# Learn About Flow Invocation Schemas

A [flow invocation schema](https://prismatic.io/docs/ai/flow-invocation-schema.md) gives the Prismatic MCP server information about using your workflow as an MCP tool, including a description of what the flow does and what inputs it requires. This video covers how to create a flow invocation schema and mark your flow as an MCP tool.

While we cover some things you can do with schema, like `enums` and constraints, our video is not exhaustive to everything you can do with input schema. Additional information about `inputSchema` is available on Specification Enhancement Proposal [SEP-2106](https://modelcontextprotocol.io/seps/2106-json-schema-2020-12).