kova-sdk 0.2.0

Async-first Rust library for building LLM-powered agents with tool calling, streaming, MCP, and multi-agent orchestration
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
150
151
152
153
154
155

use serde::{Deserialize, Serialize};

// ── Parts ──────────────────────────────────────────────────────────

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub(crate) struct GeminiPart {
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) text: Option<String>,
    // Thinking models set this to true on chain-of-thought parts.
    // These parts must not be shown to users or treated as tool calls.
    #[serde(skip_serializing_if = "Option::is_none", default)]
    pub(crate) thought: Option<bool>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) function_call: Option<GeminiFunctionCall>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) function_response: Option<GeminiFunctionResponse>,
    // Required by Gemini thinking models: must be round-tripped as-is
    // when replaying function calls in subsequent turns.
    #[serde(skip_serializing_if = "Option::is_none", default)]
    pub(crate) thought_signature: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub(crate) struct GeminiFunctionCall {
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) id: Option<String>,
    pub(crate) name: String,
    pub(crate) args: serde_json::Value,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub(crate) struct GeminiFunctionResponse {
    pub(crate) name: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) id: Option<String>,
    pub(crate) response: serde_json::Value,
}

// ── Content ────────────────────────────────────────────────────────

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub(crate) struct GeminiContent {
    pub(crate) role: String,
    pub(crate) parts: Vec<GeminiPart>,
}

// ── Tools ──────────────────────────────────────────────────────────

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub(crate) struct GeminiTool {
    pub(crate) function_declarations: Vec<GeminiFunctionDeclaration>,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub(crate) struct GeminiFunctionDeclaration {
    pub(crate) name: String,
    pub(crate) description: String,
    pub(crate) parameters: serde_json::Value,
}

// ── GenerationConfig ───────────────────────────────────────────────

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub(crate) struct GeminiGenerationConfig {
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) max_output_tokens: Option<u32>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) temperature: Option<f32>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) thinking_config: Option<GeminiThinkingConfig>,
}

/// Controls chain-of-thought budget for thinking-capable Gemini models.
/// Set `thinking_budget` to -1 for dynamic (unlimited), 0 to disable,
/// or a positive value to cap tokens spent on reasoning.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub(crate) struct GeminiThinkingConfig {
    pub(crate) thinking_budget: i32,
    // Must be true for thought parts to appear in the response; false = model
    // thinks silently. Omitted (None) when thinking is disabled (budget == 0).
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) include_thoughts: Option<bool>,
}

// ── Request ────────────────────────────────────────────────────────

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub(crate) struct GeminiRequest {
    pub(crate) contents: Vec<GeminiContent>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) system_instruction: Option<GeminiContent>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) tools: Option<Vec<GeminiTool>>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) generation_config: Option<GeminiGenerationConfig>,
}

// ── Response ───────────────────────────────────────────────────────

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub(crate) struct GeminiResponse {
    #[serde(default)]
    pub(crate) candidates: Vec<GeminiCandidate>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) usage_metadata: Option<GeminiUsageMetadata>,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub(crate) struct GeminiCandidate {
    // Optional: Gemini's final usage/stop chunks often omit the content field entirely.
    #[serde(default)]
    pub(crate) content: Option<GeminiContent>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) finish_reason: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub(crate) struct GeminiUsageMetadata {
    #[serde(default)]
    pub(crate) prompt_token_count: u32,
    #[serde(default)]
    pub(crate) candidates_token_count: u32,
    #[serde(default)]
    pub(crate) total_token_count: u32,
}

// ── Model list ─────────────────────────────────────────────────────

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub(crate) struct GeminiModelListResponse {
    #[serde(default)]
    pub(crate) models: Vec<GeminiModelInfo>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) next_page_token: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub(crate) struct GeminiModelInfo {
    /// Resource name, e.g. `"models/gemini-2.0-flash"`.
    pub(crate) name: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) display_name: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) version: Option<String>,
}