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The Postman MCP Server connects AI agents to the full breadth of Postman’s API management platform, enabling automated control over workspaces, collections, environments, specifications, mocks, and monitors. Within Caylex, AI agents can translate natural language commands into Postman API workflows — creating and tagging collections, updating request documentation, managing environment variables, synchronizing code with specifications, and orchestrating multi-step API processes without manual intervention. The server supports two authentication modes: OAuth for standard accounts and API key authentication for all regions including EU. This makes it a powerful tool for teams building AI-driven API lifecycle automation, from rapid prototyping to ongoing collection and workspace management.
Prerequisites:
  • A Postman account with API access is required; generate a Postman API key from your Postman account settings before connecting.
  • OAuth authentication is available for standard (non-EU) regions; EU region users must use API key authentication only.
  • Access to the relevant Postman workspaces, collections, or environments you intend to manage via the AI agent.
Important API details:
  • EU region users must authenticate using an API key — OAuth is not supported for the EU Postman MCP server.
  • The server supports different tool configurations (Full, Code, Minimal) which expose different subsets of tools depending on your use case.
  • For EU region usage, the server targets a separate regional endpoint; ensure your Caylex project is configured with the appropriate regional setting.
  • A complete and up-to-date list of available tools is maintained in the Postman MCP server public collection on the Postman API Network.

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Server Details

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Authentication

This server supports the following authentication method:

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Header Authentication

This server authenticates via HTTP headers. During the server onboarding flow, you will be prompted to confirm the required headers. Note that you do not provide the values for the headers during the server on-boarding. Header values are provided by the users during the Auth Link flow.

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Server Configuration

The following parameters can be set in the server URL when adding this server to your Caylex project:

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Getting Started

1

Add the server

Navigate to the Server Library and click on the New Server button. Find Postman in the Caylex Catalog.
2

Server Onboarding flow

Go through the server onboarding flow.
3

Use in a project

Add the server to a project by configuring project connections. Its tools are now available to any agents connected to that project.

Github

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References

https://learning.postman.com/docs/developer/postman-api/postman-mcp-server/set-up-postman-mcp-server

https://learning.postman.com/docs/postman-ai/mcp-servers/overview