fix(generate): preserve image usage and complete execution evidence

[huronat]

Successful image-bearing generation responses omitted the worker-observed image count. Carry optional usage.images from successful execution through queue collection, native and compatibility responses, and Python/TypeScript SDKs. Text-only and failed/cancelled execution do not invent image observations.

Buffered execution evidence now requires a complete, consistent identity/binding pair across accepted chunks, matching the streaming collector. A valid terminal cannot repair missing, malformed, or changed earlier evidence.

Validation:

• 370 Python generation worker, direct HTTP, and sync/async SDK tests passed.
• 30 stream collector tests, 58 SSE tests, and the JSON/MessagePack buffered evidence regression passed.
• 54 TypeScript parser tests, SDK build/typecheck/lint, gateway clippy, scoped Python typecheck and Ruff passed.
• Gateway OpenAPI regenerated.
• Adversarial review found no remaining issues after enforcing atomic collected evidence. Tests use synthetic requests; live model acceptance is still required.

Sibling sweep: checked both native worker execution paths, all queue terminal usage builders, native and OpenAI buffered/SSE projections, both Python buffered parsers, and TypeScript buffered parsing. The Responses API remains text-only. Existing missing/malformed digest validation is preserved; collected digest fields are omitted together when incomplete.

Summary by CodeRabbit

• New Features

  • Usage data can optionally report the number of input images processed.
  • Image counts are available in streaming and non-streaming generation responses.
  • Supported SDKs expose image counts in generation and chat usage results.

• Bug Fixes

  • Usage metadata remains complete across response formats.
  • Image counts appear only for successful generations with at least one processed image.
  • Invalid image-count values are safely omitted.

• Tests

  • Added coverage for valid, invalid, cancelled, and failed generation scenarios.

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📒 Files selected for processing (3)

• packages/sie_server/openapi.json
• packages/sie_server/src/sie_server/types/openapi.py
• packages/sie_server/tests/processors/test_streaming.py

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📝 Walkthrough

Walkthrough

The change adds optional image usage metrics to generation responses. Server paths populate the metric for successful image generation, gateways preserve it across response formats, and Python and TypeScript SDKs validate and expose it.

Changes

Image Usage Reporting

Layer / File(s)	Summary
Server usage production and terminal validation packages/sie_server/src/sie_server/api/generate.py, packages/sie_server/src/sie_server/processors/streaming.py, packages/sie_server/tests/api/*, packages/sie_server/tests/processors/*	Generation paths include usage.images for successful requests with images. Error, cancelled, zero-image, and non-terminal cases omit the field.
Gateway usage and execution metadata packages/sie_gateway/openapi.json, packages/sie_gateway/src/openapi.rs, packages/sie_gateway/src/queue/streaming.rs, packages/sie_gateway/src/handlers/proxy.rs, packages/sie_gateway/src/handlers/sse.rs	Gateway schemas and UsageBlock expose optional image counts. JSON, MessagePack, and SSE responses preserve complete usage objects. Buffered-generation headers use the buffered helper, and execution metadata requires consistent valid proofs.
Python SDK parsing and types packages/sie_sdk/src/sie_sdk/types.py, packages/sie_sdk/src/sie_sdk/client/sync.py, packages/sie_sdk/src/sie_sdk/client/async_.py, packages/sie_sdk/tests/client/test_generate.py	Python usage types and result parsers preserve positive non-boolean image counts within the 32-bit unsigned range. Tests cover invalid values and buffered-generation metadata.
TypeScript SDK parsing and types packages/sie_ts_sdk/src/types.ts, packages/sie_ts_sdk/src/internal/parsing.ts, packages/sie_ts_sdk/tests/internal.test.ts	TypeScript usage types and result parsing preserve positive safe image counts within the 32-bit unsigned range. Tests cover missing, invalid, and unsafe values.

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant sie_server
  participant sie_gateway
  participant SDK
  Client->>sie_server: Submit generation request with images
  sie_server->>sie_server: Count images and encode terminal usage
  sie_server->>sie_gateway: Return usage with images when generation succeeds
  sie_gateway->>Client: Serialize complete usage block
  Client->>SDK: Parse generation result
  SDK->>Client: Expose validated usage.images

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Suggested reviewers: krisztian-gajdar

Priority: ➖ Normal

Merge Risk: ⚪ Minimal · up to c8a20

The previously suspected fallback inconsistency is not present in the current behavior. No actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 48.65% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 37 functions across 16 files. (1 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main changes: preserving image usage and complete execution evidence during generation.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 48.65% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 37 functions across 16 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

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Inline comments:
In `@packages/sie_server/src/sie_server/processors/streaming.py`:
- Line 2389: Update the StopAsyncIteration fallback success path after
_flush_pending() so it passes the accumulated image_count when emitting the
successful stop terminal. Ensure _encode_chunk produces usage.images for
image-only success responses even when token counts are absent, while preserving
existing behavior for token-based usage.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: 6a669e1b-6009-4351-8aff-d34c2567d870

📥 Commits

Reviewing files that changed from the base of the PR and between b0f0eeb and c9e9b7e.

📒 Files selected for processing (17)

• packages/sie_gateway/openapi.json
• packages/sie_gateway/src/handlers/proxy.rs
• packages/sie_gateway/src/handlers/sse.rs
• packages/sie_gateway/src/openapi.rs
• packages/sie_gateway/src/queue/streaming.rs
• packages/sie_sdk/src/sie_sdk/client/async_.py
• packages/sie_sdk/src/sie_sdk/client/sync.py
• packages/sie_sdk/src/sie_sdk/types.py
• packages/sie_sdk/tests/client/test_generate.py
• packages/sie_server/src/sie_server/api/generate.py
• packages/sie_server/src/sie_server/processors/streaming.py
• packages/sie_server/tests/api/test_generate.py
• packages/sie_server/tests/api/test_generate_stream.py
• packages/sie_server/tests/processors/test_streaming.py
• packages/sie_ts_sdk/src/internal/parsing.ts
• packages/sie_ts_sdk/src/types.ts
• packages/sie_ts_sdk/tests/internal.test.ts

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