Caching MCP server tool results with anthropic?

[s-h-a-d-o-w]

I tried doing it like this, since I saw providerOptions in the return type of .tools() but no option to provide it to tools() itself:

  const rawTools = await mcpClientFilesystem.tools();
  const tools = Object.fromEntries(
    Object.entries(rawTools).map(([name, tool]) => {
      return [
        name,
        {
          ...tool,
          providerOptions: {
            anthropic: { cacheControl: { type: "ephemeral" } },
          },
        },
      ];
    }),
  );

But this results in:

{"type":"error","error":{"type":"invalid_request_error","message":"A maximum of 4 blocks with cache_control may be provided. Found 13."}}