diff --git a/packages/provider-pi/src/server/mcpExtensionSource.test.ts b/packages/provider-pi/src/server/mcpExtensionSource.test.ts
index c4119157a0175..6a909f4e374f9 100644
--- a/packages/provider-pi/src/server/mcpExtensionSource.test.ts
+++ b/packages/provider-pi/src/server/mcpExtensionSource.test.ts
@@ -387,9 +387,12 @@ describe("Pi tool discovery permissions", () => {
         },
       },
     };
-    assert.isUndefined(
-      await toolCall!({ toolName: "tool_search", input: { query: "preview_snapshot" } }, ctx),
-    );
+    for (const builtinPath of ["builtin:tool-search", "<builtin:tool-search>"]) {
+      searchPath = builtinPath;
+      assert.isUndefined(
+        await toolCall!({ toolName: "tool_search", input: { query: "preview_snapshot" } }, ctx),
+      );
+    }
     assert.equal(confirmations.length, 0);
     const result = await toolCall!({ toolName: "mcp__t3-code__preview_snapshot", input: {} }, ctx);
     assert.equal(result?.block, true);
diff --git a/packages/provider-pi/src/server/mcpExtensionSource.ts b/packages/provider-pi/src/server/mcpExtensionSource.ts
index 48aeff24370de..0f137d0f4d4d0 100644
--- a/packages/provider-pi/src/server/mcpExtensionSource.ts
+++ b/packages/provider-pi/src/server/mcpExtensionSource.ts
@@ -343,9 +343,11 @@ export default async function t3McpExtension(pi: ExtensionAPI) {
   // keep their normal meaning without replacing or shadowing Pi's runtime.
   // Only Pi's own search is known to be read-only. An extension that replaces
   // it keeps the name, and cannot discover deferred tools either.
+  // OmO reports Pi's builtin search with angle brackets around the same path.
+  const BUILTIN_TOOL_SEARCH_PATHS = new Set(["builtin:tool-search", "<builtin:tool-search>"]);
   const hasBuiltinToolSearch = () =>
     typeof pi.getAllTools === "function" &&
-    pi.getAllTools().some((tool) => tool.name === "tool_search" && tool.sourceInfo?.path === "builtin:tool-search");
+    pi.getAllTools().some((tool) => tool.name === "tool_search" && BUILTIN_TOOL_SEARCH_PATHS.has(tool.sourceInfo?.path ?? ""));
 
   const readOnlyMcpTools = new Set<string>();
   const isReadOnlyMcpTool = (name: string) => {