fix: implement native Ollama thinking semantics

Model Ollama chat thinking separately from final content, preserve it only across assistant tool-call continuation, and keep private reasoning out of user results, session context, and logs.

Accept native boolean and low/medium/high/max think values, normalize YAML booleans, and serialize explicit overrides using the native top-level chat field.

Stop forcing think=false for structured planning, skill selection, and context summaries; corrected retries now retain the configured thinking mode.

Update the specification, design, audit report, and requirement traceability for OLL-14.

Add request/response, configuration, observability, retry, and tool-continuation coverage. Verified with 92 passing Agent.Core tests and a deepseek-v4-flash:cloud think:true MCP operational run.

1 files changed, 4 insertions, 3 deletions

diff --git a/src/Agent.Core/Ollama/OllamaModels.cs b/src/Agent.Core/Ollama/OllamaModels.cs
index f6ff092..9e6103e 100644
--- a/src/Agent.Core/Ollama/OllamaModels.cs
+++ b/src/Agent.Core/Ollama/OllamaModels.cs
@@ -9,7 +9,8 @@ public sealed record OllamaMessage(
     [property: JsonPropertyName("content")] string Content,
     [property: JsonPropertyName("images"), JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)] IReadOnlyList<string>? Images = null,
     [property: JsonPropertyName("tool_name"), JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)] string? ToolName = null,
-    [property: JsonPropertyName("tool_calls"), JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)] IReadOnlyList<OllamaToolCall>? ToolCalls = null);
+    [property: JsonPropertyName("tool_calls"), JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)] IReadOnlyList<OllamaToolCall>? ToolCalls = null,
+    [property: JsonPropertyName("thinking"), JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)] string? Thinking = null);
 
 public sealed record OllamaToolCall([property: JsonPropertyName("function")] OllamaFunctionCall Function);
 public sealed record OllamaFunctionCall(
@@ -29,7 +30,7 @@ public sealed class OllamaChatRequest
     [JsonPropertyName("model")] public required string Model { get; init; }
     [JsonPropertyName("messages")] public required IReadOnlyList<OllamaMessage> Messages { get; init; }
     [JsonPropertyName("stream")] public bool Stream { get; init; }
-    [JsonPropertyName("think")] public bool Think { get; init; }
+    [JsonPropertyName("think")] public required object Think { get; init; }
     [JsonPropertyName("keep_alive")] public required string KeepAlive { get; init; }
     [JsonPropertyName("options")] public required IReadOnlyDictionary<string, System.Text.Json.JsonElement> Options { get; init; }
     [JsonPropertyName("tools"), JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)] public IReadOnlyList<OllamaToolDefinition>? Tools { get; init; }
@@ -44,4 +45,4 @@ public sealed class OllamaChatResponse
     [JsonPropertyName("error")] public string? Error { get; init; }
 }
 
-public sealed record OllamaResult(string Content, long InputTokens, long OutputTokens, IReadOnlyList<OllamaToolCall>? ToolCalls = null, long PromptEvalCount = 0);
+public sealed record OllamaResult(string Content, long InputTokens, long OutputTokens, IReadOnlyList<OllamaToolCall>? ToolCalls = null, long PromptEvalCount = 0, string? Thinking = null);