Method build_request

core/src/llm/anthropic.rs:91–153

(
        &self,
        messages: &[Message],
        system: Option<&str>,
        tools: &[ToolDefinition],
    )

    }

    pub(crate) fn build_request(
        &self,
        messages: &[Message],
        system: Option<&str>,
        tools: &[ToolDefinition],
    ) -> serde_json::Value {
        let mut request = serde_json::json!({
            "model": self.model,
            "max_tokens": self.max_tokens,
            "messages": messages,
        });

        // System prompt with cache_control for prompt caching.
        // Anthropic caches system content blocks marked with
        // `cache_control: { type: "ephemeral" }`.
        if let Some(sys) = system {
            request["system"] = serde_json::json!([
                {
                    "type": "text",
                    "text": sys,
                    "cache_control": { "type": "ephemeral" }
                }
            ]);
        }

        if !tools.is_empty() {
            let mut tool_defs: Vec<serde_json::Value> = tools
                .iter()
                .map(|t| {
                    serde_json::json!({
                        "name": t.name,
                        "description": t.description,
                        "input_schema": t.parameters,
                    })
                })
                .collect();

            // Mark the last tool definition with cache_control so the
            // entire tool block is cached on subsequent requests.
            if let Some(last) = tool_defs.last_mut() {
                last["cache_control"] = serde_json::json!({ "type": "ephemeral" });
            }

            request["tools"] = serde_json::json!(tool_defs);
        }

        // Apply optional sampling parameters
        if let Some(temp) = self.temperature {
            request["temperature"] = serde_json::json!(temp);
        }

        // Extended thinking (Anthropic-specific)
        if let Some(budget) = self.thinking_budget {
            request["thinking"] = serde_json::json!({
                "type": "enabled",
                "budget_tokens": budget
            });
            // Thinking requires temperature=1 per Anthropic docs