Two tools with clear, detailed descriptions (194 - 250 chars, well above baseline 34 - 392 range). Input schemas present with type definitions. However, output schemas are completely undocumented, LLMs cannot plan downstream calls or extract results. No parameter descriptions beyond the tool level. Error handling is implicit (exit codes 0/1/2) but not actionable for LLM recovery. No tool annotations (readOnlyHint/destructiveHint). Tool naming is verb-forward (validate_*, rebuild_*) and unambiguous. Composition is sound: two separate concerns, no 'and' coupling. Missing: per-parameter descriptions, output schema documentation, error recovery guidance.

• Document output schemas for both tools. E.g., validate_pack returns {success: bool, checks_passed: int, failed_check: string|null, error_message: string}. rebuild_index returns {index_path: string, stats_path: string, packs_indexed: int, generated_at: string}.
• Add per-parameter descriptions: 'pack_tar_path: Absolute or relative path to the pack tarball (format: pack_id-X.Y.Z.tar). Must exist and be readable.' and 'registry_root: Absolute path to registry root. Defaults to current working directory if omitted.'
• Replace exit codes with structured error responses. E.g., {success: false, error_code: 'TARBALL_CORRUPT', error_message: 'Tarball integrity check failed: CRC mismatch', recovery_hint: 'Verify the tarball was not truncated during upload. Re-download and retry.'}
• Add tool annotations: validate_pack with readOnlyHint=true; rebuild_index with destructiveHint=true, idempotentHint=true (per docstring).
• Clarify registry_root constraints: 'Must be an absolute path or relative to the current working directory. Must contain a packs/ subdirectory. If omitted, uses os.getcwd().' Add validation to reject relative paths that escape the registry root.