feat: Add memory_apply_patch for non-Anthropic models (#149)

src/agent/create.ts

@@ -89,14 +89,44 @@ export async function createAgent(
     getServerToolName(name),
   );
 
+  const baseMemoryTool = modelHandle.startsWith("anthropic/")
+    ? "memory"
+    : "memory_apply_patch";
   const defaultBaseTools = baseTools ?? [
-    "memory",
+    baseMemoryTool,
     "web_search",
     "conversation_search",
     "fetch_webpage",
   ];
 
-  const toolNames = [...serverToolNames, ...defaultBaseTools];
+  let toolNames = [...serverToolNames, ...defaultBaseTools];
+
+  // Fallback: if server doesn't have memory_apply_patch, use legacy memory tool
+  if (toolNames.includes("memory_apply_patch")) {
+    try {
+      const resp = await client.tools.list({ name: "memory_apply_patch" });
+      const hasMemoryApplyPatch =
+        Array.isArray(resp.items) && resp.items.length > 0;
+      if (!hasMemoryApplyPatch) {
+        console.warn(
+          "memory_apply_patch tool not found on server; falling back to 'memory' tool",
+        );
+        toolNames = toolNames.map((n) =>
+          n === "memory_apply_patch" ? "memory" : n,
+        );
+      }
+    } catch (err) {
+      // If the capability check fails for any reason, conservatively fall back to 'memory'
+      console.warn(
+        `Unable to verify memory_apply_patch availability (falling back to 'memory'): ${
+          err instanceof Error ? err.message : String(err)
+        }`,
+      );
+      toolNames = toolNames.map((n) =>
+        n === "memory_apply_patch" ? "memory" : n,
+      );
+    }
+  }
 
   // Load memory blocks from .mdx files
   const defaultMemoryBlocks =
@@ -312,6 +342,8 @@ export async function createAgent(
     enable_sleeptime: enableSleeptime,
   });
 
+  // Note: Preflight check above falls back to 'memory' when 'memory_apply_patch' is unavailable.
+
   // Apply updateArgs if provided (e.g., reasoningEffort, verbosity, etc.)
   // Skip if updateArgs only contains context_window (already set in create)
   if (updateArgs && Object.keys(updateArgs).length > 0) {