openapi-schema-best-practices

name

openapi-schema-best-practices

description

Create, audit, and maintain OpenAPI schemas in meshery/schemas following established conventions. Use this skill whenever working with OpenAPI YAML files, adding new API constructs, reviewing schema consistency, checking naming conventions, validating $ref patterns, or understanding how schemas flow through the Go and TypeScript code generators. Also trigger when the user mentions schema audits, API consistency checks, schema linting, construct definitions, or asks about the build pipeline (bundle-openapi, generate-golang, generate-typescript). If the user is creating a schema from a Golang model, prefer the create-openapi-schemas-from-golang-models skill instead.

OpenAPI Schema Best Practices

Canonical naming contract - see docs/identifier-naming-contributor-guide.md in meshery/schemas (https://github.com/meshery/schemas/blob/master/docs/identifier-naming-contributor-guide.md) for the full directory (26-row naming table with before/after and do/don't examples). The inline rules below remain the skill's authority for its workflow scope; the guide is the reader-friendly cross-repo reference.

You are an expert in Meshery's Schema-Driven Development (SDD) system. Your job is to help create new OpenAPI schemas, audit existing ones for consistency, and ensure the entire schema ecosystem stays coherent as it grows.

Before doing any schema work, read .claude/agents/code-contributor.md and AGENTS.md in the repository root - they contain critical constraints you must follow (especially: never commit generated code).

How this repository works

Meshery defines its data model as OpenAPI 3.0 YAML schemas under schemas/constructs/. A build pipeline then generates Go structs and TypeScript types from those schemas automatically. The schemas are the single source of truth - never hand-edit generated files.

Build pipeline overview

schemas/constructs/**/*.{yaml,yml}  (you write these)
    │
    ▼
  bundle-openapi.js           (dereferences + merges in-process)
    │
    ▼
  _openapi_build/**/*.json    (intermediate bundled JSON)
    │
    ├──▶ generate-golang.js     (reads source api.yml packages + reachable refs)
    │      └──▶ models/**/*.go  (oapi-codegen)
    ├──▶ generate-typescript.js → typescript/generated/  (openapi-typescript)
    └──▶ generate-rtk.js        → typescript/rtk/        (RTK Query hooks)

Note: generate-golang.js reads source api.yml files directly (not the bundled JSON), but the standard build (make build) still runs bundle-openapi first because Go generation depends on it in both the Makefile and build/index.js.

Understanding this pipeline matters because schema design decisions directly affect the quality of generated code. A poorly structured schema produces awkward Go structs and confusing TypeScript types.

How code generators consume schemas

Go generator (build/generate-golang.js):

• Reads source schemas/constructs/**/api.yml packages directly
• Stages temporary package-local specs and rewrites reachable cross-package refs
• Generates Go structs with JSON + YAML struct tags
• Collects x-oapi-codegen-extra-tags, x-go-name, and x-go-type metadata across direct $ref and allOf composition
• Builds import mappings from external $ref targets so cross-package types resolve correctly
• Rewrites external import aliases using explicit x-go-type-import.name values when provided
• Derives repetitive Go helper methods from generated package/type structure instead of relying on a hand-maintained package manifest
• Uses oapi-codegen v2.x (pinned via tool directive in go.mod) under the hood

TypeScript generator (build/generate-typescript.js):

• Reads the same bundled JSON
• Produces TypeScript type definitions via openapi-typescript
• Also exports JSON schema as TypeScript const objects (*Schema.ts)

RTK Query generator (build/generate-rtk.js):

• Reads filtered merged specs (cloud_openapi.yml, meshery_openapi.yml)
• Generates RTK Query hooks from the paths defined in api.yml files
• Tags endpoints using x-internal to split between cloud and meshery APIs

Package discovery

The build system discovers packages dynamically by walking schemas/constructs/<version>/ and finding directories that contain an api.yml file. This means:

• Every new construct needs an api.yml to be picked up by the build
• The directory name becomes the package name (with some overrides, e.g. design → pattern)
• Some packages are excluded from merging: v1alpha1/core and v1alpha1/capability

Directory structure for a construct

schemas/constructs/<version>/<construct>/
├── api.yml                          # Index file (required): aggregates subschemas + defines API paths
├── <construct>.yaml                 # Subschema: main data definitions
├── <construct>_core.yml             # Subschema: core definitions (optional)
└── templates/
    ├── <construct>_template.json    # Default-value template
    ├── <construct>_template.yaml    # YAML variant (optional)
    └── <construct>_minimal_template.json  # Minimal variant (optional)

The api.yml is the entry point. It references subschemas via $ref and defines REST endpoints under paths:. Code generators only read api.yml - subschemas are pulled in through references.

Naming conventions

These conventions apply to all new additions (properties, paths, operationIds, etc.) for consistency across APIs. Some legacy and DB-mirrored fields are explicit exceptions, as noted below:

Element	Convention	Examples
Non-DB-mirrored schema property names	camelCase	schemaVersion, displayName, componentsCount
Identifier fields	camelCase + "Id" suffix	modelId, registrantId, categoryId
New enum values	lowercase	enabled, ignored, duplicate
Schema component names	PascalCase	ModelDefinition, ComponentDefinition
File/folder names	lowercase, underscores OK	model.yaml, model_core.yml, api.yml
API paths	/api prefix, kebab-case, plural nouns	/api/workspaces, /api/environments
Path parameters	camelCase	{subscriptionId}, {connectionId}
operationId	lower camelCase verbNoun	getAllRoles, listUsers
Version strings	k8s-style	v1alpha1, v1beta1
schemaVersion	group/version	models.meshery.io/v1beta1

Path parameters must use camelCase with the Id suffix - never SCREAMING_CASE or snake_case:

Correct	Wrong
{orgId}	{orgID}, {org_id}
{workspaceId}	{workspaceID}
{connectionId}	{connectionID}, {connection_id}

Casing rules - single authoritative reference

Every element has exactly one correct casing. Use this table for all decisions:

Element	Casing	Example	Counter-example
Schema property names (non-DB)	camelCase	schemaVersion, displayName	schema_version, SchemaVersion
ID-suffix properties	camelCase + Id	modelId, registrantId	modelID, model_id
DB-backed / DB-mirrored fields	exact snake_case db column name	created_at, updated_at, user_id, first_name, plan_id	createdAt, firstName, planId
New enum values	lowercase	enabled, ignored	Enabled, ENABLED
components/schemas names	PascalCase	ModelDefinition, KeychainPayload	modelDefinition
File and folder names	lowercase	api.yml, keychain.yaml	Keychain.yaml
Path segments	kebab-case plural nouns	/api/role-holders	/api/roleHolders
Path parameters	camelCase + Id suffix	{orgId}, {workspaceId}	{orgID}, {org_id}
operationId	lower camelCase verbNoun

The database naming is the compatibility boundary. If a property has x-oapi-codegen-extra-tags.db and that db value is snake_case, then the schema property name and JSON tag must use that exact snake_case name. Do not camelize DB-backed fields in-place within an existing API version.

Partial casing migrations are forbidden. Do not rename selected fields within the same resource from snake_case to camelCase while leaving other published fields unchanged. If the wire format must change, introduce a new API version and migrate the resource consistently there.

Existing enum wire values are compatibility-sensitive. Use lowercase for newly introduced enum literals, but do not recase published enum values in-place within the same API version. The validator exempts legacy enum values that already exist on the baseline branch.

Pagination envelopes are fixed API contract fields - use page, page_size, and total_count, not pageSize or totalCount.

Exceptions for DB-mirrored/system fields

Some fields intentionally remain snake_case to mirror existing database columns and historical schemas. Common examples are created_at, updated_at, and user_id. Do not rename these to camelCase in existing schemas. These DB-mirrored/system fields are the only allowed snake_case properties; all other (non-DB-mirrored) property names MUST follow the camelCase rules above.

Common schema references

The v1alpha1/core/api.yml file defines reusable building blocks. Always reference these instead of redefining them:

# Timestamps - use the core refs, not inline definitions
created_at:
  $ref: ../../v1alpha1/core/api.yml#/components/schemas/created_at
  x-order: 14
updated_at:
  $ref: ../../v1alpha1/core/api.yml#/components/schemas/updated_at
  x-order: 15

# UUIDs
id:
  $ref: ../../v1alpha1/core/api.yml#/components/schemas/uuid

# Version strings
version:
  $ref: ../../v1alpha1/core/api.yml#/components/schemas/versionString

# Semver
semver:
  $ref: ../../v1alpha1/core/api.yml#/components/schemas/semverString

When using a $ref to a core schema that already defines x-oapi-codegen-extra-tags, do NOT add redundant tags - they're already in the core definition.

For schemas in v1alpha3, the relative path is shorter: ../v1alpha1/core/api.yml#/...

Schema design patterns

HTTP API Design Principles

These rules govern how endpoints are structured. Violations are caught by make validate-schemas.

HTTP method semantics

Use case	Method	Example
Create a resource	POST	POST /api/workspaces → 201
Upsert (create or update)	POST	POST /api/keys → 200
Update an existing resource	PUT or PATCH	PUT /api/workspaces/{workspaceId} → 200
Non-CRUD action	POST to a sub-resource	POST /api/invitations/{invitationId}/accept → 200
Bulk delete	POST to a /delete sub-resource	POST /api/designs/delete → 200
Single delete	DELETE	DELETE /api/keys/{keyId} → 204

Critical: Never use DELETE with a request body. REST semantics don't define request bodies for DELETE; HTTP clients and proxies may strip them silently. Bulk deletes must use POST /api/{resources}/delete.

# WRONG - DELETE with a body; clients/proxies may silently strip it
delete:
  operationId: deletePatterns
  requestBody:
    content:
      application/json:
        schema:
          $ref: '#/components/schemas/PatternIds'

# CORRECT - POST sub-resource for bulk delete
post:
  operationId: deletePatterns
  summary: Bulk delete patterns by ID
  requestBody:
    content:
      application/json:
        schema:
          $ref: '#/components/schemas/PatternIds'
  responses:
    "200":
      description: Patterns deleted

HTTP response codes

Code	Meaning	When to use
200	OK	Request succeeded; body contains result (queries, upserts, actions)
201	Created	A new resource was created; body contains the new resource
202	Accepted	Request accepted; operation completes asynchronously
204	No Content	Request succeeded; no response body (e.g., single-resource DELETE)

Use 201 (not 200) when a POST endpoint exclusively creates a new resource.

Response descriptions and response message text must not include the word successfully. Use neutral wording such as Connection deleted, Webhook processed, or Plans response.

Resource grouping

Endpoints are grouped into logical categories:

Category prefix	Domain
/api/identity/	Users, orgs, roles, teams, invitations
/api/integrations/	Connections, environments, credentials
/api/content/	Designs, views, components, models
/api/entitlement/	Plans, subscriptions, features
/api/auth/	Tokens, keychains, keys

New endpoints must be placed in the appropriate category. Path segments are kebab-case plural nouns.

---

The Dual-Schema Pattern (REQUIRED for all entity schemas)

Every persisted entity MUST follow this pattern. Violating it causes generated Go structs and API clients in downstream repos (meshery/meshery, layer5io/meshery-cloud) to require clients to supply server-generated fields.

Rule 1 - <construct>.yaml is a response schema only

The YAML file is the full server-side object as returned in API responses. It is never a request body.

Requirements:

• additionalProperties: false at the top level
• All server-generated fields (id, created_at, updated_at, deleted_at) in properties
• Server-generated fields that are always present in responses listed in required

# CORRECT: keychain.yaml
type: object
additionalProperties: false
required:
  - id
  - name
  - owner
  - created_at
  - updated_at
properties:
  id:
    $ref: ../../v1alpha1/core/api.yml#/components/schemas/uuid
  name:
    type: string
  owner:
    $ref: ../../v1alpha1/core/api.yml#/components/schemas/uuid
  created_at:
    $ref: ../../v1alpha1/core/api.yml#/components/schemas/created_at
  updated_at:
    $ref: ../../v1alpha1/core/api.yml#/components/schemas/updated_at
  deleted_at:
    $ref: ../../v1alpha1/core/api.yml#/components/schemas/nullTime

Rule 2 - Define a {Construct}Payload in api.yml for every writable entity

Every entity with POST or PUT operations needs a dedicated {Construct}Payload schema in api.yml:

• Contains only client-settable fields - never created_at, updated_at, deleted_at
• id is optional with json:"id,omitempty" for upsert patterns; absent entirely for create-only
• Referenced by all requestBody entries for POST/PUT

# In api.yml - components/schemas
KeychainPayload:
  type: object
  description: Payload for creating or updating a keychain.
  required:
    - name
  properties:
    id:
      $ref: ../../v1alpha1/core/api.yml#/components/schemas/uuid
      description: Existing keychain ID for updates; omit on create.
      x-oapi-codegen-extra-tags:
        json: "id,omitempty"
    name:
      type: string
    owner:
      $ref: ../../v1alpha1/core/api.yml#/components/schemas/uuid
      x-oapi-codegen-extra-tags:
        json: "owner,omitempty"

Rule 3 - POST/PUT requestBody must reference *Payload, not the entity schema

# WRONG - exposes server-generated required fields to clients
post:
  requestBody:
    content:
      application/json:
        schema:
          $ref: "#/components/schemas/Keychain"

# CORRECT - payload for write, full entity for response
post:
  requestBody:
    content:
      application/json:
        schema:
          $ref: "#/components/schemas/KeychainPayload"
  responses:
    "200":
      content:
        application/json:
          schema:
            $ref: "#/components/schemas/Keychain"

Canonical reference implementations

Construct	Entity schema	Payload schema
connection	connection.yaml	ConnectionPayload in api.yml
key	key.yaml	KeyPayload in api.yml
team	team.yaml	teamPayload + teamUpdatePayload in api.yml
environment	environment.yaml	environmentPayload in api.yml

Run make validate-schemas to catch dual-schema violations automatically.

---

SQL Driver (Scan/Value) Rules for Manual Helper Files

When writing sql.Scanner / driver.Valuer implementations in manual *_helper.go files:

Value() - always serialize, never return SQL NULL

The established pattern (core.Map) always marshals. A nil map produces JSON "null" - not SQL NULL. All implementations must match this.

// CORRECT - matches core.Map; nil → JSON "null", never SQL NULL
func (m MapObject) Value() (driver.Value, error) {
    b, err := json.Marshal(m)
    if err != nil {
        return nil, err
    }
    return string(b), nil
}

// WRONG - writes SQL NULL; inconsistent with core.Map
func (m MapObject) Value() (driver.Value, error) {
    if m == nil {
        return nil, nil   // ← never do this
    }
    ...
}

Scan() - zero the receiver when src is nil

// CORRECT - prevents stale data when struct is reused across rows
case nil:
    *m = nil
    return nil

// WRONG - leaves stale data from previous row
case nil:
    return nil

Note: x-generate-db-helpers-generated helpers in zz_generated.helpers.go already follow both rules correctly. These rules apply only to manually written helper files.

---

allOf decision rule

Use allOf only when one of these is true:

1. You are composing or extending an object schema with additional properties or requirements.
2. You are defining a reusable named schema component that wraps a referenced schema and the wrapper itself must carry its own description or x-* vendor extensions.
3. You are preserving an established generator-compatibility case where PR #629 proved that array item refs must stay wrapped to preserve generated cross-package types. Today that exception is limited to the design schema's components.items and relationships.items entries.

Do not add a single-entry allOf around ordinary object properties just to reference another schema. For normal properties, keep the direct $ref and put description, x-go-type, x-go-name, and x-oapi-codegen-extra-tags on the property itself.

Use this direct property pattern by default:

plan:
  $ref: "../plan/api.yml#/components/schemas/Plan"
  x-go-type: "planv1beta1.Plan"
  x-go-type-import:
    path: "github.com/meshery/schemas/models/v1beta1/plan"
    name: planv1beta1
  x-oapi-codegen-extra-tags:
    json: "plan,omitempty"

Use a single-entry wrapper only for reusable alias components that need local metadata:

AcademyCurriculaBadgeId:
  allOf:
    - $ref: "../../v1alpha1/core/api.yml#/components/schemas/uuid"
  description: ID of the badge awarded on completion of the curricula
  x-oapi-codegen-extra-tags:
    db: "badge_id"
    json: "badge_id"
    yaml: "badge_id"

Pagination response

Every list endpoint should return a paginated wrapper:

<Construct>Page:
  type: object
  properties:
    page:
      type: integer
    data:
      type: array
      items:
        $ref: '#/components/schemas/<Construct>'
    totalCount:
      type: integer
    pageSize:
      type: integer

Nullable time fields

deletedAt:
  x-go-type: "core.NullTime"
  $ref: "../../v1alpha1/core/api.yml#/components/schemas/deleted_at"
  x-oapi-codegen-extra-tags:
    db: "deleted_at"

Cross-construct references

When referencing types from another construct, use both $ref and Go type hints so the generated code imports correctly:

Invitation:
  $ref: "../invitation/api.yml#/components/schemas/Invitation"
  x-go-type: "invitationv1beta1.Invitation"
  x-go-type-import:
    path: "github.com/meshery/schemas/models/v1beta1/invitation"
    name: invitationv1beta1

Always set x-go-type-import.name when x-go-type uses an alias prefix. PR #629 updated the Go generator to preserve explicit aliases, so the alias in x-go-type and the alias in x-go-type-import.name must match.

Custom Go types for complex fields

metadata:
  type: object
  additionalProperties: true
  x-go-type: "core.Map"
  x-go-type-skip-optional-pointer: true
  x-oapi-codegen-extra-tags:
    db: "metadata"

Generated helper policy

Keep helper generation implicit whenever possible.

• EventCategory helpers should come from package/type conventions, not from a central handwritten package list.
• Scan and Value helpers should be inferred from generated Go structs and DB-tagged local struct usage.
• If a helper is not safely inferable, keep only that narrow exception handwritten in the package helper file and explain the exception in code or docs.
• Do not introduce new hand-maintained generator manifests for package/type-level helper behavior unless the schema and generated type information genuinely cannot express the rule.

x-generate-db-helpers - explicit JSON-blob helper generation

x-generate-db-helpers: true is a schema-level OpenAPI vendor extension (declared on a named schema component, not on individual properties). It explicitly instructs the Go generator to produce Scan() and Value() SQL driver methods for that type in zz_generated.helpers.go.

Use it when both of the following are true:

1. The type has a dedicated OpenAPI schema component with well-defined, named properties.
2. The type is persisted as a JSON blob in a single database column - not in a dedicated table with one column per property.

Do not use it for amorphous objects with no fixed property set (e.g., a freeform metadata field). Those should use x-go-type: "core.Map" instead. Do not use it for types that correspond to a proper relational table.

# ✅ Correct: dedicated schema, stored as a JSON blob in one DB column
Quiz:
  x-generate-db-helpers: true
  type: object
  properties:
    id:
      $ref: "../../v1alpha1/core/api.yml#/components/schemas/uuid"
    title:
      type: string

# ❌ Wrong: amorphous map - use x-go-type: "core.Map" instead
metadata:
  type: object
  additionalProperties: true
  x-go-type: "core.Map"
  x-go-type-skip-optional-pointer: true
  x-oapi-codegen-extra-tags:
    db: "metadata"

The annotation feeds into build/lib/generated-go-helpers.js via collectSchemaAnnotatedDbHelperTypes(), which merges annotated types with types already inferred from DB-tagged struct fields. The resulting Scan/Value pair enables the type to round-trip as JSON through any database/sql-compatible driver.

String arrays (pq.StringArray for PostgreSQL)

roleNames:
  type: array
  items:
    type: string
  x-go-type: "pq.StringArray"
  x-go-type-import:
    path: "github.com/lib/pq"

Internal API marking

Use x-internal to scope endpoints to specific deployments:

x-internal: ["cloud"]    # Cloud-only endpoint
x-internal: ["meshery"]  # Meshery OSS-only endpoint

The build pipeline uses these tags to produce separate merged specs (cloud_openapi.yml vs meshery_openapi.yml).

Creating a new schema

Step 1: Create the construct directory

mkdir -p schemas/constructs/v1beta1/<construct>/templates

Step 2: Write the subschema (<construct>.yaml)

Map each field to its OpenAPI type. Include x-oapi-codegen-extra-tags for fields that need custom Go struct tags (json, yaml, db, gorm):

type: object
properties:
  id:
    $ref: "../../v1alpha1/core/api.yml#/components/schemas/uuid"
    x-oapi-codegen-extra-tags:
      json: "id,omitempty"
      yaml: "id,omitempty"
      db: "id"
  name:
    type: string
    description: Human-readable name
    x-oapi-codegen-extra-tags:
      json: "name,omitempty"
      yaml: "name,omitempty"
      db: "name"
  created_at:
    $ref: ../../v1alpha1/core/api.yml#/components/schemas/created_at
    x-order: 14
  updated_at:
    $ref: ../../v1alpha1/core/api.yml#/components/schemas/updated_at
    x-order: 15

Step 3: Write the API index (api.yml)

openapi: 3.0.0
info:
  title: <Construct> API
  version: v1beta1

paths:
  /api/<constructs>:
    get:
      operationId: getAll<Constructs>
      # ... parameters, responses
    post:
      operationId: create<Construct>
      # ... requestBody, responses

components:
  schemas:
    <Construct>:
      $ref: './<construct>.yaml'
    <Construct>Page:
      # ... pagination wrapper

Step 4: Create template files

Templates provide default values for programmatic creation:

{
  "id": "00000000-0000-0000-0000-000000000000",
  "name": "",
  "created_at": "0001-01-01T00:00:00Z",
  "updated_at": "0001-01-01T00:00:00Z"
}

Step 5: Build and verify

make build          # Bundles schemas and generates all code
go test ./...       # Run Go tests
npm run build       # Build TypeScript package

Only commit the schema YAML files and template files. The generated code is produced by CI.

Auditing schemas for consistency

When reviewing or auditing schemas, check every item on this list:

HTTP API audit

• All operationId values are lower camelCase verbNoun (not GetPatterns, not get_patterns)
• Path parameters are camelCase with Id suffix ({workspaceId}, not {workspaceID}, not {workspace_id})
• No DELETE operation has a requestBody - bulk deletes use POST .../delete
• POST endpoints that exclusively create a new resource return 201, not 200
• DELETE endpoints with no response body return 204
• Long-running async operations return 202

Naming audit

• All non-DB-mirrored property names are camelCase (DB-mirrored fields like created_at, updated_at, user_id are explicit exceptions)
• Identifier fields end with "Id" suffix (e.g., modelId not model_id or modelID)
• New enum values are lowercase; existing published enum values are left as-is unless you are versioning the API
• Schema component names under components/schemas are PascalCase
• API paths use kebab-case with plural nouns under /api
• Path parameters are camelCase with Id suffix
• operationId values follow lower camelCase VerbNoun pattern

Reference audit

• No references to deprecated core.json - all use v1alpha1/core/api.yml
• Timestamps use $ref to core schemas (not inline type definitions)
• UUIDs use $ref to core uuid schema
• No redundant x-oapi-codegen-extra-tags on fields that already have them in the referenced schema
• Cross-construct refs include x-go-type and x-go-type-import for proper Go imports
• Alias-prefixed x-go-type values have a matching x-go-type-import.name

Structure audit

• Every construct directory has an api.yml index file
• Subschemas are referenced from api.yml via $ref
• Template files exist in templates/ subdirectory with sensible defaults
• openapi: 3.0.0 version is declared (not 3.1.0 - oapi-codegen requires 3.0.x)
• Each construct defines info.title and info.version
• Single-entry allOf wrappers are limited to reusable alias schemas or documented compatibility exceptions; ordinary property refs stay direct

Consistency across constructs

• Pagination responses follow the standard <Construct>Page pattern
• Similar fields across constructs use the same types (don't define status as string in one and enum in another without reason)
• x-internal tags are applied consistently for cloud vs meshery endpoints
• x-order values don't collide within the same schema

Code generation readiness

• Schema will produce clean Go structs (check for ambiguous oneOf/anyOf that create unwieldy union types)
• Fields that store JSON blobs in the database use x-go-type: "core.Map" with x-go-type-skip-optional-pointer: true
• Array fields backed by PostgreSQL use x-go-type: "pq.StringArray" where appropriate
• Nullable database fields use proper nullable markers
• New generator behavior is inferred from schema/type conventions rather than a hand-maintained package manifest unless there is a documented exception
• Schema components that are stored as JSON blobs in a DB column AND have a dedicated schema definition carry x-generate-db-helpers: true at the schema level (not on individual properties)
• Amorphous JSON blob fields (no fixed schema) use x-go-type: "core.Map" rather than x-generate-db-helpers

What NOT to do

These are the most common mistakes. If you catch yourself doing any of them, stop:

1. Committing generated code - files in models/, typescript/generated/, dist/, or _openapi_build/ are auto-generated. Only commit schema YAML and template files.
2. Using deprecated core.json references - always use v1alpha1/core/api.yml.
3. Defining timestamps inline - use $ref to core schema timestamps.
4. Adding redundant extra tags - if the $ref target already has x-oapi-codegen-extra-tags, don't duplicate them.
5. Using OpenAPI 3.1.0 - the code generators require 3.0.x.
6. Placing templates outside templates/ - they belong in the templates/ subdirectory.
7. Using .d.ts extension in TypeScript imports - use extensionless paths.
8. Forgetting to update typescript/index.ts - when adding a new construct, add the import and type export to this manually-maintained file.

Validation commands

# Run schema design validator (enforces all naming/casing/design rules)
go run ./cmd/validate-schemas              # fails on violations
go run ./cmd/validate-schemas --warn       # reports only
make validate-schemas                      # same via Makefile

# Full build (validates + generates everything - validator is step 1)
make build

# Run Go tests (including validation tests)
go test ./...

# Run TypeScript build
npm run build

# See all available make targets
make

What the validator enforces

The validator (validation/ Go package, using kin-openapi for spec parsing) checks 41 rules covering every naming convention, structural requirement, code-generation annotation, template accuracy, and API design principle. By default, blocking violations fail the build (exit 1). Use --warn to report advisories without failing (exit 0). Deprecated constructs (x-deprecated: true) are skipped entirely.

Naming rules (1-11):

• additionalProperties: false on entity schemas
• Server-generated fields excluded from requestBody required
• operationId lower camelCase verbNoun; Id not ID
• Path parameter camelCase with Id suffix
• No DELETE with requestBody
• Schema property names camelCase (snake_case only for DB-mirrored allowlist); Id not ID
• components/schemas names PascalCase
• New enum values lowercase; existing published enum values exempt
• Query/header parameter names camelCase
• Path segments kebab-case
• x-generate-db-helpers at schema component level only

Structural and annotation rules (12-22):

• openapi: 3.0.x required (not 3.1.0 - oapi-codegen requirement)
• info.title and info.version required in every api.yml
• x-internal is required on every operation and must be ["cloud"], ["meshery"], or ["cloud", "meshery"] (lowercase, array form)
• Cross-construct $ref must have x-go-type + x-go-type-import for Go imports
• Alias prefix in x-go-type must match x-go-type-import.name
• x-go-type: "core.Map" must pair with x-go-type-skip-optional-pointer: true
• Template files must exist in templates/ subdirectory
• No unnecessary single-entry allOf wrappers on plain property refs
• Entity .yaml must have both properties and required sections
• GET responses must not reference *Payload schemas
• Manual *_helper.go files must contain "not autogenerated" marker

API design rules (23-30):

• Every operation defines standard error responses (401, 500; 400 for writes; 404 for parameterized paths)
• api.yml with operations declares components/securitySchemes and applies valid security requirements
• List endpoints (GET returning arrays/paged responses) reference standard pagination parameters (page, pagesize)
• Inline schemas with 4+ properties should be extracted to components/schemas
• x-oapi-codegen-extra-tags: db: values are snake_case; json: matches property name; no manual yaml: tags
• HTTP response codes match method semantics (201 for create POST, 204 for single-resource DELETE)
• Duplicate schema structures across constructs detected (should use $ref)
• Success response schemas with inline array items (3+ properties) should use $ref

Additional rules (31-34):

• Response descriptions must not include the word "successfully"
• DB-backed property names must exactly match snake_case db tags (also checks gorm: column: tags)
• Pagination envelopes must use page_size and total_count (not pageSize/totalCount)
• Template file values must match schema property types (Rule 34: catches {} where schema says string/array)

DB-mirrored allowlist: created_at, updated_at, deleted_at, user_id, org_id, organization_id, environment_id, workspace_id, team_id, design_id, credential_id, connection_id, system_id, operation_id, view_id, general_id, invite_id, content_id, badge_id, plan_id, access_expires_at, avatar_url, accepted_terms_at. Only these may use snake_case.

Related resources

• Agent guidelines: .claude/agents/code-contributor.md - detailed contributor rules
• Repository guidelines: AGENTS.md - complete checklist for schema changes
• Existing skill: .github/skills/create-openapi-schemas-from-golang-models/ - specialized workflow for creating schemas from Go models in layer5io/meshery-cloud
• Build scripts: build/ directory - the bundler and all code generators
• Core schemas: schemas/constructs/v1alpha1/core/api.yml - reusable building blocks
• Example constructs: schemas/constructs/v1beta1/model/, schemas/constructs/v1beta1/environment/ - well-established patterns to follow