fix: preserve config_context_length when switching models

hermes_cli/model_switch.py

@@ -790,15 +790,21 @@ def list_authenticated_providers(
         })
         seen_slugs.add(slug)
 
-    # --- 2. Check Hermes-only providers (nous, openai-codex, copilot) ---
+    # --- 2. Check Hermes-only providers (nous, openai-codex, copilot, opencode-go) ---
     from hermes_cli.providers import HERMES_OVERLAYS
+    from hermes_cli.auth import PROVIDER_REGISTRY as _auth_registry
     for pid, overlay in HERMES_OVERLAYS.items():
         if pid in seen_slugs:
             continue
         # Check if credentials exist
         has_creds = False
         if overlay.extra_env_vars:
             has_creds = any(os.environ.get(ev) for ev in overlay.extra_env_vars)
+        # Also check api_key_env_vars from PROVIDER_REGISTRY for api_key auth_type
+        if not has_creds and overlay.auth_type == "api_key":
+            pcfg = _auth_registry.get(pid)
+            if pcfg and pcfg.api_key_env_vars:
+                has_creds = any(os.environ.get(ev) for ev in pcfg.api_key_env_vars)
         if overlay.auth_type in ("oauth_device_code", "oauth_external", "external_process"):
             # These use auth stores, not env vars — check for auth.json entries
             try:

run_agent.py

@@ -1145,6 +1145,9 @@ def __init__(
             except (TypeError, ValueError):
                 _config_context_length = None
 
+        # Store for reuse in switch_model (so config override persists across model switches)
+        self._config_context_length = _config_context_length
+
         # Check custom_providers per-model context_length
         if _config_context_length is None:
             _custom_providers = _agent_cfg.get("custom_providers")
@@ -1383,6 +1386,7 @@ def switch_model(self, new_model, new_provider, api_key='', base_url='', api_mod
                 base_url=self.base_url,
                 api_key=self.api_key,
                 provider=self.provider,
+                config_context_length=getattr(self, "_config_context_length", None),
             )
             self.context_compressor.model = self.model
             self.context_compressor.base_url = self.base_url

tests/hermes_cli/test_opencode_go_in_model_list.py

@@ -0,0 +1,33 @@
+"""Test that opencode-go appears in /model list when credentials are set."""
+
+import os
+from unittest.mock import patch
+
+from hermes_cli.model_switch import list_authenticated_providers
+
+
+@patch.dict(os.environ, {"OPENCODE_GO_API_KEY": "test-key"}, clear=False)
+def test_opencode_go_appears_when_api_key_set():
+    """opencode-go should appear in list_authenticated_providers when OPENCODE_GO_API_KEY is set."""
+    providers = list_authenticated_providers(current_provider="openrouter")
+
+    # Find opencode-go in results
+    opencode_go = next((p for p in providers if p["slug"] == "opencode-go"), None)
+
+    assert opencode_go is not None, "opencode-go should appear when OPENCODE_GO_API_KEY is set"
+    assert opencode_go["models"] == ["glm-5", "kimi-k2.5", "mimo-v2-pro", "mimo-v2-omni", "minimax-m2.7", "minimax-m2.5"]
+    # opencode-go is in PROVIDER_TO_MODELS_DEV, so it appears as "built-in" (Part 1)
+    assert opencode_go["source"] == "built-in"
+
+
+def test_opencode_go_not_appears_when_no_creds():
+    """opencode-go should NOT appear when no credentials are set."""
+    # Ensure OPENCODE_GO_API_KEY is not set
+    env_without_key = {k: v for k, v in os.environ.items() if k != "OPENCODE_GO_API_KEY"}
+
+    with patch.dict(os.environ, env_without_key, clear=True):
+        providers = list_authenticated_providers(current_provider="openrouter")
+
+        # opencode-go should not be in results
+        opencode_go = next((p for p in providers if p["slug"] == "opencode-go"), None)
+        assert opencode_go is None, "opencode-go should not appear without credentials"

tests/run_agent/test_switch_model_context.py

@@ -0,0 +1,74 @@
+"""Tests that switch_model preserves config_context_length."""
+
+from unittest.mock import MagicMock, patch
+
+from run_agent import AIAgent
+from agent.context_compressor import ContextCompressor
+
+
+def _make_agent_with_compressor(config_context_length=None) -> AIAgent:
+    """Build a minimal AIAgent with a context_compressor, skipping __init__."""
+    agent = AIAgent.__new__(AIAgent)
+
+    # Primary model settings
+    agent.model = "primary-model"
+    agent.provider = "openrouter"
+    agent.base_url = "https://openrouter.ai/api/v1"
+    agent.api_key = "sk-primary"
+    agent.api_mode = "chat_completions"
+    agent.client = MagicMock()
+    agent.quiet_mode = True
+
+    # Store config_context_length for later use in switch_model
+    agent._config_context_length = config_context_length
+
+    # Context compressor with primary model values
+    compressor = ContextCompressor(
+        model="primary-model",
+        threshold_percent=0.50,
+        base_url="https://openrouter.ai/api/v1",
+        api_key="sk-primary",
+        provider="openrouter",
+        quiet_mode=True,
+        config_context_length=config_context_length,
+    )
+    agent.context_compressor = compressor
+
+    # For switch_model
+    agent._primary_runtime = {}
+
+    return agent
+
+
+@patch("agent.model_metadata.get_model_context_length", return_value=131_072)
+def test_switch_model_preserves_config_context_length(mock_ctx_len):
+    """When switching models, config_context_length should be passed to get_model_context_length."""
+    agent = _make_agent_with_compressor(config_context_length=32_768)
+
+    assert agent.context_compressor.model == "primary-model"
+    assert agent.context_compressor.context_length == 32_768  # From config override
+
+    # Switch model
+    agent.switch_model("new-model", "openrouter", api_key="sk-new", base_url="https://openrouter.ai/api/v1")
+
+    # Verify get_model_context_length was called with config_context_length
+    mock_ctx_len.assert_called_once()
+    call_kwargs = mock_ctx_len.call_args.kwargs
+    assert call_kwargs.get("config_context_length") == 32_768
+
+    # Verify compressor was updated
+    assert agent.context_compressor.model == "new-model"
+
+
+def test_switch_model_without_config_context_length():
+    """When switching models without config override, config_context_length should be None."""
+    agent = _make_agent_with_compressor(config_context_length=None)
+
+    with patch("agent.model_metadata.get_model_context_length", return_value=128_000) as mock_ctx_len:
+        # Switch model
+        agent.switch_model("new-model", "openrouter", api_key="sk-new", base_url="https://openrouter.ai/api/v1")
+
+        # Verify get_model_context_length was called with None
+        mock_ctx_len.assert_called_once()
+        call_kwargs = mock_ctx_len.call_args.kwargs
+        assert call_kwargs.get("config_context_length") is None