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crd-mcp-server

Testing & Quality
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Provides instructions and a tool for analyzing Custom Resource Definition (CRD) changes, including checking for KRM API structural equivalence and backward compatibility.

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Source SKILL.md: https://github.com/GoogleCloudPlatform/k8s-config-connector/blob/HEAD/.gemini/skills/crd-mcp-server/SKILL.md

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CRD Analyzer

Overview

The crd-mcp-server is a binary tool under dev/tools/crd-mcp-server/ designed to check and validate Custom Resource Definition (CRD) schema changes in the Config Connector repository. It has two main subcommands:

  1. equivalent: Checks whether a CRD change is equivalent to its previous git-committed version (no fields added or removed under spec, no type or CEL validation changes, etc.).
  2. compatible: Checks whether a CRD change is backward compatible with its previous git-committed version (no fields removed or renamed, no incompatible type changes, allowed additions).

This tool is used in presubmits (e.g., dev/ci/presubmits/crd-equivalence-check) to ensure that KRM schemas remain compatible or equivalent during migration from legacy to direct reconcilers.

How to Run

Before running, ensure you run from the repository root. You can build and run the tool directly using go run:

Checking for Equivalence (e.g., during promotion or refactoring)

To check if a changed CRD is equivalent to its version on master:

go run ./dev/tools/crd-mcp-server equivalent --file config/crds/resources/services/v1beta1/service_kind.yaml --ref master

Checking for Backward Compatibility

To check if a changed CRD is backward-compatible with master:

go run ./dev/tools/crd-mcp-server compatible --file config/crds/resources/services/v1beta1/service_kind.yaml --ref master