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Add explicit LLM stream lifecycle events (#26722)

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Kit Langton 2026-05-10 12:19:13 -04:00 • committed by GitHub
commit ce061bf661
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16 changed files with 200 additions and 125 deletions
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20
packages/llm/src/tool-runtime.ts
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@ -4,7 +4,7 @@ import {
type ContentPart,
type FinishReason,
type LLMError,
type LLMEvent,
LLMEvent,
LLMRequest,
Message,
type ProviderMetadata,
@ -115,11 +115,19 @@ interface StepState {
const accumulate = (state: StepState, event: LLMEvent) => {
if (event.type === "text-delta") {
appendStreamingText(state, "text", event.text, event.providerMetadata)
appendStreamingText(state, "text", event.text, undefined)
return
}
if (event.type === "reasoning-delta") {
appendStreamingText(state, "reasoning", event.text, event.providerMetadata)
appendStreamingText(state, "reasoning", event.text, undefined)
return
}
if (event.type === "reasoning-end") {
appendStreamingText(state, "reasoning", "", event.providerMetadata)
return
}
if (event.type === "text-end") {
appendStreamingText(state, "text", "", event.providerMetadata)
return
}
if (event.type === "tool-call") {
@ -219,10 +227,10 @@ const decodeAndExecute = (tool: AnyTool, input: unknown): Effect.Effect<ToolResu
const emitEvents = (call: ToolCallPart, result: ToolResultValue): ReadonlyArray<LLMEvent> =>
result.type === "error"
? [
{ type: "tool-error", id: call.id, name: call.name, message: String(result.value) },
{ type: "tool-result", id: call.id, name: call.name, result },
LLMEvent.toolError({ id: call.id, name: call.name, message: String(result.value) }),
LLMEvent.toolResult({ id: call.id, name: call.name, result }),
]
: [{ type: "tool-result", id: call.id, name: call.name, result }]
: [LLMEvent.toolResult({ id: call.id, name: call.name, result })]
const followUpRequest = (
request: LLMRequest,