fix: strip orphaned OpenAI reasoning blocks before responses API call (#55787)

Merged via squash.

Prepared head SHA: 263b952d88
Co-authored-by: suboss87 <11032439+suboss87@users.noreply.github.com>
Co-authored-by: jalehman <550978+jalehman@users.noreply.github.com>
Reviewed-by: @jalehman

CHANGELOG.md

@@ -9,6 +9,7 @@ Docs: https://docs.openclaw.ai
 ### Fixes
 
 - Control UI/cron: keep the runtime-only `last` delivery sentinel from being materialized into persisted cron delivery and failure-alert channel configs when jobs are created or edited. (#68829) Thanks @tianhaocui.
+- OpenAI/Responses: strip orphaned reasoning blocks before outbound Responses API calls so compacted or restored histories no longer fail on standalone reasoning items. (#55787) Thanks @suboss87.
 
 ## 2026.4.19-beta.2
 

src/agents/pi-embedded-helpers/openai.ts

@@ -207,6 +207,7 @@ export function downgradeOpenAIFunctionCallReasoningPairs(
  * is incomplete, drop the block to keep history usable.
  */
 export function downgradeOpenAIReasoningBlocks(messages: AgentMessage[]): AgentMessage[] {
+  let anyChanged = false;
   const out: AgentMessage[] = [];
 
   for (const msg of messages) {
@@ -259,6 +260,7 @@ export function downgradeOpenAIReasoningBlocks(messages: AgentMessage[]): AgentM
       continue;
     }
 
+    anyChanged = true;
     if (nextContent.length === 0) {
       continue;
     }
@@ -266,5 +268,5 @@ export function downgradeOpenAIReasoningBlocks(messages: AgentMessage[]): AgentM
     out.push({ ...assistantMsg, content: nextContent } as AgentMessage);
   }
 
-  return out;
+  return anyChanged ? out : messages;
 }

src/agents/pi-embedded-runner/run/attempt.ts

@@ -72,6 +72,7 @@ import {
 import type { EmbeddedContextFile } from "../../pi-embedded-helpers.js";
 import {
   downgradeOpenAIFunctionCallReasoningPairs,
+  downgradeOpenAIReasoningBlocks,
   isCloudCodeAssistFormatError,
   resolveBootstrapMaxChars,
   resolveBootstrapPromptTruncationWarningMode,
@@ -1367,7 +1368,10 @@ export async function runEmbeddedAttempt(
           if (!Array.isArray(messages)) {
             return inner(model, context, options);
           }
-          const sanitized = downgradeOpenAIFunctionCallReasoningPairs(messages as AgentMessage[]);
+          // Strip orphaned reasoning blocks first, then fix function-call
+          // pairing — matches the call order in google.ts.
+          const reasoningSanitized = downgradeOpenAIReasoningBlocks(messages as AgentMessage[]);
+          const sanitized = downgradeOpenAIFunctionCallReasoningPairs(reasoningSanitized);
           if (sanitized === messages) {
             return inner(model, context, options);
           }