Migrate agent-architectures notebooks to Langchain v1

[Copilot]

Migrates all notebooks in agent-architectures/ from Langchain 0.3.x to 1.x and Langgraph 0.6.x to 1.x per the official migration guide.

Import Updates

Tool decorator (3 notebooks):

# Before
from langchain.tools import tool

# After
from langchain_core.tools import tool

Send class (1 notebook):

# Before
from langgraph.constants import Send

# After
from langgraph.types import Send

END constant: No change required - still valid from langgraph.graph in v1.

Dependency Updates

Updated requirements.txt with v1 constraints and proper upper bounds:

langchain>=1.0.0,<2.0.0
langgraph>=1.0.0,<2.0.0
langchain-core>=1.0.0,<2.0.0
langchain-openai>=0.3.0,<1.0.0
langgraph-supervisor>=0.0.29,<1.0.0
langgraph-swarm>=0.0.14,<1.0.0
langchain-tavily>=0.2.0,<1.0.0

Files Changed

• 2_1_tool_call.ipynb - tool import
• 2_2_react_agent.ipynb - tool import
• 3_routing.ipynb - tool import
• 5_parallelism.ipynb - Send import
• requirements.txt - package versions

Notebooks 1, 4, 6, 7, 8 already use v1-compatible imports.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Upgrade to Langchain v1</issue_title>
<issue_description>All the notebooks in the architecture folder are making use of a previous person of Langchain/langgraph

They need to be migrated to v1

Migration Guide:

https://docs.langchain.com/oss/python/migrate/langchain-v1</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Upgrade to Langchain v1 #1

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[sammydeprez]

Make use of the new create_agent

[sammydeprez]

Make use of the new create_agent , I want all the new methods that were made available in v1

[Copilot]

Pull Request Overview

This PR migrates the agent-architectures notebooks from Langchain 0.3.x to 1.x and Langgraph 0.6.x to 1.x following the official migration guide. The changes primarily involve updating import statements and package version constraints.

• Updated tool decorator imports from langchain.tools to langchain_core.tools in 3 notebooks
• Updated Send class import from langgraph.constants to langgraph.types in 1 notebook
• Updated requirements.txt with v1 constraints using range specifiers instead of pinned versions

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
requirements.txt	Updated package versions to use v1 constraints with range specifiers
2_1_tool_call.ipynb	Updated tool import to langchain_core.tools and Unicode degree symbol normalization
2_2_react_agent.ipynb	Updated tool import to langchain_core.tools and Unicode degree symbol normalization
3_routing.ipynb	Updated tool import to langchain_core.tools and Unicode degree symbol normalization
5_parallelism.ipynb	Updated Send import from langgraph.constants to langgraph.types

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