ai-agent-book 精选快照（<2MB 代码与文档，来自 github.com/bojieli/ai-agent-book）

chapter9/self-modifying-agent/validation/real_20260802T043954Z/candidates/deterministic/retry_policy.py

@@ -0,0 +1,20 @@
+"""Stable version 1.0.0. It intentionally contains the reproduced bug."""
+
+VERSION = "1.1.0-candidate"
+MAX_RETRIES = 3
+CIRCUIT_BREAKER_THRESHOLD = 5
+NON_RETRYABLE_CODES = {"AUTH_DENIED", "INVALID_ARGUMENT", "PAYMENT_DECLINED"}
+
+
+def should_retry(error_code, retryable, attempt):
+    """Return whether another tool call should be attempted."""
+    if not retryable or error_code in NON_RETRYABLE_CODES:
+        return False
+    return attempt < MAX_RETRIES
+
+
+def should_open_circuit(consecutive_failures, *, error_code="", retryable=True):
+    """Open immediately for permanent errors; otherwise use the threshold."""
+    if not retryable or error_code in NON_RETRYABLE_CODES:
+        return consecutive_failures >= 1
+    return consecutive_failures >= CIRCUIT_BREAKER_THRESHOLD