fix: Agent交互优化

AgentTest/AgentEngineLogicTests.cs

@@ -34,8 +34,8 @@ namespace AgentTest
         {
             var cfg = new AgentConfig();
 
-            Assert.Equal(32768, cfg.MaxTokens, "默认输出上限应为原默认值的 4 倍");
-            Assert.Equal(128000, cfg.MaxContextTokens, "默认上下文预算应为原默认值的 4 倍");
+            Assert.Equal(16384, cfg.MaxTokens, "默认输出上限应调整为兼容值");
+            Assert.Equal(64000, cfg.MaxContextTokens, "默认上下文预算应调整为兼容值");
             Assert.True(cfg.EnableOptionalTools, "可选能力默认应启用");
         }
 
@@ -50,8 +50,28 @@ namespace AgentTest
             Assert.Contains(schema, "doc_export", "默认工具应包含文档导出");
         }
 
+        [Test]
+        public void NormalizeMessageContents_ConvertsInvalidTypes_AndKeepsLists()
+        {
+            var original = new JArray
+            {
+                new JObject { ["role"] = "user", ["content"] = JValue.CreateNull() },
+                new JObject { ["role"] = "assistant", ["content"] = new JObject { ["value"] = "legacy" } },
+                new JObject { ["role"] = "user", ["content"] = new JArray { new JObject { ["type"] = "text", ["text"] = "图片问题" } } },
+            };
+
+            var normalized = OpenAiCompatibleClient.NormalizeMessageContents(original);
+
+            Assert.Equal(JTokenType.String, normalized[0]["content"]?.Type, "null content 应转为空字符串");
+            Assert.Equal("", normalized[0]["content"]?.Value<string>());
+            Assert.Equal(JTokenType.String, normalized[1]["content"]?.Type, "对象 content 应转为字符串");
+            Assert.Equal(JTokenType.Array, normalized[2]["content"]?.Type, "合法多模态 content 数组应保留");
+            Assert.Equal(JTokenType.Null, original[0]["content"]?.Type, "规范化不应修改原始消息");
+        }
+
         // ── token 估算 ──
 
+
         [Test]
         public void EstimateTokens_Text_CjkAndAscii()
         {

AppHome/Tools.Agent.xml

@@ -61,7 +61,7 @@
             </summary>
         </member>
         <member name="F:Tools.MyAgent.Agent.AgentEngine._contextTokens">
-            <summary>上下文 token 预算（由配置注入；默认 128000）</summary>
+            <summary>上下文 token 预算（由配置注入；默认 64000）</summary>
         </member>
         <member name="F:Tools.MyAgent.Agent.AgentEngine.MaxToolReturnChars">
             <summary>工具结果回填模型的字符上限（#42：超限压缩 + 完整结果落盘）。

Tools.Agent/Agent/AgentEngine.cs

@@ -28,7 +28,7 @@ namespace Tools.MyAgent.Agent
         private CancellationTokenSource _cts;
         private int _disposeStarted;
 
-        /// <summary>上下文 token 预算（由配置注入；默认 128000）</summary>
+        /// <summary>上下文 token 预算（由配置注入；默认 64000）</summary>
         private int _contextTokens = AgentConfig.DefaultMaxContextTokens;
 
         // #31 故障转移
@@ -194,8 +194,12 @@ namespace Tools.MyAgent.Agent
             _client.ApiKey = cfg.ApiKey ?? "";
             _client.Model = string.IsNullOrEmpty(cfg.Model) ? "deepseek-v4-flash" : cfg.Model;
             _client.Temperature = cfg.Temperature;
-            _client.MaxTokens = cfg.MaxTokens > 0 ? cfg.MaxTokens : AgentConfig.DefaultMaxTokens;
-            _contextTokens = cfg.MaxContextTokens > 0 ? cfg.MaxContextTokens : AgentConfig.DefaultMaxContextTokens;
+            _client.MaxTokens = cfg.MaxTokens > 0
+                ? Math.Min(cfg.MaxTokens, AgentConfig.MaxAllowedTokens)
+                : AgentConfig.DefaultMaxTokens;
+            _contextTokens = cfg.MaxContextTokens > 0
+                ? Math.Min(cfg.MaxContextTokens, AgentConfig.MaxAllowedContextTokens)
+                : AgentConfig.DefaultMaxContextTokens;
             // R12：策略参数（越界回退默认，防止手改配置文件导致异常行为）
             _maxToolRounds = ClampStrategy(cfg.MaxToolRounds, 1, 50, 15);
             _maxHistoryMessages = ClampStrategy(cfg.MaxHistoryMessages, 3, 200, 60);
@@ -299,7 +303,7 @@ namespace Tools.MyAgent.Agent
                     foreach (var tc in result.ToolCalls)
                     {
                         _cts.Token.ThrowIfCancellationRequested();
-                        string toolResult = await ExecuteToolAsync(tc, _cts.Token).ConfigureAwait(false);
+                        string toolResult = await ExecuteToolAsync(tc, _cts.Token).ConfigureAwait(false) ?? "";
                         messages.Add(new JObject
                         {
                             ["role"] = "tool",
@@ -971,7 +975,7 @@ namespace Tools.MyAgent.Agent
                 // #29 工具日志
                 AgentLogger.LogTool(tc.Name, desc, sw.ElapsedMilliseconds, SummarizeToolResult(result));
                 // #42 结果压缩：超长结果压缩后回填模型，完整结果落盘供溯源
-                result = CompressToolResult(result, tc.Name);
+                result = CompressToolResult(result, tc.Name) ?? "";
                 if (gen == System.Threading.Volatile.Read(ref _runGeneration))
                 {
                     lock (_toolTrace)

Tools.Agent/Agent/OpenAiCompatibleClient.cs

@@ -243,6 +243,24 @@ namespace Tools.MyAgent.Agent
             }
         }
 
+        internal static JArray NormalizeMessageContents(JArray messages)
+        {
+            var normalized = messages == null ? new JArray() : (JArray)messages.DeepClone();
+            foreach (var message in normalized.OfType<JObject>())
+            {
+                var content = message["content"];
+                if (content == null || content.Type == JTokenType.Null)
+                {
+                    message["content"] = "";
+                }
+                else if (content.Type != JTokenType.String && content.Type != JTokenType.Array)
+                {
+                    message["content"] = content.ToString(Formatting.None);
+                }
+            }
+            return normalized;
+        }
+
         /// <summary>
         /// 发起一次流式补全，返回最终结果（正文 / 推理 / 工具调用）。
         /// <para>对 429 / 5xx / 连接超时 / 流中断做指数退避 + 抖动重试（最多 2 次），最终失败才抛出。</para>
@@ -253,7 +271,7 @@ namespace Tools.MyAgent.Agent
             var body = new JObject
             {
                 ["model"] = Model,
-                ["messages"] = messages,
+                ["messages"] = NormalizeMessageContents(messages),
                 ["stream"] = true,
                 ["max_tokens"] = MaxTokens,
             };
@@ -485,7 +503,7 @@ namespace Tools.MyAgent.Agent
             var body = new JObject
             {
                 ["model"] = Model,
-                ["messages"] = messages,
+                ["messages"] = NormalizeMessageContents(messages),
                 ["stream"] = false,
                 ["max_tokens"] = maxTokens,
             };

Tools.Agent/Config/AgentConfig.cs

@@ -10,8 +10,10 @@
     public sealed class AgentConfig
     {
         public const double DefaultTemperature = 0.3;
-        public const int DefaultMaxTokens = 32768;
-        public const int DefaultMaxContextTokens = 128000;
+        public const int DefaultMaxTokens = 16384;
+        public const int MaxAllowedTokens = 32768;
+        public const int DefaultMaxContextTokens = 64000;
+        public const int MaxAllowedContextTokens = 200000;
 
         // ════════════════ 核心项（主设置页） ════════════════
 

Tools.Agent/Forms/AgentSettingsForm.Designer.cs

@@ -554,7 +554,7 @@
             0});
             this.numMaxTokens.Location = new System.Drawing.Point(384, 28);
             this.numMaxTokens.Maximum = new decimal(new int[] {
-            65536,
+            32768,
             0,
             0,
             0});
@@ -567,7 +567,7 @@
             this.numMaxTokens.Size = new System.Drawing.Size(96, 23);
             this.numMaxTokens.TabIndex = 4;
             this.numMaxTokens.Value = new decimal(new int[] {
-            32768,
+            16384,
             0,
             0,
             0});
@@ -590,7 +590,7 @@
             0});
             this.numContext.Location = new System.Drawing.Point(92, 60);
             this.numContext.Maximum = new decimal(new int[] {
-            800000,
+            200000,
             0,
             0,
             0});
@@ -603,7 +603,7 @@
             this.numContext.Size = new System.Drawing.Size(96, 23);
             this.numContext.TabIndex = 6;
             this.numContext.Value = new decimal(new int[] {
-            128000,
+            64000,
             0,
             0,
             0});