fix: add stream toggle back to agent

[Cristhianzl]

Objective

Restore the Stream toggle on the Agent component, which was inadvertently dropped when the ModelInput selector was unified (#12025).

Summary by CodeRabbit

Release Notes

• New Features

  • Added "Stream" setting to the Agent component, allowing users to configure whether the selected language model uses streaming.

• Tests

  • Added unit tests to verify the Stream input field functionality and language model configuration.

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Walkthrough

AgentComponent now exposes an advanced stream boolean input for controlling language model streaming behavior. The component imports the help text constant, adds the input field definition, and forwards the stream value to get_llm(). Regression tests validate that the input is correctly exposed and forwarded during agent requirements retrieval.

Changes

Agent component stream input

Layer / File(s)	Summary
Stream input definition and forwarding src/lfx/src/lfx/components/models_and_agents/agent.py	AgentComponent imports STREAM_INFO_TEXT, adds a new stream BoolInput field (advanced visibility, default false) to component inputs, and forwards the stream value to get_llm() in the _get_llm() method.
Stream input regression tests src/backend/tests/unit/components/models_and_agents/test_agent_component.py	Two regression tests verify that stream appears in component inputs, that the component exposes a stream attribute, and that stream=True is correctly forwarded to get_llm() during get_agent_requirements().

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 8 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Test Quality And Coverage	⚠️ Warning	Tests incomplete. Only tests stream=True case, missing stream=False test. Smoke test present but no default value verification. Similar max_tokens feature has two functional tests; stream has one.	Add test for stream=False/disabled state to match max_tokens test coverage pattern.

✅ Passed checks (8 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Test Coverage For New Implementations	✅ Passed	PR includes comprehensive test coverage with two regression unit tests validating the new stream functionality. Tests follow naming conventions and contain meaningful assertions with proper mocking.
Test File Naming And Structure	✅ Passed	Tests follow test_*.py naming, pytest fixtures, descriptive async functions, docstrings, proper mocking/assertions. Covers default and stream=True scenarios as required.
Excessive Mock Usage Warning	✅ Passed	Mock usage is appropriate and not excessive. First test uses no mocks (structural test). Second test uses 2 focused mocks targeting external dependencies, following established patterns in file.
Title check	✅ Passed	The title 'fix: add stream toggle back to agent' clearly and concisely summarizes the main change—restoring a previously removed stream toggle feature to the Agent component.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cz/fix-add-stream-agent

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[github-actions]

✅ Test Coverage Advisor

No source changes detected without accompanying tests. Thanks for keeping coverage up! 🎉

Advisory check only — never blocks merge.

[erichare]

LGTM

[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	38.59% (48192/124856)	67.94% (6576/9678)	38.48% (1109/2882)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
4317	0 💤	0 ❌	0 🔥	10m 32s ⏱️

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.85%. Comparing base (851a484) to head (37415bc).

❌ Your project check has failed because the head coverage (49.17%) is below the target coverage (60.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@                Coverage Diff                 @@
##           release-1.10.0   #13155      +/-   ##
==================================================
- Coverage           54.86%   54.85%   -0.01%     
==================================================
  Files                2150     2150              
  Lines              200679   200679              
  Branches            30262    28613    -1649     
==================================================
- Hits               110101   110081      -20     
- Misses              89389    89409      +20     
  Partials             1189     1189              

Flag	Coverage Δ
backend	60.33% <ø> (-0.05%)	⬇️
frontend	54.86% <ø> (-0.01%)	⬇️
lfx	49.17% <ø> (ø)

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see 38 files with indirect coverage changes

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