Module codes 

Structured error codes emitted in the data.code field of every MCP error response. These are &'static str constants so callers can pattern-match them programmatically.

Constants

AGGREGATOR_ERROR

Returned when the query_aggregate tool receives a structurally inconsistent request (empty sources, ATTACH-limit exceeded, inner-without-group-by, etc.) — distinct from per-field validation errors (those use VALIDATION_ERROR) and from raw SQLite failures (those use STORAGE_ERROR).

ALIAS_ALREADY_EXISTS

Returned when alias_create is called but an alias with the same name already exists in the table’s _aliases storage.

ALIAS_NOT_FOUND

Returned when a named query alias does not exist in _aliases.

ALIAS_PARAMS_REQUIRED

Returned when alias_run is called without params but the alias has a non-null params_schema (i.e. the alias requires parameter injection).

ALIAS_TEMPLATE_ERROR

Returned when MiniJinja template rendering fails (syntax error or missing variable) during alias_run.

AMBIGUOUS_ID

Returned when an id prefix matches more than one row and the caller must disambiguate by using a longer prefix or the full UUID.

BACKUP_ERROR

Returned when a backup I/O or SQLite backup operation fails.

BATCH_ABORTED

Returned when schema_batch is aborted because one of its ops fails.

CONFIG_ERROR

Returned when environment-variable or .env configuration is invalid.

IO_ERROR

Returned when an I/O operation (file open, read) fails.

MATERIALIZE_DEST_INVALID

Returned when the row_materialize dest path is invalid for another reason.

MATERIALIZE_DEST_RELATIVE

Returned when the row_materialize dest path is relative (absolute required).

MATERIALIZE_EMPTY_RESULT

Returned when the filter in row_materialize matches zero rows.

MATERIALIZE_FIELD_UNKNOWN

Returned when a projected field name is not present in the schema.

MATERIALIZE_FORMAT_ERROR

Returned when serialization to the requested format fails during row_materialize.

MATERIALIZE_INVALID_PARAM

Returned when row_materialize parameters are structurally invalid.

MATERIALIZE_IO_ERROR

Returned when a file I/O error occurs during row_materialize.

MATERIALIZE_ROW_NOT_FOUND

Returned when the specified row id is not found during row_materialize.

MATERIALIZE_SHA256_ERROR

Returned when SHA-256 computation fails during row_materialize.

NOT_FOUND

Returned when a requested row does not exist.

SCHEMA_ERROR

Returned when schema.yaml cannot be parsed or is structurally invalid.

SCHEMA_EXISTS

Returned when a schema file already exists and schema_create would overwrite it.

SNAPSHOT_ERROR

Returned when a snapshot I/O or SQLite snapshot operation fails.

STORAGE_ERROR

Returned when a SQLite operation fails.

TABLE_NOT_FOUND

Returned when the requested table is not mounted in the registry.

TABLE_REQUIRED

Returned when table argument is required but was omitted.

VALIDATION_ERROR

Returned when a required field is missing or a value has the wrong type.