In short: Materiality Master offers an MCP server, so you can connect Claude (Claude Desktop, Claude Code and other MCP-compatible AI tools) to your account. Claude can then read your assessments and add or edit IROs, stakeholders, comments and documents on your behalf. You connect with your Materiality Master login, choose one company per connection and can revoke access at any time.
1. What is MCP?
The Model Context Protocol (MCP) is an open standard that lets AI assistants such as Claude work with other applications in a secure way. Instead of copying data back and forth, you ask Claude, and Claude reads or changes the data in Materiality Master directly.
2. What you can do with it
Examples of what you can ask Claude:
- "List my assessments and show me all material IROs in E1."
- "Compare the ratings of our S1 IROs and suggest which justifications are weak."
- "Add a comment to IRO E1-1 that the energy audit is scheduled for Q2."
- "Add our works council as a stakeholder."
- "Here is the minutes of our stakeholder workshop. Update the IRO descriptions accordingly."
Claude can:
- list and read assessments, IROs, ratings, stakeholders and documents
- add, edit, move and duplicate IROs
- add comments to IROs
- add and edit stakeholders
- add documents (links)
- update company information
- update and archive assessments
Claude cannot delete assessments.
3. Connect Claude Desktop
Your Materiality Master MCP address is:
https://app.materialitymaster.com/api/mcp
You also find it in Materiality Master: open the user menu (your avatar, top right), select Profile and then MCP Connections. Use the copy button there.
- In Claude, open Customize > Connectors, click + Add and choose Add custom connector.
- Enter a name, for example "Materiality Master", paste the address above and click Continue.
- Check the detected sign-in settings and click Continue. Keep Sign in now and the recommended OAuth client, then click Add. Claude opens the Materiality Master sign-in in your browser.
- Sign in with your usual Materiality Master account.
- Under Which company? select the company Claude may work with.
- Review the permissions (read your assessments and IROs; create and edit content) and confirm.
Back in Claude, the connector is active. Start a new chat and ask about your assessments.
Claude Team or Enterprise: An owner of your Claude organisation adds the connector once under Organization settings > Connectors (Add > Custom > Web, then the same name and address as above). Members then open Customize > Connectors, click Connect next to Materiality Master and continue with step 4.
4. Connect Claude Code
Run this command in your terminal:
claude mcp add --transport http materiality-master https://app.materialitymaster.com/api/mcp
Then follow the sign-in in your browser as described above.
5. Manage and revoke connections
- Open the user menu (your avatar), select Profile and then MCP Connections.
- Under Active connections you see every connected client with company, connection date and last use.
- Click Revoke to end a connection immediately.
6. Good to know
- One company per connection. If you work for several companies (for example as a consultant), add one connection per company.
- Locked assessments stay locked. Claude cannot change a locked assessment. See Lock a materiality assessment.
- Review Claude's changes. As with all AI support in the double materiality assessment, check the results before you rely on them.
FAQ
Which AI tools can I connect?
Claude Desktop, Claude Code and other tools that support remote MCP servers with OAuth sign-in.
Do I need a separate password?
No. You sign in with your normal Materiality Master account. Claude never sees your login details.
Can a colleague use my connection?
No. Each person connects their own Claude account with their own Materiality Master login.
What happens to my data in Claude?
What you discuss in Claude is processed under the terms of your Claude plan with Anthropic. Materiality Master only shares the data Claude requests for your connected company.
I don't see any company when connecting. You need access to at least one company. Create or join a company in Materiality Master first, then start the connection again from Claude.