after moving all to cipher

worker-toolkit-stocks-in-the-future/explore/scripts/lib/harness_registry.py

@@ -36,6 +36,11 @@ class Harness:
     seed_native: bool
     seed_atif: bool
     agent_import_path_single_turn: str | None = None
+    # Browser-opt-in variants (`[metadata] browser = true`). A harness that has no variant
+    # keeps its normal class: codex, for instance, gains the browser and its disclosure but
+    # has no `Read` equivalent to switch toolsets for.
+    agent_import_path_browser: str | None = None
+    agent_import_path_single_turn_browser: str | None = None
     import_path_aliases: tuple[str, ...] = ()
     legacy_bare_model_rows: bool = False
     default_model: str | None = None
@@ -67,9 +72,22 @@ class Harness:
     # be edited in lockstep with the schema.
     extra: dict = field(default_factory=dict, compare=False)
 
-    def agent_import_path_for(self, *, multi_turn: bool) -> str:
+    def agent_import_path_for(self, *, multi_turn: bool, browser: bool = False) -> str:
         """Agent class to launch. Multi-turn tasks need the resuming class; a
-        single-turn task given it would try to resume a session that isn't there."""
+        single-turn task given it would try to resume a session that isn't there.
+
+        ``browser`` selects the opt-in variant, which for claude also carries the ``Read``
+        built-in — a different toolset is a different agent, so it is a different class with
+        its own name rather than a flag on the canonical one. Harnesses without a variant fall
+        through to their normal class."""
+        if browser:
+            variant = (
+                self.agent_import_path_browser
+                if multi_turn
+                else (self.agent_import_path_single_turn_browser or self.agent_import_path_browser)
+            )
+            if variant:
+                return variant
         if multi_turn:
             return self.agent_import_path
         return self.agent_import_path_single_turn or self.agent_import_path
@@ -180,6 +198,8 @@ _KNOWN_FIELDS = frozenset(
         "label",
         "agent_import_path",
         "agent_import_path_single_turn",
+        "agent_import_path_browser",
+        "agent_import_path_single_turn_browser",
         "import_path_aliases",
         "legacy_bare_model_rows",
         "default_model",
@@ -315,6 +335,8 @@ def _build(entry: dict, index: int) -> Harness:
         label=entry["label"],
         agent_import_path=entry["agent_import_path"],
         agent_import_path_single_turn=entry.get("agent_import_path_single_turn"),
+        agent_import_path_browser=entry.get("agent_import_path_browser"),
+        agent_import_path_single_turn_browser=entry.get("agent_import_path_single_turn_browser"),
         import_path_aliases=tuple(entry.get("import_path_aliases", ())),
         legacy_bare_model_rows=bool(entry.get("legacy_bare_model_rows", False)),
         default_model=entry.get("default_model"),