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Avoid semantic blank Kimi bridge

ober

c2c7ea4149210a1d686afb525fbd856738c2ca19

diff --git a/src/jcode/provider/provider.ss b/src/jcode/provider/provider.ss
index cbeda7c..7bb9140 100644
--- a/src/jcode/provider/provider.ss
+++ b/src/jcode/provider/provider.ss
@@ -1601,7 +1601,7 @@
       (hash-put! j "content"
                  (if (message-tool-calls msg)
                    "Calling tool."
-                   "Tool call required.")))
+                   " ")))
     j))
 
 ;; Some models reject the `tools` parameter entirely (e.g. DeepSeek's
diff --git a/test/run.ss b/test/run.ss
index 14a9eb6..268c72a 100644
--- a/test/run.ss
+++ b/test/run.ss
@@ -10234,7 +10234,7 @@
                 (and req (str-contains? req "\"content\":\"Calling tool.\""))
                 #t)
         (check! "Kimi K3 blank assistant history has non-empty content"
-                (and req (str-contains? req "\"content\":\"Tool call required.\""))
+                (and req (str-contains? req "\"content\":\" \""))
                 #t)))
     (lambda () (tcp-close srv))))