create-openapi-overlay

Development

Use when you need to customize SDK generation without editing the source spec, or can't modify the original OpenAPI file

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Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/api/create-openapi-overlay/SKILL.md

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create-openapi-overlay

Overlays let you customize an OpenAPI spec for SDK generation without modifying the source.

Create Overlay Template

speakeasy overlay create -s <spec-path> -o <output-path>

When to Use Overlays

Overlays are great for:

Renaming operations (x-speakeasy-name-override)
Adding descriptions/summaries
Grouping operations (x-speakeasy-group)
Adding retry configuration
Marking endpoints as deprecated
Adding SDK-specific extensions
Fixing spec issues without modifying the source
Adding new endpoints or schemas
Making portable patches that work across spec versions

Overlays cannot easily handle:

Deduplication of schemas (requires structural analysis)

Example Overlay

overlay: 1.0.0
info:
  title: SDK Customizations
  version: 1.0.0
actions:
  - target: "$.paths['/users'].get"
    update:
      x-speakeasy-group: users
      x-speakeasy-name-override: list
  - target: "$.paths['/users'].post"
    update:
      x-speakeasy-group: users
      x-speakeasy-name-override: create
  - target: "$.paths['/users/{id}'].get"
    update:
      x-speakeasy-group: users
      x-speakeasy-name-override: get
  - target: "$.paths['/users/{id}'].delete"
    update:
      x-speakeasy-group: users
      x-speakeasy-name-override: delete
      deprecated: true

This produces: sdk.users.list(), sdk.users.create(), sdk.users.get(), sdk.users.delete()

JSONPath Targeting

Target	Selects
`$.paths['/users'].get`	GET /users operation
`$.paths['/users/{id}'].*`	All operations on /users/{id}
`$.components.schemas.User`	User schema
`$.info`	API info object