feat(tavily_weather): add example workflow for Tavily plugin

examples/tavily_weather/README.md

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+<!--
+SPDX-FileCopyrightText: Copyright (c) 2025-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+SPDX-License-Identifier: Apache-2.0
+-->
+
+# Tavily Weather (LangChain ReAct + Anthropic)
+
+Smoke-test workflow for the `nemo-agent-toolkit-tavily` package. A LangChain ReAct agent runs against Claude Sonnet 4.6 (via LiteLLM) with the Tavily tools (`search`, `extract`).
+
+## Run
+
+```bash
+export TAVILY_API_KEY=...
+export ANTHROPIC_API_KEY=...
+
+uv run nat run \
+  --config_file src/nat_tavily_weather/configs/config.yml \
+  --input "What is the weather in San Francisco right now?"
+```
+
+## What to expect
+
+The agent should make a single `tavily__search` tool call with a query like `"current weather San Francisco"`, receive structured search results, and produce a natural-language answer with the temperature/conditions.

examples/tavily_weather/pyproject.toml

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+# SPDX-FileCopyrightText: Copyright (c) 2025-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+[build-system]
+build-backend = "setuptools.build_meta"
+requires = ["setuptools>=64", "setuptools-scm>=8", "setuptools_dynamic_dependencies>=1.0.0"]
+
+[tool.setuptools_scm]
+git_describe_command = "git describe --long --first-parent"
+root = "../.."
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[project]
+name = "nat_tavily_weather"
+dynamic = ["version"]
+requires-python = ">=3.11,<3.14"
+description = "Tavily + LangChain ReAct + Anthropic example workflow"
+keywords = ["ai", "agents", "tavily", "anthropic"]
+classifiers = ["Programming Language :: Python"]
+
+dependencies = [
+  "nvidia-nat[langchain]",
+  "nemo-agent-toolkit-tavily",
+]
+
+[tool.uv.sources]
+[tool.uv.sources]
+nvidia-nat = { path = "../..", editable = true }

examples/tavily_weather/src/nat_tavily_weather/__init__.py

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+# SPDX-FileCopyrightText: Copyright (c) 2025-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0

examples/tavily_weather/src/nat_tavily_weather/configs/config.yml

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+# SPDX-FileCopyrightText: Copyright (c) 2025-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+function_groups:
+  tavily:
+    _type: tavily
+    exclude: [crawl, map]
+
+llms:
+  anthropic_llm:
+    _type: litellm
+    # Routed via litellm; uses ANTHROPIC_API_KEY from env.
+    model_name: anthropic/claude-sonnet-4-6
+
+workflow:
+  _type: react_agent
+  llm_name: anthropic_llm
+  tool_names:
+    # Group reference auto-expands to selected tools
+    - tavily
+  verbose: true
+  parse_agent_response_max_retries: 3