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fix(session): improve session compaction (#23870)

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This commit is contained in:
Shoubhit Dash 2026-04-22 20:37:32 +05:30 • committed by Aiden Cline
commit 574b2c2170
6 changed files with 561 additions and 83 deletions
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14
packages/opencode/src/session/message-v2.ts
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@ -319,6 +319,12 @@ export const ToolStateCompleted = Schema.Struct({
.pipe(withStatics((s) => ({ zod: zod(s) })))
export type ToolStateCompleted = Types.DeepMutable<Schema.Schema.Type<typeof ToolStateCompleted>>
function truncateToolOutput(text: string, maxChars?: number) {
if (!maxChars || text.length <= maxChars) return text
const omitted = text.length - maxChars
return `${text.slice(0, maxChars)}\n[Tool output truncated for compaction: omitted ${omitted} chars]`
}
export const ToolStateError = Schema.Struct({
status: Schema.Literal("error"),
input: Schema.Record(Schema.String, Schema.Any),
@ -700,7 +706,7 @@ function providerMeta(metadata: Record<string, any> | undefined) {
export const toModelMessagesEffect = Effect.fnUntraced(function* (
input: WithParts[],
model: Provider.Model,
options?: { stripMedia?: boolean },
options?: { stripMedia?: boolean; toolOutputMaxChars?: number },
) {
const result: UIMessage[] = []
const toolNames = new Set<string>()
@ -839,7 +845,9 @@ export const toModelMessagesEffect = Effect.fnUntraced(function* (
if (part.type === "tool") {
toolNames.add(part.tool)
if (part.state.status === "completed") {
const outputText = part.state.time.compacted ? "[Old tool result content cleared]" : part.state.output
const outputText = part.state.time.compacted
? "[Old tool result content cleared]"
: truncateToolOutput(part.state.output, options?.toolOutputMaxChars)
const attachments = part.state.time.compacted || options?.stripMedia ? [] : (part.state.attachments ?? [])
// For providers that don't support media in tool results, extract media files
@ -955,7 +963,7 @@ export const toModelMessagesEffect = Effect.fnUntraced(function* (
export function toModelMessages(
input: WithParts[],
model: Provider.Model,
options?: { stripMedia?: boolean },
options?: { stripMedia?: boolean; toolOutputMaxChars?: number },
): Promise<ModelMessage[]> {
return Effect.runPromise(toModelMessagesEffect(input, model, options).pipe(Effect.provide(EffectLogger.layer)))
}