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Nick Hollon
8c4bfa6d07
The args-mining of `subagent_type` and `description` coupled the
streaming layer to one specific tool's args schema (the deepagents
`task` tool). Drop it: cause now carries only `{type: "tool_call",
tool_call_id}`. Args still live on the AIMessage's `tool_calls[i].args`
where they originate — consumers that want descriptive intent look
them up there via the `tool_call_id` join, keeping one source of truth.
Also promote `trigger_call_id` from `NotRequired` to required and
emit it on every event (started + every terminal path). Consumers
no longer need a namespace fallback to correlate `started` ↔ terminal
events for the same subgraph instance.
Renames:
- `_extract_per_call_args` -> `_extract_dispatching_tool_call_id`
(now returns just `str | None`)
- `_record_invocation_metadata` -> `_record_dispatching_tool_call_id`
- `_invocation_metadata` cache -> `_dispatching_tool_call_id`
- `_on_started` parameter `invocation_metadata` -> `tool_call_id`
- `_on_terminal` gains a `trigger_call_id` parameter; `_pop_terminal_transitions`
yields it through the tuple
Tests refreshed: cause-shape assertions reflect the slimmed payload,
new `test_trigger_call_id_present_on_every_terminal_path` covers all
five terminal exit paths, list-shape robustness test re-aimed at
missing `id` instead of missing args.