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feat(core): persist v2 session context epochs (#30789)

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Kit Langton 2026-06-04 23:26:43 -04:00 • committed by GitHub
commit 1af8dafd3e
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45 changed files with 4861 additions and 521 deletions
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56
packages/llm/src/protocols/anthropic-messages.ts
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@ -351,38 +351,29 @@ const endsInServerToolUse = (message: LLMRequest["messages"][number]) => {
return message.role === "assistant" && last?.type === "tool-call" && last.providerExecuted === true
}
const endsInLocalToolUse = (message: LLMRequest["messages"][number]) => {
const last = message.content.at(-1)
return message.role === "assistant" && last?.type === "tool-call" && last.providerExecuted !== true
}
const validateNativeSystemUpdate = Effect.fn("AnthropicMessages.validateNativeSystemUpdate")(function* (
messages: LLMRequest["messages"],
index: number,
) {
const canUseNativeSystemUpdate = (messages: LLMRequest["messages"], index: number) => {
const previous = messages[index - 1]
const next = messages[index + 1]
if (!previous)
return yield* invalid(
"Anthropic Messages chronological system updates cannot be the first message; use LLMRequest.system",
)
if (previous.role === "system")
return yield* invalid("Anthropic Messages chronological system updates cannot be consecutive")
if (endsInLocalToolUse(previous))
return yield* invalid(
"Anthropic Messages chronological system updates cannot appear between a local tool call and its tool result",
)
if (previous.role !== "user" && previous.role !== "tool" && !endsInServerToolUse(previous))
return yield* invalid(
"Anthropic Messages chronological system updates must follow a user message, tool result, or assistant server tool use",
)
if (next?.role === "system")
return yield* invalid("Anthropic Messages chronological system updates cannot be consecutive")
if (next && next.role !== "assistant")
return yield* invalid(
"Anthropic Messages chronological system updates must end the messages array or immediately precede an assistant message",
)
})
return (
previous !== undefined &&
previous.role !== "system" &&
(previous.role === "user" || previous.role === "tool" || endsInServerToolUse(previous)) &&
next?.role !== "system" &&
(next === undefined || next.role === "assistant")
)
}
const splitsLocalToolResults = (messages: LLMRequest["messages"], index: number) => {
const pending = new Set<string>()
for (const message of messages.slice(0, index)) {
for (const part of message.content) {
if (message.role === "assistant" && part.type === "tool-call" && part.providerExecuted !== true)
pending.add(part.id)
if (message.role === "tool" && part.type === "tool-result") pending.delete(part.id)
}
}
return pending.size > 0
}
const lowerNativeSystemUpdate = Effect.fn("AnthropicMessages.lowerNativeSystemUpdate")(function* (
message: LLMRequest["messages"][number],
@ -407,8 +398,9 @@ const lowerMessages = Effect.fn("AnthropicMessages.lowerMessages")(function* (
for (const [index, message] of request.messages.entries()) {
if (message.role === "system") {
if (supportsNativeSystemUpdates(request)) {
yield* validateNativeSystemUpdate(request.messages, index)
if (splitsLocalToolResults(request.messages, index))
return yield* invalid("Anthropic Messages system updates cannot split a local tool call from its tool result")
if (supportsNativeSystemUpdates(request) && canUseNativeSystemUpdate(request.messages, index)) {
messages.push(yield* lowerNativeSystemUpdate(message, breakpoints))
continue
}