fix(agents): only models that send progress updates read thinking as progress

src/beaver_gateway/agents/claude.py

@@ -17,7 +17,10 @@ from beaver_gateway.agents.policy import PolicyRule  # noqa: TC001
 from beaver_gateway.agents.prompts import PromptSource  # noqa: TC001
 from beaver_gateway.conversations.kinds import KINDS, Kind
 
-__all__ = ["ClaudeAgent", "ClaudeOptions", "Prompts", "SkillSets"]
+__all__ = ["PROGRESS_MODELS", "ClaudeAgent", "ClaudeOptions", "Prompts", "SkillSets"]
+
+PROGRESS_MODELS = frozenset({"claude-opus-5-5", "claude-fable-5-1"})
+"""Models whose non-empty thinking is the text written between tool calls."""
 
 
 class ClaudeOptions(BaseModel):
@@ -123,8 +126,9 @@ class ClaudeAgent(BaseAgent):
 
     @property
     def thinking_is_progress(self) -> bool:
-        """Reasoning arrives empty unless ``display`` is ``summarized``."""
-        return (self.options.thinking or {}).get("display") != "summarized"
+        """A progress model, unless ``display: summarized`` brings reasoning."""
+        summarized = (self.options.thinking or {}).get("display") == "summarized"
+        return self.model in PROGRESS_MODELS and not summarized
 
     def prompt_for(self, kind: Kind) -> tuple[PromptSource, ...] | None:
         return self.prompts.for_kind(kind)