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feat(compaction): serialize compaction tail (#26830)

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This commit is contained in:
Shoubhit Dash
2026-05-11 13:40:36 +05:30
committed by GitHub
parent 3bd98ea055
commit 2d0d3d596e
5 changed files with 77 additions and 95 deletions
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50
packages/opencode/test/session/compaction.test.ts
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@@ -926,12 +926,12 @@ describe("session.compaction.process", () => {
)
itCompaction.instance(
"persists tail_start_id for retained recent turns",
"does not persist tail_start_id for serialized recent turns",
Effect.gen(function* () {
const ssn = yield* SessionNs.Service
const session = yield* ssn.create({})
yield* createUserMessage(session.id, "first")
const keep = yield* createUserMessage(session.id, "second")
yield* createUserMessage(session.id, "second")
yield* createUserMessage(session.id, "third")
yield* createSummaryCompaction(session.id)
@@ -947,18 +947,18 @@ describe("session.compaction.process", () => {
const part = yield* readCompactionPart(session.id)
expect(part?.type).toBe("compaction")
expect(part?.tail_start_id).toBe(keep.id)
expect(part?.tail_start_id).toBeUndefined()
}).pipe(withCompaction({ config: cfg({ tail_turns: 2, preserve_recent_tokens: 10_000 }) })),
)
itCompaction.instance(
"shrinks retained tail to fit preserve token budget",
"does not persist tail_start_id when shrinking serialized tail",
Effect.gen(function* () {
const ssn = yield* SessionNs.Service
const session = yield* ssn.create({})
yield* createUserMessage(session.id, "first")
yield* createUserMessage(session.id, "x".repeat(2_000))
const keep = yield* createUserMessage(session.id, "tiny")
yield* createUserMessage(session.id, "tiny")
yield* createSummaryCompaction(session.id)
const msgs = yield* ssn.messages({ sessionID: session.id })
@@ -973,7 +973,7 @@ describe("session.compaction.process", () => {
const part = yield* readCompactionPart(session.id)
expect(part?.type).toBe("compaction")
expect(part?.tail_start_id).toBe(keep.id)
expect(part?.tail_start_id).toBeUndefined()
}).pipe(withCompaction({ config: cfg({ tail_turns: 2, preserve_recent_tokens: 100 }) })),
)
@@ -1005,7 +1005,7 @@ describe("session.compaction.process", () => {
)
itCompaction.instance(
"falls back to full summary when retained tail media exceeds preserve token budget",
"serializes retained tail media as text in the summary input",
() => {
const stub = llm()
let captured = ""
@@ -1078,15 +1078,16 @@ describe("session.compaction.process", () => {
const part = yield* readCompactionPart(session.id)
expect(part?.type).toBe("compaction")
expect(part?.tail_start_id).toBe(keep.id)
expect(part?.tail_start_id).toBeUndefined()
expect(captured).toContain("zzzz")
expect(captured).not.toContain("keep tail")
expect(captured).toContain("keep tail")
const filtered = MessageV2.filterCompacted(MessageV2.stream(session.id))
expect(filtered.map((msg) => msg.info.id).slice(0, 3)).toEqual([parent!, expect.any(String), keep.id])
expect(filtered.map((msg) => msg.info.id)).toEqual([parent!, expect.any(String)])
expect(filtered[1]?.info.role).toBe("assistant")
expect(filtered[1]?.info.role === "assistant" ? filtered[1].info.summary : false).toBe(true)
expect(filtered.map((msg) => msg.info.id)).not.toContain(large.id)
expect(filtered.map((msg) => msg.info.id)).not.toContain(keep.id)
}).pipe(withCompaction({ llm: stub.layer, config: cfg({ tail_turns: 1, preserve_recent_tokens: 100 }) }))
},
{ git: true },
@@ -1353,13 +1354,13 @@ describe("session.compaction.process", () => {
)
itCompaction.instance(
"summarizes only the head while keeping recent tail out of summary input",
"summarizes the head while serializing recent tail into summary input",
() => {
const stub = llm()
let captured = ""
let captured: LLM.StreamInput["messages"] = []
stub.push(
reply("summary", (input) => {
captured = JSON.stringify(input.messages)
captured = input.messages
}),
)
return Effect.gen(function* () {
@@ -1380,10 +1381,15 @@ describe("session.compaction.process", () => {
auto: false,
})
expect(captured).toContain("older context")
expect(captured).not.toContain("keep this turn")
expect(captured).not.toContain("and this one too")
expect(captured).not.toContain("What did we do so far?")
const head = JSON.stringify(captured.slice(0, -1))
const prompt = JSON.stringify(captured.at(-1))
expect(head).toContain("older context")
expect(head).not.toContain("keep this turn")
expect(head).not.toContain("and this one too")
expect(prompt).toContain("keep this turn")
expect(prompt).toContain("and this one too")
expect(prompt).toContain("recent-conversation-tail")
expect(prompt).not.toContain("What did we do so far?")
}).pipe(withCompaction({ llm: stub.layer }))
},
{ git: true },
@@ -1431,7 +1437,7 @@ describe("session.compaction.process", () => {
{ git: true },
)
itCompaction.instance("keeps recent pre-compaction turns across repeated compactions", () => {
itCompaction.instance("does not replay recent pre-compaction turns across repeated compactions", () => {
const stub = llm()
stub.push(reply("summary one"))
stub.push(reply("summary two"))
@@ -1462,8 +1468,8 @@ describe("session.compaction.process", () => {
expect(ids).not.toContain(u1.id)
expect(ids).not.toContain(u2.id)
expect(ids).toContain(u3.id)
expect(ids).toContain(u4.id)
expect(ids).not.toContain(u3.id)
expect(ids).not.toContain(u4.id)
expect(filtered.some((msg) => msg.info.role === "assistant" && msg.info.summary)).toBe(true)
expect(
filtered.some((msg) => msg.info.role === "user" && msg.parts.some((part) => part.type === "compaction")),
@@ -1472,7 +1478,7 @@ describe("session.compaction.process", () => {
})
itCompaction.instance(
"ignores previous summaries when sizing the retained tail",
"ignores previous summaries when sizing the serialized tail",
Effect.gen(function* () {
const ssn = yield* SessionNs.Service
const test = yield* TestInstance
@@ -1511,7 +1517,7 @@ describe("session.compaction.process", () => {
const part = yield* readCompactionPart(session.id)
expect(part?.type).toBe("compaction")
expect(part?.tail_start_id).toBe(keep.id)
expect(part?.tail_start_id).toBeUndefined()
}).pipe(withCompaction({ config: cfg({ tail_turns: 2, preserve_recent_tokens: 500 }) })),
)
})