+            user_name="tester",
+            chat_type="dm",
+        ),
+    )
+
+
+def _make_runner():
+    from gateway.run import GatewayRunner
+
+    return object.__new__(GatewayRunner)
+
+
+@pytest.mark.asyncio
+async def test_help_sanitizes_slash_command_mentions_for_telegram(monkeypatch):
+    """Telegram help output must not expose invalid uppercase/hyphenated slashes."""
+    monkeypatch.setattr(
+        "agent.skill_commands.get_skill_commands",
+        lambda: {
+            "/Linear": {"description": "Open Linear"},
+            "/Custom-Thing": {"description": "Run a custom thing"},
+        },
+    )
+
+    result = await _make_runner()._handle_help_command(
+        _make_event("/help", Platform.TELEGRAM)
+    )
+
+    assert "`/linear`" in result
+    assert "`/custom_thing`" in result
+    assert "`/Linear`" not in result
+    assert "`/Custom-Thing`" not in result
+
+
+@pytest.mark.asyncio
+async def test_commands_sanitizes_slash_command_mentions_for_telegram(monkeypatch):
+    """Paginated Telegram /commands output uses Telegram-valid slash mentions."""
+    monkeypatch.setattr(
+        "agent.skill_commands.get_skill_commands",
+        lambda: {"/Linear": {"description": "Open Linear"}},
+    )
+
+    result = await _make_runner()._handle_commands_command(
+        _make_event("/commands 999", Platform.TELEGRAM)
+    )
+
+    assert "`/linear`" in result
+    assert "`/Linear`" not in result
+
+
+@pytest.mark.asyncio
+async def test_help_keeps_non_telegram_slash_command_mentions_unchanged(monkeypatch):
+    """Only Telegram needs slash mentions rewritten to Telegram command names."""
+    monkeypatch.setattr(
+        "agent.skill_commands.get_skill_commands",
+        lambda: {"/Linear": {"description": "Open Linear"}},
+    )
+
+    result = await _make_runner()._handle_help_command(
+        _make_event("/help", Platform.DISCORD)
+    )
+
+    assert "`/Linear`" in result