codex-convert-proxy 0.1.4

A high-performance proxy server that converts between different AI API formats
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149

//! Tool conversion utilities for Responses API → Chat API.

use crate::types::chat_api::{ChatTool, ChatToolChoice, ChatToolChoiceMode, FunctionChoice, FunctionDefinition, NamedToolChoice};
use crate::types::response_api::{
    Tool as ResponseTool, ToolChoice as ResponseToolChoice,
    ToolType as ResponseToolType,
};

/// Convert Responses API tools to Chat API tools.
pub fn convert_tools(tools: Vec<ResponseTool>) -> Vec<ChatTool> {
    tools
        .into_iter()
        .filter_map(|t| match t.tool_type {
            ResponseToolType::Function | ResponseToolType::Custom | ResponseToolType::Other => {
                Some(passthrough_tool(t))
            }
            ResponseToolType::WebSearchPreview => Some(builtin_tool(
                t,
                "web_search_preview",
                "Web search tool",
                serde_json::json!({
                    "type": "object",
                    "properties": {
                        "query": {
                            "type": "string",
                            "description": "The search query"
                        }
                    },
                    "required": ["query"]
                }),
            )),
            ResponseToolType::CodeInterpreter => Some(builtin_tool(
                t,
                "code_interpreter",
                "Code interpreter tool",
                serde_json::json!({
                    "type": "object",
                    "properties": {
                        "code": {
                            "type": "string",
                            "description": "The code to execute"
                        }
                    },
                    "required": ["code"]
                }),
            )),
            ResponseToolType::FileSearch => Some(builtin_tool(
                t,
                "file_search",
                "File search tool",
                serde_json::json!({
                    "type": "object",
                    "properties": {
                        "query": {
                            "type": "string",
                            "description": "The search query"
                        }
                    },
                    "required": ["query"]
                }),
            )),
            ResponseToolType::Namespace => None,
        })
        .collect()
}

/// Pass through a tool as-is as a function tool.
fn passthrough_tool(t: ResponseTool) -> ChatTool {
    ChatTool {
        tool_type: "function".to_string(),
        function: FunctionDefinition {
            name: t.name.unwrap_or_default(),
            description: t.description,
            parameters: t.parameters,
            strict: t.strict,
        },
    }
}

/// Convert a built-in tool to a function tool with default parameters.
fn builtin_tool(
    t: ResponseTool,
    default_name: &str,
    default_desc: &str,
    param_schema: serde_json::Value,
) -> ChatTool {
    ChatTool {
        tool_type: "function".to_string(),
        function: FunctionDefinition {
            name: t.name.unwrap_or_else(|| default_name.to_string()),
            description: t.description.or_else(|| Some(default_desc.to_string())),
            parameters: Some(param_schema),
            strict: t.strict,
        },
    }
}

/// Convert Responses API tool choice to Chat API tool choice.
pub fn convert_tool_choice(choice: ResponseToolChoice) -> ChatToolChoice {
    match choice {
        ResponseToolChoice::Auto => ChatToolChoice::Mode(ChatToolChoiceMode::Auto),
        ResponseToolChoice::None => ChatToolChoice::Mode(ChatToolChoiceMode::None),
        ResponseToolChoice::Required => ChatToolChoice::Mode(ChatToolChoiceMode::Required),
        ResponseToolChoice::Function(f) => ChatToolChoice::Named(NamedToolChoice {
            tool_type: "function".to_string(),
            function: FunctionChoice { name: f.name },
        }),
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::types::response_api::FunctionToolChoice;

    #[test]
    fn test_named_tool_choice_serializes_to_openai_shape() {
        // OpenAI `ChatCompletionNamedToolChoice` requires
        // `{type:"function", function:{name:"…"}}`.
        let choice = convert_tool_choice(ResponseToolChoice::Function(FunctionToolChoice {
            name: "get_weather".to_string(),
        }));
        let json = serde_json::to_value(&choice).unwrap();
        assert_eq!(json["type"], "function");
        assert_eq!(json["function"]["name"], "get_weather");
    }

    #[test]
    fn test_tool_choice_mode_serializes_as_string() {
        let json = serde_json::to_value(convert_tool_choice(ResponseToolChoice::None)).unwrap();
        assert_eq!(json, serde_json::json!("none"));
        let json = serde_json::to_value(convert_tool_choice(ResponseToolChoice::Required)).unwrap();
        assert_eq!(json, serde_json::json!("required"));
    }

    #[test]
    fn test_function_definition_carries_strict() {
        let tool = ResponseTool {
            tool_type: ResponseToolType::Function,
            name: Some("f".to_string()),
            description: None,
            parameters: None,
            strict: Some(true),
            extra: Default::default(),
        };
        let chat_tools = convert_tools(vec![tool]);
        assert_eq!(chat_tools[0].function.strict, Some(true));
    }
}