How to Use the Yousign MCP in LangChain

Q: Does Yousign update existing contacts for LangChain?

You can manage your address book using createyousigncontact and listyousigncontacts. These tools allow your agent to ensure the signers it targets are correctly recorded in the system.

Manage e-signatures and contracts with LangChain.

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Connect Yousign MCP to LangChain

Create your Vinkius account to connect Yousign to LangChain and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Yousign with LangChain

Ask AI about this MCP

ChatGPT

Claude

Perplexity

Automate New Signing Workflows

Your agent starts by creating a new signature process using `create_signature_request`. Then, it adds all necessary files via `add_document_to_request` and specifies who needs to sign with `add_signer_to_request`. The whole sequence happens in one chain run.

Check Status and Retrieve Evidence

Need to know where a contract stands? Use `get_signature_request` to pull the current status. If everything's done, you grab the proof link using `get_audit_trail_link`. This allows your agent to report back exactly what happened.

Manage Contacts and Requests

Keep things clean by listing all open files with `list_signature_requests`. You can also manage the address book directly using `create_yousign_contact` or `list_yousign_contacts`. It keeps your agent's context accurate.

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-alternative-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

It treats every tool call as a discrete step. Your agent calls `create_signature_request`, and the output (the new request ID) becomes the input for calling `add_document_to_request` next. It's just another link in your reasoning chain.

Yeah, it can. If a contract needs to be stopped before signing, the agent executes `cancel_ongoing_request`. This is useful for multi-step workflows where conditions change mid-process.

The MCP Server handles documents and contracts. When you query the status, you're working with signature request metadata. The agent can retrieve this information to make decisions downstream.

You can manage your address book using `create_yousign_contact` and `list_yousign_contacts`. These tools allow your agent to ensure the signers it targets are correctly recorded in the system.

You're dealing with signature requests. The server handles metadata about documents and contracts. Always verify that your agent only accesses the necessary request details via `get_signature_request`.

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