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# MCP Schema Validation

The MCP Schema Validation policy validates MCP requests to ensure they conform to the MCP specification

For configuration details, see [MCP Schema Validation Policy](https://docs.mulesoft.com/gateway/latest/policies-included-mcp-schema-validation).

## [](#september-2-2026)September 2, 2026

### Fixed Issues

- MCP Schema Validation policy definition and implementation version 1.3.0 is now supported by Omni Gateway.
- The policy no longer rejects valid MCP methods from the MCP `2025-06-18` and `2025-11-25` specifications. These methods are now correctly recognized:
    
    - `elicitation/create`
    - `sampling/createMessage`
    - `roots/list`
    - `notifications/message`
    - `notifications/resources/list_changed`
    - `notifications/resources/updated`
    - `notifications/prompts/list_changed`
    - `notifications/tools/list_changed`
    - `notifications/elicitation/complete`

## [](#august-10-2026)August 10, 2026

### What’s New

- MCP Schema Validation policy definition and implementation version 1.2.0 is now supported by Omni Gateway.
- Added the **Tool Poisoning Detection** parameter, which detects tool-poisoning attacks against MCP `tools/list` responses by pinning the trusted tool set from the API’s Anypoint Exchange asset and comparing every backend `tools/list` response against it.

## [](#may-20-2026)May 20, 2026

### What’s New

- MCP Schema Validation policy implementation version 1.1.2 is now supported by Omni Gateway.

## [](#april-20-2026)April 20, 2026

### What’s New

- MCP Schema Validation policy definition version 1.1.1 is now supported by Omni Gateway.