Class: Clacky::AgentConfig

Inherits:
Object
  • Object
show all
Defined in:
lib/clacky/agent_config.rb

Constant Summary collapse

CONFIG_DIR = 
File.join(Dir.home, ".clacky")
CONFIG_FILE = 
File.join(CONFIG_DIR, "config.yml")
CLAUDE_DEFAULT_MODEL =

Default model for ClaudeCode environment

"claude-sonnet-4-5"
PERMISSION_MODES = 
[:auto_approve, :confirm_safes, :confirm_all].freeze
DEFAULT_COMPRESSION_THRESHOLD =

Conversation-history compression defaults. Both are user-configurable via ‘settings.compression_threshold` / `settings.message_count_threshold` in ~/.clacky/config.yml — local-model users (llama.cpp / ollama / vllm) typically lower compression_threshold to fit their server’s context window.

150_000
DEFAULT_MESSAGE_COUNT_THRESHOLD = 
200
RUNTIME_ONLY_FIELDS =

Convert to YAML format (top-level array) Auto-injected lite models (auto_injected: true) are excluded from persistence —they are regenerated at load time from the provider preset. Runtime-only fields (id, auto_injected) are stripped before writing so config.yml remains backward compatible with users on older versions.

%w[id auto_injected].freeze
CONFIG_SETTINGS_KEYS =

Settings keys that are persisted to config.yml. These map directly to AgentConfig accessors.

%w[
  enable_compression enable_prompt_caching
  compression_threshold message_count_threshold
  memory_update_enabled
  skill_evolution max_running_agents max_idle_agents
  default_working_dir
].freeze
FALLBACK_COOLING_OFF_SECONDS =

How long to stay on the fallback model before probing the primary again.

30 * 60

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ AgentConfig

Returns a new instance of AgentConfig.



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# File 'lib/clacky/agent_config.rb', line 169

def initialize(options = {})
  @permission_mode = validate_permission_mode(options[:permission_mode])
  @max_tokens = options[:max_tokens] || 16384
  @verbose = options[:verbose] || false
  @enable_compression = options[:enable_compression].nil? ? true : options[:enable_compression]
  # Enable prompt caching by default for cost savings
  @enable_prompt_caching = options[:enable_prompt_caching].nil? ? true : options[:enable_prompt_caching]
  # Token threshold that triggers proactive history compression. Local models
  # (llama.cpp, ollama, vllm) often have small context windows (e.g. 64k);
  # users with such setups should lower this to avoid hitting the server-side ceiling.
  @compression_threshold = options[:compression_threshold] || DEFAULT_COMPRESSION_THRESHOLD
  # Message-count threshold that also triggers compression, independent of token count.
  # Guards against pathological histories with many tiny messages.
  @message_count_threshold = options[:message_count_threshold] || DEFAULT_MESSAGE_COUNT_THRESHOLD

  # Models configuration
  @models = options[:models] || []
  # Ensure every model has a stable runtime id — this is the single
  # invariant the rest of the system relies on. Regardless of how the
  # config was built (load from yml, direct .new in tests, add_model,
  # api_save_config), every model in @models will have an id.
  @models.each { |m| m["id"] ||= SecureRandom.uuid }

  @current_model_index = options[:current_model_index] || 0
  # Stable runtime id for the currently-selected model. Preferred over
  # @current_model_index because ids are immune to list reordering,
  # additions, and edits to model fields. Ids are injected at load time
  # and never persisted to config.yml (backward compatible with old files).
  # If caller didn't specify current_model_id, prefer the model marked
  # as `type: default` (the documented convention), falling back to
  # models[current_model_index] only if no default marker exists.
  @current_model_id = options[:current_model_id] ||
                      (@models.find { |m| m["type"] == "default" } || @models[@current_model_index])&.dig("id")

  # Memory and skill evolution configuration
  @memory_update_enabled = options[:memory_update_enabled].nil? ? true : options[:memory_update_enabled]
  @skill_evolution = options[:skill_evolution] || {
    enabled: true,
    auto_create_threshold: 12,
    reflection_mode: "llm_analysis"
  }
  # Deep-symbolize keys — YAML-loaded hashes come with string keys,
  # but the rest of the codebase accesses with symbols.
  @skill_evolution = @skill_evolution.transform_keys(&:to_sym)
  @skill_evolution.transform_values! { |v| v.is_a?(Hash) ? v.transform_keys(&:to_sym) : v }

  @max_running_agents = options[:max_running_agents] || 10
  @max_idle_agents = options[:max_idle_agents] || 10

  @default_working_dir = options[:default_working_dir] || ENV["CLACKY_WORKSPACE_DIR"]

  # Per-session virtual model overlay.
  # When set, #current_model returns a *merged* hash (the resolved @models
  # entry merged with this overlay) without mutating the shared @models
  # array. Used by fork_subagent's virtual-lite path so a forked subagent
  # can run on different credentials (e.g. Haiku instead of Opus) without
  # polluting the parent agent's shared @models hashes.
  # Keys honored: "api_key", "base_url", "model", "anthropic_format".
  # @return [Hash, nil]
  @virtual_model_overlay = options[:virtual_model_overlay]

  # Per-session sub-model override. Persists across restarts via the
  # session file. Independent of @virtual_model_overlay (which is for
  # short-lived subagent forks). Used by the WebUI sub-model switcher
  # to pin a session to e.g. "dsk-deepseek-v4-pro" while the underlying
  # card still says "abs-claude-sonnet-4-6". Only the "model" key is
  # honored — sub-model switching never changes credentials.
  @session_model_overlay = options[:session_model_overlay]
end

Instance Attribute Details

#compression_threshold ⇒ Object

Returns the value of attribute compression_threshold.



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# File 'lib/clacky/agent_config.rb', line 161

def compression_threshold
  @compression_threshold
end

#current_model_id ⇒ Object

Returns the value of attribute current_model_id.



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# File 'lib/clacky/agent_config.rb', line 161

def current_model_id
  @current_model_id
end

#current_model_index ⇒ Object

Returns the value of attribute current_model_index.



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# File 'lib/clacky/agent_config.rb', line 161

def current_model_index
  @current_model_index
end

#default_working_dir ⇒ Object

Returns the value of attribute default_working_dir.



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# File 'lib/clacky/agent_config.rb', line 161

def default_working_dir
  @default_working_dir
end

#enable_compression ⇒ Object

Returns the value of attribute enable_compression.



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# File 'lib/clacky/agent_config.rb', line 161

def enable_compression
  @enable_compression
end

#enable_prompt_caching ⇒ Object

Returns the value of attribute enable_prompt_caching.



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# File 'lib/clacky/agent_config.rb', line 161

def enable_prompt_caching
  @enable_prompt_caching
end

#max_idle_agents ⇒ Object

Returns the value of attribute max_idle_agents.



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# File 'lib/clacky/agent_config.rb', line 161

def max_idle_agents
  @max_idle_agents
end

#max_running_agents ⇒ Object

Returns the value of attribute max_running_agents.



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# File 'lib/clacky/agent_config.rb', line 161

def max_running_agents
  @max_running_agents
end

#max_tokens ⇒ Object

Returns the value of attribute max_tokens.



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# File 'lib/clacky/agent_config.rb', line 161

def max_tokens
  @max_tokens
end

#memory_update_enabled ⇒ Object

Returns the value of attribute memory_update_enabled.



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# File 'lib/clacky/agent_config.rb', line 161

def memory_update_enabled
  @memory_update_enabled
end

#message_count_threshold ⇒ Object

Returns the value of attribute message_count_threshold.



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# File 'lib/clacky/agent_config.rb', line 161

def message_count_threshold
  @message_count_threshold
end

#models ⇒ Object

Returns the value of attribute models.



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# File 'lib/clacky/agent_config.rb', line 161

def models
  @models
end

#permission_mode ⇒ Object

Returns the value of attribute permission_mode.



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# File 'lib/clacky/agent_config.rb', line 161

def permission_mode
  @permission_mode
end

#skill_evolution ⇒ Object

Returns the value of attribute skill_evolution.



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# File 'lib/clacky/agent_config.rb', line 161

def skill_evolution
  @skill_evolution
end

#verbose ⇒ Object

Returns the value of attribute verbose.



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# File 'lib/clacky/agent_config.rb', line 161

def verbose
  @verbose
end

Class Method Details

.load(config_file = CONFIG_FILE) ⇒ Object

Load configuration from file



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# File 'lib/clacky/agent_config.rb', line 240

def self.load(config_file = CONFIG_FILE)
  # Load from config file first
  if File.exist?(config_file)
    data = YAML.load_file(config_file)
  else
    data = nil
  end

  # Extract settings from hash-format config (new format).
  # Old flat-array configs have no settings section — all defaults.
  loaded_settings = {}
  if data.is_a?(Hash) && data["settings"].is_a?(Hash)
    loaded_settings = data["settings"]
  end

  # Parse models from config
  models = parse_models(data)

  # Priority: config file > CLACKY_XXX env vars > ClaudeCode env vars
  if models.empty?
    # Try CLACKY_XXX environment variables first
    if ClackyEnv.default_configured?
      models << ClackyEnv.default_model_config
    # ClaudeCode (Anthropic) environment variable support is disabled
    # elsif ClaudeCodeEnv.configured?
    #   models << {
    #     "type" => "default",
    #     "api_key" => ClaudeCodeEnv.api_key,
    #     "base_url" => ClaudeCodeEnv.base_url,
    #     "model" => CLAUDE_DEFAULT_MODEL,
    #     "anthropic_format" => true
    #   }
    end

    # Add CLACKY_LITE_XXX if configured (only when loading from env)
    if ClackyEnv.lite_configured?
      models << ClackyEnv.lite_model_config
    end
  else
    # Config file exists, but check if we need to add env-based models
    # Only add if no model with that type exists
    has_default = models.any? { |m| m["type"] == "default" }
    has_lite = models.any? { |m| m["type"] == "lite" }

    # Add CLACKY default if not in config and env is set
    if !has_default && ClackyEnv.default_configured?
      models << ClackyEnv.default_model_config
    end

    # Add CLACKY lite if not in config and env is set
    if !has_lite && ClackyEnv.lite_configured?
      models << ClackyEnv.lite_model_config
    end

    # Ensure at least one model has type: default
    # If no model has type: default, assign it to the first model
    unless models.any? { |m| m["type"] == "default" }
      models.first["type"] = "default" if models.any?
    end
  end

  # Auto-inject lite model from provider preset is **no longer materialized
  # into @models**. Lite is now a virtual, on-demand view derived from the
  # currently-selected primary model — see `#lite_model_config_for_current`.
  # This keeps @models a clean "list of user-facing models" and lets the
  # lite companion track the current model at runtime, rather than being
  # frozen at load time to whichever model happened to be the default.
  #
  # Legacy note: prior versions injected an entry here with
  # `auto_injected: true`. That flag is still honored in to_yaml for
  # safety (never persisted), but new injections never happen.

  # Ensure every model has a stable runtime id — covers env-injected
  # models (CLACKY_XXX, CLAUDE_XXX) that don't go through parse_models.
  # Ids are NOT persisted to config.yml (see to_yaml).
  models.each { |m| m["id"] ||= SecureRandom.uuid }

  # Find the index of the model marked as "default" (type: default)
  # Fall back to 0 if no model has type: default
  default_index = models.find_index { |m| m["type"] == "default" } || 0
  default_id = models[default_index] && models[default_index]["id"]

  # Build constructor args from loaded settings (new hash-format config)
  # plus the parsed models. Only pass settings that have explicit values;
  # omitted keys get their default from AgentConfig#initialize.
  constructor_args = {
    models: models,
    current_model_index: default_index,
    current_model_id: default_id
  }
  CONFIG_SETTINGS_KEYS.each do |key|
    if loaded_settings.key?(key)
      constructor_args[key.to_sym] = loaded_settings[key]
    end
  end

  instance = new(**constructor_args)
  instance.derive_media_models!
  instance
end

Instance Method Details

#activate_fallback!(fallback_model_name) ⇒ Object

Switch to fallback model and start the cooling-off clock. Idempotent — calling again while already in :fallback_active renews the timestamp.

Parameters:

  • fallback_model_name (String) —

    the fallback model to use



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# File 'lib/clacky/agent_config.rb', line 814

def activate_fallback!(fallback_model_name)
  @fallback_state = :fallback_active
  @fallback_since = Time.now
  @fallback_model  = fallback_model_name
end

#add_model(model:, api_key:, base_url:, anthropic_format: false, type: nil) ⇒ Object

Add a new model configuration



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# File 'lib/clacky/agent_config.rb', line 598

def add_model(model:, api_key:, base_url:, anthropic_format: false, type: nil)
  @models << {
    "id" => SecureRandom.uuid,
    "api_key" => api_key,
    "base_url" => base_url,
    "model" => model,
    "anthropic_format" => anthropic_format,
    "type" => type
  }.compact
end

#anthropic_format? ⇒ Boolean

Check if should use Anthropic format for current model

Returns:

  • (Boolean) 


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# File 'lib/clacky/agent_config.rb', line 588

def anthropic_format?
  current_model&.dig("anthropic_format") || false
end

#api_key ⇒ Object

Get API key for current model



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# File 'lib/clacky/agent_config.rb', line 541

def api_key
  current_model&.dig("api_key")
end

#api_key=(value) ⇒ Object

Set API key for current model. When a virtual overlay is active, writes into the overlay (not the shared @models hash) to keep session-level isolation.



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# File 'lib/clacky/agent_config.rb', line 548

def api_key=(value)
  return unless resolve_current_model_entry
  if @virtual_model_overlay
    @virtual_model_overlay["api_key"] = value
  else
    resolve_current_model_entry["api_key"] = value
  end
end

#apply_virtual_model_overlay!(overlay) ⇒ void

This method returns an undefined value.

Apply a virtual model overlay for this session (and only this session). The overlay fields are merged on top of the current model entry when #current_model is called, without ever mutating the shared @models array or its hashes.

Used by Agent#fork_subagent when routing a subagent through a virtual lite model (Haiku for Claude family, Flash for DeepSeek, …). Apply on the forked config only — the parent config is untouched.

Parameters:

  • overlay (Hash, nil) —

    fields to overlay; pass nil or {} to clear. Recognized keys: “api_key”, “base_url”, “model”, “anthropic_format”.



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# File 'lib/clacky/agent_config.rb', line 932

def apply_virtual_model_overlay!(overlay)
  if overlay.nil? || overlay.empty?
    @virtual_model_overlay = nil
  else
    # Dup so later mutations to the passed-in hash don't leak in.
    @virtual_model_overlay = overlay.dup
  end
end

#base_url ⇒ Object

Get base URL for current model



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# File 'lib/clacky/agent_config.rb', line 558

def base_url
  current_model&.dig("base_url")
end

#base_url=(value) ⇒ Object

Set base URL for current model (overlay-aware; see #api_key=).



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# File 'lib/clacky/agent_config.rb', line 563

def base_url=(value)
  return unless resolve_current_model_entry
  if @virtual_model_overlay
    @virtual_model_overlay["base_url"] = value
  else
    resolve_current_model_entry["base_url"] = value
  end
end

#bedrock? ⇒ Boolean

Check if current model uses Bedrock Converse API (ABSK key prefix or abs- model prefix)

Returns:

  • (Boolean) 


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# File 'lib/clacky/agent_config.rb', line 593

def bedrock?
  Clacky::MessageFormat::Bedrock.bedrock_api_key?(api_key.to_s, model_name.to_s)
end

#confirm_fallback_ok! ⇒ Object

Called when a successful API response is received. If we were :probing (testing primary after cooling-off), this confirms the primary model is healthy again and resets everything. No-op in :primary_ok or :fallback_active states.



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# File 'lib/clacky/agent_config.rb', line 835

def confirm_fallback_ok!
  return unless @fallback_state == :probing

  @fallback_state = nil
  @fallback_since = nil
  @fallback_model = nil
end

#current_model ⇒ Object

Get current model configuration.

Resolution order:

1. @current_model_id (primary source of truth — stable across list edits)
2. type: default (for config.yml that sets a default explicitly)
3. @current_model_index (back-compat for very old code paths)



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# File 'lib/clacky/agent_config.rb', line 874

def current_model
  return nil if @models.empty?

  resolved = resolve_current_model_entry
  return nil unless resolved

  # Merge order (low → high): base entry, session-level sub-model override,
  # then short-lived subagent overlay. Both layers are kept separate so
  # a subagent fork can stack its own credentials on top of an active
  # sub-model pin without erasing it.
  merged = resolved
  if @session_model_overlay && !@session_model_overlay.empty?
    merged = merged.merge(@session_model_overlay)
  end
  if @virtual_model_overlay && !@virtual_model_overlay.empty?
    merged = merged.merge(@virtual_model_overlay)
  end
  merged.equal?(resolved) ? resolved : merged
end

#current_model_supports?(capability) ⇒ Boolean

Query whether the current model supports a given capability.

This is the single entry-point callers (Agent, downgrade pipeline, UI) should use instead of poking Providers directly. Benefits:

- Always reflects the current model — switching with `/model` takes
  effect immediately, no caching, no stale warnings.
- Handles the "custom base_url / unknown provider" case with a
  conservative default (assume supported), so self-hosted or new
  providers don't get accidentally downgraded.

Parameters:

  • capability (String, Symbol) —

    capability name (e.g. :vision)

Returns:

  • (Boolean) —

    true if supported (or unknown); false only when the preset explicitly declares the capability as unsupported.



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# File 'lib/clacky/agent_config.rb', line 989

def current_model_supports?(capability)
  m = current_model
  # No model configured yet → nothing to judge; assume supported so we
  # don't preemptively downgrade before a model is even picked.
  return true unless m && m["base_url"]

  provider_id = Clacky::Providers.find_by_base_url(m["base_url"])
  # Custom / self-hosted base_url not in our preset list → be conservative.
  return true unless provider_id

  Clacky::Providers.supports?(provider_id, capability, model_name: m["model"])
end

#deep_copy ⇒ Object

Create a per-session copy of this config.

Plan B (shared models): we deliberately share the SAME @models array reference with all sessions (no deep clone). This is the key design decision that keeps session and global views in sync:

- User adds a model in Settings → every live session sees it instantly.
- User edits api_key/base_url → every live session's next API call
  picks up the new credentials (via current_model lookup).
- Model ids are stable across edits, so each session's
  @current_model_id continues to resolve correctly.

Per-session state that MUST stay isolated (permission_mode, @current_model_id, @current_model_index, fallback state) are scalar copies via ‘dup` and don’t leak between sessions.

Before Plan B, sessions held deep-copied @models — which silently diverged from the global list any time the user added/edited a model in Settings, producing bugs like “Failed to switch model” for newly added models on Windows and Linux. See http_server.rb#api_switch_session_model and http_server.rb#api_save_config for the companion logic.



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# File 'lib/clacky/agent_config.rb', line 371

def deep_copy
  # dup gives us a new AgentConfig with independent scalar ivars but
  # the same @models reference — exactly what we want.
  copy = dup
  # But @virtual_model_overlay must be independent: a forked subagent
  # setting/clearing its own overlay must NOT leak into the parent.
  # (dup copies the ivar reference; an unset overlay is nil which is
  # already independent, but an active overlay must be cloned.)
  if @virtual_model_overlay
    copy.instance_variable_set(:@virtual_model_overlay, @virtual_model_overlay.dup)
  end
  if @session_model_overlay
    copy.instance_variable_set(:@session_model_overlay, @session_model_overlay.dup)
  end
  copy
end

#default_model ⇒ Object

Get the default model (type: default) Falls back to current_model for backward compatibility



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# File 'lib/clacky/agent_config.rb', line 714

def default_model
  find_model_by_type("default") || current_model
end

#derive_media_models! ⇒ Object

Kept as a no-op for backward compatibility. Media auto entries are now derived virtually on read; nothing is materialized into @models.



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# File 'lib/clacky/agent_config.rb', line 649

def derive_media_models!
  @models.reject! { |m| m["auto_injected"] && Clacky::Providers::MEDIA_KINDS.include?(m["type"].to_s) }
end

#effective_model_name ⇒ Object

The effective model name to use for API calls.

  • :primary_ok / nil → configured model_name (primary)

  • :fallback_active → fallback model

  • :probing → configured model_name (trying primary silently)



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# File 'lib/clacky/agent_config.rb', line 858

def effective_model_name
  case @fallback_state
  when :fallback_active
    @fallback_model || model_name
  else
    # :primary_ok (nil) and :probing both use the primary model
    model_name
  end
end

#fallback_active? ⇒ Boolean

Returns true when a fallback model is currently being used (:fallback_active or :probing states).

Returns:

  • (Boolean) 


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# File 'lib/clacky/agent_config.rb', line 845

def fallback_active?
  @fallback_state == :fallback_active || @fallback_state == :probing
end

#fallback_model_for(model_name) ⇒ String?

Look up the fallback model name for the given model name. Uses the provider preset’s fallback_models table. Returns nil if no fallback is configured for this model.

Parameters:

  • model_name (String) —

    the primary model name (e.g. “abs-claude-sonnet-4-6”)

Returns:

  • (String, nil) 


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# File 'lib/clacky/agent_config.rb', line 798

def fallback_model_for(model_name)
  m = current_model
  return nil unless m

  provider_id = Clacky::Providers.resolve_provider(
    base_url: m["base_url"],
    api_key:  m["api_key"]
  )
  return nil unless provider_id

  Clacky::Providers.fallback_model(provider_id, model_name)
end

#find_model_by_name_and_url(model_name, base_url = nil) ⇒ Hash?

Find model by composite key (model name + base_url). Used when restoring a session to match its original model without relying on the runtime-only id (which changes on every process restart). base_url is optional for backward compatibility with sessions saved before base_url was persisted.

Parameters:

  • model_name (String) —

    the model’s “model” field (e.g. “dsk-deepseek-v4-pro”)

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

    the model’s “base_url” field

Returns:

  • (Hash, nil) —

    the matching model entry or nil



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# File 'lib/clacky/agent_config.rb', line 705

def find_model_by_name_and_url(model_name, base_url = nil)
  @models.find do |m|
    m["model"] == model_name &&
      (base_url.nil? || m["base_url"] == base_url)
  end
end

#find_model_by_type(type) ⇒ Object

Find model by type (default or lite or media kind) Returns the model hash or nil if not found. For media kinds (image/video/audio): explicit user-configured (custom) entries win; otherwise an auto-derived virtual entry is returned based on the default model’s provider — mirroring how lite is virtually derived via #lite_model_config_for_current.



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# File 'lib/clacky/agent_config.rb', line 615

def find_model_by_type(type)
  kind = type.to_s
  if Clacky::Providers::MEDIA_KINDS.include?(kind)
    custom = @models.find { |m| m["type"] == kind }
    return custom if custom
    return derive_media_model(kind)
  end
  @models.find { |m| m["type"] == type }
end

#get_model(index) ⇒ Object

Get model by index



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# File 'lib/clacky/agent_config.rb', line 443

def get_model(index)
  @models[index]
end

#lite_model ⇒ Object

Explicit lite model entry (type: “lite”) — only present when the user configured ‘CLACKY_LITE_*` environment variables. Returns nil otherwise.

This is the “user override” path. The preferred way for subagents to obtain a lite model is ‘#lite_model_config_for_current`, which falls back to this method when an explicit lite exists.



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# File 'lib/clacky/agent_config.rb', line 724

def lite_model
  find_model_by_type("lite")
end

#lite_model_config_for_current ⇒ Hash?

Return a complete lite model config hash for the currently-active primary model, or nil if none is available.

Resolution order:

1. Explicit user-configured lite (type: "lite", from CLACKY_LITE_*
   env vars). Wins over provider presets so power users retain full
   control.
2. Provider preset: look up the current model's provider, consult its
   per-family `lite_models` table (e.g. openclacky: Claude → Haiku,
   DeepSeek V4-pro → DeepSeek V4-flash). If matched, return a virtual
   hash that reuses the current model's api_key / base_url — only
   the model name (and anthropic_format, if provider-specific) differ.
3. nil — either the provider has no lite mapping for this primary
   (e.g. the current model is already lite-class like Haiku), or the
   provider is unknown. Callers should treat this as "no lite
   available; use the primary as-is".

The returned hash is not added to @models. It’s consumed directly by ‘Agent#fork_subagent(model: “lite”)`, which applies the fields to the forked config. This means:

- Switching the primary model automatically changes which lite is
  used, with zero additional bookkeeping.
- @models stays a clean list of user-facing models (no phantom
  auto-injected entries cluttering the model picker in the UI).

Returns:

  • (Hash, nil) —

    a hash with keys api_key, base_url, model, anthropic_format, plus an “id” of the form “lite:<primary_id>” for logging/debugging; nil if no lite is resolvable.



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# File 'lib/clacky/agent_config.rb', line 756

def lite_model_config_for_current
  # 1) Explicit user-configured lite wins
  explicit = find_model_by_type("lite")
  return explicit if explicit

  # 2) Provider preset derivation
  primary = current_model
  return nil unless primary && primary["base_url"] && primary["model"]

  # Use resolve_provider (base_url first, then clacky-* api_key fallback
  # for local-debug / self-hosted proxies).
  provider_id = Clacky::Providers.resolve_provider(
    base_url: primary["base_url"],
    api_key:  primary["api_key"]
  )
  return nil unless provider_id

  lite_name = Clacky::Providers.lite_model(provider_id, primary["model"])
  return nil unless lite_name

  # If the current primary IS already a lite-class model, skip.
  return nil if lite_name == primary["model"]

  {
    "id"               => "lite:#{primary["id"]}",
    "type"             => "lite",
    "api_key"          => primary["api_key"],
    "base_url"         => primary["base_url"],
    "model"            => lite_name,
    "anthropic_format" => primary["anthropic_format"] || false,
    "virtual"          => true  # marker: not a real @models entry
  }
end

#maybe_start_probing ⇒ Object

Called at the start of every call_llm. If cooling-off has expired, transition from :fallback_active → :probing so the next request will silently test the primary model. No-op in any other state.



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# File 'lib/clacky/agent_config.rb', line 824

def maybe_start_probing
  return unless @fallback_state == :fallback_active
  return unless @fallback_since && (Time.now - @fallback_since) >= FALLBACK_COOLING_OFF_SECONDS

  @fallback_state = :probing
end

#media_state(kind) ⇒ Hash{String=>Object}

Returns the configured/derived media model entry for ‘kind`, plus a hint about its source. UI uses this to render the tri-state control.

Parameters:

  • kind (String) —

    one of “image” / “video” / “audio”

Returns:

  • (Hash{String=>Object}) —

    keys: “configured” [Boolean] — anything available? “source” [String] — “off” | “auto” | “custom” “model” [String, nil] “base_url” [String, nil] “provider” [String, nil] — provider id “available” [Array<String>] — auto-source candidates from preset



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# File 'lib/clacky/agent_config.rb', line 663

def media_state(kind)
  kind = kind.to_s
  custom = @models.find { |m| m["type"] == kind }
  auto   = custom ? nil : derive_media_model(kind)
  entry  = custom || auto

  provider_id = if entry
                  Clacky::Providers.resolve_provider(
                    base_url: entry["base_url"],
                    api_key:  entry["api_key"]
                  )
                end

  available_provider_id = if custom
                            provider_id
                          else
                            default = find_model_by_type("default")
                            default && Clacky::Providers.resolve_provider(
                              base_url: default["base_url"],
                              api_key:  default["api_key"]
                            )
                          end
  available = available_provider_id ? Clacky::Providers.media_models(available_provider_id, kind) : []

  {
    "configured" => !entry.nil?,
    "source"     => custom ? "custom" : (auto ? "auto" : "off"),
    "model"      => entry && entry["model"],
    "base_url"   => entry && entry["base_url"],
    "provider"   => provider_id,
    "available"  => available
  }
end

#model_name ⇒ Object

Get model name for current model



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# File 'lib/clacky/agent_config.rb', line 573

def model_name
  current_model&.dig("model")
end

#model_name=(value) ⇒ Object

Set model name for current model (overlay-aware; see #api_key=).



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# File 'lib/clacky/agent_config.rb', line 578

def model_name=(value)
  return unless resolve_current_model_entry
  if @virtual_model_overlay
    @virtual_model_overlay["model"] = value
  else
    resolve_current_model_entry["model"] = value
  end
end

#model_names ⇒ Object

List all model names



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# File 'lib/clacky/agent_config.rb', line 536

def model_names
  @models.map { |m| m["model"] }
end

#models_configured? ⇒ Boolean

Check if any model is configured

Returns:

  • (Boolean) 


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# File 'lib/clacky/agent_config.rb', line 434

def models_configured?
  !@models.empty? && !current_model.nil?
end

#probing? ⇒ Boolean

Returns true only when we are silently probing the primary model.

Returns:

  • (Boolean) 


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# File 'lib/clacky/agent_config.rb', line 850

def probing?
  @fallback_state == :probing
end

#remove_model(index) ⇒ Object

Remove a model by index Returns true if removed, false if index out of range or it’s the last model



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# File 'lib/clacky/agent_config.rb', line 1029

def remove_model(index)
  # Don't allow removing the last model
  return false if @models.length <= 1
  return false if index < 0 || index >= @models.length

  removed = @models.delete_at(index)

  # Adjust current_model_index if necessary
  if @current_model_index >= @models.length
    @current_model_index = @models.length - 1
  end

  # If the removed model was the current one, clear @current_model_id.
  # current_model will then fall back to type: default / current_model_index.
  if removed && @current_model_id == removed["id"]
    @current_model_id = nil
  end

  true
end

#save(config_file = CONFIG_FILE) ⇒ Object 



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# File 'lib/clacky/agent_config.rb', line 388

def save(config_file = CONFIG_FILE)
  config_dir = File.dirname(config_file)
  FileUtils.mkdir_p(config_dir)
  File.write(config_file, to_yaml)
  FileUtils.chmod(0o600, config_file)
end

#session_model_overlay ⇒ Hash?

Returns the active session sub-model overlay.

Returns:

  • (Hash, nil) —

    the active session sub-model overlay



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# File 'lib/clacky/agent_config.rb', line 964

def session_model_overlay
  @session_model_overlay
end

#session_model_overlay=(model_name) ⇒ Object

Apply a session-level sub-model override. Lives on this AgentConfig only (each session deep_copy’s its own scalar ivar) and survives a restart through the session file. Pass nil or “” to clear.

The override only rewrites the resolved current_model’s “model” field —api_key / base_url / anthropic_format come from the underlying card, so the user’s credentials and provider identity are untouched.

Parameters:

  • model_name (String, nil) —

    sub-model name, e.g. “dsk-deepseek-v4-pro”



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# File 'lib/clacky/agent_config.rb', line 955

def session_model_overlay=(model_name)
  if model_name.nil? || model_name.to_s.strip.empty?
    @session_model_overlay = nil
  else
    @session_model_overlay = { "model" => model_name.to_s.strip }
  end
end

#session_model_overlay_name ⇒ String?

Convenience accessor: the sub-model name currently pinned on this session, or nil when no override is active. Used by serializers and the WebUI to surface “card · sub-model” two-line displays.

Returns:

  • (String, nil) 


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# File 'lib/clacky/agent_config.rb', line 972

def session_model_overlay_name
  @session_model_overlay && @session_model_overlay["model"]
end

#set_default_model_by_id(id) ⇒ Boolean

Set the global default model marker (‘type: “default”`).

This is separate from ‘switch_model_by_id`:

- `switch_model_by_id` only changes this session's current model.
- `set_default_model_by_id` mutates the shared `@models` array by
  moving the `type: "default"` marker to the given model.

Use cases:

- CLI (single-session): when the user picks a model, we both switch
  this session AND update the global default so future CLI launches
  use the same model. Caller must `save` to persist.
- Web UI Settings save flow: also uses this (via payload).

Do NOT call from per-session model switching in multi-session contexts (Web UI session-level switch), since it would leak into other sessions and change what new sessions start with.

Only one model may carry ‘type: “default”` at a time — this method clears the marker on any other model that had it.

Note: if the target model currently has ‘type: “lite”`, this method will overwrite it with `“default”`. That matches the existing single-slot `type` field semantics in the codebase.

Parameters:

  • id (String) —

    the model’s runtime id

Returns:

  • (Boolean) —

    true if marker was moved, false if id not found



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# File 'lib/clacky/agent_config.rb', line 518

def set_default_model_by_id(id)
  return false if id.nil? || id.to_s.empty?

  target = @models.find { |m| m["id"] == id }
  return false if target.nil?

  # Clear existing default marker(s) — there should only be one, but
  # be defensive in case of corrupted config.
  @models.each do |m|
    next if m["id"] == id
    m.delete("type") if m["type"] == "default"
  end

  target["type"] = "default"
  true
end

#set_model_type(index, type) ⇒ Object

Set a model’s type (default, lite, image, video, or audio). At most one model carries each type at a time. Returns true if successful

Parameters:

  • index (Integer) —

    the model index

  • type (String, nil) —

    type tag, or nil to clear



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# File 'lib/clacky/agent_config.rb', line 1007

def set_model_type(index, type)
  return false if index < 0 || index >= @models.length
  return false unless ["default", "lite", "image", "video", "audio", nil].include?(type)

  if type
    # Remove type from any other model that has it
    @models.each do |m|
      m.delete("type") if m["type"] == type
    end
    
    # Set type on target model
    @models[index]["type"] = type
  else
    # Remove type from target model
    @models[index].delete("type")
  end

  true
end

#switch_model_by_id(id) ⇒ Boolean

Switch the current session to a specific model, identified by its stable runtime id.

This is a per-session operation:

- Updates this AgentConfig's `@current_model_id` (primary truth)
- Updates `@current_model_index` for back-compat observers
- Does NOT mutate the shared `@models` array's `type: "default"`
  marker. The "default model" is a global setting (initial model
  for new sessions) and is only changed via the Settings UI
  "save config" flow (`api_save_config`).

Parameters:

  • id (String) —

    the model’s runtime id (see parse_models)

Returns:

  • (Boolean) —

    true if switched, false if id not found



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# File 'lib/clacky/agent_config.rb', line 460

def switch_model_by_id(id)
  return false if id.nil? || id.to_s.empty?

  index = @models.find_index { |m| m["id"] == id }
  return false if index.nil?

  previous_id = @current_model_id
  @current_model_id = id
  @current_model_index = index

  @session_model_overlay = nil if previous_id != id

  true
end

#switch_model_by_name(name) ⇒ Boolean

Switch to a model by its display name (fuzzy match, case-insensitive).

Parameters:

  • name (String) —

    the model name to search for (e.g. “gpt-5.3-codex”)

Returns:

  • (Boolean) —

    true if switched, false if name not found



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# File 'lib/clacky/agent_config.rb', line 479

def switch_model_by_name(name)
  return false if name.nil? || name.to_s.strip.empty?

  name_str = name.to_s.strip.downcase
  index = @models.find_index { |m| m["model"].to_s.downcase == name_str }
  return false if index.nil?

  @current_model_id = @models[index]["id"]
  @current_model_index = index

  true
end

#to_yaml ⇒ Object

Serialize the current agent configuration to YAML. Outputs a hash with “settings” and “models” keys (new format). Backward compatibility: old flat-array format is still readable by .load.



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# File 'lib/clacky/agent_config.rb', line 415

def to_yaml
  persistable_models = @models.reject { |m| m["auto_injected"] }.map do |m|
    m.reject { |k, _| RUNTIME_ONLY_FIELDS.include?(k) }
  end
  settings = {
    "enable_compression" => @enable_compression,
    "enable_prompt_caching" => @enable_prompt_caching,
    "compression_threshold" => @compression_threshold,
    "message_count_threshold" => @message_count_threshold,
    "memory_update_enabled" => @memory_update_enabled,
    "skill_evolution" => @skill_evolution,
    "max_running_agents" => @max_running_agents,
    "max_idle_agents" => @max_idle_agents,
    "default_working_dir" => @default_working_dir
  }
  YAML.dump("settings" => settings, "models" => persistable_models)
end

#virtual_model_overlay ⇒ Hash?

Returns the active overlay (read-only view; dup before mutating).

Returns:

  • (Hash, nil) —

    the active overlay (read-only view; dup before mutating)



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# File 'lib/clacky/agent_config.rb', line 942

def virtual_model_overlay
  @virtual_model_overlay
end