interrupts - multiagent - do not emit AfterNodeCallEvent on interrupt

[pgrayy]

Description

For single-agents, if a tool is interrupted, we do not emit the AfterToolCallEvent (src). There are a few motivations for this behavior:

• AfterToolCallEvent expects a tool result which we won't have until after the tool finishes executing.
• By its name, AfterToolCallEvent should happen after the tool is called, which is not the case if we are in the middle of processing an interrupt.

For multi-agents, we always emit an AfterNodeCallEvent even if the node is interrupted. In this PR, we fix the behavior to match AfterToolCallEvent. We will not emit an AfterNodeCallEvent if the node is in the middle of an interrupt.

Related Issues

#1538

Documentation PR

N/A

Type of Change

Bug fix

Testing

How have you tested the change? Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli

• I ran hatch run prepare: Wrote new unit tests
• I ran hatch test tests_integ/interrupts/multiagent: Relying on existing integ tests

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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[pgrayy]

Note, unlike graph, swarm nodes do not have a status field. Consequently, we need to check the state status.

[zastrowm]

Out of curiosity, should it?

Would we do it differently for TypeScript?

[pgrayy]

Yes. I definitely think there should be more consistency between GraphNode and SwarmNode and that is something I am planning for in TypeScript. I have to dig a bit deeper but it could be that we are able to utilize one shared node class.

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/strands/multiagent/swarm.py	50.00%	0 Missing and 1 partial ⚠️

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