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fix(libsy): preserve classifier system instruction #195

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Merged
bbednarski9 merged 1 commit into from
Jul 30, 2026
Merged

fix(libsy): preserve classifier system instruction #195

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20 changes: 13 additions & 7 deletions crates/libsy/src/algorithms/llm_class.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ use std::sync::Arc;
use async_trait::async_trait;
use serde::Deserialize;
use serde_json::Value;
use switchyard_protocol::{LlmRequest, Message, OutputParams, Role};
use switchyard_protocol::{InstructionBlock, LlmRequest, Message, OutputParams, Role};

use super::util::{AffinityRouter, Judge, JudgeClassifier, JudgeConfig, JudgePolicy};
use super::{DefaultTarget, FallThrough};
Expand Down Expand Up @@ -95,7 +95,7 @@ impl Judge for CapabilityJudge {
fn build_request(&self, _state: &State, request: &Request) -> Request {
// Task-based routing judges the newest user message alone. A configured
// window widens that to the surrounding conversation.
let mut messages = match self.recent_turn_window {
let messages = match self.recent_turn_window {
Some(window) => trim_messages(&request.llm_request.messages, window),
None => request
.llm_request
Expand All @@ -107,13 +107,13 @@ impl Judge for CapabilityJudge {
.into_iter()
.collect::<Vec<_>>(),
};
messages.insert(
0,
Message::text(Role::System, self.config.system_prompt.clone()),
);
Request {
llm_request: LlmRequest {
model: request.llm_request.model.clone(),
instructions: vec![InstructionBlock {
role: Role::System,
content: Message::text(Role::System, self.config.system_prompt.clone()).content,
}],
messages,
output: OutputParams {
response_format: self.config.response_schema.clone(),
Expand Down Expand Up @@ -863,7 +863,13 @@ mod tests {
let judge_request = judge.build_request(&State::default(), &request);

assert_eq!(judge_request.llm_request.model, request.llm_request.model);
assert_eq!(judge_request.llm_request.messages.len(), 2);
assert_eq!(judge_request.llm_request.instructions.len(), 1);
assert_eq!(judge_request.llm_request.instructions[0].role, Role::System);
assert_eq!(
judge_request.llm_request.instructions[0].content,
Message::text(Role::System, judge.config.system_prompt.clone()).content
);
assert_eq!(judge_request.llm_request.messages.len(), 1);
let contents = judge_request
.llm_request
.messages
Expand Down
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