Add RunRequest field AdditionalInstructions (#656)

AdditionalInstructions is an optional string field used to append
additional instructions at the end of the instructions for the run. This
is useful for modifying the behavior on a per-run basis without
overriding other instructions.

Also, change the Model and Instructions *string fields to string.

run.go

@@ -72,11 +72,12 @@ const (
 )
 
 type RunRequest struct {
- AssistantID string `json:"assistant_id"`
- Model *string `json:"model,omitempty"`
- Instructions *string `json:"instructions,omitempty"`
- Tools []Tool `json:"tools,omitempty"`
- Metadata map[string]any `json:"metadata,omitempty"`
+ AssistantID string `json:"assistant_id"`
+ Model string `json:"model,omitempty"`
+ Instructions string `json:"instructions,omitempty"`
+ AdditionalInstructions string `json:"additional_instructions,omitempty"`
+ Tools []Tool `json:"tools,omitempty"`
+ Metadata map[string]any `json:"metadata,omitempty"`
 }
 
 type RunModifyRequest struct {