{"record":{"id":"fea5b2d00b9ffa3e","repo":"windmill-labs/windmill","slug":"failed-to-apply-code-changes-errormessage","errorCode":null,"errorMessage":"Failed to apply code changes: ${errorMessage}","messagePattern":"Failed to apply code changes: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"frontend/src/lib/components/copilot/chat/script/core.ts","lineNumber":833,"sourceCode":"\n\t\t\t// Apply the code changes directly\n\t\t\tawait helpers.applyCode(updatedCode, { applyAll: true, mode: 'apply' })\n\n\t\t\t// Show revert mode\n\t\t\tawait helpers.applyCode(oldCode, { mode: 'revert' })\n\n\t\t\ttoolCallbacks.setToolStatus(toolId, {\n\t\t\t\tcontent: `Code changes applied`,\n\t\t\t\tresult: 'Success'\n\t\t\t})\n\t\t\treturn `Applied changes to the script editor.`\n\t\t} catch (error) {\n\t\t\tconst errorMessage = error instanceof Error ? error.message : 'Unknown error occurred'\n\t\t\ttoolCallbacks.setToolStatus(toolId, {\n\t\t\t\tcontent: 'Failed to apply code changes',\n\t\t\t\terror: errorMessage\n\t\t\t})\n\t\t\tthrow new Error(`Failed to apply code changes: ${errorMessage}`)\n\t\t}\n\t}\n}\n\nexport const editCodeTool: Tool<ScriptChatHelpers> = {\n\tdef: EDIT_CODE_TOOL,\n\tstreamArguments: true,\n\tshowDetails: true,\n\tshowFade: true,\n\tfn: async function ({ args, helpers, toolCallbacks, toolId }) {\n\t\tconst scriptOptions = helpers.getScriptOptions()\n\n\t\tif (!scriptOptions) {\n\t\t\ttoolCallbacks.setToolStatus(toolId, {\n\t\t\t\tcontent: 'No script available to edit',\n\t\t\t\terror: 'No script found in current context'\n\t\t\t})\n\t\t\tthrow new Error(","sourceCodeStart":815,"sourceCodeEnd":851,"githubUrl":"https://github.com/windmill-labs/windmill/blob/e474e8803ce2ff5c2df09a58dab51d45f5c922ca/frontend/src/lib/components/copilot/chat/script/core.ts#L815-L851","documentation":"Catch-all wrapper around the edit-code apply phase: any error thrown while saving/applying diffs (including the old_string-not-found error above) is caught, surfaced via tool status, and rethrown as 'Failed to apply code changes: <original message>'.","triggerScenarios":"Any exception inside the apply/save block — unmatched old_string, exception writing the updated code back via scriptOptions/SaveService, or unexpected runtime error during sequential replacement.","commonSituations":"Chained diff failures; concurrent edits to the same script; storage/save errors when persisting the new code; the original cause is always embedded in the message, so read the suffix first.","solutions":["Read the original message after the colon — fix that underlying cause (usually index N old_string mismatch)","Re-read current code and retry with refreshed exact diffs","Check for concurrent edits/saves on the same script while the tool runs","If saving failed, verify write permissions and backend connectivity, then retry"],"exampleFix":"// diagnose: 'Failed to apply code changes: Diff at index 1: old_string \"...\" not found'\n// -> fix diff[1] to exactly match current code, then re-run the tool","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"try {\n  await editCode({ diffs, scriptOptions })\n} catch (e) {\n  const cause = e.message.replace('Failed to apply code changes: ', '')\n  if (/not found in code/.test(cause)) { /* refresh diffs and retry */ }\n  else { /* surface cause; check save permissions/connectivity */ }\n}","preventionTips":["Always parse the suffix of the message to find the real cause","Avoid concurrent edits to the same script while AI applies changes","Pre-validate diffs (see error 446) so the wrapper rarely fires"],"tags":["diffs","ai-copilot","error-wrapping"],"backgroundTag":"diff-application-failed","analyzedSha":"e474e8803ce2ff5c2df09a58dab51d45f5c922ca","analyzedAt":"2026-09-03T12:38:19.024Z","contentChangedAt":"2026-09-03T12:38:19.024Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}