roadmap: #218 filed — MessageRequest has no response_format / output_config / seed / logprobs / top_logprobs / logit_bias / n / metadata fields (types.rs:6-36, thirteen fields, zero hits across rust/ for any of these); build_chat_completion_request (openai_compat.rs:845) writes thirteen optional fields and emits none of these on the wire; AnthropicClient::send_raw_request (anthropic.rs:466) renders same MessageRequest via render_json_body (telemetry/lib.rs:107) with same gaps; ChatMessage (openai_compat.rs:688) has three fields (role, content, tool_calls) and no refusal field despite the streaming-aggregator test at line 1781 explicitly including "refusal": null in test data — silent serde drop; ChunkDelta (openai_compat.rs:735) has same gap; OutputContentBlock (types.rs:147) has four variants (Text, ToolUse, Thinking, RedactedThinking) and no Refusal variant; MessageResponse.stop_reason (types.rs:127) has no slot for Anthropic's 2025-11+ stop_reason='refusal' value; net effect: claw cannot opt into OpenAI strict-schema constrained decoding (response_format json_schema, GA 2024-08), cannot opt into Anthropic GA structured outputs (output_config.format, GA 2025-11-13), cannot opt into legacy JSON mode (response_format json_object), cannot supply seed for reproducible sampling, cannot request logprobs/top_logprobs, cannot bias tokens via logit_bias, cannot request multiple completions via n, and silently discards every refusal string OpenAI emits when constrained decoding rejects a generation — refusals classified as Finished/success with empty content via #217 normalize_finish_reason mapping (Jobdori cycle #370 / extends #168c emission-routing audit / sibling-shape cluster grows to seventeen: #201/#202/#203/#206/#207/#208/#209/#210/#211/#212/#213/#214/#215/#216/#217/#218 / wire-format-parity cluster grows to eight: #211+#212+#213+#214+#215+#216+#217+#218 / four-layer-structural-absence shape: request-struct-field + request-builder-write + response-struct-field + content-block-taxonomy-variant, largest single-feature absence catalogued / external validation: OpenAI Structured Outputs guide, OpenAI Chat Completions API reference, Anthropic structured-outputs reference (GA 2025-11-13), Anthropic Messages API reference (stop_reason='refusal'), Vercel AI Gateway Anthropic structured outputs, Vercel AI SDK 6 generateObject + Zod, LangChain with_structured_output, simonw/llm --schema flag, charmbracelet/crush, anomalyco/opencode#10456 open feature request citing OpenAI Codex as reference, anomalyco/opencode#5639/#11357/#13618, OpenAI Codex CI/code-review cookbook, OpenRouter structured-outputs docs, OpenAI Python SDK client.beta.chat.completions.parse, OpenTelemetry GenAI semconv gen_ai.request.response_format + gen_ai.response.refusal)

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