smithy-lang/smithy 1.72.0

Smithy CLI v1.72.0

on GitHub

1.72.0 (2026-07-01)

Features

• Optimized model loading by ~50% by fixing a path traversal bug, reducing JSON
  allocations, reducing ShapeID string allocations, improving ShapeId and Model
  blackboard caches, optimizing selectors based on relevance, and skipping
  construction of suppressed unr
• esolved-trait validation events.
  (#3176)
• Added a new metadata trait that allows model authors to declare types for
  metadata keys that will be automatically validated when building models.
  (#3078)
• Added an optional message property to waiter acceptors that allows
  extracting a human-readable message from the operation output via a JMESPath
  expression. The expression must resolve to a string or array of strings and is
  only valid on failure state acceptors.
  (#3151)
• Added a shapeClosures metadata key that allows users to define closures of
  shapes that are not necessarily rooted in a service shape. This is primarily
  motivated by the desire to code-generate types without service or client
  framing, but is left open enough to be used for other purposes.
  (#3148)
• Optimized selector parsing
  (#3175)
• Added a generateDataShapesOnly mode to CodegenDirector that generates only
  data shapes (skipping service, resource, and operation shapes).
  (#3156)
• Added validation to ensure every operation binds all required rules engine
  parameters, emitting a RuleSetParameter.Operation.RequiredMissing error.
  (#3153)
• Updated tags member names validation in input/output structures to allow "map"
  suffix variants. (#3129)
• Added SmithyBuildConfig#toModelAssembler and SmithyBuild#toProjectedModel
  APIs to load and project a model directly from a build config.
  (#3135)
• The smithy format CLI command now falls back to the sources defined in
  smithy-build.json when no positional arguments are provided, allowing it to
  be run with no arguments inside a configured Smithy project.
  (#3143)
• Added test cases for errors in AWS JSON protocols using different namespaces
  (#3157)
• Added a --check option to the smithy format command that fails when any
  file would be modified.
  (#3141)
• Added the ability to drive directed code generation from a metadata-defined
  shape closure instead of a service.
  (#3156)
• Optimized selectors (#3171)
• Improved model loading performance by replacing NodeMapper with direct Node
  API calls in rules-engine traits and eliminating unnecessary trait map copies
  during shape construction.
  (#3185)
• Added support for services to declare non-default operation names (e.g.,
  AddTagsToResource) for tagging operations at the service level in the
  tagEnabled trait. Tag API discovery and validation honor the override before
  falling back to default-named operations.
  (#3130)

Bug Fixes

• Fixed an exponential search space growth in
  MemberShouldReferenceResourceValidator
  (#3149)
• Fixed several formatter bugs that mishandled docs and comments around member
  value assignments and shape boundaries.
  (#3132)
• Adds a warning when using the private trait on a mixin member, clarifying that
  it does not prevent the member from being inherited or modified by inheritors.
  (#3139)
• Fixes a formatter bug where some trait/node values weren't spread across
  multiple lines (#3140)
• Adds a validation event for when a private resource shape is referenced
  outside of its namespace using the resource target elision syntax.
  (#3139)
• Added a new getter for generated union trait values with a covariant return
  type to address the issue of the old getters erasing value types. The old
  getters are still around by default, but are deprecated. They may be omitted
  entirely via a plugin setting.
  (#3196)
• Added missing EnumShape hasTrait override.
  (#3183)
• Fixed a bug where comments trailing unused imports were being improperly
  removed during formatting.
  (#3152)
• Fixed the AddedRequiredMember diff evaluator so that it no longer flags new
  members marked with the @clientOptional trait, which is the sanctioned way
  to add a @required member without breaking generated client code.
  (#3166)

Documentation

• Updated resource docs to recommend against using the literal id as a
  resource name, since it can cause confusion in child resources.
  (#3198)

Other

• Formatted all smithy source files and added a formatting task to ensure they
  stay up to date. (#3142)
• Upgraded maven-resolver to 2.x. This is a transparent change to smithy-cli
  users, including those who supply their own dependency resolver
  implementation. (#3194)