v4.2.6 — PTC supports parallel execution (delegation tools fan out from program scripts)#86
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The program/PTC VM runs on a nested single-thread runtime, so parallel_task's
child agents couldn't actually run in parallel — delegation in a script was
broken (and was blocked in 4.2.3). Now execute_host_tool_json captures the
OUTER multi-threaded session runtime Handle and spawns the tool there, so
ctx.tool('parallel_task', …) fans out child agents in parallel. Re-allow
task/parallel_task in script_allowed_tools. Bumps to 4.2.6.
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Makes
ctx.tool('parallel_task', …)inside aprogram/PTC script actually fan out child agents in parallel — the missing piece for script-driven dynamic workflows.Root cause: the PTC VM runs on a nested
new_current_threadruntime (insidespawn_blocking), soparallel_task'stokio::spawned child agent loops ran cooperatively on that single thread — no real parallelism. 4.2.3 worked around it by strippingtask/parallel_taskfrom PTC scripts.Fix:
run_quickjs_scriptcaptures the OUTER multi-threaded session runtimeHandle::current();execute_host_tool_jsonnowouter.spawn(...)s the tool there, so a tool's child agents run on the multi-thread runtime and fan out. Re-allowedtask/parallel_taskinscript_allowed_tools.Test:
program_tool_allows_delegation_tools_in_scripts; builds clean (Send-safe). Bumps to 4.2.6 (versions aligned). Unblocks the CLI's script-driven ultracode workflows.