Module: AgentHarness::Providers::Adapter

Included in:
Base
Defined in:
lib/agent_harness/providers/adapter.rb

Overview

Interface that all providers must implement

This module defines the contract that provider implementations must follow. Include this module in provider classes to ensure they implement the required interface.

Examples:

Implementing a provider

class MyProvider < AgentHarness::Providers::Base
  include AgentHarness::Providers::Adapter

  def self.provider_name
    :my_provider
  end
end

Defined Under Namespace

Modules: ClassMethods

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/agent_harness/providers/adapter.rb', line 19

def self.included(base)
  base.extend(ClassMethods)
end

Instance Method Details

#auth_type ⇒ Symbol

Authentication type for this provider

Returns:

  • (Symbol) —

    :oauth for token-based auth that can expire, :api_key for static API key auth



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# File 'lib/agent_harness/providers/adapter.rb', line 184

def auth_type
  :api_key
end

#build_mcp_flags(mcp_servers, working_dir: nil) ⇒ Array<String>

Build provider-specific MCP flags/arguments for CLI invocation

Parameters:

  • mcp_servers (Array<McpServer>) —

    MCP server definitions

  • working_dir (String, nil) (defaults to: nil) —

    working directory for temp files

Returns:

  • (Array<String>) —

    CLI flags to append to the command



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# File 'lib/agent_harness/providers/adapter.rb', line 214

def build_mcp_flags(mcp_servers, working_dir: nil)
  []
end

#capabilities ⇒ Hash

Provider capabilities

Returns:

  • (Hash) —

    capability flags



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# File 'lib/agent_harness/providers/adapter.rb', line 161

def capabilities
  {
    streaming: false,
    file_upload: false,
    vision: false,
    tool_use: false,
    json_mode: false,
    mcp: false,
    dangerous_mode: false
  }
end

#configuration_schema ⇒ Hash

Provider configuration schema for app-driven setup UIs

Returns metadata describing the configurable fields, supported authentication modes, and backend compatibility for this provider. Applications use this to build generic provider-entry forms without hardcoding provider-specific knowledge.

Returns:

  • (Hash) —

    with :fields, :auth_modes, :openai_compatible keys



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# File 'lib/agent_harness/providers/adapter.rb', line 150

def configuration_schema
  {
    fields: [],
    auth_modes: [auth_type],
    openai_compatible: false
  }
end

#dangerous_mode_flags ⇒ Array<String>

Get dangerous mode flags

Returns:

  • (Array<String>) —

    CLI flags for dangerous mode



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# File 'lib/agent_harness/providers/adapter.rb', line 264

def dangerous_mode_flags
  []
end

#error_patterns ⇒ Hash<Symbol, Array<Regexp>>

Error patterns for classification

Returns:

  • (Hash<Symbol, Array<Regexp>>) —

    error patterns by category



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# File 'lib/agent_harness/providers/adapter.rb', line 176

def error_patterns
  {}
end

#execution_semantics ⇒ Hash

Execution semantics for this provider

Returns a hash describing provider-specific execution behavior so downstream apps do not need to hardcode CLI quirks. This metadata can be used to select the right flags and interpret output.

Returns:

  • (Hash) —

    execution semantics



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# File 'lib/agent_harness/providers/adapter.rb', line 369

def execution_semantics
  {
    prompt_delivery: :arg,       # :arg, :stdin, or :flag
    output_format: :text,        # :text or :json
    sandbox_aware: false,        # adjusts behavior inside containers
    uses_subcommand: false,      # e.g. "codex exec", "opencode run"
    non_interactive_flag: nil,   # flag to suppress interactive prompts
    legitimate_exit_codes: [0],  # exit codes that are NOT errors
    stderr_is_diagnostic: true,  # stderr may contain non-error output
    parses_rate_limit_reset: false # can extract Retry-After from output
  }
end

#fetch_mcp_servers ⇒ Array<Hash>

Fetch configured MCP servers

Returns:

  • (Array<Hash>) —

    MCP server configurations



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# File 'lib/agent_harness/providers/adapter.rb', line 198

def fetch_mcp_servers
  []
end

#health_status ⇒ Hash

Health check

Returns:

  • (Hash) —

    with :healthy, :message keys



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# File 'lib/agent_harness/providers/adapter.rb', line 293

def health_status
  {healthy: true, message: "OK"}
end

#parse_rate_limit_reset(output) ⇒ Time?

Parse a rate-limit reset time from provider output

Providers that include rate-limit reset information in their error output can override this to extract it, so the orchestration layer can schedule retries accurately.

Parameters:

  • output (String) —

    combined stdout+stderr from the CLI

Returns:

  • (Time, nil) —

    when the rate limit resets, or nil if unknown



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# File 'lib/agent_harness/providers/adapter.rb', line 390

def parse_rate_limit_reset(output)
  nil
end

#send_message(prompt:, **options) ⇒ Response

Send a message/prompt to the provider

Parameters:

  • prompt (String) —

    the prompt to send

  • options (Hash) —

    provider-specific options

Options Hash (**options):

  • :model (String) —

    model to use

  • :timeout (Integer) —

    timeout in seconds

  • :session (String) —

    session identifier

  • :dangerous_mode (Boolean) —

    skip permission checks

  • :provider_runtime (ProviderRuntime, Hash, nil) —

    per-request runtime overrides (model, base_url, api_provider, env, flags, metadata). For providers that delegate to Providers::Base#send_message, a plain Hash is automatically coerced into a ProviderRuntime. Providers that override #send_message directly are responsible for handling this option.

Returns:

  • (Response) —

    response object with output and metadata

Raises:

  • (NotImplementedError) 


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# File 'lib/agent_harness/providers/adapter.rb', line 138

def send_message(prompt:, **options)
  raise NotImplementedError, "#{self.class} must implement #send_message"
end

#session_flags(session_id) ⇒ Array<String>

Get session flags for continuation

Parameters:

  • session_id (String) —

    the session ID

Returns:

  • (Array<String>) —

    CLI flags for session continuation



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# File 'lib/agent_harness/providers/adapter.rb', line 279

def session_flags(session_id)
  []
end

#smoke_test(timeout: nil, provider_runtime: nil) ⇒ Hash

Execute a minimal provider-owned smoke test via the configured executor.

Parameters:

  • timeout (Integer, nil) (defaults to: nil) —

    timeout override in seconds

  • provider_runtime (ProviderRuntime, Hash, nil) (defaults to: nil) —

    runtime overrides

Returns:

  • (Hash) —

    normalized smoke-test result



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# File 'lib/agent_harness/providers/adapter.rb', line 309

def smoke_test(timeout: nil, provider_runtime: nil)
  contract = smoke_test_contract
  raise NotImplementedError, "#{self.class} does not implement #smoke_test_contract" unless contract

  prompt = contract[:prompt]
  if !prompt.is_a?(String) || prompt.strip.empty?
    raise ConfigurationError, "#{self.class}.smoke_test_contract must define a non-empty :prompt"
  end

  response = send_message(
    prompt: prompt,
    timeout: timeout || contract[:timeout],
    provider_runtime: provider_runtime
  )

  output = response.output.to_s.strip
  expected_output = contract[:expected_output]&.strip
  success = response.success? && (!contract.fetch(:require_output, true) || !output.empty?)
  success &&= expected_output.nil? || output == expected_output

  if success
    return {
      ok: true,
      status: "ok",
      message: contract[:success_message] || "Smoke test passed",
      error_category: nil,
      output: output,
      exit_code: response.exit_code
    }
  end

  message = response.error.to_s.strip
  message = output if message.empty?
  message = "Smoke test failed with exit code #{response.exit_code}" if message.empty?

  {
    ok: false,
    status: "error",
    message: message,
    error_category: classify_smoke_test_message(message),
    output: output,
    exit_code: response.exit_code
  }
rescue TimeoutError => e
  failure_smoke_test_result(e.message, :timeout)
rescue AuthenticationError => e
  failure_smoke_test_result(e.message, :auth_expired)
rescue RateLimitError => e
  failure_smoke_test_result(e.message, :rate_limited)
rescue ProviderError => e
  failure_smoke_test_result(e.message, classify_smoke_test_message(e.message))
end

#smoke_test_contract ⇒ Hash?

Canonical smoke-test contract for this provider instance.

Returns:

  • (Hash, nil) —

    smoke-test metadata



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# File 'lib/agent_harness/providers/adapter.rb', line 300

def smoke_test_contract
  self.class.smoke_test_contract if self.class.respond_to?(:smoke_test_contract)
end

#supported_mcp_transports ⇒ Array<String>

Supported MCP transport types for this provider

Returns:

  • (Array<String>) —

    supported transports (e.g. [“stdio”, “http”])



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# File 'lib/agent_harness/providers/adapter.rb', line 205

def supported_mcp_transports
  []
end

#supports_dangerous_mode? ⇒ Boolean

Check if provider supports dangerous mode

Returns:

  • (Boolean) —

    true if dangerous mode is supported



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# File 'lib/agent_harness/providers/adapter.rb', line 257

def supports_dangerous_mode?
  capabilities[:dangerous_mode]
end

#supports_mcp? ⇒ Boolean

Check if provider supports MCP

Returns:

  • (Boolean) —

    true if MCP is supported



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# File 'lib/agent_harness/providers/adapter.rb', line 191

def supports_mcp?
  capabilities[:mcp]
end

#supports_sessions? ⇒ Boolean

Check if provider supports session continuation

Returns:

  • (Boolean) —

    true if sessions are supported



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# File 'lib/agent_harness/providers/adapter.rb', line 271

def supports_sessions?
  false
end

#validate_config ⇒ Hash

Validate provider configuration

Returns:

  • (Hash) —

    with :valid, :errors keys



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# File 'lib/agent_harness/providers/adapter.rb', line 286

def validate_config
  {valid: true, errors: []}
end

#validate_mcp_servers!(mcp_servers) ⇒ Object

Validate that this provider can handle the given MCP servers

Parameters:

  • mcp_servers (Array<McpServer>) —

    MCP server definitions

Raises:



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# File 'lib/agent_harness/providers/adapter.rb', line 223

def validate_mcp_servers!(mcp_servers)
  return if mcp_servers.nil? || mcp_servers.empty?

  unless supports_mcp?
    raise McpUnsupportedError.new(
      "Provider '#{self.class.provider_name}' does not support MCP servers",
      provider: self.class.provider_name
    )
  end

  supported = supported_mcp_transports

  if supported.empty?
    raise McpUnsupportedError.new(
      "Provider '#{self.class.provider_name}' does not support request-time MCP servers",
      provider: self.class.provider_name
    )
  end

  mcp_servers.each do |server|
    next if supported.include?(server.transport)

    raise McpTransportUnsupportedError.new(
      "Provider '#{self.class.provider_name}' does not support MCP transport " \
      "'#{server.transport}' (server: '#{server.name}'). " \
      "Supported transports: #{supported.join(", ")}",
      provider: self.class.provider_name
    )
  end
end