docs(langgraph): add Vaultak runtime security integration guide

[Samuel Oladji (samueloladji-beep)]

Summary

• Adds src/oss/langgraph/vaultak.mdx — a new integration guide in the LangGraph Production section covering how to wire Vaultak runtime security into LangGraph agents and StateGraph workflows.
• Updates src/docs.json to add oss/python/langgraph/vaultak to the Production nav group, directly after the existing Observability page.

Integration pattern

VaultakCallbackHandler extends LangChain's BaseCallbackHandler, so it plugs into LangGraph via the standard config dict with zero graph rewrites:

from langchain_vaultak import VaultakCallbackHandler

vaultak = VaultakCallbackHandler(
    api_key="vtk_...",
    agent_name="my-agent",
    block_on_high_risk=True,
    risk_threshold=7.0,
)

# Prebuilt ReAct agent — per invocation
result = agent.invoke(input, config={"callbacks": [vaultak]})

# StateGraph — at compile time (covers every run)
graph = builder.compile().with_config({"callbacks": [vaultak]})

Every tool call is risk-scored (0–10) before execution. Calls above the threshold raise an exception to halt the graph. Tool outputs are scanned for PII before they reach the next node.

Page contents

• Install snippet (pip / uv tabs)
• Prebuilt create_react_agent example with two realistic tools
• Custom StateGraph workflow example with ToolNode
• Per-invocation config pattern (varying threshold per request)
• Configuration reference table
• Event-coverage table (what LangGraph events Vaultak intercepts)

Test plan

• Page renders at /oss/python/langgraph/vaultak without errors
• Nav shows "Vaultak Runtime Security" in the Production group after Observability
• Code blocks render correctly (pip/uv <CodeGroup>, Python snippets)
• All internal links (back to observability, LangSmith docs) resolve

🤖 Generated with Claude Code

[github-actions]

Thanks for opening a docs PR, Samuel Oladji (@samueloladji-beep)! When it's ready for review, please add the relevant reviewers:

• @npentrel or @lnhsingh (LangGraph)
• @mdrxy (Python integrations)

[Samuel Oladji (samueloladji-beep)]

Naomi Pentrel (@npentrel) Lauren Hirata Singh (@lnhsingh) Mason Daugherty (@mdrxy) — ready for review. This adds a Vaultak runtime security integration guide to the LangGraph Production section.

[Lauren Hirata Singh (lnhsingh)]

We do not include third-party integration guides in our main docs set. Please remove this page and move the content into the providers page

[Samuel Oladji (samueloladji-beep)]

Thanks for the review Lauren Hirata Singh (@lnhsingh) — makes sense, happy to follow the convention.

I've moved all the LangGraph content (prebuilt ReAct agent, StateGraph workflow, config reference, and monitoring events table) into the existing providers page (integrations/providers/vaultak.mdx) and removed the standalone langgraph/vaultak.mdx page and its docs.json entry. The branch is updated.