Before: main a12d6ed942; Ubuntu Linux, real web dev server + Codex GPT-6-Astra.

Steps: request assistant sentence; select sentence; Cite selection in composer; ask to echo complete user input.

USER:

[Assistant quote](t3-citation://v1/1a938ece-0620-4af8-9496-c4c798b69ffd/thread%3Aproject%3A1e5310a7-33a4-430e-a512-cef52ca90691%3A0973da00-8949-4e5f-ac6f-e561d916e4c5/message%3Aprovider%3Acodex%3Anative-item%3Amsg_0fddb832483cbbdf016ad9447348e0819585a858a0534d43f5?text=The+amber+kite+flies+above+the+lake.&start=0&end=36&prefix=&suffix=)  Echo the complete text of this user message verbatim, including any raw citation URL or citation block. Do not use tools.

ASSISTANT:

[Assistant quote](t3-citation://v1/1a938ece-0620-4af8-9496-c4c798b69ffd/thread%3Aproject%3A1e5310a7-33a4-430e-a512-cef52ca90691%3A0973da00-8949-4e5f-ac6f-e561d916e4c5/message%3Aprovider%3Acodex%3Anative-item%3Amsg_0fddb832483cbbdf016ad9447348e0819585a858a0534d43f5?text=The+amber+kite+flies+above+the+lake.&start=0&end=36&prefix=&suffix=)  Echo the complete text of this user message verbatim, including any raw citation URL or citation block. Do not use tools.

Variant: citation with Unicode comment; provider user input:
[Assistant quote](t3-citation://v1/1a938ece-0620-4af8-9496-c4c798b69ffd/thread%3Aproject%3A1e5310a7-33a4-430e-a512-cef52ca90691%3A0973da00-8949-4e5f-ac6f-e561d916e4c5/message%3Aprovider%3Acodex%3Anative-item%3Amsg_0fddb832483cbbdf016ad9447348e0819585a858a0534d43f5?text=The+amber+kite+flies+above+the+lake.&start=0&end=36&prefix=&suffix=&comment=Explain+caf%C3%A9%2C+%E6%97%A5%E6%9C%AC%E8%AA%9E%2C+and+this+quote.) Echo the complete text of this user message verbatim in a fenced code block, including the citation URL or block. Do not use tools.