Just-in-Time Integrations

Just-in-Time Integrations

"We don't have 500+ stale integrations. We have infinite fresh ones."

Traditional frameworks ship with massive libraries of "wrappers" (e.g., LangChain.tools.HubSpotTool). These are often:

1. Outdated: APIs change faster than framework maintainers can merge PRs.
2. Bloated: You import a massive library just to update one record.
3. Black Box: You don't know how it handles errors or retries until it crashes.

Lár takes a different approach: The Integration Builder.

The Workflow

Instead of waiting for us to build a tool for Stripe, Linear, or Notion, you generate it yourself in 30 seconds.

1. The Integration Prompt

We provide a specialized prompt file: lar/IDE_MASTER_PROMPT.md.

"Read lar/IDE_MASTER_PROMPT.md and lar/examples/ first." This file teaches your IDE (Cursor, Windsurf, Copilot) the "Gold Standard" for writing robust Lár ToolNode wrappers.

2. How to Use It

1. Open your IDE (Cursor/Windsurf recommended).
2. Drag & Drop lar/IDE_MASTER_PROMPT.md into the chat context.
3. Ask: "Make me a Lár tool that searches Linear tickets."

3. The Result

Your IDE will read the prompt and generate a production-ready file that:

1. Imports the official SDK (e.g., linear-sdk).
2. Authenticates using os.getenv.
3. Wraps the logic in a deterministic function.
4. Returns a flat dictionary for GraphState merging.
5. Wraps it all in a ToolNode.

Example Output:

# Generated in < 30s
from lar import ToolNode
import linear_sdk

def search_linear(state):
    # Authenticate
    # Search
    # Return Dict
    pass

linear_tool = ToolNode(
    tool_function=search_linear,
    input_keys=["query"],
    output_key="tickets",
    next_node=None
)

Why this wins

• You Own It: The code is in your repo, visible and editable.
• Always Fresh: You stick to the latest official SDK, not a wrapper.
• Zero Dependencies: You don't need to install lar-hubspot or lar-stripe. Just lar and hubspot-client.

Proof of Concept

Check out examples/patterns/7_integration_test.py to see a generated integration for the CoinCap API.