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The public filepacks artifact is a deterministic .fpk archive. It contains:
  • manifest.json as the first entry
  • payload files under payload/
The current public OSS surface uses generic format_version: 1 manifests only.

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What the artifact gives you

A .fpk file is designed to be:
  • portable as one file
  • inspectable through the manifest
  • verifiable against the payload
  • comparable against another artifact with deterministic rules

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What’s inside a .fpk file

A .fpk artifact has a fixed layout: 
manifest.json          ← canonical file inventory, always first
payload/results.json   ← payload file
payload/summary.txt    ← payload file
...
manifest.json records the artifact name, file count, total size, per-file hashes, and a payload digest. Those values are what inspect, verify, and compare operate on — no payload extraction needed for most operations.

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Why manifest-first packaging matters

The format is the trust anchor for the current OSS release:
  • the artifact is portable as one file
  • the manifest is the canonical file inventory
  • verification is local and deterministic
  • comparison is manifest-driven, not filesystem-dependent
Because the format is deterministic, the archive digest is a meaningful identity. The same directory contents produce the same .fpk bytes, making the digest stable across machines and time.

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Public artifact guarantees

  • .fpk is a POSIX tar archive
  • manifest.json must appear exactly once
  • manifest.json must be the first entry
  • entries outside manifest.json and payload/ are invalid
  • payload entries must be regular files
  • directory entries must not be emitted
  • payload paths must be normalized relative paths

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Which artifact page to read next

If you need…Read
field-by-field manifest detailsManifest
archive layout and path rulesFormat
determinism guarantees and why they matterDeterminism

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See also

  1. Manifest
  2. Format
  3. Determinism