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fix: re-trace system prompt on agent switch #548

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fix: re-trace system prompt on agent switch #548

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11 changes: 6 additions & 5 deletions packages/opencode/src/session/prompt.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -320,6 +320,7 @@ export namespace SessionPrompt {
let compactionCount = 0
let sessionAgentName = ""
let sessionHadError = false
let tracedAgent = ""
let emergencySessionEndFired = false
const emergencySessionEnd = () => {
if (emergencySessionEndFired) return
Expand Down Expand Up @@ -728,18 +729,18 @@ export namespace SessionPrompt {
system.push(STRUCTURED_OUTPUT_SYSTEM_PROMPT)
}

// altimate_change start - trace system prompt once per loop() call.
// The system prompt is functionally identical across steps within a single
// loop() invocation (same agent, same environment). Agent switches re-enter
// loop() with step reset to 0, so each agent's prompt is traced separately.
if (step === 1) {
// altimate_change start - trace system prompt once per agent.
// The step counter is never reset on agent switches, so we track the
// last-traced agent to ensure each agent's system prompt is logged.
if (step === 1 || agent.name !== tracedAgent) {
Tracer.active?.logSpan({
name: "system-prompt",
startTime: Date.now(),
endTime: Date.now(),
input: { agent: agent.name, step },
output: { parts: system.length, content: system.join("\n\n") },
})
tracedAgent = agent.name
}
// altimate_change end

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