## Why
Schema strings and sequences do not grow after construction, and most schema nodes do not contain maps. Retaining collection capacity and inline optional maps adds unnecessary memory overhead.
## What changed
Store `JsonSchema` strings and sequences as boxed strings and slices, and box optional property and definition maps. Adapt constructors, schema consumers, and existing test expectations to the new representation while preserving the serialized JSON Schema format.
GitOrigin-RevId: 0a249b1ae32932cbbfe3c575c32bfd20b060c303
## Why
Fixed schema budgets can strip parameter descriptions from large MCP tools or render their Code Mode input types as `unknown`. Allow larger budgets to preserve that guidance.
## What changed
- Add `mcp_servers.<name>.tool_input_schema_max_bytes` to configure the UTF-8 byte threshold for best-effort input schema compaction, retaining the 5,000-byte default.
- Add `features.code_mode.tool_input_schema_max_bytes` for rendered input types. Use the largest of the 16,000-byte default, the Code Mode setting, and the ordinary MCP server's explicit setting.
- Apply rendering budgets to prompt declarations and the runtime tool catalog, and avoid reusing cached declarations after the Code Mode budget changes.
## Testing
Add coverage for UTF-8 compaction thresholds, budget precedence, configuration round trips, and preservation of parameter guidance in both the Code Mode prompt and `ALL_TOOLS`.
GitOrigin-RevId: 0ef2823a614d4794e636f518b09c0b03a5239b45
## What changed
- Replace `send_user_message_async` with `request_user_input_async`, accepting one or more questions with optional suggested answers while allowing the turn to continue.
- Attach structured question metadata to asynchronous agent messages while retaining readable fallback text, and preserve it through app-server events, thread history, and generated schemas.
- Continue enabling the new tool for model catalogs that advertise either the old or new tool name.
## Testing
- Cover tool registration, question validation, emitted items, continued turn execution, history preservation, and backwards-compatible deserialization.
GitOrigin-RevId: ffc49aebde2e854c3c50a122aa52805fec3fc6b3
## What changed
- Move schema types, traversal helpers, and large-schema compaction into
dedicated `json_schema` submodules.
- Keep the public schema types re-exported from the existing module and
colocate focused unit tests with their implementations.
GitOrigin-RevId: 953b96c28ae3880f601b588eb016fa126c438852
Charlie Marsh