Update include_plugins per Issue #1173 - 9

[zyantw]

Rendered page> https://deploy-preview-1990--adk-docs-preview.netlify.app/tools-custom/function-tools/#control-plugin-inheritance
PRs> #1190 #1192
Original Issue> #1173
Originating code commit: google/adk-python@777dba3

The code snippet broke the first time so I worked on several commits to fix it. The rendering looks good now!

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• Changed the proposed note format into a bullet point, then into a subsection to not break the snippets.
• Made the explanation shorter and more direct so it matches Google's writing style guide.
• Fixed and replaced the undefined agent variable with a concrete MyImageAgent placeholder class to make the Python snippet self-contained.
• Added comments inside the code to explain exactly what happens when you turn plugins on or off (like how it affects things like tracing and events).
• Did light formatting in the rest of the page

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[joefernandez]

Technical Review Verification & Code Citations:

• In agent_tool.py:L137-L151 (GitHub Link), the AgentTool class constructor accepts include_plugins as a keyword-only argument, defaulting to True.

Test Coverage:

The behavioral expectations described in the PR are thoroughly tested and validated by several unit tests:

• test_include_plugins_default_true (GitHub Link): Verifies that when include_plugins is omitted, plugins from the parent runner are propagated to the child agent by default.

• test_include_plugins_explicit_true (GitHub Link): Verifies that when include_plugins=True is explicitly passed, plugins are propagated.

• test_include_plugins_false (GitHub Link): Verifies that when include_plugins=False is passed, the child agent runs in an isolated environment and does not receive parent plugins.

• test_include_plugins_true_sub_runner_does_not_close_parent_plugins (GitHub Link): Verifies that parent-owned plugins are not closed/torn down when the child runner finishes execution.

[joefernandez]

Approved with comments.