diff --git a/api/core/tools/provider/builtin/chart/tools/bar.yaml b/api/core/tools/provider/builtin/chart/tools/bar.yaml
index bc34f2a5ec..ee7405f681 100644
--- a/api/core/tools/provider/builtin/chart/tools/bar.yaml
+++ b/api/core/tools/provider/builtin/chart/tools/bar.yaml
@@ -21,9 +21,9 @@ parameters:
       zh_Hans: 数据
       pt_BR: dados
     human_description:
-      en_US: data for generating bar chart
-      zh_Hans: 用于生成柱状图的数据
-      pt_BR: dados para gerar gráfico de barras
+      en_US: data for generating chart, each number should be separated by ";"
+      zh_Hans: 用于生成柱状图的数据，每个数字之间用 ";" 分隔
+      pt_BR: dados para gerar gráfico de barras, cada número deve ser separado por ";"
     llm_description: data for generating bar chart, data should be a string contains a list of numbers like "1;2;3;4;5"
     form: llm
   - name: x_axis
@@ -34,8 +34,8 @@ parameters:
       zh_Hans: x 轴
       pt_BR: Eixo X
     human_description:
-      en_US: X axis for bar chart
-      zh_Hans: 柱状图的 x 轴
-      pt_BR: Eixo X para gráfico de barras
+      en_US: X axis for chart, each text should be separated by ";"
+      zh_Hans: 柱状图的 x 轴，每个文本之间用 ";" 分隔
+      pt_BR: Eixo X para gráfico de barras, cada texto deve ser separado por ";"
     llm_description: x axis for bar chart, x axis should be a string contains a list of texts like "a;b;c;1;2" in order to match the data
     form: llm
diff --git a/api/core/tools/provider/builtin/chart/tools/line.yaml b/api/core/tools/provider/builtin/chart/tools/line.yaml
index 9994cbb80b..35ebe3b68b 100644
--- a/api/core/tools/provider/builtin/chart/tools/line.yaml
+++ b/api/core/tools/provider/builtin/chart/tools/line.yaml
@@ -21,9 +21,9 @@ parameters:
       zh_Hans: 数据
       pt_BR: dados
     human_description:
-      en_US: data for generating linear chart
-      zh_Hans: 用于生成线性图表的数据
-      pt_BR: dados para gerar gráfico linear
+      en_US: data for generating chart, each number should be separated by ";"
+      zh_Hans: 用于生成线性图表的数据，每个数字之间用 ";" 分隔
+      pt_BR: dados para gerar gráfico linear, cada número deve ser separado por ";"
     llm_description: data for generating linear chart, data should be a string contains a list of numbers like "1;2;3;4;5"
     form: llm
   - name: x_axis
@@ -34,8 +34,8 @@ parameters:
       zh_Hans: x 轴
       pt_BR: Eixo X
     human_description:
-      en_US: X axis for linear chart
-      zh_Hans: 线性图表的 x 轴
-      pt_BR: Eixo X para gráfico linear
+      en_US: X axis for chart, each text should be separated by ";"
+      zh_Hans: 线性图表的 x 轴，每个文本之间用 ";" 分隔
+      pt_BR: Eixo X para gráfico linear, cada texto deve ser separado por ";"
     llm_description: x axis for linear chart, x axis should be a string contains a list of texts like "a;b;c;1;2" in order to match the data
     form: llm
diff --git a/api/core/tools/provider/builtin/chart/tools/pie.yaml b/api/core/tools/provider/builtin/chart/tools/pie.yaml
index 7d6647ef4a..541715cb7d 100644
--- a/api/core/tools/provider/builtin/chart/tools/pie.yaml
+++ b/api/core/tools/provider/builtin/chart/tools/pie.yaml
@@ -21,9 +21,9 @@ parameters:
       zh_Hans: 数据
       pt_BR: dados
     human_description:
-      en_US: data for generating pie chart
-      zh_Hans: 用于生成饼图的数据
-      pt_BR: dados para gerar gráfico de pizza
+      en_US: data for generating chart, each number should be separated by ";"
+      zh_Hans: 用于生成饼图的数据，每个数字之间用 ";" 分隔
+      pt_BR: dados para gerar gráfico de pizza, cada número deve ser separado por ";"
     llm_description: data for generating pie chart, data should be a string contains a list of numbers like "1;2;3;4;5"
     form: llm
   - name: categories
@@ -34,8 +34,8 @@ parameters:
       zh_Hans: 分类
       pt_BR: Categorias
     human_description:
-      en_US: Categories for pie chart
-      zh_Hans: 饼图的分类
-      pt_BR: Categorias para gráfico de pizza
+      en_US: Categories for chart, each category should be separated by ";"
+      zh_Hans: 饼图的分类，每个分类之间用 ";" 分隔
+      pt_BR: Categorias para gráfico de pizza, cada categoria deve ser separada por ";"
     llm_description: categories for pie chart, categories should be a string contains a list of texts like "a;b;c;1;2" in order to match the data, each category should be split by ";"
     form: llm