{"record":{"id":"3da7e56438a8157c","repo":"deepseek-ai/deepseek-harness","slug":"session-header-parentsession-must-be-a-string","errorCode":null,"errorMessage":"session header parentSession must be a string","messagePattern":"session header parentSession must be a string","errorType":"validation","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"packages/core/session/src/index.ts","lineNumber":119,"sourceCode":"  if (record.version !== SESSION_FORMAT_VERSION) {\n    throw new Error(`session header version must be ${SESSION_FORMAT_VERSION}, got ${String(record.version)}`)\n  }\n  if (record.id !== id) {\n    throw new Error(`session header id \"${String(record.id)}\" does not match session id \"${id}\"`)\n  }\n  if (typeof record.createdAt !== 'number'\n    || !Number.isSafeInteger(record.createdAt)\n    || record.createdAt < 0) {\n    throw new Error('session header createdAt must be a non-negative safe integer')\n  }\n  if (record.cwd !== undefined) {\n    if (typeof record.cwd !== 'string') throw new Error('session header cwd must be a string')\n    if (!isAbsolute(record.cwd)) {\n      throw new Error(`session header cwd must be an absolute path, got \"${record.cwd}\"`)\n    }\n  }\n  if (record.parentSession !== undefined && typeof record.parentSession !== 'string') {\n    throw new Error('session header parentSession must be a string')\n  }\n  if (record.seedLength !== undefined\n    && (typeof record.seedLength !== 'number' || !Number.isSafeInteger(record.seedLength) || record.seedLength < 0)) {\n    throw new Error('session header seedLength must be a non-negative safe integer')\n  }\n  if (record.origin !== undefined && record.origin !== 'subagent') {\n    throw new Error('session header origin must be \"subagent\"')\n  }\n  if (record.delegationDepth !== undefined\n    && (typeof record.delegationDepth !== 'number' || !Number.isSafeInteger(record.delegationDepth) || record.delegationDepth < 0)) {\n    throw new Error('session header delegationDepth must be a non-negative safe integer')\n  }\n  if (record.agentPreset !== undefined && typeof record.agentPreset !== 'string') {\n    throw new Error('session header agentPreset must be a string')\n  }\n  return deepFreeze(record as unknown as SessionHeader)\n}\n","sourceCodeStart":101,"sourceCodeEnd":137,"githubUrl":"https://github.com/deepseek-ai/deepseek-harness/blob/b150a551b8d465e31e418e1b2eaf5e79bbb7d28e/packages/core/session/src/index.ts#L101-L137","documentation":"Error \"session header parentSession must be a string\" thrown in deepseek-ai/deepseek-harness.","triggerScenarios":"Thrown at packages/core/session/src/index.ts:119 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Store parentSession as a string in the session header."],"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"}