rskit-agent 0.2.0-alpha.1

Agentic loop — Provider + Tools + Hooks in a turn-based execution engine
Documentation 
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//! Private run-state owned by the synchronous agent loop.

use std::time::Duration;

use rskit_errors::AppResult;
use rskit_llm::types::{AssistantMessage, CompletionResponse, Message, Usage};
use tokio::time::Instant;

use crate::context::compact_if_needed;
use crate::types::{AgentResult, ContextStrategy, StopReason};

pub(crate) struct RunState {
    pub(crate) messages: Vec<Message>,
    pub(crate) total_usage: Usage,
    pub(crate) last_assistant: AssistantMessage,
    pub(crate) tool_calls_used: u32,
    started_at: Instant,
}

impl RunState {
    pub(crate) fn new(system_prompt: &str, messages: Vec<Message>) -> Self {
        let mut all_messages = vec![rskit_llm::system(system_prompt)];
        all_messages.extend(messages);

        Self {
            messages: all_messages,
            total_usage: Usage {
                input_tokens: 0,
                output_tokens: 0,
                cached_tokens: 0,
                reasoning_tokens: 0,
            },
            last_assistant: AssistantMessage {
                content: vec![],
                tool_calls: vec![],
                usage: None,
            },
            tool_calls_used: 0,
            started_at: Instant::now(),
        }
    }

    pub(crate) fn elapsed(&self) -> Duration {
        self.started_at.elapsed()
    }

    pub(crate) fn remaining_wall_clock(&self, wall_clock: Duration) -> Duration {
        wall_clock.saturating_sub(self.elapsed())
    }

    pub(crate) fn record_response(&mut self, response: CompletionResponse) {
        self.total_usage.input_tokens += response.usage.input_tokens;
        self.total_usage.output_tokens += response.usage.output_tokens;
        self.total_usage.cached_tokens += response.usage.cached_tokens;
        self.total_usage.reasoning_tokens += response.usage.reasoning_tokens;
        self.last_assistant = response.message.clone();
        self.messages.push(Message::Assistant(response.message));
    }

    pub(crate) fn total_tokens(&self) -> usize {
        usize::try_from(
            self.total_usage
                .input_tokens
                .saturating_add(self.total_usage.output_tokens),
        )
        .unwrap_or(usize::MAX)
    }

    pub(crate) fn compact_context(
        &mut self,
        max_input_tokens: Option<u64>,
        strategy: Option<&dyn ContextStrategy>,
    ) -> AppResult<()> {
        let messages = std::mem::take(&mut self.messages);
        self.messages = compact_if_needed(messages, max_input_tokens, strategy)?;
        Ok(())
    }

    pub(crate) fn finish(self, turn_count: u32, stop_reason: StopReason) -> AgentResult {
        AgentResult {
            messages: self.messages,
            final_message: self.last_assistant,
            total_usage: self.total_usage,
            turn_count,
            stop_reason,
        }
    }
}

#[cfg(test)]
mod tests {
    use rskit_llm::types::{AssistantMessage, CompletionResponse, FinishReason, Usage};

    use super::RunState;

    #[test]
    fn record_response_accumulates_all_usage_fields() {
        let mut state = RunState::new("system", Vec::new());

        for usage in [
            Usage {
                input_tokens: 10,
                output_tokens: 5,
                cached_tokens: 3,
                reasoning_tokens: 2,
            },
            Usage {
                input_tokens: 7,
                output_tokens: 4,
                cached_tokens: 1,
                reasoning_tokens: 6,
            },
        ] {
            state.record_response(CompletionResponse {
                message: AssistantMessage {
                    content: Vec::new(),
                    tool_calls: Vec::new(),
                    usage: None,
                },
                model: "mock".to_string(),
                usage,
                stop_reason: Some(FinishReason::Stop),
            });
        }

        assert_eq!(state.total_usage.input_tokens, 17);
        assert_eq!(state.total_usage.output_tokens, 9);
        assert_eq!(state.total_usage.cached_tokens, 4);
        assert_eq!(state.total_usage.reasoning_tokens, 8);
        assert_eq!(state.total_tokens(), 26);
    }
}