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fix(coding-agent): avoid empty compaction summaries

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closes #4811
This commit is contained in:
Armin Ronacher
2026-06-18 22:17:57 +02:00
parent 6b9f3f492f
commit 7d08c81a09
7 changed files with 37 additions and 75 deletions
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25
packages/coding-agent/test/compaction.test.ts
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@@ -9,7 +9,6 @@ import {
calculateContextTokens,
compact,
DEFAULT_COMPACTION_SETTINGS,
estimateContextTokens,
findCutPoint,
getLastAssistantUsage,
prepareCompaction,
@@ -396,7 +395,7 @@ describe("buildSessionContext", () => {
});
describe("prepareCompaction with previous compaction", () => {
it("should preserve kept messages across repeated compactions when they still fit", () => {
it("should skip repeated compactions when kept messages still fit", () => {
const u1 = createMessageEntry(createUserMessage("user msg 1 (summarized by compaction1)"));
const a1 = createMessageEntry(createAssistantMessage("assistant msg 1"));
const u2 = createMessageEntry(createUserMessage("user msg 2 - kept by compaction1"));
@@ -408,29 +407,9 @@ describe("prepareCompaction with previous compaction", () => {
const a4 = createMessageEntry(createAssistantMessage("assistant msg 4", createMockUsage(8000, 2000)));
const pathEntries = [u1, a1, u2, a2, u3, a3, compaction1, u4, a4];
const contextBefore = buildSessionContext(pathEntries);
const preparation = prepareCompaction(pathEntries, DEFAULT_COMPACTION_SETTINGS);
expect(preparation).toBeDefined();
expect(preparation!.firstKeptEntryId).toBe(u2.id);
expect(preparation!.previousSummary).toBe("First summary");
expect(extractText(preparation!.messagesToSummarize)).not.toContain("First summary");
expect(preparation!.tokensBefore).toBe(estimateContextTokens(contextBefore.messages).tokens);
const compaction2: CompactionEntry = {
type: "compaction",
id: "compaction2-id",
parentId: a4.id,
timestamp: new Date().toISOString(),
summary: "Second summary",
firstKeptEntryId: preparation!.firstKeptEntryId,
tokensBefore: preparation!.tokensBefore,
};
const contextAfter = buildSessionContext([...pathEntries, compaction2]);
const contextAfterText = extractText(contextAfter.messages);
expect(contextAfterText).toContain("user msg 2 - kept by compaction1");
expect(contextAfterText).toContain("user msg 3 - kept by compaction1");
expect(preparation).toBeUndefined();
});
it("should re-summarize previously kept messages when the recent window moves past them", () => {