diff --git a/packages/compact/compact-basic/src/index.ts b/packages/compact/compact-basic/src/index.ts
index b77ebebc76..5d325d57ba 100644
--- a/packages/compact/compact-basic/src/index.ts
+++ b/packages/compact/compact-basic/src/index.ts
@@ -9,7 +9,7 @@ import z from 'schemastery'
 import { CompactService } from '@deepseek-ai/dsh-compact'
 import type { CompactionResult, CompactionTrigger } from '@deepseek-ai/dsh-compact'
 import type { Session } from '@deepseek-ai/dsh-session'
-import { CONTEXT_WINDOW_EXCEEDED_CODE } from '@deepseek-ai/dsh-llm'
+import { CONTEXT_WINDOW_EXCEEDED_CODE, assertNever } from '@deepseek-ai/dsh-llm'
 import type { ContentBlock } from '@deepseek-ai/dsh-llm'
 import type { Agent } from '@deepseek-ai/dsh-agent'
 import { resolveConfig } from './config.ts'
@@ -152,11 +152,18 @@ export class BasicCompactService extends CompactService {
     const model = routedModel(agent.session)
     if (model === undefined) return null
     const meter = this.ctx.tokenMeter
-    if (trigger === 'context-overflow') {
-      const measurement = meter.measure(agent.session)
-      const range = selectCompactableRange(agent.session, measurement, 0)
-      if (range === null) return null
-      return this.compactRegion(range.start, range.end, agent, signal)
+    switch (trigger) {
+      case 'context-overflow': {
+        const measurement = meter.measure(agent.session)
+        const range = selectCompactableRange(agent.session, measurement, 0)
+        if (range === null) return null
+        return this.compactRegion(range.start, range.end, agent, signal)
+      }
+      case 'pressure':
+        break
+      /* v8 ignore next -- closed-union exhaustiveness guard */
+      default:
+        assertNever(trigger, 'compaction trigger')
     }
 
     const threshold = Math.floor(meter.contextWindow * this.config.thresholdRatio)
diff --git a/packages/core/agent-loop/src/loop.ts b/packages/core/agent-loop/src/loop.ts
index 54cbbc6bdd..08c1ab9412 100644
--- a/packages/core/agent-loop/src/loop.ts
+++ b/packages/core/agent-loop/src/loop.ts
@@ -8,7 +8,7 @@
 import type { Context } from 'cordis'
 import type { ContentBlock, FinishReason, GenerateOptions, LlmCallConfig, Message } from '@deepseek-ai/dsh-llm'
 import { isDeepStrictEqual } from 'node:util'
-import { BlockAssembler, HarnessError, deepFreeze, isLlmAdapterFailure } from '@deepseek-ai/dsh-llm'
+import { BlockAssembler, HarnessError, assertNever, deepFreeze, isLlmAdapterFailure } from '@deepseek-ai/dsh-llm'
 import { agentEvents, assembleContextFor } from '@deepseek-ai/dsh-agent'
 import type { AgentEventDispatch, ContinuationDecision, HookContext, PromptDecision, RequestError, RequestErrorDecision } from '@deepseek-ai/dsh-agent'
 import { canonicalHeader } from '@deepseek-ai/dsh-session'
@@ -392,11 +392,17 @@ async function runTurn(
             : { kind: 'aborted', reason: String(abort.signal.reason) }
           break
         }
-        if (recoveryDecision.action === 'retry') {
-          requestRetryAttempt += 1
-          continue
+        switch (recoveryDecision.action) {
+          case 'retry':
+            requestRetryAttempt += 1
+            continue
+          case 'fail':
+            failTurn(stepOutcome.requestError)
+            break
+          /* v8 ignore next -- closed-union exhaustiveness guard */
+          default:
+            assertNever(recoveryDecision, 'agent request-error decision')
         }
-        failTurn(stepOutcome.requestError)
         break
       }