feat: add Tavily search provider option to Agentic-RAG-Pipeline

[tavily-integrations]

Summary

Adds Tavily as a configurable web search provider alongside the existing Google Custom Search Engine (CSE) in the Agentic-RAG-Pipeline sub-app. This is an additive change — Google CSE remains the default and is fully intact.

What changed

• Agentic-RAG-Pipeline/core/tools.py: Added TavilyWebSearch class using tavily-python SDK, exposing the same search(q, num) interface and {title, url, snippet} return format as the existing WebSearch class.
• Agentic-RAG-Pipeline/app.py: Extended provider selection logic to check SEARCH_PROVIDER env var. When set to "tavily" and TAVILY_API_KEY is present, uses TavilyWebSearch; otherwise falls through to Google CSE as before.
• Agentic-RAG-Pipeline/.env.example: Added SEARCH_PROVIDER and TAVILY_API_KEY entries alongside existing CSE vars.
• Agentic-RAG-Pipeline/requirements.txt: Added tavily-python>=0.3.0.

How to use

Set these environment variables to switch to Tavily:

SEARCH_PROVIDER=tavily
TAVILY_API_KEY=tvly-your-key

To keep using Google CSE (the default), no changes are needed.

Notes for reviewers

• Google CSE code paths, env vars (CSE_API_KEY, CSE_ENGINE_ID), and dependencies are untouched.
• TavilyWebSearch maps Tavily's content field to snippet for interface compatibility.

Automated Review

• Passed after 1 attempt(s)
• Final review: The migration is correct and complete. TavilyWebSearch properly mirrors the WebSearch interface, uses the right Tavily SDK call (TavilyClient.search(query=..., max_results=...)) with correct response field mapping (content → snippet), and the synchronous client is appropriate for this non-async app. app.py correctly implements the SEARCH_PROVIDER env-var gate while preserving the Google CSE fallback path. All four planned files are updated. Two minor issues: the tavily-python pin lacks an upper bound (inconsistent with all other deps), and there is no warning log when SEARCH_PROVIDER=tavily is set but TAVILY_API_KEY is absent (silent fallthrough to CSE/disabled).

[gemini-code-assist]

Code Review

This pull request introduces Tavily Search as an optional web search provider alongside Google CSE. The changes include a new TavilyWebSearch wrapper class in core/tools.py, updated environment variable examples, and logic in app.py to toggle between search providers. Feedback suggests improving error reporting when a specific search provider is requested but its API key is missing, and adding an upper version bound to the tavily-python dependency in requirements.txt to ensure consistency and long-term stability.

[gemini-code-assist]

When SEARCH_PROVIDER is explicitly set to 'tavily' but TAVILY_API_KEY is missing, the application currently falls back to Google CSE (if configured) or disables search entirely without a specific warning. It would be more helpful to the user to explicitly report that the requested provider is misconfigured.

Suggested change

	if search_provider == "tavily" and tavily_key:
	web = TavilyWebSearch(api_key=tavily_key)
	print("[web] Tavily Search enabled.")
	elif cse_key and cse_engine:
	web = WebSearch(api_key=cse_key, engine_id=cse_engine)
	print("[web] Google Programmable Search enabled.")
	else:
	print("[web] Web search disabled (set CSE_API_KEY & CSE_ENGINE_ID to enable).")
	print("[web] Web search disabled (set CSE_API_KEY & CSE_ENGINE_ID, or TAVILY_API_KEY to enable).")
	if search_provider == "tavily":
	if tavily_key:
	web = TavilyWebSearch(api_key=tavily_key)
	print("[web] Tavily Search enabled.")
	else:
	print("[web] Tavily Search requested but TAVILY_API_KEY is missing.")
	elif cse_key and cse_engine:
	web = WebSearch(api_key=cse_key, engine_id=cse_engine)
	print("[web] Google Programmable Search enabled.")
	else:
	print("[web] Web search disabled (set CSE_API_KEY & CSE_ENGINE_ID, or TAVILY_API_KEY to enable). ")

[gemini-code-assist]

The tavily-python dependency is missing an upper bound, which is inconsistent with the other dependencies in this file. Adding an upper bound (e.g., <1.0.0) helps ensure stability by preventing automatic upgrades to potentially breaking major versions.

tavily-python>=0.3.0,<1.0.0