Add two contract tests on the public proxy path
createAnthropicProxyResponse: JSON and SSE. Anthropic requires a
thinking block's signature to be a non-empty opaque string, but ccs
currently fabricates the signature as an object via
generateThinkingSignature(), which breaks the stream against reasoning
backends.
Built [OnSteroids](https://onsteroids.ai)
Claude Code's status line and the session log showed 0 tokens for every
streaming response routed through the OpenAI-compatible proxy. The root
cause was that the upstream request did not include
`stream_options: { include_usage: true }`, so the provider (LiteLLM and
other OpenAI-compatible endpoints) never emitted the final SSE chunk
that carries `usage`. The proxy's stream parser was already wired to
forward that chunk into an Anthropic-shaped `message_delta` event but
had nothing to forward.
Set `stream_options.include_usage` whenever the incoming Anthropic
request is streamed. Non-streamed requests are unaffected.
Ref: https://platform.openai.com/docs/api-reference/chat-streaming
(search 'include_usage')
- reject pending tool_result layouts that cannot be translated without reordering user content
- keep interleaved GLMT tool_use blocks open until finalization instead of stopping early
- cover leading/interleaved tool_result regressions and interleaved streaming tool fragments
- enforce strict tool_result ordering and pairing against assistant tool_use ids
- reject tool_result image payloads that cannot map to OpenAI tool messages
- preserve raw tool schemas on the /v1/messages proxy path instead of silently tightening them
- forward Anthropic tool_choice semantics and cover adaptive routing plus upstream payload checks
Tam Nhu Tran