Entry point and router for YDB-related work. Orients an LLM about YDB — what it is, what surfaces it exposes, where to read upstream docs, which specialist skill to load for surface-specific questions. Covers SDK packages, connection strings and auth, local Docker, schema fundamentals, common integrations (ORMs, migration tools, Terraform), client-side balancing, and session lifecycle / resilience under rolling restart. Use when the user asks a general YDB question, mentions YDB without naming a specific surface (queries, topics, coordination), needs setup help, asks about balancing policies or `BAD_SESSION` / `shutdownHint` / rolling restart, or when another YDB skill needs foundational context. Also triggers on `grpcs://` / `grpc://`, `ydb profile`, `ydb scheme`, `balancers.RandomChoice`, `balancers.PreferNearestDC`, `ydb.WithBalancer`, `session-balancer`, and "getting started with YDB" prompts.
Writing and auditing code that runs YQL against YDB tables. Use when the user writes a query, designs a table or primary key, reads an `EXPLAIN`, or asks to review Java (ydb-java-sdk, ydb-jdbc-driver, Hibernate, Spring Data JPA), Go (`ydb-go-sdk/v3`), or C++ (`ydb-cpp-sdk`) application code that talks to YDB. Triggers on YQL keywords (`UPSERT`, `SELECT`, `DECLARE`, `AS_TABLE`, `VIEW <index>`, `CREATE TABLE`, `ALTER TABLE`, `EXPLAIN`), on the `BulkUpsert` SDK API, on JDBC / Hibernate / Spring symbols (`JpaRepository`, `findAllById`, `saveAll`, `deleteAllByIdInBatch`, `hibernate.jdbc.batch_size`, `@Version`, `@Retryable`, `SQLRecoverableException`, `SQLTransientException`), on `ydb-go-sdk/v3` symbols (`ydb.Open`, `db.Query().Do`, `db.Query().DoTx`, `db.Table().Do`, `query.WithIdempotent`, `query.WithCommit`, `query.WithStatsMode`, `query.Stats`, `query.StatsModeBasic`, `result.Close`, `ydb.WithLazyTx`, `ydb.ParamsBuilder`, `s.BeginTransaction`, `table.TxControl`, `table.BeginTx`, `BulkUpsertDataRows`, `balancer