feat: generate actor-specific RBS dispatch types

Combine registered message names with application-declared signatures.
Keep strict checks opt-in and preserve dynamic Ruby dispatch and global
registry names. Verify actual consumer source and packaged tooling.

Closes #63

Author: cardmagic

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+- Add optional actor-specific RBS generation for staged schedule/transmit calls
+  and effect callback names. Reuse application-declared operation argument types
+  without changing Ruby dispatch, runtime validation, or global effect registries.
+
 ## 0.14.6 - 2026-09-12
 
 - Preserve committed turns when an Active Record after-commit callback raises.

docs/architecture.md

@@ -443,6 +443,10 @@ a dead letter.
 
 `emit` creates a staged effect:
 
+Typed applications can generate [actor-specific RBS signatures](development.md#actor-specific-dispatch-signatures)
+to check callback names and staged `schedule`/`transmit` calls without changing
+their Ruby syntax. Effect and commit-action registry names remain independent.
+
 ```ruby
 emit(
   :charge_payment,

docs/development.md

@@ -103,6 +103,96 @@ bundle exec rake rbs
 
 This follows the inline convention used by `cardmagic/classifier`.
 
+### Actor-specific dispatch signatures
+
+Typed applications can opt into `SolidObjects::ActorSignatures` to check ordinary
+`schedule`, `transmit`, and effect callback names inside actor methods. Add `rbs`
+and `steep` to the application's development dependencies. This tool is loaded
+explicitly and is not required by workers or ordinary Ruby applications.
+
+Declare application operation types first, including inherited operations and
+block-defined `message` operations. Inline RBS can generate this input, or keep
+handwritten declarations in a separate directory such as `sig/actors`:
+
+```rbs
+class ChatRun < SolidObjects::Actor
+  def recover_if_stuck: (generation: Integer) -> nil
+  def fail_turn: (effect_id: String, arguments: Hash[String, untyped], error: Hash[String, untyped]) -> nil
+  def start: () -> nil
+end
+```
+
+After loading the application's actor classes, generate a separate output file:
+
+```ruby
+require "solid_objects/actor_signatures"
+
+Rails.application.reloader.wrap do
+  signatures = SolidObjects::ActorSignatures.generate(
+    actors: [ChatRun],
+    signatures: [Rails.root.join("sig/actors").to_s]
+  )
+  FileUtils.mkdir_p(Rails.root.join("sig/generated"))
+  File.write(Rails.root.join("sig/generated/solid_objects.rbs"), signatures)
+end
+```
+
+Run that script with `bin/rails runner` during development or CI. Outside Rails,
+require the actor definitions and call `generate` directly. The generator returns
+a string and does not write files, execute actor operations, start workers, or run
+migrations. Rails boot follows the application's normal loading configuration;
+the explicit actor list resolves its autoloaded classes within the reloader boundary.
+Keep generated output out of the input signature paths, and regenerate after a
+message is renamed or removed. Output is deterministic; handwritten signatures
+remain separate.
+
+Load the gem and both application signature directories in `Steepfile`:
+
+```ruby
+target :actors do
+  library "solid_objects"
+  signature "sig/actors"
+  signature "sig/generated"
+  check "app/actors"
+  configure_code_diagnostics(Diagnostic::Ruby.strict)
+end
+```
+
+The usual Ruby code now passes Steep without a dispatcher cast:
+
+```ruby
+schedule(at: Time.now, key: "watchdog").recover_if_stuck(generation: 1)
+transmit.recover_if_stuck(generation: 1)
+emit :run_model, generation: 1, on_failure: :fail_turn
+```
+
+Misspelled operations/callbacks, queries, attributes, private methods, infrastructure
+methods, and incorrect keyword arguments fail the strict check. Both string and
+symbol callback literals work. Staging returns `nil` even when an operation's own
+return type differs. Effect and commit-action names remain global registry names;
+registry contract inference is separate work.
+
+Reflection supplies message names only. Values come from declared RBS signatures;
+missing signatures and positional/block arguments are rejected. Block-defined
+messages require explicit method declarations in RBS; annotate their block-local
+values separately when checking the block body. Generic actor classes currently
+require application-owned dispatcher signatures. The generator preserves method
+overloads and method type parameters.
+
+Deliberately dynamic names can use Ruby's explicit dynamic dispatch:
+
+```ruby
+schedule(at: Time.now).public_send(operation_name, generation: generation)
+public_send(:emit, :run_model, on_failure: callback_name, generation: generation)
+```
+
+Those calls opt out of name/argument checking and retain the existing runtime
+validation. Ordinary calls on the generated dispatcher have no string-name fallback.
+`send_to`, `Reference#async`, direct calls, and queries retain their existing
+signatures and runtime behavior; this generator does not provide complete reference
+typing or Sorbet/Tapioca actor-specific RBI generation. The corresponding TypeScript
+work is tracked in [solid-objects-js#46](https://github.com/cardmagic/solid-objects-js/issues/46).
+
 ## Formatting and security
 
 ```bash

docs/operations.md

@@ -69,6 +69,12 @@ Rails schema migrations and actor state migrations are separate concerns.
 
 ### Host application tooling
 
+RBS/Steep applications can generate
+[actor-specific dispatch signatures](development.md#actor-specific-dispatch-signatures)
+for reminders, transmit calls, and effect callback names. This is optional development
+tooling; generated signatures do not change runtime dispatch. The generator does
+not supply equivalent Sorbet/Tapioca actor-specific types.
+
 Installed engine migrations are copied as
 `db/migrate/*_create_solid_objects_tables.solid_objects.rb`. If the host enables
 `Rails/CreateTableWithTimestamps`, exclude engine-owned migrations rather than

docs/reminders.md

@@ -39,6 +39,10 @@ raises, and nothing is logged except a `solid_objects.reminder.replaced` event.
 
 ## An alarm per item, with `key:`
 
+For static checking of watchdog operation names and keyword arguments, opt into
+[actor-specific RBS signatures](development.md#actor-specific-dispatch-signatures).
+The Ruby `schedule(...).recover_if_stuck(generation: ...)` syntax stays the same.
+
 Pass `key:` when an actor is waiting on several things at once. The key is your
 own identifier for the item, and it names that item's alarm, so each item gets
 one:

docs/roadmap.md

@@ -65,6 +65,10 @@
   gem's dependencies
 - Inline RBS generation/validation, Steep, Standard Ruby, Solid Queue's exact
   RuboCop policy, and a warning-free Brakeman scan
+- Opt-in actor-specific RBS generation for schedule/transmit keyword arguments
+  and effect callback names, using application declarations and checked consumer
+  fixtures. Dynamic names remain an explicit escape hatch; complete reference
+  typing and actor-specific RBI generation are separate work
 - Compatibility CI across the supported span: Ruby 3.3, 3.4, and 4.0 against
   Rails 7.1, 7.2, 8.0, and 8.1, pinned through `RAILS_VERSION` so the advertised
   range is verified rather than assumed. The compatibility job runs SQLite only;

lib/solid_objects/actor_signatures.rb

@@ -0,0 +1,80 @@
+# rbs_inline: enabled
+
+require "solid_objects"
+require "rbs"
+require "pathname"
+
+module SolidObjects
+  class ActorSignatures
+    # @rbs (actors: Array[Class], signatures: Array[String]) -> String
+    def self.generate(actors:, signatures:)
+      new(signatures:).generate(actors:)
+    end
+
+    # @rbs @builder: untyped
+
+    # @rbs (signatures: Array[String]) -> void
+    def initialize(signatures:)
+      loader = RBS::EnvironmentLoader.new
+      loader.add(path: Pathname.new(File.expand_path("../../sig", __dir__)))
+      signatures.sort.each { |path| loader.add(path: Pathname.new(path)) }
+      environment = RBS::Environment.from_loader(loader).resolve_type_names
+      @builder = RBS::DefinitionBuilder.new(env: environment)
+    end
+
+    # @rbs (actors: Array[Class]) -> String
+    def generate(actors:)
+      actors.uniq.sort_by { |actor| actor.name.to_s }.map { |actor| actor_signature(actor) }.join("\n")
+    end
+
+    private
+
+    # @rbs (untyped) -> String
+    def actor_signature(actor)
+      unless actor < Actor && actor.name
+        raise ArgumentError, "actor signatures require named SolidObjects::Actor subclasses"
+      end
+
+      name = RBS::TypeName.parse("::#{actor.name}")
+      definition = @builder.build_instance(name)
+      if definition.type_params.any?
+        raise ArgumentError, "generic actor classes require application-owned dispatcher signatures"
+      end
+      messages = actor.definition.messages.keys.sort
+      methods = messages.map do |operation|
+        method = definition.methods[operation]
+        unless method && method.accessibility == :public
+          raise ArgumentError, "declare a public RBS signature for #{actor.name}##{operation}"
+        end
+        types = method.method_types.map { |type| staged_type(type, actor.name, operation).to_s }
+        "    def #{operation}: #{types.join("\n      | ")}"
+      end
+      callback_names = messages.flat_map { |operation| [ operation.inspect, operation.to_s.inspect ] }
+      callbacks = (callback_names + [ "nil" ]).join(" | ")
+      <<~RBS
+        class #{name}
+          interface _SolidObjectsOperations
+        #{methods.join("\n")}
+            def public_send: (Symbol | String, **untyped) -> nil
+          end
+
+          def schedule: (at: Time, ?every: Numeric?, ?missed: Symbol | String, ?key: (String | Symbol | Integer)?) -> #{name}::_SolidObjectsOperations
+          def transmit: () -> #{name}::_SolidObjectsOperations
+          def emit: (Symbol | String, ?on_success: (#{callbacks}), ?on_failure: (#{callbacks}), **untyped) -> nil
+        end
+      RBS
+    end
+
+    # @rbs (untyped, String, Symbol) -> untyped
+    def staged_type(method_type, actor_name, operation)
+      function = method_type.type
+      if !function.is_a?(RBS::Types::Function) || method_type.block ||
+          function.required_positionals.any? || function.optional_positionals.any? ||
+          function.rest_positionals || function.trailing_positionals.any?
+        raise ArgumentError, "#{actor_name}##{operation} must declare keyword-only arguments without a block"
+      end
+
+      method_type.update(type: function.update(return_type: RBS::Types::Bases::Nil.new(location: nil)))
+    end
+  end
+end

sig/generated/lib/solid_objects/actor_signatures.rbs

@@ -0,0 +1,24 @@
+# Generated from lib/solid_objects/actor_signatures.rb with RBS::Inline
+
+module SolidObjects
+  class ActorSignatures
+    # @rbs (actors: Array[Class], signatures: Array[String]) -> String
+    def self.generate: (actors: Array[Class], signatures: Array[String]) -> String
+
+    @builder: untyped
+
+    # @rbs (signatures: Array[String]) -> void
+    def initialize: (signatures: Array[String]) -> void
+
+    # @rbs (actors: Array[Class]) -> String
+    def generate: (actors: Array[Class]) -> String
+
+    private
+
+    # @rbs (untyped) -> String
+    def actor_signature: (untyped) -> String
+
+    # @rbs (untyped, String, Symbol) -> untyped
+    def staged_type: (untyped, String, Symbol) -> untyped
+  end
+end