When converting a Chat Completions stream into Responses events, the first
tool_call delta chunk was copied wholesale into stream state (including
function.arguments), then the same chunk's arguments were accumulated again by
the shared `+=` block. For OpenAI this is harmless because its first tool_call
chunk carries empty arguments, but upstreams that pack id+name+arguments into a
single chunk (e.g. GLM/Zhipu) end up with doubled arguments such as
{"cmd":"ls"}{"cmd":"ls"}. Codex then fails to parse the tool call with
"trailing characters", breaking every tool invocation.
Reset the copied arguments so the shared accumulator counts them exactly once,
keeping the emitted delta and the final done/arguments consistent.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
When gpt-image upstream returns response.completed with no image but a text
refusal (content moderation, e.g. the model replies "this request was judged
unsafe to generate"), the soft-failure path treated it as a probabilistic
upstream failure and returned a retryable UpstreamFailoverError (502). Retrying
or switching accounts is futile for a content-policy block — it just burns
other accounts' quota and still surfaces an opaque 502 to the client.
Distinguish the two no-image cases:
(A) model text refusal -> 400 content_policy_violation, no retry, refusal
reason passed through to the client.
(B) truly empty response -> unchanged: retryable UpstreamFailoverError (502).
Adds extractOpenAIImagesModelRefusal (extracts the refusal text from
output_text.delta / message output_text, capped at 600 chars) and two unit
tests; the existing empty-response retry test is unaffected.
Locks in that Claude Code detection keys on the billing block prefix +
cc_entrypoint=cli, not on the cch field that the new CLI (and now our own
mimicry) no longer sends:
- BillingBlockRecognizedWithoutCCH: an identity-prose-less sub-request whose
system block is `x-anthropic-billing-header: cc_version=...; cc_entrypoint=cli;`
(no cch) is still detected as Claude Code.
- NoCCHBlockStillRequiresClaudeCodeUA: dropping cch did not loosen detection —
a non-claude-cli UA is still rejected, so ClaudeCodeOnly groups can't be spoofed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Recent Claude Code CLI versions no longer emit the cch=... signature field in
their x-anthropic-billing-header system block (issue #3358). sub2api still
injected cch=00000 when mimicking Claude Code for OAuth accounts and optionally
signed it, so mimicked requests now diverge from real CLI traffic — the opposite
of what the mimicry is for.
- buildBillingAttributionText emits the block without the cch=00000 segment;
cc_version + cc_entrypoint=cli are kept (detection and Anthropic's first-party
signal rely on the block, not on cch).
- Retire signing: remove the two enableCCH signBillingHeaderCCH call sites in
buildUpstreamRequest / buildCountTokensRequest and delete the now-dead
signBillingHeaderCCH, cchPlaceholderRe, cchSeed, xxHash64Seeded helpers.
- enable_cch_signing is now a documented no-op (kept for backward compat).
- Drop the obsolete signing tests (TestSignBillingHeaderCCH, TestXXHash64Seeded,
TestSanitizeMustBeBeforeCCHSigning_HashConsistency) and update the prompt test
to assert the injected block no longer carries cch=.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
lyen1688