feat(evaluators): add starts_with/ends_with mode to list evaluator

evaluators/README.md

@@ -19,9 +19,14 @@ Pattern matching for text (PII, keywords, SQL injection)
 ```
 
 ### List
-Match against value lists (blocked users, restricted cities)
+Match against value lists (blocked users, restricted cities, allowed prefixes).
+Supports `match_mode: "exact"` for full-string membership, `match_mode: "contains"`
+for keyword-style matching, `match_mode: "starts_with"` for prefix matching, and
+`match_mode: "ends_with"` for suffix matching.
 ```python
 {"name": "list", "config": {"values": ["admin", "root"], "case_sensitive": False}}
+{"name": "list", "config": {"values": ["/home/lev/agent-control"], "match_mode": "starts_with"}}
+{"name": "list", "config": {"values": [".md"], "match_mode": "ends_with"}}
 ```
 
 ### SQL

evaluators/builtin/src/agent_control_evaluators/list/config.py

@@ -19,9 +19,12 @@ class ListEvaluatorConfig(EvaluatorConfig):
     match_on: Literal["match", "no_match"] = Field(
         "match", description="Trigger rule on match or no match"
     )
-    match_mode: Literal["exact", "contains"] = Field(
+    match_mode: Literal["exact", "contains", "starts_with", "ends_with"] = Field(
         "exact",
-        description="'exact' for full string match, 'contains' for keyword/substring match",
+        description=(
+            "'exact' for full string match, 'contains' for keyword matching, "
+            "'starts_with' for prefix matching, and 'ends_with' for suffix matching"
+        ),
     )
     case_sensitive: bool = Field(False, description="Whether matching is case sensitive")
 

evaluators/builtin/src/agent_control_evaluators/list/evaluator.py

@@ -18,7 +18,7 @@ class ListEvaluator(Evaluator[ListEvaluatorConfig]):
     Checks if data matches values in a list. Supports:
     - any/all logic (match any value vs match all values)
     - match/no_match trigger (trigger on match or no match)
-    - exact/contains mode (full match vs substring/keyword)
+    - exact/contains/starts_with/ends_with mode (full match vs keyword vs prefix/suffix)
     - case sensitivity toggle
 
     Example configs:
@@ -50,6 +50,12 @@ def _build_regex(self) -> Any:
         if self.config.match_mode == "contains":
             # Word boundary matching for substring/keyword detection
             pattern = f"\\b({'|'.join(escaped)})\\b"
+        elif self.config.match_mode == "starts_with":
+            # Prefix matching using anchors
+            pattern = f"^({'|'.join(escaped)})"
+        elif self.config.match_mode == "ends_with":
+            # Suffix matching using anchors
+            pattern = f"({'|'.join(escaped)})$"
         else:
             # Exact match using anchors
             pattern = f"^({'|'.join(escaped)})$"