How to Use the eSign (e签宝) MCP in Google ADK

Connect eSign (e签宝) directly to your BigQuery data using Google ADK to run legal workflows with Gemini over an MCP connection.

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Connect eSign (e签宝) MCP to Google ADK

Create your Vinkius account to connect eSign (e签宝) to Google ADK 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 eSign (e签宝) with Google ADK

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Run legal workflows from BigQuery data using Google ADK

Pull customer records from BigQuery and call `create_sign_flow` directly using Gemini's long-context reasoning. Your agent uses `list_templates` to find the correct legal template matched to the customer's region. It then populates the contract details and prepares the document for signature in a single step.

Execute and distribute contracts using this MCP Server

Executing contracts requires precise coordination, starting when your Google ADK agent calls `add_docs` to attach the compiled PDF files. Once everything is set, the agent triggers `start_flow` to launch the signature process. It retrieves the signing link via `get_execute_url` and hands it off to your communication tools.

Audit and archive completed documents in Google Cloud

Keep your record-keeping systems updated automatically by using `list_sign_flows` to scan for completed agreements. Completed documents are pulled down using `download_docs`. Your agent can then save these PDFs straight into Cloud Storage, maintaining a clean, automated audit trail.

Setup guide

Set up eSign (e签宝) MCP in Google ADK

Prerequisites

Python 3.10+ installed
google-adk package (pip install google-adk)
Active Vinkius subscription with a valid endpoint token

1

Install Google ADK

Run pip install google-adk to install the Agent Development Kit. MCP support is included via the McpToolset class.
2

Connect via SSE transport

Use McpToolset.from_server() with SseServerParams pointing to your Vinkius endpoint. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Create an LlmAgent

Pass the returned mcp_tools list directly to LlmAgent(tools=mcp_tools). The ADK maps each MCP tool to a native Gemini function call — no manual schema definitions required.
4

Run with any Gemini model

The agent works with any Gemini model (gemini-2.0-flash, gemini-2.5-pro, etc.). Copy the full example on the right to get started with eSign (e签宝) tools in your ADK agent.

agent.py

from google.adk.agents import LlmAgent
from google.adk.tools.mcp_tool.mcp_toolset import McpToolset
from google.adk.tools.mcp_tool.mcp_session_manager import SseServerParams

# Connect to the MCP via SSE
mcp_tools, exit_stack = await McpToolset.from_server(
    connection_params=SseServerParams(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    )
)

# Create your agent with auto-discovered tools
agent = LlmAgent(
    name="eSign (e签宝)_agent",
    model="gemini-2.0-flash",
    instruction="You have access to eSign (e签宝) tools via MCP.",
    tools=mcp_tools,
)

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by eSign (e签宝). 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 eSign (e签宝) MCP in Google ADK

Install google-adk and initialize the McpToolset pointing to your Vinkius HTTP URL. Pass this toolset into your LlmAgent to let Gemini call the signing tools natively.

No, the agent cannot sign on behalf of users. Instead, it uses get_execute_url to generate the secure link where the actual human must complete the identity verification and signing process.

The ADK passes API responses directly to Gemini, allowing the model to analyze the error. If a call to start_flow fails, the agent reads the error message and can retry or alert your team.

Yes, you can use the optional tool names filter when setting up your toolset. This lets you expose only specific tools like get_sign_flow while blocking destructive or high-privilege actions.

Only the metadata required for the signature process, such as signer names and document hashes, is processed. All data flows directly between Google Cloud and the eSign API, with Vinkius ensuring zero-trust, ephemeral execution.

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