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CodeTracked since May 19, 2026

Add binary file download API to the Sandbox abstraction

This pull request introduces a new `Sandbox.download_file` interface for binary retrieval and implements it in both `AioSandbox` and `LocalSandbox`, creating a consistent way to fetch raw file contents from sandboxed runs; it also adds tests covering normal, empty, lock-aware, error, and single-chunk download paths to make the behavior explicit and regressions easier to catch.

SandboxAioSandboxLocalSandboxdownload_file

What Happened

  • This pull request introduces a new `Sandbox.download_file` interface for binary retrieval and implements it in both `AioSandbox` and `LocalSandbox`, creating a consistent way to fetch raw file contents from sandboxed runs; it also adds tests covering normal, empty, lock-aware, error, and single-chunk download paths to make the behavior explicit and regressions easier to catch.
  • This pull request introduces a new `Sandbox.download_file` interface for binary retrieval and implements it in both `AioSandbox` and `LocalSandbox`, creating a consistent way to fetch raw file contents from sandboxed runs; it also adds tests covering normal, empty, lock-aware, error, and single-chunk download paths to make the behavior explicit and regressions easier to catch.
  • 1 evidence item attached for review.

What is Different

Before

Scattered source updates, isolated context, and manual follow-up across multiple feeds.

Now

Adds a concrete binary-file retrieval capability by defining a new abstract sandbox method and implementing it in the two built-in sandboxes, which removes the need for ad-hoc export logic when consuming generated artifacts.

Why Track This

Why It Matters

Developers and operators using bytedance/deer-flow can now pull generated artifacts (such as images or outputs) directly from sandbox environments, reducing custom integration work and improving reliability of downstream pipelines that depend on file-based results. The technical impact is a standardized `download_file` path in both local and async sandboxes, so teams should watch for compatibility of custom sandbox backends, large-file transfer behavior, and lock/error path consistency as workloads increase.

Impact

Developers and operators using bytedance/deer-flow can now pull generated artifacts (such as images or outputs) directly from sandbox environments, reducing custom integration work and improving reliability of downstream pipelines that depend on file-based results. The technical impact is a standardized `download_file` path in both local and async sandboxes, so teams should watch for compatibility of custom sandbox backends, large-file transfer behavior, and lock/error path consistency as workloads increase.

What To Watch Next

  • Watch whether Sandbox becomes a repeated pattern.
  • Track follow-up changes around AI Image Generation.
  • Compare future signals against this evidence trail.
  • Re-check risk flags: custom_sandbox_adapters_missing_download_file, large_file_download_failure_modes.
Open Topic TimelineOpen Technical EventOpen Original Sourcecustom_sandbox_adapters_missing_download_file / large_file_download_failure_modes / lock_and_error_handling_drift

Supporting Evidence

GITHUB PULL REQUESTHigh Trust

bytedance/deer-flow PR #3038: feat(sandbox) Adds download file interface in Sandbox

bytedance/deer-flow PR #3038 adds `download_file` to `Sandbox` and wires it into the async and local sandbox implementations, with expanded unit coverage.