A Practical MCP Vendor Due Diligence Questionnaire for Advisory Firms

Adopting the Model Context Protocol (MCP) to connect AI assistants with live business data requires careful evaluation of third-party software vendors. For advisory firms handling confidential client information, a structured due diligence process is not just a best practice; it is a necessity for managing risk and meeting fiduciary responsibilities. This questionnaire provides a framework for assessing the security posture of an MCP server or connector provider before integrating it into your workflows.

The business problem: managing third-party risk with client data

As a private equity, M&A, or financial advisory firm, you are a custodian of highly sensitive client data. Introducing any new technology that accesses systems like an ERP, CRM, or virtual data room (VDR) creates a potential new vector for a data breach. A security vulnerability in a third-party MCP vendor's software could expose your client's confidential information, leading to significant financial, reputational, and legal damage.

A formal due diligence process using a standardized questionnaire accomplishes several goals. It forces a systematic review of a vendor's security controls, creates a documented record of your firm's diligence efforts for compliance and audits, and provides a basis for comparing multiple vendors. It helps ensure that any tool you adopt aligns with your firm's security policies and your clients' expectations for data protection.

Illustrative example: an M&A advisor vets an MCP connector

An M&A advisory firm wants to pilot an MCP connector that would allow its deal team's AI assistant to query documents inside a client's Intralinks VDR. The goal is to speed up due diligence by asking natural language questions about the deal data. Before proceeding, the firm's IT security lead uses the questionnaire below to evaluate the proposed MCP connector vendor.

They pay special attention to sections on Identity and Access Management, ensuring the connector can integrate with their firm's SSO to enforce the same permissions as the VDR itself. They confirm the connector operates in a strictly read-only mode and cannot modify or delete VDR documents. Finally, they review the vendor's audit logging capabilities to ensure a clear record of which user's AI assistant queried which information and when. Based on the vendor's satisfactory responses and a review of their SOC 2 Type II report, the firm approves a limited trial for a single deal.

Asset: MCP vendor due diligence questionnaire

Use this checklist as a starting point for your vendor conversations. Not all questions will apply to every vendor or deployment model (e.g., hosted vs. self-hosted). Add your own firm-specific and client-specific requirements.

Vendor and Service Overview

• What is the full legal name and address of the vendor company?
• What is the specific name of the MCP server/connector product or service being evaluated?
• Is the service a multi-tenant hosted platform, or is it single-tenant/self-hosted software?
• Provide contact information for your security and compliance teams.

Identity and Access Management

• How does the service authenticate users? Does it support SAML 2.0 or OIDC for Single Sign-On (SSO) with our identity provider (e.g., Azure AD, Okta)?
• How are user permissions and access roles managed? Can roles be mapped from our identity provider?
• Describe the process for provisioning and de-provisioning user access. How is access revoked for departing employees or when a project ends?
• Does the service support multi-factor authentication (MFA)? Is it enforced by default?
• How does the service ensure access is segregated between different clients in a multi-client advisory environment? (See our guide on multi-tenant security).

Data Handling and Hosting

• If hosted, in which geographic regions are your data centers located? Do you offer region-specific hosting?
• Is client data encrypted at rest and in transit? Specify the encryption standards used (e.g., AES-256, TLS 1.2+).
• Does your service store or cache any client data? If so, what data is stored, for how long, and for what purpose?
• What is your data retention policy for any cached data or logs? What is the process for data deletion upon contract termination?
• Who are your cloud sub-processors (e.g., AWS, Google Cloud, Azure)?

Security Features and Auditing

• Does the MCP service have capabilities to modify or write data back to the source system? Can these be disabled to enforce a read-only state?
• What level of audit logging is available? Do logs record the user identity, source IP, timestamp, action performed, and the target resource for every request?
• How can we access these audit logs? Are they available via an API or a management console?
• What is the retention period for audit logs?
• What measures are in place to protect against common web application vulnerabilities, such as prompt injection, insecure direct object references, and cross-site scripting (XSS)?

Incident Response and Business Continuity

• Do you have a documented security incident response plan? Can you provide a summary?
• What is your policy and process for notifying customers in the event of a security breach involving their data? What are the notification timelines?
• Do you have a documented disaster recovery and business continuity plan? Can you share key metrics like Recovery Time Objective (RTO) and Recovery Point Objective (RPO)?
• Have you conducted third-party penetration tests of your service? Can you share a summary or attestation letter?

Compliance and Certifications

• Does your organization maintain any security certifications, such as SOC 2 Type II, ISO 27001, or CSA STAR?
• If so, can you provide a copy of the relevant report or certificate for our review?
• How does your service help our firm comply with data privacy regulations like GDPR or CCPA?

Prerequisites and limitations

Prerequisites: To use this questionnaire effectively, your firm should have a designated security or IT lead to review vendor responses. This individual should be familiar with your firm's internal security policies, risk tolerance, and the specific compliance requirements of your clients.

Limitations: This questionnaire is a template and not a substitute for professional legal or security consultation. Vendor self-attestations should be verified with independent documentation (like a SOC 2 report) wherever possible. This process evaluates the security of the MCP vendor; it does not assess the functional performance of their product. Most importantly, this diligence process covers the use of MCP for access to data. It does not establish the right to sell, redistribute, or license client data for AI training. Data licensing rights are a completely separate legal and commercial matter requiring explicit authorization from the data owner.

Questions to ask your software provider or implementation team

Before you sign a contract, discuss these points with your internal team or implementation partner.

1. How will this MCP server integrate with our existing identity provider (e.g., Azure AD, Okta)? What is the estimated effort?
2. What is our firm's policy for connecting third-party tools to client systems like a QuickBooks or NetSuite instance?
3. Who will be responsible for configuring and monitoring the audit logs from the MCP server?
4. How will we configure the tool and our processes to ensure that access is segregated between different client engagements, preventing data cross-contamination?
5. What is our standard operating procedure for revoking access for team members who leave the firm or when a client engagement ends?

Next step with SourceX

The process of vetting an MCP vendor forces a detailed look at a company's data governance, access controls, and record-keeping quality. As you perform this diligence for your clients or portfolio companies, you are also effectively assessing their readiness for other data opportunities.

Well-governed, high-quality operational data may be a valuable asset for external AI training. SourceX builds, contracts, and manages the supply and transaction layer for AI data, helping companies license their anonymized business records to AI labs and data buyers. Our partner program is designed for advisors who can make qualified, permissioned introductions to decision-makers at these companies.

Use our free, confidential Company Fit Checker tool to see if a client might qualify for data licensing. As a SourceX partner, you receive 25% of the platform fees SourceX collects, up to $100,000 per referred company, for successful introductions.

Related MCP guides

• MCP Security Checklist for CFO, M&A and PE Firms
• A Practical Guide to Multi-Client MCP Security
• MCP, SOC 2 and ISO 27001: Controls Buyers Will Ask About
• All MCP resources

Sources

• Intralinks confidential deal data (Current guide)
• OWASP MCP security cheat sheet (Current security guidance)
• Enterprise-managed authorization (June 18 2026)

Vendor capabilities change. Check current official documentation before relying on any product detail.