log: honour fastagent.config.yaml logger.level so one knob controls Pallas + fast-agent

pallas/log.py

@@ -20,6 +20,7 @@ import logging
 import os
 import re
 from datetime import datetime, timezone
+from pathlib import Path
 
 
 class _JSONFormatter(logging.Formatter):
@@ -68,21 +69,55 @@ class _HealthAccessFilter(logging.Filter):
         return True
 
 
+def _level_from_fastagent_config() -> str | None:
+    """Return the ``logger.level`` string from ``fastagent.config.yaml`` if set.
+
+    We intentionally parse the YAML by hand (rather than importing fast-agent's
+    config loader) because ``setup_logging`` runs *before* fast-agent is
+    initialised — importing its config machinery here would reverse the
+    bootstrap order and swallow our first few log lines.
+    """
+    cfg_path = Path.cwd() / "fastagent.config.yaml"
+    if not cfg_path.exists():
+        return None
+    try:
+        import yaml
+
+        with open(cfg_path) as fh:
+            data = yaml.safe_load(fh) or {}
+    except Exception:
+        return None
+    logger_cfg = data.get("logger") or {}
+    level = logger_cfg.get("level")
+    return str(level) if level else None
+
+
 def setup_logging() -> None:
     """Configure Pallas logging.
 
-    - ``pallas.*`` logger: INFO by default, JSON to stdout.  Override via the
-      ``PALLAS_LOG_LEVEL`` environment variable (``DEBUG``, ``INFO``,
-      ``WARNING``, ``ERROR``).  DEBUG unlocks bearer-forwarding diagnostics
-      on the ``pallas.forward`` and ``pallas.auth`` loggers — essential when
-      troubleshooting Mnemosyne / workspace-scoped agent calls.
+    Log level resolution order (first match wins):
+
+      1. ``PALLAS_LOG_LEVEL`` environment variable — explicit override.
+      2. ``logger.level`` in ``fastagent.config.yaml`` — unified control knob
+         so bumping fast-agent's level also flips on Pallas's bearer-forwarding
+         diagnostics.
+      3. ``INFO``.
+
+    ``DEBUG`` unlocks diagnostics on the ``pallas.forward`` and
+    ``pallas.auth`` loggers — essential when troubleshooting Mnemosyne /
+    workspace-scoped agent calls.
+
     - ``httpx`` / ``httpcore``: WARNING (prevent request-level debug flooding)
     - ``uvicorn.access``: health path filter applied
     """
     handler = logging.StreamHandler()
     handler.setFormatter(_JSONFormatter())
 
-    level_name = os.environ.get("PALLAS_LOG_LEVEL", "INFO").upper()
+    level_name = (
+        os.environ.get("PALLAS_LOG_LEVEL")
+        or _level_from_fastagent_config()
+        or "INFO"
+    ).upper()
     level = getattr(logging, level_name, logging.INFO)
 
     pallas_logger = logging.getLogger("pallas")