# Review Config Backcompat > Review Apache Pinot diffs for configuration and backward-compatibility risks. Covers config key renames, SPI signature changes, schema/enum additions, feature-flag defaults, multi-level config override validation, rolling-upgrade safety, REST/JSON/Protobuf field evolution, and segment/DataTable format versioning. Trigger keywords — config key, config rename, SPI, feature flag, enum, schema type, DataTable version, segment version, Protobuf, Thrift, REST endpoint, @Deprecated, mixed-version, rolling upgrade, ZooKeeper schema. Use when this capability is needed. - Skill: `tomevault-io/review-config-backcompat` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/review-config-backcompat` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/review-config-backcompat/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Integrations & APIs - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/review-config-backcompat --- # Skill: review-config-backcompat Procedure: see [`kb/skills/review-config-backcompat.md`](../../../kb/skills/review-config-backcompat.md). Read it first, then follow it. --- > Source: [apache/pinot](https://github.com/apache/pinot) — distributed by [TomeVault](https://tomevault.io).