fix: add langgraph runtime compatibility shim for prebuilt tools

src/open_storyline/agent.py

@@ -5,6 +5,10 @@
 
 import httpx
 
+from open_storyline.compat.langgraph_runtime import ensure_langgraph_runtime_compat
+
+ensure_langgraph_runtime_compat()
+
 from langchain.agents import create_agent
 from langchain_openai import ChatOpenAI
 
@@ -239,4 +243,4 @@ def _norm_url(u: str) -> str:
         store=store,
         context_schema=ClientContext,
     )
-    return agent, node_manager
+    return agent, node_manager

src/open_storyline/compat/langgraph_runtime.py

@@ -0,0 +1,41 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+
+def ensure_langgraph_runtime_compat() -> None:
+    """Backfill runtime symbols expected by newer langgraph-prebuilt.
+
+    Some dependency combinations expose only ``Runtime`` in ``langgraph.runtime``,
+    while newer ``langgraph-prebuilt`` imports ``ExecutionInfo`` and ``ServerInfo``
+    for type annotations. These placeholders are sufficient because the symbols are
+    not used for runtime behavior in this project path.
+    """
+
+    try:
+        import langgraph.runtime as runtime_mod  # type: ignore
+    except Exception:
+        return
+
+    if not hasattr(runtime_mod, "ExecutionInfo"):
+        @dataclass
+        class ExecutionInfo:  # pragma: no cover - compatibility shim
+            pass
+
+        runtime_mod.ExecutionInfo = ExecutionInfo  # type: ignore[attr-defined]
+
+    if not hasattr(runtime_mod, "ServerInfo"):
+        @dataclass
+        class ServerInfo:  # pragma: no cover - compatibility shim
+            pass
+
+        runtime_mod.ServerInfo = ServerInfo  # type: ignore[attr-defined]
+
+    # Newer langgraph-prebuilt accesses runtime.execution_info/server_info.
+    # Older langgraph Runtime does not define them, so add class-level fallbacks.
+    runtime_cls = getattr(runtime_mod, "Runtime", None)
+    if runtime_cls is not None:
+        if not hasattr(runtime_cls, "execution_info"):
+            setattr(runtime_cls, "execution_info", None)
+        if not hasattr(runtime_cls, "server_info"):
+            setattr(runtime_cls, "server_info", None)

src/open_storyline/skills/skills_io.py

@@ -1,9 +1,13 @@
 
-
 import aiofiles
 from pathlib import Path
 from skillkit import SkillManager
 from skillkit.integrations.langchain import create_langchain_tools
+
+from open_storyline.compat.langgraph_runtime import ensure_langgraph_runtime_compat
+
+ensure_langgraph_runtime_compat()
+
 from langchain.agents import create_agent
 from langchain_openai import ChatOpenAI
 from langchain.messages import HumanMessage