{"record":{"id":"850a99d2ea79c0ee","repo":"deepseek-ai/deepseek-harness","slug":"tool-result-surface-replacement-must-rewrite-exact","errorCode":null,"errorMessage":"tool/result surface replacement must rewrite exactly one current node","messagePattern":"tool/result surface replacement must rewrite exactly one current node","errorType":"validation","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"packages/core/session/src/surface.ts","lineNumber":295,"sourceCode":"    return a.every((item, i) => isDeepEqualJson(item, b[i]))\n  }\n  if (typeof a !== 'object' || typeof b !== 'object' || a === null || b === null) return false\n  const aKeys = Object.keys(a)\n  const bRecord = b as Record<string, unknown>\n  if (aKeys.length !== Object.keys(b).length) return false\n  return aKeys.every(key => Object.hasOwn(b, key) && isDeepEqualJson((a as Record<string, unknown>)[key], bRecord[key]))\n}\n\n/** Restrict a tool-result replacement to one current result's content. */\nfunction assertToolResultRewrite(\n  event: SessionEvent,\n  shadowedSeqs: readonly number[],\n  events: readonly SessionEvent[],\n  baseSeq: number,\n): void {\n  if (event.type !== 'tool/result') return\n  if (shadowedSeqs.length !== 1) {\n    throw new Error('tool/result surface replacement must rewrite exactly one current node')\n  }\n  for (const originalSeq of shadowedSeqs) {\n    const original = events[originalSeq - baseSeq]\n    if (original?.type !== 'tool/result') {\n      throw new Error('tool/result surface replacement must target a current tool/result')\n    }\n    const originalRest = { ...original.data } as Record<string, unknown>\n    const replacementRest = { ...event.data } as Record<string, unknown>\n    const originalResult = original.data.message.content[0]\n    const replacementResult = event.data.message.content[0]\n    originalRest['message'] = {\n      ...original.data.message,\n      content: [{ ...originalResult, content: null }],\n    }\n    replacementRest['message'] = {\n      ...event.data.message,\n      content: [{ ...replacementResult, content: null }],\n    }","sourceCodeStart":277,"sourceCodeEnd":313,"githubUrl":"https://github.com/deepseek-ai/deepseek-harness/blob/b150a551b8d465e31e418e1b2eaf5e79bbb7d28e/packages/core/session/src/surface.ts#L277-L313","documentation":"Error \"tool/result surface replacement must rewrite exactly one current node\" thrown in deepseek-ai/deepseek-harness.","triggerScenarios":"Thrown at packages/core/session/src/surface.ts:295 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"b150a551b8d465e31e418e1b2eaf5e79bbb7d28e","analyzedAt":"2026-08-24T18:12:29.105Z","schemaVersion":2},"datasetVersion":"2026-08-24T22:17:12.610Z"}