{"record":{"id":"75358927e9dd85ac","repo":"vercel/ai","slug":"acp-skillsdirectory-json-stringify-skillsdirecto","errorCode":null,"errorMessage":"ACP skillsDirectory ${JSON.stringify(skillsDirectory)} must be a relative POSIX path without traversal.","messagePattern":"ACP skillsDirectory (.+?) must be a relative POSIX path without traversal\\.","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"packages/harness-acp/src/v1/acp-v1-skills.ts","lineNumber":88,"sourceCode":"  skillsDirectory?: string;\n  sessionWorkDir: string;\n}): string {\n  const containsTraversal = skillsDirectory\n    .split(/[\\\\/]/)\n    .some(segment => segment === '..');\n  const normalizedDirectory = path.posix.normalize(skillsDirectory);\n  if (\n    skillsDirectory.length === 0 ||\n    skillsDirectory.includes('\\\\') ||\n    path.posix.isAbsolute(skillsDirectory) ||\n    path.win32.isAbsolute(skillsDirectory) ||\n    containsTraversal ||\n    normalizedDirectory === '.' ||\n    normalizedDirectory.startsWith('../') ||\n    normalizedDirectory.includes('/../') ||\n    normalizedDirectory.endsWith('/..')\n  ) {\n    throw new Error(\n      `ACP skillsDirectory ${JSON.stringify(skillsDirectory)} must be a relative POSIX path without traversal.`,\n    );\n  }\n\n  const rootDir = path.posix.join(implementationHomeDir, normalizedDirectory);\n  assertOutsideSessionWorkDir({ rootDir, sessionWorkDir });\n  return rootDir;\n}\n\nfunction validateACPSkills({\n  skills,\n}: {\n  skills: ReadonlyArray<HarnessV1Skill>;\n}): void {\n  const skillNames = new Set<string>();\n  for (const skill of skills) {\n    if (\n      !ACP_SKILL_NAME_PATTERN.test(skill.name) ||","sourceCodeStart":70,"sourceCodeEnd":106,"githubUrl":"https://github.com/vercel/ai/blob/69428b1f8b037e4d118fb4853428d5c4e620493c/packages/harness-acp/src/v1/acp-v1-skills.ts#L70-L106","documentation":"Error \"ACP skillsDirectory ${JSON.stringify(skillsDirectory)} must be a relative POSIX path without traversal.\" thrown in vercel/ai.","triggerScenarios":"Thrown at packages/harness-acp/src/v1/acp-v1-skills.ts:88 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":"69428b1f8b037e4d118fb4853428d5c4e620493c","analyzedAt":"2026-08-30T12:32:21.016Z","schemaVersion":2},"datasetVersion":"2026-08-30T13:17:10.514Z"}