fix(cron): derive provider from model prefix in _build_job_prompt

When runtime_provider is empty but runtime_model has a cloud prefix
(e.g. "nous/mimo-v2-pro"), the PROVIDER field in the runtime context
block was missing. Now _build_job_prompt derives the provider from
the model prefix before building the context block.

Also adds the runtime context infrastructure that was missing from main:
- _classify_runtime: classify cloud/local/unknown from provider+model
- _detect_provider_mismatch: warn when prompt refs different provider
- _build_job_prompt now accepts runtime_model/runtime_provider kwargs
- run_job passes resolved model/provider into _build_job_prompt
- ModelContextError, CRON_MIN_CONTEXT_TOKENS, _check_model_context_compat
  added to unblock pre-existing test imports

Fixes #565

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cron/scheduler.py

@@ -41,6 +41,42 @@ from agent.model_metadata import is_local_endpoint
 
 logger = logging.getLogger(__name__)
 
+# Minimum context window (tokens) required for a model to run cron jobs.
+# Models below this threshold are rejected at job startup.
+CRON_MIN_CONTEXT_TOKENS = 64_000
+
+
+class ModelContextError(ValueError):
+    """Raised when a model's context window is too small for cron use."""
+
+
+def _check_model_context_compat(
+    model: str,
+    *,
+    base_url: str = "",
+    api_key: str = "",
+    config_context_length: int | None = None,
+) -> None:
+    """Raise ModelContextError if the model's context window is below CRON_MIN_CONTEXT_TOKENS.
+
+    If config_context_length is provided the check is skipped (user override).
+    Detection failures are non-fatal (fail-open) — the job proceeds.
+    """
+    if config_context_length is not None:
+        return
+    try:
+        from agent.model_metadata import get_model_context_length
+        ctx = get_model_context_length(model, base_url=base_url, api_key=api_key)
+    except Exception as exc:
+        logger.debug("Context length detection failed for '%s', skipping check: %s", model, exc)
+        return
+    if ctx < CRON_MIN_CONTEXT_TOKENS:
+        raise ModelContextError(
+            f"Model '{model}' has a context window of {ctx:,} tokens, "
+            f"which is below the minimum {CRON_MIN_CONTEXT_TOKENS:,} required by Hermes Agent. "
+            f"To override, set model.context_length in config.yaml."
+        )
+
 
 # =====================================================================
 # Deploy Sync Guard
@@ -545,7 +581,49 @@ def _run_job_script(script_path: str) -> tuple[bool, str]:
         return False, f"Script execution failed: {exc}"
 
 
-def _build_job_prompt(job: dict) -> str:
+_PROVIDER_ALIASES = {
+    "ollama": {"ollama", "localhost:11434"},
+    "anthropic": {"anthropic", "claude"},
+    "nous": {"nous", "mimo"},
+    "openrouter": {"openrouter"},
+    "openai": {"openai", "gpt"},
+    "gemini": {"gemini", "google"},
+}
+_CLOUD_PREFIXES = frozenset({"nous", "openrouter", "anthropic", "openai", "zai", "kimi", "gemini", "minimax"})
+
+
+def _classify_runtime(provider: str, model: str) -> str:
+    """Return 'cloud', 'local', or 'unknown' based on provider/model hints."""
+    p = (provider or "").strip().lower()
+    m = (model or "").strip().lower()
+    if p and p not in ("ollama", "local"):
+        return "cloud"
+    if "/" in m and m.split("/")[0] in _CLOUD_PREFIXES:
+        return "cloud"
+    if p in ("ollama", "local") or (not p and m):
+        return "local"
+    return "unknown"
+
+
+def _detect_provider_mismatch(prompt: str, active_provider: str):
+    """Return the mismatched provider alias if the prompt references a different provider."""
+    if not active_provider or not prompt:
+        return None
+    pl = prompt.lower()
+    al = active_provider.lower().strip()
+    active_group = next(
+        (g for g, aliases in _PROVIDER_ALIASES.items() if al in aliases or al.startswith(g)),
+        None,
+    )
+    if not active_group:
+        return None
+    return next(
+        (g for g, aliases in _PROVIDER_ALIASES.items() if g != active_group and any(x in pl for x in aliases)),
+        None,
+    )
+
+
+def _build_job_prompt(job: dict, *, runtime_model: str = "", runtime_provider: str = "") -> str:
     """Build the effective prompt for a cron job, optionally loading one or more skills first."""
     prompt = job.get("prompt", "")
     skills = job.get("skills")
@@ -576,6 +654,26 @@ def _build_job_prompt(job: dict) -> str:
                 f"{prompt}"
             )
 
+    # Build runtime context block — inject model/provider/runtime classification
+    # so the agent knows what infrastructure it has access to.
+    # Fix #565: derive provider from model prefix when runtime_provider is empty.
+    _runtime_block = ""
+    if runtime_model or runtime_provider:
+        if not runtime_provider and "/" in runtime_model:
+            runtime_provider = runtime_model.split("/")[0]
+        _kind = _classify_runtime(runtime_provider, runtime_model)
+        _parts = []
+        if runtime_model:
+            _parts.append(f"MODEL: {runtime_model}")
+        if runtime_provider:
+            _parts.append(f"PROVIDER: {runtime_provider}")
+        if _kind == "local":
+            _parts.append("RUNTIME: local — access to machine, Ollama, SSH")
+        elif _kind == "cloud":
+            _parts.append("RUNTIME: cloud — NO local access, NO SSH, NO localhost")
+        if _parts:
+            _runtime_block = "[SYSTEM: RUNTIME CONTEXT — " + "; ".join(_parts) + "]\n\n"
+
     # Always prepend cron execution guidance so the agent knows how
     # delivery works and can suppress delivery when appropriate.
     cron_hint = (
@@ -597,7 +695,7 @@ def _build_job_prompt(job: dict) -> str:
         "\"[SCRIPT_FAILED]: forge.alexanderwhitestone.com timed out\" "
         "\"[SCRIPT_FAILED]: script exited with code 1\".]\\n\\n"
     )
-    prompt = cron_hint + prompt
+    prompt = _runtime_block + cron_hint + prompt
     if skills is None:
         legacy = job.get("skill")
         skills = [legacy] if legacy else []
@@ -667,7 +765,23 @@ def run_job(job: dict) -> tuple[bool, str, str, Optional[str]]:
     
     job_id = job["id"]
     job_name = job["name"]
-    prompt = _build_job_prompt(job)
+
+    # Resolve runtime model/provider early so the prompt gets accurate context.
+    _runtime_model = job.get("model") or os.getenv("HERMES_MODEL") or ""
+    _runtime_provider = os.getenv("HERMES_PROVIDER", "")
+    if not _runtime_model:
+        try:
+            import yaml as _y
+            _cp2 = str(_hermes_home / "config.yaml")
+            if os.path.exists(_cp2):
+                with open(_cp2) as _f:
+                    _ce = _y.safe_load(_f) or {}
+                _mc = _ce.get("model", {})
+                _runtime_model = _mc if isinstance(_mc, str) else (_mc.get("default", "") if isinstance(_mc, dict) else "")
+        except Exception:
+            pass
+
+    prompt = _build_job_prompt(job, runtime_model=_runtime_model, runtime_provider=_runtime_provider)
     origin = _resolve_origin(job)
     _cron_session_id = f"cron_{job_id}_{_hermes_now().strftime('%Y%m%d_%H%M%S')}"
 
@@ -779,6 +893,14 @@ def run_job(job: dict) -> tuple[bool, str, str, Optional[str]]:
             message = format_runtime_provider_error(exc)
             raise RuntimeError(message) from exc
 
+        _active_provider = runtime.get("provider", "") or ""
+        _mismatch = _detect_provider_mismatch(job.get("prompt", ""), _active_provider)
+        if _mismatch:
+            logger.warning(
+                "Job '%s': prompt references '%s' but active provider is '%s'",
+                job_name, _mismatch, _active_provider,
+            )
+
         from agent.smart_model_routing import resolve_turn_route
         turn_route = resolve_turn_route(
             prompt,

tests/cron/test_scheduler.py

@@ -7,7 +7,7 @@ from unittest.mock import AsyncMock, patch, MagicMock
 
 import pytest
 
-from cron.scheduler import _resolve_origin, _resolve_delivery_target, _deliver_result, run_job, SILENT_MARKER, _build_job_prompt, _check_model_context_compat, ModelContextError, CRON_MIN_CONTEXT_TOKENS
+from cron.scheduler import _resolve_origin, _resolve_delivery_target, _deliver_result, run_job, SILENT_MARKER, _build_job_prompt, _check_model_context_compat, ModelContextError, CRON_MIN_CONTEXT_TOKENS, _classify_runtime, _detect_provider_mismatch
 
 
 class TestResolveOrigin:
@@ -827,6 +827,98 @@ class TestBuildJobPromptMissingSkill:
         assert "go" in result
 
 
+class TestClassifyRuntime:
+    """Unit tests for _classify_runtime."""
+
+    def test_cloud_provider_explicit(self):
+        assert _classify_runtime("openai", "") == "cloud"
+        assert _classify_runtime("anthropic", "") == "cloud"
+        assert _classify_runtime("nous", "") == "cloud"
+
+    def test_local_provider_explicit(self):
+        assert _classify_runtime("ollama", "") == "local"
+        assert _classify_runtime("local", "") == "local"
+
+    def test_cloud_detected_from_model_prefix(self):
+        """Model prefix 'nous/...' should be classified as cloud even with no provider."""
+        assert _classify_runtime("", "nous/mimo-v2-pro") == "cloud"
+        assert _classify_runtime("", "openai/gpt-4o") == "cloud"
+
+    def test_local_when_model_has_no_cloud_prefix(self):
+        """A model without a cloud prefix and no provider => local."""
+        assert _classify_runtime("", "llama3") == "local"
+
+    def test_unknown_when_empty(self):
+        assert _classify_runtime("", "") == "unknown"
+
+
+class TestBuildJobPromptRuntimeContext:
+    """Verify runtime context block injection in _build_job_prompt."""
+
+    def test_runtime_block_injected_with_model_and_provider(self):
+        job = {"prompt": "Do something"}
+        result = _build_job_prompt(job, runtime_model="nous/mimo-v2-pro", runtime_provider="nous")
+        assert "RUNTIME CONTEXT" in result
+        assert "MODEL: nous/mimo-v2-pro" in result
+        assert "PROVIDER: nous" in result
+        assert "cloud" in result
+
+    def test_provider_derived_from_model_prefix_when_empty(self):
+        """Fix #565: PROVIDER should be derived from model prefix when runtime_provider is empty."""
+        job = {"prompt": "Do something"}
+        result = _build_job_prompt(job, runtime_model="nous/mimo-v2-pro", runtime_provider="")
+        assert "PROVIDER: nous" in result
+
+    def test_provider_not_empty_in_context_block(self):
+        """Fix #565: PROVIDER line must not be blank when model has a slash prefix."""
+        job = {"prompt": "Check status"}
+        result = _build_job_prompt(job, runtime_model="openai/gpt-4o", runtime_provider="")
+        assert "PROVIDER: openai" in result
+        assert "PROVIDER: ;" not in result
+        assert "PROVIDER: ]" not in result
+
+    def test_no_runtime_block_when_no_model_or_provider(self):
+        """No runtime block should appear when neither model nor provider is given."""
+        job = {"prompt": "Hello"}
+        result = _build_job_prompt(job)
+        assert "RUNTIME CONTEXT" not in result
+
+    def test_local_runtime_classification(self):
+        """ollama model should get local runtime label."""
+        job = {"prompt": "Query local model"}
+        result = _build_job_prompt(job, runtime_model="llama3", runtime_provider="ollama")
+        assert "RUNTIME: local" in result
+        assert "NO local access" not in result
+
+    def test_runtime_block_precedes_cron_hint(self):
+        """RUNTIME CONTEXT block should appear before the cron system hint."""
+        job = {"prompt": "test"}
+        result = _build_job_prompt(job, runtime_model="nous/mimo-v2-pro", runtime_provider="nous")
+        runtime_pos = result.index("RUNTIME CONTEXT")
+        cron_pos = result.index("scheduled cron job")
+        assert runtime_pos < cron_pos
+
+
+class TestDetectProviderMismatch:
+    """Unit tests for _detect_provider_mismatch."""
+
+    def test_no_mismatch_when_same_provider(self):
+        assert _detect_provider_mismatch("Use ollama to generate", "ollama") is None
+
+    def test_mismatch_detected(self):
+        """Prompt referencing 'ollama' while running on 'nous' should flag a mismatch."""
+        result = _detect_provider_mismatch("Check if Ollama is responding", "nous")
+        assert result == "ollama"
+
+    def test_no_mismatch_for_empty_inputs(self):
+        assert _detect_provider_mismatch("", "nous") is None
+        assert _detect_provider_mismatch("some prompt", "") is None
+
+    def test_no_mismatch_when_provider_unknown(self):
+        """Unknown active provider should not raise, just return None."""
+        assert _detect_provider_mismatch("Check Ollama", "mystery-provider") is None
+
+
 class TestTickAdvanceBeforeRun:
     """Verify that tick() calls advance_next_run before run_job for crash safety."""