harn-vm 0.10.169

Async bytecode virtual machine for the Harn programming language
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

use crate::llm::api::{DeltaSender, LlmResult};
use crate::llm::providers::schema_compat::{
    sanitize_schema_for_provider, SchemaCompatProfile, SchemaSurface,
};
use crate::value::{VmError, VmValue};

pub(super) fn vm_err(message: impl Into<String>) -> VmError {
    VmError::Thrown(VmValue::string(message.into()))
}

pub(super) fn maybe_emit_delta(delta_tx: Option<DeltaSender>, text: &str) {
    if let Some(tx) = delta_tx {
        if !text.is_empty() {
            let _ = tx.send(text.to_string());
        }
    }
}

/// Canonical assistant-visible text block. `visibility` must stay `"public"`
/// so downstream redaction keeps the text in the user-facing transcript.
pub(super) fn output_text_block(text: &str) -> serde_json::Value {
    serde_json::json!({
        "type": "output_text",
        "text": text,
        "visibility": "public",
    })
}

/// Canonical reasoning/thinking block. `visibility` must stay `"private"` so
/// the chain-of-thought is never surfaced as user-facing output.
pub(super) fn reasoning_block(text: &str) -> serde_json::Value {
    serde_json::json!({
        "type": "reasoning",
        "text": text,
        "visibility": "private",
    })
}

/// Canonical tool-call block. `visibility` must stay `"internal"` so the call
/// is routed to tool execution rather than rendered as assistant output.
/// Provider-specific metadata (e.g. `thought_signature`, `part_index`) is
/// layered onto the returned value by the caller.
pub(super) fn tool_call_block(
    id: impl Into<serde_json::Value>,
    name: impl Into<serde_json::Value>,
    arguments: impl Into<serde_json::Value>,
) -> serde_json::Value {
    serde_json::json!({
        "type": "tool_call",
        "id": id.into(),
        "name": name.into(),
        "arguments": arguments.into(),
        "visibility": "internal",
    })
}

pub(super) use harn_llm::wire::request_text_content;

pub(super) fn empty_result(provider: &str, model: &str) -> LlmResult {
    LlmResult {
        attempts: Default::default(),
        text_projection: None,
        served_fast: false,
        text: String::new(),
        tool_calls: Vec::new(),
        raw_tool_calls: Vec::new(),
        input_tokens: 0,
        output_tokens: 0,
        cache_read_tokens: 0,
        cache_write_tokens: 0,
        cache_supported: true,
        model: model.to_string(),
        provider: provider.to_string(),
        thinking: None,
        thinking_summary: None,
        stop_reason: None,
        blocks: Vec::new(),
        logprobs: Vec::new(),
        telemetry: Box::default(),
    }
}

pub(super) fn apply_provider_overrides(
    body: &mut serde_json::Value,
    overrides: Option<&serde_json::Value>,
) {
    crate::llm::provider::apply_provider_wire_overrides(body, overrides);
}

pub(super) fn google_function_declaration_tools(
    provider: &str,
    model: &str,
    tools: Option<&[serde_json::Value]>,
) -> Option<serde_json::Value> {
    let declarations: Vec<serde_json::Value> = tools
        .unwrap_or_default()
        .iter()
        .filter_map(|tool| google_function_declaration(provider, model, tool))
        .collect();
    (!declarations.is_empty())
        .then(|| serde_json::json!([{ "functionDeclarations": declarations }]))
}

fn google_function_declaration(
    provider: &str,
    model: &str,
    tool: &serde_json::Value,
) -> Option<serde_json::Value> {
    let function = tool.get("function").unwrap_or(tool);
    let name = function
        .get("name")
        .and_then(serde_json::Value::as_str)
        .filter(|name| !name.is_empty())?;
    let mut declaration = serde_json::json!({ "name": name });
    if let Some(description) = function.get("description") {
        declaration["description"] = description.clone();
    }
    if let Some(parameters) = function
        .get("parameters")
        .or_else(|| function.get("input_schema"))
    {
        declaration["parameters"] = sanitize_schema_for_provider(
            provider,
            model,
            SchemaCompatProfile::Google,
            SchemaSurface::ToolParameters,
            parameters,
        );
    }
    Some(declaration)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn provider_overrides_do_not_emit_harn_control_fields() {
        let mut body = serde_json::json!({"model": "example"});
        let overrides = serde_json::json!({
            "force_native_tool_search": true,
            "custom_wire_field": "kept",
        });

        apply_provider_overrides(&mut body, Some(&overrides));

        assert!(body.get("force_native_tool_search").is_none());
        assert_eq!(body["custom_wire_field"], "kept");
    }
}