Ccfg Mongodb

This skill should be used when working on MongoDB databases, designing document schemas, creating collections, or reviewing MongoDB code. It provides document modeling rules, BSON type guidance, collection design conventions, JSON Schema validator patterns, and existing repository compatibility checks for consistent MongoDB development.

This skill should be used when planning MongoDB sharding, selecting shard keys, configuring zone sharding, or diagnosing sharding performance issues. It provides shard key selection criteria covering cardinality, frequency, and monotonicity analysis, hashed vs ranged sharding trade-offs, zone sharding patterns for multi-tenancy and data residency, scatter-gather avoidance techniques, and chunk management best practices.

This skill should be used when writing MongoDB aggregation pipelines, using $lookup, $group, $merge, or optimizing pipeline performance. It provides pipeline stage ordering rules, $lookup vs app-side join guidance, $facet patterns, $merge for materialized views, pipeline optimization techniques, and $out vs $merge comparisons.