add support for model parameters passing

README.md

@@ -457,6 +457,26 @@ taskflow:
 
 The model version can then be updated by changing `gpt_latest` in the `model_config` file and applied across all taskflows that use the config.
 
+In addition, model specific parameters can be provided via `model_config`. To do so, define a `model_settings` section in the `model_config` file. This section has to be a dictionary with the model names as keys:
+
+```yaml
+model_settings:
+  gpt_latest:
+    temperature: 1
+    reasoning:
+      effort: high
+```
+
+You do not need to set parameters for all models defined in the `models` section. When parameters is not set for a model, they'll fall back to the default value. However, all the settings in this section must belong to one of the models specified in the `models` section, otherwise an error will raise:
+
+```yaml
+model_settings:
+  new_model:
+    ...
+```
+
+The above will result in an error because `new_model` is not defined in `models` section. Model parameters can also be set per task, and any settings defined in a task will override the settings in the config.
+
 ## Passing environment variables
 
 Files of types `taskflow` and `toolbox` allow environment variables to be passed using the `env` field:

doc/GRAMMAR.md

@@ -91,6 +91,18 @@ Tasks can optionally specify which Model to use on the configured inference endp
 
 Note that model identifiers may differ between OpenAI compatible endpoint providers, make sure you change your model identifier accordingly when switching providers. If not specified, a default LLM model (`gpt-4o`) is used.
 
+Parameters to the model can also be specified in the task using the `model_settings` section:
+
+```yaml
+    model: gpt-5-mini
+    model_settings:
+      temperature: 1
+      reasoning:
+        effort: high
+```
+
+If `model_settings` is absent, then the model parameters will fall back to either the default or the ones supplied in a `model_config`. However, any parameters supplied in the task will override those that are set in the `model_config`.
+
 ### Completion Requirement
 
 Tasks can be marked as requiring completion, if a required task fails, the taskflow will abort. This defaults to false.

src/seclab_taskflow_agent/__main__.py

@@ -107,7 +107,7 @@
                              exclude_from_context: bool = False,
                              max_turns: int = DEFAULT_MAX_TURNS,
                              model: str = DEFAULT_MODEL,
-                             model_settings: ModelSettings | None = None,
+                             model_par: dict = {},
                              run_hooks: TaskRunHooks | None = None,
                              agent_hooks: TaskAgentHooks | None = None):
 
@@ -130,10 +130,11 @@
 
     # https://openai.github.io/openai-agents-python/ref/model_settings/
     parallel_tool_calls = True if os.getenv('MODEL_PARALLEL_TOOL_CALLS') else False
-    model_settings = ModelSettings(
-        temperature=os.getenv('MODEL_TEMP', default=0.0),
-        tool_choice=('auto' if toolboxes else None),
-        parallel_tool_calls=(parallel_tool_calls if toolboxes else None))
+    model_params = {'temperature' : os.getenv('MODEL_TEMP', default = 0.0),
+                        'tool_choice' : ('auto' if toolboxes else None),
+                        'parallel_tool_calls' : (parallel_tool_calls if toolboxes else None)}
+    model_params.update(model_par)
+    model_settings = ModelSettings(**model_params)
 
     # block tools if requested
     tool_filter = create_static_tool_filter(blocked_tool_names=blocked_tools) if blocked_tools else None
@@ -438,13 +439,22 @@
             global_variables.update(cli_globals)
         model_config = taskflow.get('model_config', {})
         model_keys = []
+        models_params = {}
         if model_config:
-            model_dict = available_tools.get_model_config(model_config)
-            model_dict = model_dict.get('models', {})
+            m_config = available_tools.get_model_config(model_config)
+            model_dict = m_config.get('models', {})
             if model_dict:
                 if not isinstance(model_dict, dict):
                     raise ValueError(f"Models section of the model_config file {model_config} must be a dictionary")
-            model_keys = model_dict.keys() 
+            model_keys = model_dict.keys()
+            models_params = m_config.get('model_settings', {})
+            if models_params and not isinstance(models_params, dict):
+                raise ValueError(f"Settings section of model_config file {model_config} must be a dictionary")
+            if not set(models_params.keys()).difference(model_keys).issubset(set([])):
+                raise ValueError(f"Settings section of model_config file {model_config} contains models that are not in the model section")
+            for k,v in models_params.items():
+                if not isinstance(v, dict):
+                    raise ValueError(f"Settings for model {k} in model_config file {model_config} is not a dictionary")
 
         for task in taskflow['taskflow']:
 
@@ -465,10 +475,19 @@
                     if k not in task_body:
                         task_body[k] = v
             model = task_body.get('model', DEFAULT_MODEL)
+            model_settings = {}
             if model in model_keys:
+                if model in models_params:
+                    model_settings = models_params[model]
                 model = model_dict[model]
+            task_model_settings = task_body.get('model_settings', {})
+            if not isinstance(task_model_settings, dict):
+                name = task.get('name', '')
+                raise ValueError(f"model_settings in task {name} needs to be a dictionary")
+            model_settings.update(task_model_settings)
+
             # parse our taskflow grammar
             name = task_body.get('name', 'taskflow') # placeholder, not used yet
             description = task_body.get('description', 'taskflow') # placeholder not used yet
             agents = task_body.get('agents', [])
             headless = task_body.get('headless', False)
@@ -622,6 +641,7 @@
                                         on_tool_end=on_tool_end_hook,
                                         on_tool_start=on_tool_start_hook),
                                     model = model,
+                                    model_par = model_settings,
                                     agent_hooks=TaskAgentHooks(
                                         on_handoff=on_handoff_hook))
                             return result