refactor(agent): trim obsolete loop surfaces

packages/llm/llm-retry/src/index.ts

@@ -176,6 +176,14 @@ export function apply(ctx: Context, config: Config = {}, internals: RetryInterna
     retries.delete(agent)
   })
 
+  // A completed model response ends the consecutive-failure sequence even
+  // when its tool calls keep the turn running into another request.
+  ctx.on('session/event', (session, event) => {
+    if (event.type !== 'assistant/message') return
+    const agent = ctx.agents.get(session.id)
+    if (agent?.session === session) retries.delete(agent)
+  })
+
   const disposeListener = ctx.on('agent/request-error', (
     agent: Agent,
     turn: number,

packages/llm/llm-retry/src/invariant.ts

@@ -88,7 +88,9 @@ function validateRetry(
   }
 
   const chainStart = retryChainStart(history, turn)
-  const chainRetries = history.slice(Math.max(chainStart, 0))
+  const chain = history.slice(Math.max(chainStart, 0))
+  const lastSuccess = chain.findLastIndex(prior => prior.type === 'assistant/message')
+  const chainRetries = chain.slice(lastSuccess + 1)
     .filter((prior): prior is SessionEvent<'llm/retry'> => prior.type === 'llm/retry')
   if (chainRetries.some(prior => prior.data.turn === turn && prior.data.step === step)) {
     fail(`llm/retry duplicates the retry record for turn ${turn}/step ${step}`)