Spec AbortSignal integration with tool execution - #247
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Spec abortable tools Better note
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This PR specifies abortable tools, via
AbortSignalintegration withexecuteTool(). Specifically, we introduce a new "local" pending execution map that is only ever mutated on the tool owner/target document's event loop, so it can track pending executions from its side, separately from the "traversable"-global map that's mutated in parallel and matches a canonical "browser process". We introduce theToolExecuteCallbackOptionsdictionary and its solesignalmember, which is always passed into theToolExecuteCallbackas its second argument.This PR also handles various race conditions with tool execution, tool cancellation, and tool promise resolution/rejection, that can all happen across agent clusters. Each race condition is accounted for and documented, sometimes with examples.
Fixes #48.
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