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refactor(core): simplify prompt cache diagnostics

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This commit is contained in:
Kit Langton 2026-07-24 13:01:51 -04:00
commit 34ed5bb399
2 changed files with 8 additions and 26 deletions
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30
packages/core/test/prompt-cache-diagnostics.test.ts
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@ -16,6 +16,8 @@ const request = LLM.request({
prompt: "First",
tools: [tool],
})
const compare = (current: LLMRequest) =>
PromptCacheDiagnostics.compare(PromptCacheDiagnostics.snapshot(request), PromptCacheDiagnostics.snapshot(current))
describe("PromptCacheDiagnostics", () => {
test("distinguishes initial and stable requests", () => {
@ -26,33 +28,18 @@ describe("PromptCacheDiagnostics", () => {
test("recognizes append-only history", () => {
const current = LLMRequest.update(request, { messages: [...request.messages, Message.assistant("Second")] })
expect(
PromptCacheDiagnostics.compare(
PromptCacheDiagnostics.snapshot(request),
PromptCacheDiagnostics.snapshot(current),
),
).toEqual({ status: "append-only", previousMessages: 1, currentMessages: 2 })
expect(compare(current)).toEqual({ status: "append-only", previousMessages: 1, currentMessages: 2 })
})
test("detects cache-sensitive setting changes", () => {
const current = LLMRequest.update(request, { generation: GenerationOptions.make({ temperature: 0.5 }) })
expect(
PromptCacheDiagnostics.compare(
PromptCacheDiagnostics.snapshot(request),
PromptCacheDiagnostics.snapshot(current),
),
).toEqual({ status: "changed", component: "settings", index: 0, label: "model settings" })
expect(compare(current)).toEqual({ status: "changed", component: "settings", index: 0, label: "model settings" })
})
test("finds the first changed prefix component", () => {
const changedTool = ToolDefinition.make({ ...tool, description: "Read one file" })
const current = LLMRequest.update(request, { tools: [changedTool] })
expect(
PromptCacheDiagnostics.compare(
PromptCacheDiagnostics.snapshot(request),
PromptCacheDiagnostics.snapshot(current),
),
).toMatchObject({ status: "changed", component: "tools", index: 0, label: "read" })
expect(compare(current)).toEqual({ status: "changed", component: "tools", index: 0, label: "read" })
})
test("treats appended tools as a prefix change", () => {
@ -62,11 +49,6 @@ describe("PromptCacheDiagnostics", () => {
inputSchema: { type: "object", properties: {} },
})
const current = LLMRequest.update(request, { tools: [...request.tools, write] })
expect(
PromptCacheDiagnostics.compare(
PromptCacheDiagnostics.snapshot(request),
PromptCacheDiagnostics.snapshot(current),
),
).toMatchObject({ status: "changed", component: "tools", index: 1, label: "write" })
expect(compare(current)).toEqual({ status: "changed", component: "tools", index: 1, label: "write" })
})
})