feat: Add executionModel serialization to api client

stainless-app[bot] · stainless-app[bot] · commit 460067e9adc7 · 2026-01-29T21:24:30.000Z
diff --git a/.stats.yml b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 8
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/browserbase%2Fstagehand-43e6dd4ce19381de488d296e9036fea15bfea9a6f946cf8ccf4e02aecc8fb765.yml
-openapi_spec_hash: f736e7a8acea0d73e1031c86ea803246
-config_hash: b375728ccf7d33287335852f4f59c293
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/browserbase%2Fstagehand-8fbb3fa8f3a37c1c7408de427fe125aadec49f705e8e30d191601a9b69c4cc41.yml
+openapi_spec_hash: 48b4dfac35a842d7fb0d228caf87544e
+config_hash: 242651c4871c2869ba3c2e3d337505b9
diff --git a/lib/stagehand/internal/stream.rb b/lib/stagehand/internal/stream.rb
@@ -23,7 +23,7 @@ class Stream
             next if consume
 
             case msg
-            in {data: String => data} if data.start_with?("{\"data\":{\"status\":\"finished\"")
+            in {data: String => data} if data.start_with?("finished")
               consume = true
               next
             in {data: String => data} if data.start_with?("error")
diff --git a/lib/stagehand/models/session_execute_params.rb b/lib/stagehand/models/session_execute_params.rb
@@ -60,6 +60,16 @@ class AgentConfig < Stagehand::Internal::Type::BaseModel
         #   @return [Boolean, nil]
         optional :cua, Stagehand::Internal::Type::Boolean
 
+        # @!attribute execution_model
+        #   Model configuration object or model name string (e.g., 'openai/gpt-5-nano') for
+        #   tool execution (observe/act calls within agent tools). If not specified,
+        #   inherits from the main model configuration.
+        #
+        #   @return [Stagehand::Models::ModelConfig, String, nil]
+        optional :execution_model,
+                 union: -> { Stagehand::SessionExecuteParams::AgentConfig::ExecutionModel },
+                 api_name: :executionModel
+
         # @!attribute mode
         #   Tool mode for the agent (dom, hybrid, cua). If set, overrides cua.
         #
@@ -84,12 +94,14 @@ class AgentConfig < Stagehand::Internal::Type::BaseModel
         #   @return [String, nil]
         optional :system_prompt, String, api_name: :systemPrompt
 
-        # @!method initialize(cua: nil, mode: nil, model: nil, provider: nil, system_prompt: nil)
+        # @!method initialize(cua: nil, execution_model: nil, mode: nil, model: nil, provider: nil, system_prompt: nil)
         #   Some parameter documentations has been truncated, see
         #   {Stagehand::Models::SessionExecuteParams::AgentConfig} for more details.
         #
         #   @param cua [Boolean] Deprecated. Use mode: 'cua' instead. If both are provided, mode takes precedence
         #
+        #   @param execution_model [Stagehand::Models::ModelConfig, String] Model configuration object or model name string (e.g., 'openai/gpt-5-nano') for
+        #
         #   @param mode [Symbol, Stagehand::Models::SessionExecuteParams::AgentConfig::Mode] Tool mode for the agent (dom, hybrid, cua). If set, overrides cua.
         #
         #   @param model [Stagehand::Models::ModelConfig, String] Model configuration object or model name string (e.g., 'openai/gpt-5-nano')
@@ -98,6 +110,22 @@ class AgentConfig < Stagehand::Internal::Type::BaseModel
         #
         #   @param system_prompt [String] Custom system prompt for the agent
 
+        # Model configuration object or model name string (e.g., 'openai/gpt-5-nano') for
+        # tool execution (observe/act calls within agent tools). If not specified,
+        # inherits from the main model configuration.
+        #
+        # @see Stagehand::Models::SessionExecuteParams::AgentConfig#execution_model
+        module ExecutionModel
+          extend Stagehand::Internal::Type::Union
+
+          variant -> { Stagehand::ModelConfig }
+
+          variant String
+
+          # @!method self.variants
+          #   @return [Array(Stagehand::Models::ModelConfig, String)]
+        end
+
         # Tool mode for the agent (dom, hybrid, cua). If set, overrides cua.
         #
         # @see Stagehand::Models::SessionExecuteParams::AgentConfig#mode
diff --git a/rbi/stagehand/models/session_execute_params.rbi b/rbi/stagehand/models/session_execute_params.rbi
@@ -117,6 +117,19 @@ module Stagehand
         sig { params(cua: T::Boolean).void }
         attr_writer :cua
 
+        # Model configuration object or model name string (e.g., 'openai/gpt-5-nano') for
+        # tool execution (observe/act calls within agent tools). If not specified,
+        # inherits from the main model configuration.
+        sig { returns(T.nilable(T.any(Stagehand::ModelConfig, String))) }
+        attr_reader :execution_model
+
+        sig do
+          params(
+            execution_model: T.any(Stagehand::ModelConfig::OrHash, String)
+          ).void
+        end
+        attr_writer :execution_model
+
         # Tool mode for the agent (dom, hybrid, cua). If set, overrides cua.
         sig do
           returns(
@@ -171,6 +184,7 @@ module Stagehand
         sig do
           params(
             cua: T::Boolean,
+            execution_model: T.any(Stagehand::ModelConfig::OrHash, String),
             mode: Stagehand::SessionExecuteParams::AgentConfig::Mode::OrSymbol,
             model: T.any(Stagehand::ModelConfig::OrHash, String),
             provider:
@@ -182,6 +196,10 @@ module Stagehand
           # Deprecated. Use mode: 'cua' instead. If both are provided, mode takes
           # precedence.
           cua: nil,
+          # Model configuration object or model name string (e.g., 'openai/gpt-5-nano') for
+          # tool execution (observe/act calls within agent tools). If not specified,
+          # inherits from the main model configuration.
+          execution_model: nil,
           # Tool mode for the agent (dom, hybrid, cua). If set, overrides cua.
           mode: nil,
           # Model configuration object or model name string (e.g., 'openai/gpt-5-nano')
@@ -197,6 +215,7 @@ module Stagehand
           override.returns(
             {
               cua: T::Boolean,
+              execution_model: T.any(Stagehand::ModelConfig, String),
               mode:
                 Stagehand::SessionExecuteParams::AgentConfig::Mode::OrSymbol,
               model: T.any(Stagehand::ModelConfig, String),
@@ -209,6 +228,25 @@ module Stagehand
         def to_hash
         end
 
+        # Model configuration object or model name string (e.g., 'openai/gpt-5-nano') for
+        # tool execution (observe/act calls within agent tools). If not specified,
+        # inherits from the main model configuration.
+        module ExecutionModel
+          extend Stagehand::Internal::Type::Union
+
+          Variants = T.type_alias { T.any(Stagehand::ModelConfig, String) }
+
+          sig do
+            override.returns(
+              T::Array[
+                Stagehand::SessionExecuteParams::AgentConfig::ExecutionModel::Variants
+              ]
+            )
+          end
+          def self.variants
+          end
+        end
+
         # Tool mode for the agent (dom, hybrid, cua). If set, overrides cua.
         module Mode
           extend Stagehand::Internal::Type::Enum
diff --git a/sig/stagehand/models/session_execute_params.rbs b/sig/stagehand/models/session_execute_params.rbs
@@ -51,6 +51,7 @@ module Stagehand
       type agent_config =
         {
           cua: bool,
+          execution_model: Stagehand::Models::SessionExecuteParams::AgentConfig::execution_model,
           mode: Stagehand::Models::SessionExecuteParams::AgentConfig::mode,
           model: Stagehand::Models::SessionExecuteParams::AgentConfig::model,
           provider: Stagehand::Models::SessionExecuteParams::AgentConfig::provider,
@@ -62,6 +63,12 @@ module Stagehand
 
         def cua=: (bool) -> bool
 
+        attr_reader execution_model: Stagehand::Models::SessionExecuteParams::AgentConfig::execution_model?
+
+        def execution_model=: (
+          Stagehand::Models::SessionExecuteParams::AgentConfig::execution_model
+        ) -> Stagehand::Models::SessionExecuteParams::AgentConfig::execution_model
+
         attr_reader mode: Stagehand::Models::SessionExecuteParams::AgentConfig::mode?
 
         def mode=: (
@@ -86,6 +93,7 @@ module Stagehand
 
         def initialize: (
           ?cua: bool,
+          ?execution_model: Stagehand::Models::SessionExecuteParams::AgentConfig::execution_model,
           ?mode: Stagehand::Models::SessionExecuteParams::AgentConfig::mode,
           ?model: Stagehand::Models::SessionExecuteParams::AgentConfig::model,
           ?provider: Stagehand::Models::SessionExecuteParams::AgentConfig::provider,
@@ -94,12 +102,21 @@ module Stagehand
 
         def to_hash: -> {
           cua: bool,
+          execution_model: Stagehand::Models::SessionExecuteParams::AgentConfig::execution_model,
           mode: Stagehand::Models::SessionExecuteParams::AgentConfig::mode,
           model: Stagehand::Models::SessionExecuteParams::AgentConfig::model,
           provider: Stagehand::Models::SessionExecuteParams::AgentConfig::provider,
           system_prompt: String
         }
 
+        type execution_model = Stagehand::ModelConfig | String
+
+        module ExecutionModel
+          extend Stagehand::Internal::Type::Union
+
+          def self?.variants: -> ::Array[Stagehand::Models::SessionExecuteParams::AgentConfig::execution_model]
+        end
+
         type mode = :dom | :hybrid | :cua
 
         module Mode
