> For the complete documentation index, see [llms.txt](https://docs.parallels.com/landing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.parallels.com/landing/ras-cpf-integration-guide/custom-provider-framework/connector-design-principles.md).

# Connector Design Principles

We recommend that you follow these principles:

* Keep the connector state local to the running process. Avoid a shared global state that could break concurrent execution.
* Return structured errors rather than free-form output. The sample scripts use JSON-RPC-style error codes for parse, method, parameter, and internal errors.
* Treat **stdout** as the protocol channel and reserve **stderr** for diagnostics.
* Expect versioned evolution. Future protocol changes should be additive or guarded by version/capability checks.


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