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yao-meta-skill/references/packaging-contracts.md
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2026-04-01 09:55:55 +08:00

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# Packaging Contracts
`cross_packager.py` is not just an export helper. It defines and validates platform contracts.
## Current Targets
- `openai`
- `claude`
- `generic`
## Contract Shape
Each target contract defines:
- required output fields
- required output files
- field mapping from the neutral source metadata
- portable execution metadata
- trust-boundary metadata
- degradation strategy metadata
## Failure Handling
When `--expectations` is provided:
- missing required files cause exit code `2`
- missing required fields cause exit code `2`
- validation failures are emitted in the JSON report
## Source Of Truth
The neutral source remains:
- `SKILL.md`
- `agents/interface.yaml`
Target-specific metadata is generated at packaging time.
## Portability Model
The packaging layer now preserves four portable semantics from the neutral source:
- activation
- execution
- trust
- degradation
This means portability is not just "can it export a file?" but also "does the exported target preserve the source package's activation and safety assumptions?"