5e4b9f8c6e
Signed-off-by: hsliu_ustc <hsliu_ustc@noreply.gitcode.com> Signed-off-by: Hongsheng Liu <liuhongsheng4@huawei.com> Co-authored-by: hsliu_ustc <hsliu_ustc@noreply.gitcode.com> Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
136 lines
4.4 KiB
Markdown
136 lines
4.4 KiB
Markdown
---
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title: Input, Output, and Modality Contracts
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kind: module
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status: draft
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architecture_state: current
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owners:
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- "@Sy0307"
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- "@amy-why-3459"
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- "@Gaohan123"
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- "@alex-jw-brooks"
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document_stewards:
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- "@hsliuustc0106"
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- "@Gaohan123"
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- "@david6666666"
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required_reviewers:
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- "@tzhouam"
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- "@linyueqian"
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- "@david6666666"
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- "@yenuo26"
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- "@NickCao"
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primary_code_paths:
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- vllm_omni/inputs/**
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- vllm_omni/outputs/**
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- vllm_omni/request.py
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- vllm_omni/data_entry_keys.py
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- vllm_omni/engine/messages.py
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- vllm_omni/engine/serialization.py
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- vllm_omni/engine/mm_outputs.py
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- vllm_omni/engine/output_modality.py
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- vllm_omni/engine/output_processor.py
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related_code_paths:
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- vllm_omni/model_executor/stage_input_processors/**
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- vllm_omni/core/sched/**
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- vllm_omni/distributed/omni_connectors/**
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- vllm_omni/diffusion/request.py
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- vllm_omni/diffusion/worker/request_batch.py
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- vllm_omni/errors.py
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depends_on:
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- error_contracts.md
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validation_paths:
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- tests/inputs/**
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- tests/engine/test_data_entry_keys.py
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- tests/engine/test_omni_request.py
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- tests/engine/test_omni_request_output.py
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- tests/engine/test_multimodal_accumulation.py
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- tests/engine/test_output_modality.py
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- tests/engine/test_output_processor.py
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- tests/engine/test_wire_multimodal_output.py
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- tests/utils/test_mm_outputs.py
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- tests/utils/test_mm_outputs_partition.py
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- tests/diffusion/test_diffusion_output_metadata.py
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upstream_refs:
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- vllm.inputs/**
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- vllm.outputs/**
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- vllm.v1.request.Request
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- vllm.v1.engine.EngineCoreRequest
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- vllm.v1.engine.EngineCoreOutput
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- vllm.v1.engine.output_processor.OutputProcessor
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invariant_namespace: IO-INV
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last_reviewed: 2026-08-07
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last_verified_commit: 3d7fc3b9ba3cac88d579d4dc35b78b0b641675fc
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---
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# Input, output, and modality contracts
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These contracts define the data that may cross entrypoint, orchestration,
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stage, connector, and model boundaries.
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## Contract status
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This document is a draft description of the current request, message,
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serialization, modality, accumulation, and output types. It does not assign
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semantic error ownership to the wire schema.
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## Ownership boundary
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This document owns request identity, prompt/input types, modality keys and
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metadata, queue and wire message schemas, serialization, output types,
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accumulation, completion semantics, and compatibility shims.
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It does not own route-specific validation or rendering, model-specific
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interpretation, connector transport mechanics, scheduling policy, or semantic
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error classification. The `ErrorMessage` schema belongs here; the meaning and
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public rendering of its error fields belong to `error_contracts.md`.
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## Candidate invariants
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These identifiers are proposals while the document is `draft`.
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### IO-INV-001: Boundary data has an explicit modality
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**Rule:** Data crossing a module or stage boundary MUST identify its modality
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and use the corresponding validated contract.
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### IO-INV-100: Request identity is stable
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**Rule:** Request identity MUST be preserved across conversions, stages,
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streaming updates, cancellation, and errors.
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### IO-INV-101: Completion is explicit
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**Rule:** Producers MUST distinguish partial updates from the terminal update
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for every output modality.
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### IO-INV-300: Internal objects do not leak into public protocols
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**Rule:** Entrypoints MUST explicitly translate internal output objects into
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public response types.
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## Invariant namespace
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`IO-INV` reserves `001-099` for schema ownership and dependency direction,
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`100-199` for identity, modality, accumulation, ordering, and completion,
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`200-299` for serialization failure and payload cleanup, and `300-399` for
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upstream extension, deprecation, and compatibility. Numbers become
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append-only after normative promotion.
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## Safe-change guide
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Test construction, validation, serialization, round trips, streaming,
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accumulation, completion, optional fields, unknown fields, and compatibility
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at every affected producer-consumer boundary.
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## Promotion gate
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- Add explicit CODEOWNERS for the primary I/O paths or confirm that fallback
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ownership is intentional.
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- Document the compatibility window for deprecated `vllm_omni.engine`
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I/O-related imports.
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- Verify wire round trips and rejection of unknown or incompatible schema
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fields.
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- Define payload-versus-metadata rules and completion semantics for streaming
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and batched outputs.
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- Obtain approval from a technical owner and independent AR, diffusion,
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connector, entrypoint, and validation reviewers as applicable.
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