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Create a chat session, optionally with its first turn

POST 
/api/v2/chat-sessions/

Creating with first_turn persists a user message and queues generation. An empty session returns 201; a session with its first turn returns 202. Responses carry ETag and Content-Language but no Location or Link header. Use active_turn_id to construct the SSE URL. Matching idempotency replay returns the current session. For document sessions, resume with the document_context and optional session_id; the server verifies access to the resolved owner and full file path for the authenticated user. Client-supplied owner and path are not authorization proof.

Request​

Responses​

Empty session created

Response Headers
    X-Contract-Version

    Version of the gaius-api-contracts release the backend runs (legalgpt-contracts), sent on every response. Clients compare it with the @legalgpt/contracts version they were built with; both packages share one version per contract.

    Cache-Control

    Prevents storage of sensitive authenticated chat data.

    ETag

    Strong session revision tag. Polish has no suffix; other supported languages append the language code. Use the same Accept-Language on reads and conditional mutations.

    Content-Language

    Language selected for outgoing generic tool-status labels and known HTTP/timeline error text. HTTP reason-phrase titles remain language-neutral.