DataDesigner/docs/code_reference/engine/seed_readers.md
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# Seed Readers
Seed readers are engine-side adapters that turn a configured seed source into tabular seed rows. The engine attaches a `SeedSource` and secret resolver, asks the reader for column names and dataset size, then streams batches into generation.
Related pages: [seeds](../config/seeds.md), [Seed Datasets](../../concepts/seed-datasets.md), and [Build Your Own](../../plugins/build_your_own.md).
## Core Contracts
### `SeedReader` {#data_designer.engine.resources.seed_reader.SeedReader}
::: data_designer.engine.resources.seed_reader.SeedReader
options:
show_root_toc_entry: false
### `FileSystemSeedReader` {#data_designer.engine.resources.seed_reader.FileSystemSeedReader}
::: data_designer.engine.resources.seed_reader.FileSystemSeedReader
options:
show_root_toc_entry: false
### `SeedReaderFileSystemContext` {#data_designer.engine.resources.seed_reader.SeedReaderFileSystemContext}
::: data_designer.engine.resources.seed_reader.SeedReaderFileSystemContext
options:
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### `SeedReaderBatch` {#data_designer.engine.resources.seed_reader.SeedReaderBatch}
::: data_designer.engine.resources.seed_reader.SeedReaderBatch
options:
show_root_toc_entry: false
### `SeedReaderBatchReader` {#data_designer.engine.resources.seed_reader.SeedReaderBatchReader}
::: data_designer.engine.resources.seed_reader.SeedReaderBatchReader
options:
show_root_toc_entry: false
### `PandasSeedReaderBatch` {#data_designer.engine.resources.seed_reader.PandasSeedReaderBatch}
::: data_designer.engine.resources.seed_reader.PandasSeedReaderBatch
options:
show_root_toc_entry: false
### `create_seed_reader_output_dataframe` {#data_designer.engine.resources.seed_reader.create_seed_reader_output_dataframe}
::: data_designer.engine.resources.seed_reader.create_seed_reader_output_dataframe
options:
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## Built-In Readers
### `LocalFileSeedReader` {#data_designer.engine.resources.seed_reader.LocalFileSeedReader}
::: data_designer.engine.resources.seed_reader.LocalFileSeedReader
options:
show_root_toc_entry: false
### `HuggingFaceSeedReader` {#data_designer.engine.resources.seed_reader.HuggingFaceSeedReader}
::: data_designer.engine.resources.seed_reader.HuggingFaceSeedReader
options:
show_root_toc_entry: false
### `DataFrameSeedReader` {#data_designer.engine.resources.seed_reader.DataFrameSeedReader}
::: data_designer.engine.resources.seed_reader.DataFrameSeedReader
options:
show_root_toc_entry: false
### `DirectorySeedReader` {#data_designer.engine.resources.seed_reader.DirectorySeedReader}
::: data_designer.engine.resources.seed_reader.DirectorySeedReader
options:
show_root_toc_entry: false
### `FileContentsSeedReader` {#data_designer.engine.resources.seed_reader.FileContentsSeedReader}
::: data_designer.engine.resources.seed_reader.FileContentsSeedReader
options:
show_root_toc_entry: false
### `AgentRolloutSeedReader` {#data_designer.engine.resources.seed_reader.AgentRolloutSeedReader}
::: data_designer.engine.resources.seed_reader.AgentRolloutSeedReader
options:
show_root_toc_entry: false
## Registry and Errors
### `SeedReaderRegistry` {#data_designer.engine.resources.seed_reader.SeedReaderRegistry}
::: data_designer.engine.resources.seed_reader.SeedReaderRegistry
options:
show_root_toc_entry: false
### `SeedReaderError` {#data_designer.engine.resources.seed_reader.SeedReaderError}
::: data_designer.engine.resources.seed_reader.SeedReaderError
options:
show_root_toc_entry: false