Module: ActiveAgent::Providers::Anthropic::Transforms

Defined in:
lib/active_agent/providers/anthropic/transforms.rb

Overview

Transforms between convenient input formats and Anthropic API structures.

Provides bidirectional transformations:

  • Expand: shortcuts → API format (string → content blocks, consecutive messages → grouped)

  • Compress: API format → shortcuts (single content blocks → strings for efficiency)

Class Method Summary collapse

Class Method Details

.cleanup_serialized_request(hash, defaults, gem_object = nil) ⇒ Hash

Cleans up serialized request for API submission.

Removes response-only fields, applies content compression, removes provider-internal fields, and removes default values. Note: max_tokens is kept even if it matches default as Anthropic API requires it.

Parameters:

  • hash (Hash) —

    serialized request

  • defaults (Hash) —

    default values to remove

  • gem_object (Object) (defaults to: nil) —

    original gem object (unused but for consistency)

Returns:

  • (Hash) —

    cleaned request hash



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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 432

def cleanup_serialized_request(hash, defaults, gem_object = nil)
  # Remove response-only fields from messages
  if hash[:messages]
    hash[:messages].each do |msg|
      msg.delete(:id)
      msg.delete(:model)
      msg.delete(:stop_reason)
      msg.delete(:stop_sequence)
      msg.delete(:type)
      msg.delete(:usage)
    end
  end

  # Apply content compression for API efficiency
  compress_content(hash)

  # Remove provider-internal fields and empty arrays
  hash.delete(:stop_sequences) if hash[:stop_sequences] == []
  hash.delete(:mcp_servers) if hash[:mcp_servers] == []
  hash.delete(:tool_choice) if hash[:tool_choice].nil?  # Don't send null tool_choice

  # Remove default values (except max_tokens which is required by API)
  defaults.each do |key, value|
    next if key == :max_tokens  # Anthropic API requires max_tokens
    hash.delete(key) if hash[key] == value
  end

  hash
end

.compress_content(hash) ⇒ Hash

Converts single-element content arrays back to string shorthand.

Reduces payload size by reversing the expansion done by normalize methods.

Parameters:

  • hash (Hash)

Returns:

  • (Hash) 


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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 390

def compress_content(hash)
  return hash unless hash.is_a?(Hash)

  # Compress message content
  hash[:messages]&.each do |msg|
    compress_message_content!(msg)
  end

  # Compress system content
  if hash[:system].is_a?(Array)
    hash[:system] = compress_system_content(hash[:system])
  end

  hash
end

.compress_message_content!(msg) ⇒ void

This method returns an undefined value.

Converts single text block arrays to string shorthand.

‘[“text”, text: “hello”]` → `“hello”`

Parameters:

  • msg (Hash) —

    message with :content key



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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 412

def compress_message_content!(msg)
  content = msg[:content]
  return unless content.is_a?(Array)

  # Single text block → string shorthand
  if content.one? && content.first.is_a?(Hash) && content.first[:type] == "text"
    msg[:content] = content.first[:text]
  end
end

.gem_to_hash(gem_object) ⇒ Hash

Converts gem model object to hash via JSON round-trip.

This ensures proper nested serialization and symbolic keys.

Parameters:

  • gem_object (Object) —

    any object responding to .to_json

Returns:

  • (Hash) 


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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 21

def gem_to_hash(gem_object)
  JSON.parse(gem_object.to_json, symbolize_names: true)
end

.normalize_content(content) ⇒ Array<Hash>

Expands content shortcuts into structured content block arrays.

Handles multiple input formats:

  • String → ‘[“text”, text: “…”]`

  • Hash with multiple keys → separate blocks per content type

  • Array → normalized items

Parameters:

  • content (String, Array, Hash)

Returns:

  • (Array<Hash>) 


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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 254

def normalize_content(content)
  case content
  when String
    # String → array with single text block
    [ { type: "text", text: content } ]
  when Array
    # Normalize each item in the array
    content.flat_map { |item| normalize_content_item(item) }
  when Hash
    # Check if hash has multiple content keys (text, image, document)
    # If so, expand into separate content blocks
    hash = content.deep_symbolize_keys
    content_keys = [ :text, :image, :document ]
    found_keys = content_keys & hash.keys

    if found_keys.size > 1
      # Multiple content types - expand into array
      found_keys.flat_map { |key| normalize_content_item({ key => hash[key] }) }
    else
      # Single content item
      [ normalize_content_item(content) ]
    end
  when nil
    []
  else
    # Pass through other types (might be gem objects already)
    [ content ]
  end
end

.normalize_content_item(item) ⇒ Hash

Infers content block type from hash keys or converts string to text block.

Parameters:

  • item (String, Hash)

Returns:

  • (Hash) 


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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 288

def normalize_content_item(item)
  case item
  when String
    { type: "text", text: item }
  when Hash
    hash = item.deep_symbolize_keys

    # If type is specified, return as-is
    return hash if hash[:type]

    # Type inference based on keys
    if hash[:text]
      { type: "text" }.merge(hash)
    elsif hash[:image]
      # Normalize image source format
      source = normalize_source(hash[:image])
      { type: "image", source: source }.merge(hash.except(:image))
    elsif hash[:document]
      # Normalize document source format
      source = normalize_source(hash[:document])
      { type: "document", source: source }.merge(hash.except(:document))
    elsif hash[:tool_use_id]
      # Tool result content
      { type: "tool_result" }.merge(hash)
    elsif hash[:id] && hash[:name] && hash[:input]
      # Tool use content
      { type: "tool_use" }.merge(hash)
    else
      # Unknown format - return as-is and let gem validate
      hash
    end
  else
    # Pass through (might be gem object)
    item
  end
end

.normalize_mcp_servers(mcp_servers) ⇒ Array<Hash>

Normalizes MCP servers from common format to Anthropic format.

Common format:

{name: "stripe", url: "https://...", authorization: "token"}

Anthropic format:

{type: "url", name: "stripe", url: "https://...", authorization_token: "token"}

Parameters:

  • mcp_servers (Array<Hash>)

Returns:

  • (Array<Hash>) 


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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 78

def normalize_mcp_servers(mcp_servers)
  return mcp_servers unless mcp_servers.is_a?(Array)

  mcp_servers.map do |server|
    server_hash = server.is_a?(Hash) ? server.deep_symbolize_keys : server

    # If already in Anthropic native format (has type: "url"), return as-is
    # Check for absence of common format 'authorization' field OR presence of native 'authorization_token'
    if server_hash[:type] == "url" && (server_hash[:authorization_token] || !server_hash[:authorization])
      next server_hash
    end

    # Convert common format to Anthropic format
    result = {
      type: "url",
      name: server_hash[:name],
      url: server_hash[:url]
    }

    # Map 'authorization' to 'authorization_token'
    if server_hash[:authorization]
      result[:authorization_token] = server_hash[:authorization]
    elsif server_hash[:authorization_token]
      result[:authorization_token] = server_hash[:authorization_token]
    end

    result.compact
  end
end

.normalize_messages(messages) ⇒ Array<Hash>

Merges consecutive same-role messages into single messages with multiple content blocks.

Required by Anthropic API - consecutive messages with the same role must be combined.

Parameters:

  • messages (Array<Hash>)

Returns:

  • (Array<Hash>) 


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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 168

def normalize_messages(messages)
  return messages unless messages.is_a?(Array)

  grouped = []

  messages.each do |msg|
    msg_hash = msg.is_a?(Hash) ? msg.deep_symbolize_keys : { role: :user, content: msg }

    # Extract role
    role = msg_hash[:role]&.to_sym || :user

    # Determine content
    if msg_hash.key?(:content)
      # Has explicit content key
      content = normalize_content(msg_hash[:content])
    elsif msg_hash.key?(:role) && msg_hash.keys.size > 1
      # Has role + other keys (e.g., {role: "assistant", text: "..."})
      # Treat everything except :role as content
      content = normalize_content(msg_hash.except(:role))
    elsif !msg_hash.key?(:role)
      # No role or content - treat entire hash as content
      content = normalize_content(msg_hash)
    else
      # Only has role, no content
      content = []
    end

    if grouped.empty? || grouped.last[:role] != role
      grouped << { role: role, content: content }
    else
      # Merge content from consecutive same-role messages
      grouped.last[:content] += content
    end
  end

  grouped
end

.normalize_params(params) ⇒ Hash

Parameters:

  • params (Hash)

Returns:

  • (Hash) 


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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 27

def normalize_params(params)
  params = params.dup
  params[:messages] = normalize_messages(params[:messages]) if params[:messages]
  params[:system] = normalize_system(params[:system]) if params[:system]
  params[:tools] = normalize_tools(params[:tools]) if params[:tools]
  params[:tool_choice] = normalize_tool_choice(params[:tool_choice]) if params[:tool_choice]

  # Handle mcps parameter (common format) -> transforms to mcp_servers (provider format)
  if params[:mcps]
    params[:mcp_servers] = normalize_mcp_servers(params.delete(:mcps))
  elsif params[:mcp_servers]
    params[:mcp_servers] = normalize_mcp_servers(params[:mcp_servers])
  end

  params
end

.normalize_source(source) ⇒ Hash

Converts image/document source shortcuts to API structure.

Handles multiple formats:

  • Regular URL → ‘“url”, url: “…”`

  • Data URI → ‘“base64”, media_type: “…”, data: “…”`

  • Hash with base64 → ‘“base64”, media_type: “…”, data: “…”`

Parameters:

  • source (String, Hash)

Returns:

  • (Hash) 


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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 334

def normalize_source(source)
  case source
  when String
    # Check if it's a data URI (e.g., "data:image/png;base64,...")
    if source.start_with?("data:")
      parse_data_uri(source)
    else
      # Regular URL → wrap in url source type
      { type: "url", url: source }
    end
  when Hash
    hash = source.deep_symbolize_keys
    # Already has type → return as-is
    return hash if hash[:type]

    # Has base64 data → add type
    if hash[:data] && hash[:media_type]
      { type: "base64" }.merge(hash)
    else
      # Unknown format → return as-is
      hash
    end
  else
    source
  end
end

.normalize_system(system) ⇒ String, Array

Converts system content shortcuts to API format.

Handles string, hash, or array inputs. Strings pass through unchanged since Anthropic accepts both string and structured formats.

Parameters:

  • system (String, Array, Hash)

Returns:

  • (String, Array) 


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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 213

def normalize_system(system)
  case system
  when String
    # Keep strings as-is - Anthropic accepts both string and array
    system
  when Array
    # Normalize array of system blocks
    system.map { |block| normalize_system_block(block) }
  when Hash
    # Single hash becomes array with one block
    [ normalize_system_block(system) ]
  else
    system
  end
end

.normalize_system_block(block) ⇒ Hash

Parameters:

  • block (String, Hash)

Returns:

  • (Hash) 


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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 231

def normalize_system_block(block)
  case block
  when String
    { type: "text", text: block }
  when Hash
    hash = block.deep_symbolize_keys
    # Add type if missing and can be inferred
    hash[:type] ||= "text" if hash[:text]
    hash
  else
    block
  end
end

.normalize_tool_choice(tool_choice) ⇒ Object

Normalizes tool_choice from common format to Anthropic gem model objects.

The Anthropic gem expects tool_choice to be a model object (ToolChoiceAuto, ToolChoiceAny, ToolChoiceTool, etc.), not a plain hash.

Maps:

  • “required” → ToolChoiceAny (force tool use)

  • “auto” → ToolChoiceAuto (let model decide)

  • { name: “…” } → ToolChoiceTool with name

Parameters:

  • tool_choice (String, Hash, Object)

Returns:

  • (Object) —

    Anthropic gem model object



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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 120

def normalize_tool_choice(tool_choice)
  # If already a gem model object, return as-is
  return tool_choice if tool_choice.is_a?(::Anthropic::Models::ToolChoiceAuto) ||
                         tool_choice.is_a?(::Anthropic::Models::ToolChoiceAny) ||
                         tool_choice.is_a?(::Anthropic::Models::ToolChoiceTool) ||
                         tool_choice.is_a?(::Anthropic::Models::ToolChoiceNone)

  case tool_choice
  when "required"
    # Create ToolChoiceAny model for forcing tool use
    ::Anthropic::Models::ToolChoiceAny.new(type: :any)
  when "auto"
    # Create ToolChoiceAuto model for letting model decide
    ::Anthropic::Models::ToolChoiceAuto.new(type: :auto)
  when Hash
    choice_hash = tool_choice.deep_symbolize_keys

    # If has type field, create appropriate model
    if choice_hash[:type]
      case choice_hash[:type].to_sym
      when :any
        ::Anthropic::Models::ToolChoiceAny.new(**choice_hash)
      when :auto
        ::Anthropic::Models::ToolChoiceAuto.new(**choice_hash)
      when :tool
        ::Anthropic::Models::ToolChoiceTool.new(**choice_hash)
      when :none
        ::Anthropic::Models::ToolChoiceNone.new(**choice_hash)
      else
        choice_hash
      end
    # Convert { name: "..." } to ToolChoiceTool
    elsif choice_hash[:name]
      ::Anthropic::Models::ToolChoiceTool.new(type: :tool, name: choice_hash[:name])
    else
      choice_hash
    end
  else
    tool_choice
  end
end

.normalize_tools(tools) ⇒ Array<Hash>

Normalizes tools from common format to Anthropic format.

Accepts both ‘parameters` and `input_schema` keys, converting to Anthropic’s ‘input_schema`.

Parameters:

  • tools (Array<Hash>)

Returns:

  • (Array<Hash>) 


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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 50

def normalize_tools(tools)
  return tools unless tools.is_a?(Array)

  tools.map do |tool|
    tool_hash = tool.is_a?(Hash) ? tool.deep_symbolize_keys : tool

    # If already in Anthropic format (has input_schema), return as-is
    next tool_hash if tool_hash[:input_schema]

    # Convert common format with 'parameters' to Anthropic format with 'input_schema'
    if tool_hash[:parameters]
      tool_hash = tool_hash.dup
      tool_hash[:input_schema] = tool_hash.delete(:parameters)
    end

    tool_hash
  end
end

.parse_data_uri(data_uri) ⇒ Hash

Extracts media type and data from data URI.

Expected format: ‘data:[<media type>],<data>`

Parameters:

  • data_uri (String) —

    e.g., “data:image/png;base64,iVBORw0…”

Returns:

  • (Hash) —

    ‘“base64”, media_type: “…”, data: “…”`



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# File 'lib/active_agent/providers/anthropic/transforms.rb', line 367

def parse_data_uri(data_uri)
  # Extract media type and data from data URI
  # Format: data:[<media type>][;base64],<data>
  match = data_uri.match(%r{\Adata:([^;,]+)(?:;base64)?,(.+)\z})

  if match
    {
      type: "base64",
      media_type: match[1],
      data: match[2]
    }
  else
    # Invalid data URI - return as URL fallback
    { type: "url", url: data_uri }
  end
end