refactor: Move to agent architecture

sources/agents/ollama_base_chat.toml

@@ -1,44 +1,52 @@
 schema_version = 1
 
 name        = "Ollama Base Chat"
-description = "Shared base for Ollama /api/chat profiles."
-
-abstract = true
+description = "Ollama native /api/chat request body. Abstract — extend it and set model."
+abstract    = true
 
 provider_instance = "Ollama (Native)"
 endpoint          = "/api/chat"
 
-tags = ["ollama", "local"]
-
-[template]
-message_format = """
-{
-  "messages": [
-    {%- if existsIn(ctx, "system_prompt") %}
-    {
-      "role": "system",
-      "content": {{ tojson(ctx.system_prompt) }}
-    }{% if length(ctx.history) > 0 %},{% endif %}
-    {%- endif %}
-    {%- for msg in ctx.history %}
-    {
-      "role": {{ tojson(msg.role) }},
-      "content": {{ tojson(msg.content) }}{% if existsIn(msg, "images") %},
-      "images": [
-        {%- for img in msg.images %}
-        {{ tojson(img.data) }}{% if not loop.is_last %},{% endif %}
-        {%- endfor %}
-      ]{% endif %}
-    }{% if not loop.is_last %},{% endif %}
-    {%- endfor %}
-  ]
-}
-"""
-
-[template.sampling]
+[body]
 stream = true
-
-[template.sampling.options]
-num_predict = 2048
-temperature = 0.7
-keep_alive  = "5m"
+messages = """
+[
+{% if existsIn(ctx, "system_prompt") %}
+{ "role": "system", "content": {{ tojson(ctx.system_prompt) }} },
+{% endif %}
+{% for msg in ctx.history %}
+  {% set tcalls = filter_by_type(msg.content_blocks, "tool_use") %}
+  {% set tresults = filter_by_type(msg.content_blocks, "tool_result") %}
+  {% if length(tresults) > 0 %}
+    {% for b in tresults %}
+    {
+      "role": "tool",
+      "content": {{ tojson(b.content) }}
+      {% if b.name != "" %}
+      , "tool_name": {{ tojson(b.name) }}
+      {% endif %}
+    },
+    {% endfor %}
+  {% else %}
+  {
+    "role": {{ tojson(msg.role) }},
+    "content": {{ tojson(msg.content) }}
+    {% if length(tcalls) > 0 %}
+    , "tool_calls": [
+      {% for b in tcalls %}
+      { "type": "function", "function": { "name": {{ tojson(b.name) }}, "arguments": {{ tojson(b.input) }} } },
+      {% endfor %}
+    ]
+    {% endif %}
+    {% if existsIn(msg, "images") %}
+    , "images": [
+      {% for img in msg.images %}
+      {{ tojson(img.data) }},
+      {% endfor %}
+    ]
+    {% endif %}
+  },
+  {% endif %}
+{% endfor %}
+]
+"""