How do I find my eSign App ID and Secret?

Log in to the [eSign Open Platform](https://open.esign.cn/), create a new application, and you will find your App ID and App Secret in the application credentials section.

Can I retrieve the signing URL for a participant?

Yes. Use the `get_execute_url` tool with the flow ID and the signer's account ID. Your agent will retrieve the unique URL where the participant can perform the signature.

Is it possible to download the signed documents?

Yes! Once a sign flow is completed, you can use the `download_docs` tool to retrieve temporary download links for all documents included in that flow.

eSign (e签宝) MCP Server for Pydantic AI 10 tools — connect in under 2 minutes

Name: eSign (e签宝)
Availability: InStock
Author: Vinkius

ai.pydantic.dev/mcp

Built by Vinkius GDPR 10 Tools SDK

Pydantic AI brings type-safe agent development to Python with first-class MCP support. Connect eSign (e签宝) through Vinkius and every tool is automatically validated against Pydantic schemas. catch errors at build time, not in production.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

Open in ChatGPT Open in Claude Open in Perplexity

Vinkius supports streamable HTTP and SSE.

python

import asyncio
from pydantic_ai import Agent
from pydantic_ai.mcp import MCPServerHTTP

async def main():
    # Your Vinkius token. get it at cloud.vinkius.com
    server = MCPServerHTTP(url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp")

    agent = Agent(
        model="openai:gpt-4o",
        mcp_servers=[server],
        system_prompt=(
            "You are an assistant with access to eSign (e签宝) "
            "(10 tools)."
        ),
    )

    result = await agent.run(
        "What tools are available in eSign (e签宝)?"
    )
    print(result.data)

asyncio.run(main())

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* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About eSign (e签宝) MCP Server

Empower your AI agent to orchestrate your digital agreement lifecycle with eSign (e签宝), the premier electronic signature platform in China. By connecting eSign to your agent, you transform complex contract workflows and document signing into a natural conversation. Your agent can instantly list your sign flows, create new signature tasks, manage document templates, and even retrieve signing URLs for participants without you ever needing to navigate the comprehensive eSign portal. Whether you are managing high-volume employee contracts or complex B2B agreements, your agent acts as a real-time legal operations assistant, keeping your documents secure and your business moving.

Pydantic AI validates every eSign (e签宝) tool response against typed schemas, catching data inconsistencies at build time. Connect 10 tools through Vinkius and switch between OpenAI, Anthropic, or Gemini without changing your integration code. full type safety, structured output guarantees, and dependency injection for testable agents.

What you can do

Sign Flow Orchestration — Create and manage digital signature workflows with full support for documents and signers.
Template Management — Browse predefined document templates to accelerate your contract production.
Signature Tracking — Monitor the real-time status of active sign flows and retrieve execution URLs for participants.
Document Control — Add PDF documents to signature tasks and retrieve download links for completed agreements.
Organization Insights — Retrieve high-level information about your enterprise eSign account and authorization status.

The eSign (e签宝) MCP Server exposes 10 tools through the Vinkius. Connect it to Pydantic AI in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect eSign (e签宝) to Pydantic AI via MCP

Follow these steps to integrate the eSign (e签宝) MCP Server with Pydantic AI.

Install Pydantic AI

Run pip install pydantic-ai

Replace the token

Replace [YOUR_TOKEN_HERE] with your Vinkius token

Run the agent

Save to agent.py and run: python agent.py

Explore tools

The agent discovers 10 tools from eSign (e签宝) with type-safe schemas

Why Use Pydantic AI with the eSign (e签宝) MCP Server

Pydantic AI provides unique advantages when paired with eSign (e签宝) through the Model Context Protocol.

Full type safety: every MCP tool response is validated against Pydantic models, catching data inconsistencies before they reach your application

Model-agnostic architecture. switch between OpenAI, Anthropic, or Gemini without changing your eSign (e签宝) integration code

Structured output guarantee: Pydantic AI ensures tool results conform to defined schemas, eliminating runtime type errors

Dependency injection system cleanly separates your eSign (e签宝) connection logic from agent behavior for testable, maintainable code

eSign (e签宝) + Pydantic AI Use Cases

Practical scenarios where Pydantic AI combined with the eSign (e签宝) MCP Server delivers measurable value.

Type-safe data pipelines: query eSign (e签宝) with guaranteed response schemas, feeding validated data into downstream processing

API orchestration: chain multiple eSign (e签宝) tool calls with Pydantic validation at each step to ensure data integrity end-to-end

Production monitoring: build validated alert agents that query eSign (e签宝) and output structured, schema-compliant notifications

Testing and QA: use Pydantic AI's dependency injection to mock eSign (e签宝) responses and write comprehensive agent tests

eSign (e签宝) MCP Tools for Pydantic AI (10)

These 10 tools become available when you connect eSign (e签宝) to Pydantic AI via MCP:

add_docs

Add documents to flow

add_signers

Add signers to flow

create_sign_flow

Create a new sign flow

download_docs

Download flow documents

get_execute_url

Get signature URL

get_org_info

Get organization details

get_sign_flow

Get sign flow details

list_sign_flows

List sign flows

list_templates

List sign templates

start_flow

Start sign flow

Example Prompts for eSign (e签宝) in Pydantic AI

Ready-to-use prompts you can give your Pydantic AI agent to start working with eSign (e签宝) immediately.

"List all active signature flows on eSign."

"Get the signing URL for account 'acc-8821' in flow 'flow-9920'."

"Show me all available document templates."

Troubleshooting eSign (e签宝) MCP Server with Pydantic AI

Common issues when connecting eSign (e签宝) to Pydantic AI through the Vinkius, and how to resolve them.

MCPServerHTTP not found

Update: pip install --upgrade pydantic-ai

eSign (e签宝) + Pydantic AI FAQ

Common questions about integrating eSign (e签宝) MCP Server with Pydantic AI.

How does Pydantic AI discover MCP tools?

Create an MCPServerHTTP instance with the server URL. Pydantic AI connects, discovers all tools, and generates typed Python interfaces automatically.

Does Pydantic AI validate MCP tool responses?

Yes. When you define result types as Pydantic models, every tool response is validated against the schema. Invalid data raises a clear error instead of silently corrupting your pipeline.

Can I switch LLM providers without changing MCP code?

Absolutely. Pydantic AI abstracts the model layer. your eSign (e签宝) MCP integration works identically with OpenAI, Anthropic, Google, or any supported provider.