[#10889][fix] fix pydantic deepcopy bug

[reasonsolo]

This PR will fix #10889

Summary by CodeRabbit

• New Features

  • Added support for tool calls in disaggregated inference mode
  • Included example prompt demonstrating tool call behavior with function invocation

• Tests

  • Added integration test for disaggregated tool call functionality

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Description

Test Coverage

PR Checklist

Please review the following before submitting your PR:

• PR description clearly explains what and why. If using CodeRabbit's summary, please make sure it makes sense.

• PR Follows TRT-LLM CODING GUIDELINES to the best of your knowledge.

• Test cases are provided for new code paths (see test instructions)

• Any new dependencies have been scanned for license and vulnerabilities

• CODEOWNERS updated if ownership changes

• Documentation updated as needed

• Update tava architecture diagram if there is a significant design change in PR.

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• Please check this after reviewing the above items as appropriate for this PR.

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[coderabbitai]

📝 Walkthrough

Walkthrough

A new disaggregated test scenario for tool calls is introduced with supporting infrastructure: a JSON example file containing tool call prompts, updates to OpenAI client and service implementations for proper JSON serialization and request handling, and corresponding test definitions and configurations.

Changes

Cohort / File(s)	Summary
Tool Call Example Data examples/disaggregated/clients/tool_call_prompts.json	New JSON example file with a user prompt and assistant tool call response for weather function.
OpenAI Service Updates tensorrt_llm/serve/openai_client.py, tensorrt_llm/serve/openai_disagg_service.py	Client: Added explicit mode="json" parameter to model_dump() for JSON serialization. Service: Replaced deepcopy-based context request cloning with model_copy update that sets disaggregated_params and enforces streaming configuration in a single operation.
Test Infrastructure tests/integration/defs/disaggregated/test_disaggregated.py	Added new test function test_disaggregated_chat_completion_tool_calls with test configuration entry for "tool_calls" scenario; extended run_client_tests workflow to handle tool_calls by setting chat endpoint output and bypassing streaming/completion steps.
Test Registry tests/integration/test_lists/test-db/l0_a10.yml	Added new test entry for disaggregated tool calls test with TinyLlama model to l0_a10 test list.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~22 minutes

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Description check	⚠️ Warning	The PR description is incomplete, containing only the repository template with unfilled placeholders and no actual content in the Description or Test Coverage sections.	Fill in the Description section explaining the pydantic deepcopy bug being fixed and why. Complete the Test Coverage section listing relevant tests. Check off the PR Checklist items to confirm compliance.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: fixing a pydantic deepcopy bug related to issue #10889. It's specific, concise, and accurately reflects the primary fix in the changeset.

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✨ Finishing touches

• 📝 Generate docstrings

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[reasonsolo]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #33589 [ run ] triggered by Bot. Commit: be4b509

[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@tests/integration/defs/disaggregated/test_disaggregated.py`:
- Around line 796-817: The test function
test_disaggregated_chat_completion_tool_calls has an unused fixture argument
disaggregated_test_root causing a Ruff ARG001 lint error; rename the parameter
to _disaggregated_test_root (or prefix with an underscore) in the function
signature so the fixture is still injected but linting is satisfied, e.g.,
update the def line for test_disaggregated_chat_completion_tool_calls to use
_disaggregated_test_root and leave all other code (including src_dst_dict,
symlink setup, and run_disaggregated_test call) unchanged.

[tensorrt-cicd]

PR_Github #33589 [ run ] completed with state SUCCESS. Commit: be4b509
/LLM/main/L0_MergeRequest_PR pipeline #25910 completed with status: 'FAILURE'

⚠️ Action Required:

• Please check the failed tests and fix your PR
• If you cannot view the failures, ask the CI triggerer to share details
• Once fixed, request an NVIDIA team member to trigger CI again

[reasonsolo]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #33657 [ run ] triggered by Bot. Commit: be4b509

[tensorrt-cicd]

PR_Github #33657 [ run ] completed with state SUCCESS. Commit: be4b509
/LLM/main/L0_MergeRequest_PR pipeline #25966 completed with status: 'FAILURE'

⚠️ Action Required:

• Please check the failed tests and fix your PR
• If you cannot view the failures, ask the CI triggerer to share details
• Once fixed, request an NVIDIA team member to trigger CI again

[reasonsolo]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #33676 [ run ] triggered by Bot. Commit: be4b509

[tensorrt-cicd]

PR_Github #33676 [ run ] completed with state SUCCESS. Commit: be4b509
/LLM/main/L0_MergeRequest_PR pipeline #25980 completed with status: 'SUCCESS'