Failed to parse JSON for tool call 'replace_string_in_file': SyntaxError

Asked "Claude Sonnet 4.6" to refactor the code:

(there is no C:\snapshot\copilot-intellij\lib\src\openai\ folder, or even C:\snapshot\, folder

eclipse.buildId=4.39.0.20260305-0817
java.version=21.0.10
java.vendor=Eclipse Adoptium
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_CA
Framework arguments:  -product org.eclipse.epp.package.rcp.product
Command-line arguments:  -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.rcp.product -data file:/E:/workspaces/JiraConnector/

Copilot: 0.15.0

!ENTRY org.eclipse.lsp4e 4 0 2026-03-17 00:29:03.334
!MESSAGE [LS:GitHub Copilot Language Server][Error]	[toolCallingLoop] Fetch failed: {
  type: 'failed',
  reason: "Error on conversation request: Failed to parse JSON for tool call 'replace_string_in_file': SyntaxError: Expected ',' or '}' after property value in JSON at position 235 (line 1 column 236)\n" +
    '    at JSON.parse (<anonymous>)\n' +
    '    at parseCallArguments (C:\\snapshot\\copilot-intellij\\lib\\src\\openai\\stream.ts:805:21)\n' +
    '    at extractToolCalls (C:\\snapshot\\copilot-intellij\\lib\\src\\openai\\stream.ts:8... Read more from logs.',
  requestId: '4c2a9f24-1263-4f82-8100-e18f50ba34ae'
}

!ENTRY org.eclipse.lsp4e 4 0 2026-03-17 00:29:03.334
!MESSAGE [LS:GitHub Copilot Language Server][Error]	[chat] Error on conversation request: Error: Failed to parse JSON for tool call 'replace_string_in_file': SyntaxError: Expected ',' or '}' after property value in JSON at position 235 (line 1 column 236)
    at JSON.parse (<anonymous>)
    at parseCallArguments (C:\snapshot\copilot-intellij\lib\src\openai\stream.ts:805:21)
    at extractToolCalls (C:\snapshot\copilot-intellij\lib\src\openai\stream.ts:821:26)
    at convertToAPIJsonData (C:\snapshot\copilot-intellij\lib\src\openai\stream.ts:751:23)
    at prepareChatCompletionForReturn (C:\snapshot\copilot-intellij\lib\src\conversation\openai\stream.ts:28:35)
    at selector (C:\snapshot\copilot-intellij\lib\src\conversation\endpoint\ChatCompletionsEndpointStrategy.ts:202:13)
    at asyncIterableMap (C:\snapshot\copilot-intellij\lib\src\common\iterableHelpers.ts:6:15)
    at process.item (node:internal/process/task_queues:105:5)
    at chatCompletion (C:\snapshot\copilot-intellij\lib\src\common\iterableHelpers.ts:25:22)
    at ea.processSuccessfulResponse (C:\snapshot\copilot-intellij\lib\src\conversation\chatMLFetcher.ts:392:26). Input: '{"explanation": "Update JsonWeakParser to throw JsonProcessingException instead of JSONException", "filePath": "E:\\git\\JiraConnector\\jrjc-core\\src\\main\\java\\me\\glindholm\\jira\\rest\\client\\internal\\json\\JsonWeakParser.java"'
    at parseCallArguments (C:\snapshot\copilot-intellij\lib\src\openai\stream.ts:810:15)
    at extractToolCalls (C:\snapshot\copilot-intellij\lib\src\openai\stream.ts:821:26)
    at convertToAPIJsonData (C:\snapshot\copilot-intellij\lib\src\openai\stream.ts:751:23)
    at prepareChatCompletionForReturn (C:\snapshot\copilot-intellij\lib\src\conversation\openai\stream.ts:28:35)
    at selector (C:\snapshot\copilot-intellij\lib\src\conversation\endpoint\ChatCompletionsEndpointStrategy.ts:202:13)
    at asyncIterableMap (C:\snapshot\copilot-intellij\lib\src\common\iterableHelpers.ts:6:15)
    at process.item (node:internal/process/task_queues:105:5)
    at chatCompletion (C:\snapshot\copilot-intellij\lib\src\common\iterableHelpers.ts:25:22)
    at ea.processSuccessfulResponse (C:\snapshot\copilot-intellij\lib\src\conversation\chatMLFetcher.ts:392:26)
    at ea.fetch (C:\snapshot\copilot-intellij\lib\src\conversation\chatMLFetcher.ts:349:28)

!ENTRY com.microsoft.copilot.eclipse 4 0 2026-03-17 00:29:04.041
!MESSAGE [Error] Failed to persist conversation progress: 4d1ae4b7-3b64-47a2-8e2b-5da1845cf3c5
!STACK 0
java.io.IOException: Failed to load conversation index document
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.updateConversationIndex(ConversationPersistenceService.java:146)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.saveConversation(ConversationPersistenceService.java:95)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceManager.persistAndCacheConversation(ConversationPersistenceManager.java:398)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceManager.lambda$4(ConversationPersistenceManager.java:224)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)
Caused by: org.xml.sax.SAXParseException; lineNumber: 11; columnNumber: 201; XML document structures must start and end within the same entity.
	at java.xml/com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:262)
	at java.xml/com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:342)
	at java.xml/javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:122)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.loadIndexDocument(ConversationPersistenceService.java:242)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.loadOrCreateIndexDocument(ConversationPersistenceService.java:230)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.updateConversationIndex(ConversationPersistenceService.java:142)
	... 10 more

!ENTRY com.microsoft.copilot.eclipse 4 0 2026-03-17 00:29:04.077
!MESSAGE [Error] Failed to update todo list for conversation: 4d1ae4b7-3b64-47a2-8e2b-5da1845cf3c5
!STACK 0
java.io.IOException: Failed to load conversation index document
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.updateConversationIndex(ConversationPersistenceService.java:146)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.saveConversation(ConversationPersistenceService.java:95)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceManager.persistAndCacheConversation(ConversationPersistenceManager.java:398)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceManager.lambda$10(ConversationPersistenceManager.java:457)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)
Caused by: org.xml.sax.SAXParseException; lineNumber: 11; columnNumber: 201; XML document structures must start and end within the same entity.
	at java.xml/com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:262)
	at java.xml/com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:342)
	at java.xml/javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:122)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.loadIndexDocument(ConversationPersistenceService.java:242)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.loadOrCreateIndexDocument(ConversationPersistenceService.java:230)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.updateConversationIndex(ConversationPersistenceService.java:142)
	... 10 more

!ENTRY com.microsoft.copilot.eclipse 4 0 2026-03-17 00:29:04.079
!MESSAGE [Error] Failed to persist model info for conversation: 4d1ae4b7-3b64-47a2-8e2b-5da1845cf3c5
!STACK 0
java.io.IOException: Failed to load conversation index document
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.updateConversationIndex(ConversationPersistenceService.java:146)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.saveConversation(ConversationPersistenceService.java:95)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceManager.persistAndCacheConversation(ConversationPersistenceManager.java:398)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceManager.lambda$12(ConversationPersistenceManager.java:526)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)
Caused by: org.xml.sax.SAXParseException; lineNumber: 11; columnNumber: 201; XML document structures must start and end within the same entity.
	at java.xml/com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:262)
	at java.xml/com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:342)
	at java.xml/javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:122)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.loadIndexDocument(ConversationPersistenceService.java:242)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.loadOrCreateIndexDocument(ConversationPersistenceService.java:230)
	at com.microsoft.copilot.eclipse.core.persistence.ConversationPersistenceService.updateConversationIndex(ConversationPersistenceService.java:142)
	... 10 more

Start with the logged parseCallArguments and extractToolCalls locations in stream.ts, then inspect ConversationPersistenceService.java around updateConversationIndex and loadIndexDocument. Reproduce the failed replace_string_in_file request in the reported Eclipse environment and verify that tool-call handling completes without the JSON error and conversation persistence no longer reports malformed XML.