Alec Barber c1f1467f30 Handle undefined values before JSON serialization in code mode (#43873) ...

## Why

Passing `undefined` to a tool could fail JSON parsing because V8 stringifies it as the non-JSON text `undefined`.

## What changed

Return no JSON value for JavaScript `undefined`, so explicit `undefined` tool arguments behave like omitted arguments. Attempts to `store` an undefined value report the existing serializability error and preserve the previous stored value.

## Testing

Add regression coverage for storing `undefined` over an existing `null` value, and extend the current-time tool test to cover `{}`, omitted arguments, and explicit `undefined`.

GitOrigin-RevId: 071050ebb2ecc44c8f08453cf8523b4d21728c7e

2026-09-08 17:51:40 +00:00

..

src

Handle undefined values before JSON serialization in code mode (#43873)

2026-09-08 17:51:40 +00:00

tests

Report code mode host request durations (#41452)

2026-08-29 02:52:58 +00:00

BUILD.bazel

…

Cargo.toml

Improve tracing for nested tool calls and exec processes (#41950)

2026-09-01 01:00:50 +00:00