ggml-org/llama.cpp b12229

on GitHub

server : fix response_format json_schema when schema is not nested in the json_schema wrapper (#28697)

• server : accept top-level schema in response_format with type json_schema

The OpenAI-compatible chat completions endpoint only applied the schema
when it was nested inside response_format.json_schema.schema. When the
schema was provided directly as response_format.schema (as documented in
the server README, and used by some clients), it was silently ignored
and generation ran unconstrained.

Also mention json_schema in the error message for invalid response_format
types, document the OpenAI wrapper form in the README, and add a test
case for the top-level schema form.

Fixes #10732

• server : let the json_schema wrapper take precedence by presence

Pick the schema source based on whether response_format has a
json_schema key, instead of falling back when the parsed wrapper schema
is empty. An empty schema {} is valid (any JSON value), so the old check
let a top-level schema override an explicit {} in the wrapper. Use
json_value() for the top-level schema too, like the rest of the
function, and add tests for the precedence.

Co-authored-by: linsen 251731047+linsen458-spec@users.noreply.github.com