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feat(compact): recover context overflow (PR3 phase 2)

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Hypatia May
2026-07-15 16:50:44 +08:00
parent e8d066f750
commit 12484104c8
46 changed files with 913 additions and 242 deletions
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16
packages/core/agent-loop/tests/interception.spec.ts
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@@ -118,7 +118,7 @@ describe('agent/prompt-submit', () => {
it('a prompt-submit rewrite + additionalContext is VISIBLE to the agent/pre-step seam (merged ordering)', async () => {
// Prompt rewrites and injected context land before `agent/pre-step`, so a
// compaction listener measures the current surface before the single derive.
// surface listener sees the current state before the single derive.
const adapter = new MockAdapter([textResponse('ok')])
const ctx = await harness(adapter)
const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
@@ -130,8 +130,7 @@ describe('agent/prompt-submit', () => {
additionalContext: { content: [{ type: 'text', text: 'injected ctx' }], source: { kind: 'plugin', plugin: 'test' } },
}))
// The pre-step seam (where compaction lives) derives the surface it would act
// on. Capture what it sees on the first step.
// Capture the surface visible at the generic pre-step seam on the first step.
let preStepDerived: string | undefined
ctx.on('agent/pre-step', (subject, _turn, step) => {
if (subject === agent && step === 1) preStepDerived = JSON.stringify(subject.session.deriveMessages())
@@ -375,7 +374,7 @@ describe('agent/session-prefix', () => {
expect(agent.session.deriveMessages()[0]).toEqual({ role: 'user', content: [{ type: 'text', text: 'go' }] })
})
it('composes before the first pre-step and hands the prefix to the seam (pressure gates see the real value)', async () => {
it('composes before the first pre-step and records the prefix on the request header', async () => {
const adapter = new MockAdapter([textResponse('ok')])
const ctx = await harness(adapter)
const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
@@ -386,20 +385,15 @@ describe('agent/session-prefix', () => {
order.push('compose')
return [reminder, ...await next()]
})
const seen: (readonly Message[])[] = []
ctx.on('agent/pre-step', (_agent, _turn, _step, _system, sessionPrefix) => {
ctx.on('agent/pre-step', () => {
order.push('pre-step')
seen.push(sessionPrefix)
})
send(agent, 'hi')
await waitForIdle(ctx, agent)
// Composition precedes the pre-step seam, and the seam receives THIS
// instance's composed prefix — a token-pressure gate (compaction) counts
// what the request will actually carry, never a stale logged prefix.
expect(order).toEqual(['compose', 'pre-step'])
expect(seen[0]).toEqual([reminder])
expect(agent.session.requestHeader()?.messagePrefix).toEqual([reminder])
})
it('the canonical prepend pattern composes contributions in registration order', async () => {