Class: LittleGhost::Agent
- Extended by:
- Support::ClassAttributes
- Includes:
- ContextManagement, Delegation, Skills, ToolLoop
- Defined in:
- lib/little_ghost/agent.rb,
lib/little_ghost/agent/skills.rb,
lib/little_ghost/agent/tool_loop.rb,
lib/little_ghost/agent/delegation.rb,
lib/little_ghost/agent/context_management.rb
Overview
Defines one reusable model-driven behavior with prompts, tools, and limits. Each Agent subclass describes one application role with an inheritable Ruby DSL. It can answer, stream, call tools, and delegate work.
Start with one role and add capabilities as its work grows:
class CustomerSupportAgent < LittleGhost::Agent
description "Handles support requests"
model "openrouter:openai/gpt-5.6-luna"
system_prompt "Answer customer questions clearly."
end
run = CustomerSupportAgent.ask("Why is transfer 481 pending?")
run.completed? # => true
run.response
# One possible response: Transfer 481 is waiting for the receiving bank.
An Agent is the smallest Assembly: it owns one model loop while inheriting
the same ask and stream_ask entrypoints as coordinated assemblies.
Add tools for application operations and subagents for model-directed
delegation.
Call a named Agent with ask when you need the final Run, or the streaming entrypoint when you want events as the answer arrives.
Most applications call a named Agent class. LittleGhost automatically
reuses the active Configuration's shared Runtime while building a fresh
top-level Run for every call. Passing runtime: is an advanced option for
an explicitly isolated setup.
Agent declarations are inherited. Define a short prompt inline, or place a
growing prompt in app/prompts/customer_support/system.erb for
CustomerSupportAgent. The Prompts as Views guide
explains conventional lookup, locals, and partials. Optional features such
as skills, context management, loop detection, and delegation stay inactive
until their DSL is used.
Calling LittleGhost::Agent itself uses You are a helpful agent. as the system prompt. Subclasses use the inline or conventional prompt they declare.
Models may return text or locally validated structured data. LittleGhost hides unexpected Tool exception messages from the model. See Run for outcomes, cancellation, and cleanup, and Assembly for the advanced run-scoped form.
Defined Under Namespace
Modules: ContextManagement, Delegation, Skills, ToolLoop Classes: ExecutedTool
Constant Summary collapse
- DEFAULT_SYSTEM_PROMPT =
:nodoc:
"You are a helpful agent."- DEFAULT_MAX_TOOL_RESULT_TOKENS =
:nodoc:
10_000- MAX_STRUCTURED_RESULT_BYTES =
:nodoc:
1_000_000- MAX_STRUCTURED_RESULT_DEPTH =
:nodoc:
64- MAX_STRUCTURED_RESULT_NODES =
:nodoc:
100_000- RESULT_SCHEMA_KEYWORDS =
%w[ $schema title description type enum minimum maximum minLength maxLength properties required additionalProperties minItems maxItems items ].freeze
- CALLBACKS =
:nodoc:
%i[ after_initialize before_invocation after_invocation before_model after_model after_model_error before_tool after_tool ].freeze
Constants included from ContextManagement
ContextManagement::DEFAULT_COMPRESSION_THRESHOLD, ContextManagement::DEFAULT_CONTEXT_WINDOW_TOKENS, ContextManagement::DEFAULT_PRESERVE_RECENT_MESSAGES, ContextManagement::DEFAULT_SUMMARY_RATIO, ContextManagement::ESTIMATED_CHARS_PER_TOKEN, ContextManagement::OUTPUT_LIMIT_STOP_REASONS, ContextManagement::SUMMARIZATION_PROMPT
Constants included from ToolLoop
ToolLoop::FINAL_WARNING, ToolLoop::TRACKED_INVOCATION_LIMIT, ToolLoop::WARNING
Constants inherited from Assembly
LittleGhost::Assembly::MAX_STEP_EVENTS, LittleGhost::Assembly::MAX_STEP_EVENT_BYTES, LittleGhost::Assembly::MAX_STEP_OUTPUT_BYTES
Instance Attribute Summary collapse
-
#agent_path ⇒ Object
readonly
This Agent's location in the bounded subagent tree.
-
#assembly_transition ⇒ Object
readonly
:nodoc:.
-
#delegation_activity ⇒ Object
readonly
Shared delegation tracker, when subagents are enabled.
-
#max_tool_calls ⇒ Object
readonly
Maximum Tool calls allowed during one invocation.
-
#model ⇒ Object
readonly
The resolved model used by this run-scoped Agent.
-
#run ⇒ Object
readonly
The owning Run, or
nilfor a standalone entrypoint. -
#runtime ⇒ Object
readonly
Runtime used to build this agent's model, tools, workspace, and sandbox.
-
#sandbox ⇒ Object
readonly
Run-scoped sandbox used for filesystem and process operations.
-
#tool_registry ⇒ Object
readonly
Tools created and bound for this Agent's owning Run.
-
#workspace ⇒ Object
readonly
Run-scoped workspace available to Tools and extensions.
Class Method Summary collapse
-
.agent_id(*values) ⇒ Object
:call-seq: agent_id() -> String agent_id(value) -> String.
-
.callbacks ⇒ Object
:nodoc:.
-
.capture_diagnostics(*values) ⇒ Object
:call-seq: capture_diagnostics() -> true or false capture_diagnostics(value) -> true or false.
-
.limits(**values) ⇒ Object
:call-seq: limits() -> Hash limits(**values) -> Hash.
-
.logical_path ⇒ Object
The underscored, namespace-aware path used for conventional prompt lookup.
-
.model(*values, &block) ⇒ Object
:call-seq: model() -> String, Symbol, Hash, Proc, nil model(role_or_target) -> String, Symbol model(provider:, model:, **settings) -> Hash model { |invocation| ... } -> Proc.
-
.model_selection(invocation) ⇒ Object
:nodoc:.
-
.prompt_local(name, *values, &resolver) ⇒ Object
Adds a named value or resolver to every prompt rendered for the agent.
-
.prompt_local_resolvers ⇒ Object
:nodoc:.
-
.result_schema(schema = nil, name: nil, description: nil, strategy: :auto, **schema_keywords) ⇒ Object
:call-seq: result_schema() -> Hash, nil result_schema(schema, name: nil, description: nil, strategy: :auto) -> Hash result_schema(name: nil, description: nil, strategy: :auto, **schema) -> Hash.
-
.system_prompt(*values, &block) ⇒ Object
:call-seq: system_prompt() -> String, Proc, nil system_prompt(value) -> String system_prompt { |locals| ... } -> Proc.
-
.system_template(*values) ⇒ Object
:call-seq: system_template() -> String, nil system_template(path) -> String.
-
.tool_declarations ⇒ Object
:nodoc:.
-
.tools(*values) ⇒ Object
Adds tool or provider classes to the agent.
Instance Method Summary collapse
-
#close ⇒ Object
Closes owned tools, interjections, sandbox, and workspace resources.
-
#dispatch_tools(tool_uses, context:, events:, parent_operation_id:, parent_trace_context: nil) ⇒ Object
:nodoc:.
-
#entrypoint_name ⇒ Object
:nodoc:.
-
#initialize(model: nil, runtime: nil, tools: [], template_resolver: nil, template_paths: [], run: nil, executor: Support::Executor.new, delegation_activity: nil, agent_path: Subagents::AgentPath::ROOT, max_turns: 100, max_tool_calls: 1_000, max_tool_result_tokens: DEFAULT_MAX_TOOL_RESULT_TOKENS, model_settings: {}, workspace: nil, sandbox: nil) ⇒ Agent
constructor
Creates either a standalone entrypoint or a run-scoped agent.
-
#interject(message, cancellation_token: Support::CancellationToken.new, deadline: nil, target_operation_id: nil, interjection_id: nil, batch_key: nil, metadata: {}) ⇒ Object
Adds an interjection and returns the model's immediate result details.
-
#prompt_locals ⇒ Object
Materializes and freezes the prompt locals declared on the agent class.
-
#request_assembly_transition(value, context:) ⇒ Object
:nodoc:.
-
#stream(input = nil, history: nil, context: nil, cancellation_token: Support::CancellationToken.new, deadline: nil, settings: nil, template_locals: nil, template_paths: nil, parent_operation_id: nil, checkpoint: nil, conversation_id: nil, interjection_metadata: nil, interjection_ids: [], interject_ready: nil) ⇒ Object
Streams one invocation as StreamEvent objects.
-
#tools ⇒ Object
The materialized tools available during this agent run.
Methods included from Support::ClassAttributes
Methods included from Delegation
Methods included from Skills
Methods included from ContextManagement
Methods included from ToolLoop
Methods inherited from Assembly
#as_tool, ask, #ask, assembly_id, assembly_kind, #build_run, #call, definition, description, #start_execution, stream_ask, #stream_ask, to_builder, validate_step_policy!
Constructor Details
#initialize(model: nil, runtime: nil, tools: [], template_resolver: nil, template_paths: [], run: nil, executor: Support::Executor.new, delegation_activity: nil, agent_path: Subagents::AgentPath::ROOT, max_turns: 100, max_tool_calls: 1_000, max_tool_result_tokens: DEFAULT_MAX_TOOL_RESULT_TOKENS, model_settings: {}, workspace: nil, sandbox: nil) ⇒ Agent
Creates either a standalone entrypoint or a run-scoped agent. :call-seq:
new(runtime: nil) -> Agent
new(model:, runtime:, tools:, run:, ...) -> Agent
The first form is the application-facing entrypoint. It may be reused for independent concurrent calls and creates a fresh Run for each one. The second form is run-scoped; Runtime builders supply its dependencies and it must not outlive or be shared outside its owning Run.
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# File 'lib/little_ghost/agent.rb', line 499 def initialize( model: nil, runtime: nil, tools: [], template_resolver: nil, template_paths: [], run: nil, executor: Support::Executor.new, delegation_activity: nil, agent_path: Subagents::AgentPath::ROOT, max_turns: 100, max_tool_calls: 1_000, max_tool_result_tokens: DEFAULT_MAX_TOOL_RESULT_TOKENS, model_settings: {}, workspace: nil, sandbox: nil ) standalone = model.nil? && run.nil? super(run:, runtime:, workspace:, sandbox:, standalone:) if standalone @owns_resources = true @closed = false @close_mutex = Mutex.new @interjections_mutex = Mutex.new @active_interjections = [] return end @model = model @runtime = runtime || run&.runtime @run = run @workspace = workspace || run&.workspace @sandbox = sandbox || run&.sandbox if @runtime.is_a?(Runtime) && !@workspace @workspace = @runtime.build_workspace @sandbox ||= @runtime.build_sandbox(workspace: @workspace) end @owns_resources = run.nil? && (@workspace || @sandbox) binding = Tool::Binding.new(agent: self, run:, runtime: @runtime, model:, workspace: @workspace, sandbox: @sandbox) @tool_registry = ToolRegistry.new(tools, binding:) self.class.tool_declarations.each do |declaration| @tool_registry.register(declaration, replace: true) end @structured_output_strategy = StructuredOutput.resolve( self.class.result_schema, model:, ordinary_tools: @tool_registry.specifications ) @model_settings = model_settings.to_h.freeze @template_resolver = template_resolver || default_template_resolver(template_paths) @executor = executor @delegation_activity = delegation_activity @agent_path = Subagents::AgentPath.validate!(agent_path) @max_turns = Integer(max_turns) @max_tool_calls = Integer(max_tool_calls) @max_tool_result_tokens = Integer(max_tool_result_tokens) @closed = false @close_mutex = Mutex.new @exclusive_tools_mutex = Mutex.new @interjections_mutex = Mutex.new @active_interjections = [] @assembly_transitions_mutex = Mutex.new @assembly_transitions = {} @assembly_tool_batch_sizes = {} @assembly_transition = nil raise ArgumentError, "max_turns must be at least 1" if @max_turns < 1 raise ArgumentError, "max_tool_calls must be at least 1" if @max_tool_calls < 1 raise ArgumentError, "max_tool_result_tokens must be at least 1" if @max_tool_result_tokens < 1 apply_cancellation_decision!(run_callbacks(:after_initialize, self)) rescue @tool_registry&.close raise end |
Instance Attribute Details
#agent_path ⇒ Object (readonly)
This Agent's location in the bounded subagent tree.
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# File 'lib/little_ghost/agent.rb', line 482 def agent_path @agent_path end |
#assembly_transition ⇒ Object (readonly)
:nodoc:
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# File 'lib/little_ghost/agent.rb', line 596 def assembly_transition @assembly_transition end |
#delegation_activity ⇒ Object (readonly)
Shared delegation tracker, when subagents are enabled.
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# File 'lib/little_ghost/agent.rb', line 480 def delegation_activity @delegation_activity end |
#max_tool_calls ⇒ Object (readonly)
Maximum Tool calls allowed during one invocation.
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# File 'lib/little_ghost/agent.rb', line 488 def max_tool_calls @max_tool_calls end |
#model ⇒ Object (readonly)
The resolved model used by this run-scoped Agent.
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# File 'lib/little_ghost/agent.rb', line 474 def model @model end |
#run ⇒ Object (readonly)
The owning Run, or nil for a standalone entrypoint.
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# File 'lib/little_ghost/agent.rb', line 478 def run @run end |
#runtime ⇒ Object (readonly)
Runtime used to build this agent's model, tools, workspace, and sandbox.
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# File 'lib/little_ghost/agent.rb', line 574 def runtime @runtime end |
#sandbox ⇒ Object (readonly)
Run-scoped sandbox used for filesystem and process operations.
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# File 'lib/little_ghost/agent.rb', line 486 def sandbox @sandbox end |
#tool_registry ⇒ Object (readonly)
Tools created and bound for this Agent's owning Run.
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# File 'lib/little_ghost/agent.rb', line 476 def tool_registry @tool_registry end |
#workspace ⇒ Object (readonly)
Run-scoped workspace available to Tools and extensions.
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# File 'lib/little_ghost/agent.rb', line 484 def workspace @workspace end |
Class Method Details
.agent_id(*values) ⇒ Object
:call-seq:
agent_id() -> String
agent_id(value) -> String
The stable identifier used in telemetry, delegation, and default tool names.
Named subclasses derive it from their underscored class name without an
Agent suffix; passing value replaces that default.
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# File 'lib/little_ghost/agent.rb', line 98 def agent_id(*values) return assembly_id if values.empty? assembly_id(values.fetch(0)) end |
.callbacks ⇒ Object
:nodoc:
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# File 'lib/little_ghost/agent.rb', line 282 def callbacks = callback_values # :nodoc: |
.capture_diagnostics(*values) ⇒ Object
:call-seq:
capture_diagnostics() -> true or false
capture_diagnostics(value) -> true or false
Whether agent-layer diagnostics may include model and tool content.
Capture defaults to true, and only a literal true enables it. This
setting does not disable run-level input and output capture from an
enabled process-wide Support::ContentCapture policy. For sensitive work,
also install Support::ContentCapture.disabled or an appropriate scrubber
through Instrumentation.capture_content.
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# File 'lib/little_ghost/agent.rb', line 216 def capture_diagnostics(*values) return capture_diagnostics_value if values.empty? self.capture_diagnostics_value = values.fetch(0) == true end |
.limits(**values) ⇒ Object
:call-seq:
limits() -> Hash
limits(**values) -> Hash
Inherited execution limits for model turns, tool calls, and tool output.
Keyword arguments merge into the current limits and the zero-argument form returns them.
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# File 'lib/little_ghost/agent.rb', line 151 def limits(**values) return limits_value if values.empty? self.limits_value = limits.merge(values.transform_keys(&:to_sym)) end |
.logical_path ⇒ Object
The underscored, namespace-aware path used for conventional prompt lookup.
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# File 'lib/little_ghost/agent.rb', line 105 def logical_path parts = name.to_s.split("::") parts[-1] = parts.last.sub(/Agent\z/, "") if parts.any? parts.reject(&:empty?).map { |part| underscore(part) }.join("/") end |
.model(*values, &block) ⇒ Object
:call-seq:
model() -> String, Symbol, Hash, Proc, nil
model(role_or_target) -> String, Symbol
model(provider:, model:, **settings) -> Hash
model { |invocation| ... } -> Proc
Selects this agent's model by logical role, canonical
provider:model-id target, or an inline mapping with provider,
model, and trusted model settings. The provider names a configured
connection, not necessarily its adapter.
Pass a block to choose any supported form from each Invocation at run time. Inline mappings use flat settings, for example:
model(provider: "openai", model: "gpt-5.6-luna", reasoning_effort: "high")
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# File 'lib/little_ghost/agent.rb', line 126 def model(*values, &block) return model_value if values.empty? && !block if block && !values.empty? raise ArgumentError, "model accepts either one selection or a block" end if values.length > 1 raise ArgumentError, "model accepts one selection" end self.model_value = block || copy_model_selection(values.fetch(0)) end |
.model_selection(invocation) ⇒ Object
:nodoc:
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# File 'lib/little_ghost/agent.rb', line 138 def model_selection(invocation) # :nodoc: value = model_value value.is_a?(Proc) ? value.call(invocation) : value end |
.prompt_local(name, *values, &resolver) ⇒ Object
Adds a named value or resolver to every prompt rendered for the agent.
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# File 'lib/little_ghost/agent.rb', line 273 def prompt_local(name, *values, &resolver) raise ArgumentError, "Provide a prompt local value or block" if values.empty? && !resolver raise ArgumentError, "Provide a prompt local value or block, not both" unless values.empty? || !resolver self.prompt_local_values = prompt_local_values.merge(name.to_sym => resolver || values.fetch(0)) end |
.prompt_local_resolvers ⇒ Object
:nodoc:
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# File 'lib/little_ghost/agent.rb', line 280 def prompt_local_resolvers = prompt_local_values # :nodoc: |
.result_schema(schema = nil, name: nil, description: nil, strategy: :auto, **schema_keywords) ⇒ Object
:call-seq:
result_schema() -> Hash, nil
result_schema(schema, name: nil, description: nil, strategy: :auto) -> Hash
result_schema(name: nil, description: nil, strategy: :auto, **schema) -> Hash
Declares a strict JSON-object result contract. Every object must set additionalProperties: false and require each property. Automatic strategy selection prefers provider-native structured output and falls back to a terminal tool when supported.
During execution, a missing or invalid result receives one repair attempt
before LittleGhost::StructuredResultError is raised inside the owning Run.
A top-level ask records it on a failed Run. Invalid schemas and strategies
raise LittleGhost::ConfigurationError before execution begins.
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# File 'lib/little_ghost/agent.rb', line 171 def result_schema(schema = nil, name: nil, description: nil, strategy: :auto, **schema_keywords) return result_schema_value if schema.nil? && schema_keywords.empty? && name.nil? && description.nil? && strategy == :auto if schema.nil? schema = schema_keywords elsif !schema_keywords.empty? raise ArgumentError, "Provide result_schema as a hash or keyword schema, not both" end raise ArgumentError, "result_schema must be a hash" unless schema.is_a?(Hash) normalized_schema = Class.new(Tool).tap { |tool| tool.input_schema(schema) }.input_schema validate_result_schema_keywords!(normalized_schema) unless normalized_schema["type"] == "object" raise ConfigurationError, "result_schema must describe a top-level object" end schema_name = (name || "#{agent_id}_result").to_s unless schema_name.match?(/\A[a-zA-Z0-9_-]{1,64}\z/) raise ConfigurationError, "result_schema name must contain 1-64 letters, numbers, underscores, or hyphens" end strategy = strategy.to_sym unless StructuredOutput::STRATEGIES.include?(strategy) raise ConfigurationError, "result_schema strategy must be auto, provider, or tool" end self.result_schema_value = { schema: normalized_schema, name: schema_name, description: description&.to_s, strategy: } end |
.system_prompt(*values, &block) ⇒ Object
:call-seq:
system_prompt() -> String, Proc, nil
system_prompt(value) -> String
system_prompt { |locals| ... } -> Proc
The inline system prompt or prompt-building block.
Setting an inline prompt clears system_template so one source remains
authoritative.
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# File 'lib/little_ghost/agent.rb', line 242 def system_prompt(*values, &block) return system_prompt_builder_value || system_prompt_value if values.empty? && !block self.system_template_value = nil if block self.system_prompt_value = nil self.system_prompt_builder_value = block else self.system_prompt_value = values.fetch(0).to_s self.system_prompt_builder_value = nil end end |
.system_template(*values) ⇒ Object
:call-seq:
system_template() -> String, nil
system_template(path) -> String
The explicit system prompt template path, when conventional lookup is not used.
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# File 'lib/little_ghost/agent.rb', line 227 def system_template(*values) return system_template_value if values.empty? self.system_template_value = values.fetch(0).to_s end |
.tool_declarations ⇒ Object
:nodoc:
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# File 'lib/little_ghost/agent.rb', line 270 def tool_declarations = tool_declarations_value # :nodoc: |
.tools(*values) ⇒ Object
Adds tool or provider classes to the agent.
Every declaration must be a class. A provider class can supply tools dynamically by implementing tools(binding).
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# File 'lib/little_ghost/agent.rb', line 259 def tools(*values) invalid = values.flatten.compact.find { |value| !value.is_a?(Class) } if invalid raise ConfigurationError, "Class-level tools must be classes" end declarations = tool_declarations_value + values self.tool_declarations_value = declarations tool_declarations end |
Instance Method Details
#close ⇒ Object
Closes owned tools, interjections, sandbox, and workspace resources. The operation is idempotent and re-raises the first cleanup failure.
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# File 'lib/little_ghost/agent.rb', line 773 def close resources, interjections = @close_mutex.synchronize do return if @closed @closed = true [ [tool_registry, (@sandbox if @owns_resources), (@workspace if @owns_resources)], @interjections_mutex.synchronize { @active_interjections.dup } ] end first_error = nil interjections.each do |active| active.close(AgentInterjectionError.new("Agent was closed")) end resources.each do |resource| resource.close if resource.respond_to?(:close) rescue => error first_error ||= error end raise first_error if first_error end |
#dispatch_tools(tool_uses, context:, events:, parent_operation_id:, parent_trace_context: nil) ⇒ Object
:nodoc:
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# File 'lib/little_ghost/agent.rb', line 578 def dispatch_tools(tool_uses, context:, events:, parent_operation_id:, parent_trace_context: nil) # :nodoc: execute_tools(tool_uses, context, events, parent_operation_id:, parent_trace_context:) end |
#entrypoint_name ⇒ Object
:nodoc:
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# File 'lib/little_ghost/agent.rb', line 576 def entrypoint_name = self.class.agent_id # :nodoc: |
#interject(message, cancellation_token: Support::CancellationToken.new, deadline: nil, target_operation_id: nil, interjection_id: nil, batch_key: nil, metadata: {}) ⇒ Object
Adds an interjection and returns the model's immediate result details.
Use target_operation_id when an agent has multiple active invocations.
Messages may contain only text, image, or document content. The returned
result value exposes text, tool_calls?, interjection_ids, and
batch_key; tool calls may continue after this result. Depend on these
methods rather than the result's concrete class.
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# File 'lib/little_ghost/agent.rb', line 605 def interject( , cancellation_token: Support::CancellationToken.new, deadline: nil, target_operation_id: nil, interjection_id: nil, batch_key: nil, metadata: {} ) = Message.new(role: :user, content: ) if .is_a?(String) raise ArgumentError, "interject message must be a String or LittleGhost::Message" unless .is_a?(Message) safe_content = .content.all? do |content| content.is_a?(Content::Text) || content.is_a?(Content::Image) || content.is_a?(Content::Document) end unless safe_content raise ArgumentError, "interject message content must contain only text, images, or documents" end interjections = @interjections_mutex.synchronize do active = if target_operation_id @active_interjections.select { |candidate| candidate.target_operation_id == target_operation_id } else @active_interjections end if active.empty? raise AgentInterjectionError, "Agent is not currently running" end if active.length > 1 raise AgentInterjectionError, "Agent has multiple active invocations; the interjection target is ambiguous" end active.first end = {batch_key:, metadata:} [:id] = interjection_id unless interjection_id.nil? ticket = interjections.enqueue(, **) instrument( :agent_interjection_queued, parent_operation_id: interjections.operation_id, interjection_id: ticket.id, event_kind: :interjection, diagnostic: {input: ()} ) begin response = ticket.value(cancellation_token:, deadline:) interjections.release(ticket) response rescue => error interjections.release(ticket, withdraw: true) instrument( :agent_interjection_failed, parent_operation_id: interjections.operation_id, interjection_id: ticket.id, event_kind: :interjection, error_type: error.class.name, diagnostic: {exception: diagnostic_exception(error)} ) raise end end |
#prompt_locals ⇒ Object
Materializes and freezes the prompt locals declared on the agent class.
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# File 'lib/little_ghost/agent.rb', line 757 def prompt_locals self.class.prompt_local_resolvers.to_h do |name, resolver| value = if resolver.respond_to?(:call) resolver.parameters.empty? ? instance_exec(&resolver) : resolver.call(self) else resolver end [name, value] end.freeze end |
#request_assembly_transition(value, context:) ⇒ Object
:nodoc:
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# File 'lib/little_ghost/agent.rb', line 582 def request_assembly_transition(value, context:) # :nodoc: @assembly_transitions_mutex.synchronize do unless @assembly_tool_batch_sizes[context] == 1 raise ToolError, "An assembly transition must be the only tool call in a model response" end if @assembly_transitions.key?(context) raise ProtocolError, "Multiple assembly transitions were requested in one agent turn" end @assembly_transitions[context] = value end value end |
#stream(input = nil, history: nil, context: nil, cancellation_token: Support::CancellationToken.new, deadline: nil, settings: nil, template_locals: nil, template_paths: nil, parent_operation_id: nil, checkpoint: nil, conversation_id: nil, interjection_metadata: nil, interjection_ids: [], interject_ready: nil) ⇒ Object
Streams one invocation as StreamEvent objects.
Agents built inside a run accept history, JSON-like context, cancellation, deadlines, settings, and trusted invocation template paths. An agent instance may be streamed only according to the lifecycle managed by its owning run. Every template path must be an application-created TrustedPath; the wrapper records a trust decision and must never contain unchecked request or model input.
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# File 'lib/little_ghost/agent.rb', line 676 def stream( input = nil, history: nil, context: nil, cancellation_token: Support::CancellationToken.new, deadline: nil, settings: nil, template_locals: nil, template_paths: nil, parent_operation_id: nil, checkpoint: nil, conversation_id: nil, interjection_metadata: nil, interjection_ids: [], interject_ready: nil ) if standalone? raise ArgumentError, "input is required" if input.nil? return build_run(entrypoint_payload(input, { history:, context:, settings:, template_paths:, deadline_at: deadline, cancellation_token: }.compact)).each end raise ArgumentError, "input is required" if input.nil? history ||= [] context ||= {} settings ||= {} template_locals ||= {} template_paths ||= [] invocation_paths = Array(template_paths).map do |path| unless path.is_a?(LittleGhost::TrustedPath) raise ArgumentError, "invocation template paths must be LittleGhost::TrustedPath values" end path end settings = @model_settings.merge(settings) Enumerator.new do |events| interjections = AgentInterjections.new run_context = RunContext.new( state: context, cancellation_token: cancellation_token, deadline: deadline, metadata: {agent_id: self.class.agent_id}, checkpoint:, conversation_id:, interjection_metadata:, interjection_ids: ) begin with_invocation(run_context) do execute( input, history: history, context: run_context, settings: settings, template_locals: template_locals, template_paths: invocation_paths, events: events, parent_operation_id:, interjections:, interject_ready: ) end rescue => error interjections.close(error) raise ensure interjections.close(AgentInterjectionError.new("Agent finished before the interjection was delivered")) unregister_interjections(interjections) end end end |
#tools ⇒ Object
The materialized tools available during this agent run.
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# File 'lib/little_ghost/agent.rb', line 769 def tools = tool_registry |