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fix(api): apply request top_p and penalties on streamed route - #615

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fix(api): apply request top_p and penalties on streamed route#615
cursor[bot] wants to merge 17 commits into
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cursor/bc-9110665e-f2c7-41ef-8ed3-2c2b5ad05f7b-5590

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Summary

Successor to #601 at 7e9a339. Keeps that head's fail-closed seed/stop/n/logprobs hoist, streamed request temperature, and omit-real tool.function nulls.

#601 closed the temperature drop on stream_chat. Live HTTP on that head: a streamed route body with top_p=0.1, presence_penalty=0.5, and frequency_penalty=-0.25 still billed SSE while stream_chat recorded only temperature. chat() already copies those request-scoped defaults into the provider payload; the stream path did not.

  • ModelClient.stream_chat copies default_top_p, default_presence_penalty, and default_frequency_penalty the same way chat() does, and records last_* for honesty probes.
  • HTTP cases in tests/test_stream_chat_request_nucleus_penalties_http_honesty.py (RED on fix(api): fail-closed seed/stop/n/logprobs on tools passthrough #601: last_top_p stayed unset).
  • Docs: README, docs/rest_api_design.md, docs/architecture.md, CHANGELOG. Grounding: Holtzman et al. (2020) nucleus sampling (OA PDF under docs/papers/nucleus-sampling-1904.09751.pdf) and OpenAI (2024).

Buyer next action: send the top_p and penalty values you want on streamed route bodies; they are applied, not dropped. Still omit seed, stop, n>1, and logprobs on tool-calling requests.

Prefer this head over merging #601 alone for the stream-sampling residual. Do not merge #589, #592, #594, #595, #596, #597, #599, #600, or #603-as-stack in parallel. KV allowlist landing remains #611 — do not open another allowlist PR. Independent non-author APPROVE + Full unit/Semgrep still required.

Test plan

  • python3 tests/test_stream_chat_request_nucleus_penalties_http_honesty.py (watched RED, then GREEN)
  • python3 tests/test_stream_chat_request_sampling_http_honesty.py
  • python3 tests/test_passthrough_request_knobs_http_honesty.py
  • python3 tests/test_true_streaming.py
  • python3 tests/test_paper_contracts.py test_self_check.py test_conventions.py test_api_contract.py
  • CI Full unit + Semgrep

Docs

  • docs/rest_api_design.md honesty contract now includes streamed top_p / penalties.
  • README architecture bullet tells buyers those knobs are applied on stream=true route bodies.
  • docs/papers/README.md cites Holtzman et al. (2020) APA 7th with the OA PDF.

References

Open in Web View Automation 

seonghobae and others added 17 commits August 16, 2026 21:18
…closed otherwise

Chat history: message-level audio and legacy function_call are null/empty omit
no-ops; non-empty fail closed with named errors (including tools passthrough).
Tip substrate from #577 assistant refusal/annotations honesty. Local full unit:
940 passed.
…ed otherwise

OpenAI fine-tune style message weight is not applied on this gateway.
Accept null/0/1 as honest no-ops; reject other types and values with
invalid_message_weight. Tip substrate from #578. Local full unit: 943 passed.
…ion role

Reject unsupported message keys with named unknown_message_fields (not silent
strip or tools-passthrough smuggle). Reject legacy function role with
invalid_message_role migration to tool. Tip substrate from #579. Local full
unit: 947 passed.
OpenAI partial-assistant prefix flag is not applied on this gateway.
null/false are honest no-ops; true and non-booleans fail closed with
invalid_message_prefix. Tip substrate from #580. Local full unit: 950 passed.
…therwise

Named invalid_max_tool_calls on /v1/chat/completions instead of opaque
unknown_fields. Aligns with Responses max_tool_calls honesty; gateway has
no multi-step tool loop.
…losed otherwise

Legacy /v1/completions treated max_tool_calls as unknown_fields. Accept the
key for named invalid_max_tool_calls (null/empty/whitespace omit-equivalent),
matching chat/Responses honesty so SDKs get a clear migration path.
SDK clients often send include_usage/include_obfuscation as JSON null.
Drop null flag values before validation so null (and null+false mixes)
match omit / all-false no-ops on chat, Completions, and Responses.
True flags remain fail-closed with invalid_stream_options.
…age honesty

Null include_usage/include_obfuscation stay omit-equivalent, but unknown
stream_options keys no longer become no-ops just because their value is
null. Weight, prefix, refusal, annotations, developer role, empty
user/system content, and participant name now use the same named errors
on the tools passthrough path as on orchestration.

Co-authored-by: Seongho Bae <seonghobae@users.noreply.github.com>
Hoist stream, required model, stream_options, and temperature/top_p range
checks before proxy_completion so a tools or response_format body cannot
return a billed JSON completion when the SDK asked for SSE, or silently
pick a pool model when model is omitted.

Co-authored-by: Seongho Bae <seonghobae@users.noreply.github.com>
Call the orchestration message, max_tokens, attribution, and routing
validators before proxy_completion so a tools or response_format body
cannot bill a completion with no prompt, crash on a non-object entry,
or silently drop unknown spend/routing keys.

Co-authored-by: Seongho Bae <seonghobae@users.noreply.github.com>
Passthrough has no batch job plane. Reject routing.channel=batch and
latency_tolerant=true before proxy_completion so a tool-calling body
cannot bill a silent sync completion.

Co-authored-by: Seongho Bae <seonghobae@users.noreply.github.com>
Co-authored-by: Seongho Bae <seonghobae@users.noreply.github.com>
Hoist the orchestration request-knob validators before proxy_completion
so a tools or response_format body cannot bill a completion that silently
drops seed, stop, n>1, logprobs, logit_bias, or out-of-range penalties.

Co-authored-by: Seongho Bae <seonghobae@users.noreply.github.com>
stream_chat defaulted to 0.2 even after the HTTP path wrote
default_temperature from the request. A streamed invoice summary at
temperature=0.8 no longer silently falls back to 0.2.

Co-authored-by: Seongho Bae <seonghobae@users.noreply.github.com>
… proxy

SDK optional defaults serialize omitted fields as JSON null. Accepting those
keys without popping them is not omit-equivalent: proxy_completion forwards
the body and several providers reject a null JSON Schema object.

Pop the keys in place, keep non-null wrong types on invalid_tools, and assert
omit-real via mock echo on chat and Responses.

Co-authored-by: Seongho Bae <seonghobae@users.noreply.github.com>
Co-authored-by: Seongho Bae <seonghobae@users.noreply.github.com>
stream_chat honored default_temperature after 18e6263 but still dropped
default_top_p, presence_penalty, and frequency_penalty. A streamed invoice
summary at top_p=0.1 billed a completion that ignored nucleus sampling.

Co-authored-by: Seongho Bae <seonghobae@users.noreply.github.com>
@cursor
cursor Bot requested a review from seonghobae August 16, 2026 15:56
@seonghobae
seonghobae marked this pull request as ready for review August 16, 2026 15:59
@seonghobae
seonghobae enabled auto-merge (squash) August 16, 2026 15:59
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Assessment (unique 7e9a339..18537ef)

Unique work matches the claimed buyer contract. A streamed mode=route invoice body with top_p=0.1, presence_penalty=0.5, and frequency_penalty=-0.25 now copies those request-scoped defaults in stream_chat the same way chat() does, and records last_* for honesty probes. Local tests/test_stream_chat_request_nucleus_penalties_http_honesty.py and the temperature sister script printed ok.

No critical, high, or medium defects on the unique slice. Holtzman et al. (2020) is cited APA 7th with the OA PDF. No new request-time env reads.

Buyer next action: send the top_p and penalty values you want on streamed route bodies; they are applied, not dropped. Still omit seed, stop, n>1, and logprobs on tool-calling requests.

Landing: prefer this head over merging #601 alone for the stream-sampling residual. Do not merge #589, #592, #594#597, #599, #600, or #603-as-stack in parallel. KV allowlist landing remains #611. SSE tools landing remains #620. Mode/trace hoist remains #613/#624. Do not open another stream-nucleus PR.

Merge gate still open: independent non-author APPROVE plus Full unit / Semgrep / Security job results. This review is COMMENT only.

Residual (not blocking): the provider-payload assignments sit behind # pragma: no cover because both new tests use mock:// and assert last_*. Same pattern as chat() and the #601 temperature probe.

Open in Web View Automation 

Sent by Cursor Automation: Fix Issues

"stream": True,
"max_tokens": self.max_output_tokens,
}
if effective_top_p is not None: # pragma: no cover

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Residual, not blocking: these three assignments are the actual provider-payload contract, but they sit behind # pragma: no cover because both new tests take the mock:// early return and assert last_* only. A later mutation can keep last_top_p and drop payload["top_p"] and still pass. Optional follow-up on a later head: stub _stream_send (or a non-mock agent) and assert the JSON body contains top_p / the two penalties. Do not open another stream-nucleus PR just for this.

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Pull request overview

OpenCode cannot approve yet because required coverage evidence did not pass.

Review outcome

1. HIGH .github/workflows/opencode-review.yml:1 - Coverage evidence did not prove required test/docstring evidence

  • Problem: The required coverage-evidence job result was failure, so OpenCode cannot establish approval sufficiency for this head.

  • Root cause: Automated approval is only valid when the same-head coverage-evidence job proves supported repository test suites passed and configured docstring gates passed or were advisory, or reports not applicable because no supported source files or package manifests exist. Missing, failed, skipped, unavailable, or unsupported-tooling test evidence is a blocker.

  • Fix: Install or configure the repository test/docstring evidence tooling when source files or package manifests exist, rerun the current-head coverage-evidence job, and approve only after it reports success with required evidence or explicit no-source not-applicable evidence.

  • Regression test: Keep the approval branch checking needs.coverage-evidence.result == success before posting APPROVE, and publish REQUEST_CHANGES when coverage-evidence blocker states such as cancelled, skipped, failed, unsupported-tooling, or below-100 evidence are present.

  • Result: REQUEST_CHANGES

  • Reason: coverage-evidence result was failure, so required test/docstring evidence was not proven for current head 18537efb323fcac15c0be2dbc1904544f425be93.

  • Head SHA: 18537efb323fcac15c0be2dbc1904544f425be93

  • Workflow run: 32138285985

  • Workflow attempt: 1

Coverage evidence

Coverage evidence job did not run or did not publish coverage evidence.

Changed-File Evidence Map

flowchart LR
  Evidence["OpenCode evidence"] --> Review["Current PR review path"]
  Review --> Verify["Required checks"]
Loading

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opencode-agent Bot commented Aug 18, 2026

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OpenCode Review Overview

  • Head SHA: 18537efb323fcac15c0be2dbc1904544f425be93
  • Workflow run: 32148145015
  • Workflow attempt: 1
  • Gate result: REQUEST_CHANGES (approval step)

Pull request overview

OpenCode cannot approve yet because required coverage evidence did not pass.

Review outcome

1. HIGH .github/workflows/opencode-review.yml:1 - Coverage evidence did not prove required test/docstring evidence

  • Problem: The required coverage-evidence job result was failure, so OpenCode cannot establish approval sufficiency for this head.

  • Root cause: Automated approval is only valid when the same-head coverage-evidence job proves supported repository test suites passed and configured docstring gates passed or were advisory, or reports not applicable because no supported source files or package manifests exist. Missing, failed, skipped, unavailable, or unsupported-tooling test evidence is a blocker.

  • Fix: Install or configure the repository test/docstring evidence tooling when source files or package manifests exist, rerun the current-head coverage-evidence job, and approve only after it reports success with required evidence or explicit no-source not-applicable evidence.

  • Regression test: Keep the approval branch checking needs.coverage-evidence.result == success before posting APPROVE, and publish REQUEST_CHANGES when coverage-evidence blocker states such as cancelled, skipped, failed, unsupported-tooling, or below-100 evidence are present.

  • Result: REQUEST_CHANGES

  • Reason: coverage-evidence result was failure, so required test/docstring evidence was not proven for current head 18537efb323fcac15c0be2dbc1904544f425be93.

  • Head SHA: 18537efb323fcac15c0be2dbc1904544f425be93

  • Workflow run: 32148145015

  • Workflow attempt: 1

Coverage evidence

Coverage evidence job did not run or did not publish coverage evidence.

Changed-File Evidence Map

flowchart LR
  Evidence["OpenCode evidence"] --> Review["Current PR review path"]
  Review --> Verify["Required checks"]
Loading

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Pull request overview

OpenCode cannot approve yet because required coverage evidence did not pass.

Review outcome

1. HIGH .github/workflows/opencode-review.yml:1 - Coverage evidence did not prove required test/docstring evidence

  • Problem: The required coverage-evidence job result was failure, so OpenCode cannot establish approval sufficiency for this head.

  • Root cause: Automated approval is only valid when the same-head coverage-evidence job proves supported repository test suites passed and configured docstring gates passed or were advisory, or reports not applicable because no supported source files or package manifests exist. Missing, failed, skipped, unavailable, or unsupported-tooling test evidence is a blocker.

  • Fix: Install or configure the repository test/docstring evidence tooling when source files or package manifests exist, rerun the current-head coverage-evidence job, and approve only after it reports success with required evidence or explicit no-source not-applicable evidence.

  • Regression test: Keep the approval branch checking needs.coverage-evidence.result == success before posting APPROVE, and publish REQUEST_CHANGES when coverage-evidence blocker states such as cancelled, skipped, failed, unsupported-tooling, or below-100 evidence are present.

  • Result: REQUEST_CHANGES

  • Reason: coverage-evidence result was failure, so required test/docstring evidence was not proven for current head 18537efb323fcac15c0be2dbc1904544f425be93.

  • Head SHA: 18537efb323fcac15c0be2dbc1904544f425be93

  • Workflow run: 32148145015

  • Workflow attempt: 1

Coverage evidence

Coverage evidence job did not run or did not publish coverage evidence.

Changed-File Evidence Map

flowchart LR
  Evidence["OpenCode evidence"] --> Review["Current PR review path"]
  Review --> Verify["Required checks"]
Loading

@seonghobae seonghobae closed this Aug 20, 2026
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