How to Use the Yousign MCP in LangChain

Q: How do I check my quotas when using Yousign with LangChain?

Just call getconsumption. This tool gives your agent immediate data on API consumption and quota details so it doesn't run into limits mid-chain.

Q: Can Yousign help me start a workflow using LangChain?

Yeah. You use the createrequest tool to draft the initial signature request. Then, your chain can decide if it needs to add signers or check documents before activating.

Q: If I need to list all past jobs for Yousign with LangChain, what do I use?

Use listrequests. This tool provides a complete roster of every signature request in your organization. It's the starting point for any comprehensive audit.

Q: How do I check documents for Yousign with LangChain?

You call listdocuments and provide the specific request ID. That function outputs every document attached to that signature request, letting your chain know what's up.

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Manage signature workflows in steps.

Need to start a new document process? Use `create_request` to draft a signature request. This action gives you the initial ID needed for all subsequent steps. Once you have that ID, your agent can decide whether it needs more signers or if the documents need checking by calling tools like `list_documents` and `add_signer`. The whole flow is traceable in LangSmith.

Monitor and react to signing status.

Check the current state of a process using `get_request`. This tells your agent if the signature request is pending, active, or stalled. You can then write logic that waits for specific statuses before proceeding. If you need to stop everything, calling `cancel_request` permanently halts an ongoing workflow. It’s critical to use this tool only when the reason for cancellation is clear.

Audit and track all requests.

Want a full overview of what's going on? Start by calling `list_requests` to see every signature request in your organization. This provides a list that you can then iterate over. From that master list, you can pull specific details for any single job using `get_request`. It’s how the agent scopes down from 'all jobs' to 'this specific one'.

Setup guide

Set up Yousign MCP in LangChain

Prerequisites

Python 3.10+ installed
langchain-mcp-adapters + langgraph packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run pip install langchain-mcp-adapters langgraph langchain-openai. The MCP adapters package converts MCP tools into native LangChain BaseTool objects.
2

Connect via HTTP transport
Use MultiServerMCPClient with "transport": "http" pointing to your Vinkius endpoint. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Create a ReAct agent
Pass the discovered tools to create_react_agent() from LangGraph. The agent automatically routes Yousign tool calls through the MCP protocol.
4

Run with any LLM
Swap ChatOpenAI for ChatAnthropic, ChatGoogleGenerativeAI, or any LangChain-compatible model. The MCP tools work identically across all providers.

agent.py

from langchain_mcp_adapters.client import MultiServerMCPClient
from langgraph.prebuilt import create_react_agent
from langchain_openai import ChatOpenAI

async with MultiServerMCPClient({
    "yousign-mcp": {
        "transport": "http",
        "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
    }
}) as client:
    tools = client.get_tools()

    agent = create_react_agent(
        ChatOpenAI(model="gpt-4o"),
        tools,
    )
    result = await agent.ainvoke({
        "messages": "List recent Yousign transactions"
    })
    print(result["messages"][-1].content)

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Yousign. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Yousign MCP in LangChain

Just call `get_consumption`. This tool gives your agent immediate data on API consumption and quota details so it doesn't run into limits mid-chain.

Yeah. You use the `create_request` tool to draft the initial signature request. Then, your chain can decide if it needs to add signers or check documents before activating.

Use `list_requests`. This tool provides a complete roster of every signature request in your organization. It's the starting point for any comprehensive audit.

The server touches API consumption and quota details. This is technical usage metadata, so you know exactly how much your agent is pulling from the service.

You call `list_documents` and provide the specific request ID. That function outputs every document attached to that signature request, letting your chain know what's up.

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