fix: Enhance Kimi Coding API mode detection and User-Agent

hermes_cli/model_switch.py

@@ -678,6 +678,7 @@ def switch_model(
         _da = DIRECT_ALIASES.get(resolved_alias)
         if _da is not None and _da.base_url:
             base_url = _da.base_url
+            api_mode = ""  # clear so determine_api_mode re-detects from URL
             if not api_key:
                 api_key = "no-key-required"
 

hermes_cli/providers.py

@@ -427,6 +427,16 @@ def determine_api_mode(provider: str, base_url: str = "") -> str:
     """
     pdef = get_provider(provider)
     if pdef is not None:
+        # Even for known providers, check URL heuristics for special endpoints
+        # (e.g. kimi /coding endpoint needs anthropic_messages even on 'custom')
+        if base_url:
+            url_lower = base_url.rstrip("/").lower()
+            if "api.kimi.com/coding" in url_lower:
+                return "anthropic_messages"
+            if url_lower.endswith("/anthropic") or "api.anthropic.com" in url_lower:
+                return "anthropic_messages"
+            if "api.openai.com" in url_lower:
+                return "codex_responses"
         return TRANSPORT_TO_API_MODE.get(pdef.transport, "chat_completions")
 
     # Direct provider checks for providers not in HERMES_OVERLAYS
@@ -439,6 +449,8 @@ def determine_api_mode(provider: str, base_url: str = "") -> str:
         hostname = base_url_hostname(base_url)
         if url_lower.endswith("/anthropic") or hostname == "api.anthropic.com":
             return "anthropic_messages"
+        if hostname == "api.kimi.com" and "/coding" in url_lower:
+            return "anthropic_messages"
         if hostname == "api.openai.com":
             return "codex_responses"
         if hostname.startswith("bedrock-runtime.") and base_url_host_matches(base_url, "amazonaws.com"):