Fix linux arm64 MCP client build

ober

d984b606e2d515242da2cfe44ad19c10e5078c43

diff --git a/src/jcode/mcp/client.ss b/src/jcode/mcp/client.ss
index df90e24..a59263c 100644
--- a/src/jcode/mcp/client.ss
+++ b/src/jcode/mcp/client.ss
@@ -88,8 +88,8 @@
 (def (record-mcp-call! conn method id params started-ms status result error-text)
   (let* ((rec (make-hash-table))
          (duration (- (current-time-ms) started-ms))
-         (tool-name (and (hash-table? params) (hash-get params "name" #f)))
-         (args (and (hash-table? params) (hash-get params "arguments" #f))))
+         (tool-name (and (hash-table? params) (hash-ref params "name" #f)))
+         (args (and (hash-table? params) (hash-ref params "arguments" #f))))
     (hash-put! rec "server" (mcp-conn-name conn))
     (hash-put! rec "method" method)
     (hash-put! rec "id" id)