Golem Create Agent Instance Effect

Creating an Effect Golem Agent Instance with golem agent new

Both golem and golem-cli can be used — all commands below work with either binary.

Usage

golem agent new <AGENT_ID> [OPTIONS]

This creates a new agent instance without invoking any method on it. The agent is initialized with its agent id fields and starts idle, ready to receive invocations. If the agent's component has not been deployed and the CLI is run from an application directory, the command automatically builds and deploys the component first.

Unlike golem agent invoke, which implicitly creates an agent on its first call, golem agent new explicitly pre-creates it. Use this when environment variables or typed configuration must be supplied before any invocation.

The Effect SDK has no ordinary programmatic create-agent helper. Do not replace this command with a typed RPC client or newPhantom; those APIs serve different purposes.

Agent ID Format

The agent ID identifies the agent type and its agent id fields:

AgentTypeName(param1, param2, ...)

For an Effect agent declared with defineAgent, use the exact name string as AgentTypeName and pass values in the declaration order of id. Do not infer the type name from the exported TypeScript constant, filename, or description, and do not append an Agent suffix unless it is present in name.

For example, this declaration is addressed as Counter("c1"), not CounterAgent("c1"):

export const Counter = defineAgent({
  name: "Counter",
  id: { name: Schema.String },
  // ...
});

Before creating an instance, inspect the agent's defineAgent declaration or discover deployed constructors with golem agent-type list and golem agent-type get <AGENT_TYPE>. If the CLI reports that a type is not found, use the exact name from its list of available deployed constructors.

The agent ID can optionally be prefixed with environment or application paths:

For agents with no agent id fields, use empty parentheses: AgentTypeName().

Examples

Create an agent with no agent id fields

golem agent new 'MyAgent()'

Create an agent with agent id fields

golem agent new 'Counter("c1")'

Create an agent with environment variables

golem agent new 'MyAgent("user-123")' --env API_KEY=[REDACTED:api-key] --env LOG_LEVEL=debug

Create an agent with configuration

golem agent new 'MyAgent()' --config maxRetries=5 --config timeoutSeconds=30

Create an agent in a specific environment

golem agent new 'staging/MyAgent("user-123")'

Combine environment variables and configuration

golem agent new 'OrderProcessor("us-east")' \
  --env DATABASE_URL=postgres://... \
  --config batchSize=100 \
  --config retryPolicy.maxAttempts=3

Available Options

Auto-Deploy

When run from an application directory, golem agent new automatically builds and deploys an agent component that has not been deployed yet.

Verify Creation Without Invoking a Method

Use golem agent get with the same agent ID to verify that the pre-created instance exists:

golem agent get 'Counter("c1")'

A successful metadata lookup verifies existence without calling an agent method. Do not require a particular textual entry from golem agent oplog: pre-creation does not guarantee that the CLI's rendered oplog contains a create line.

Effect CLI Value Syntax

Effect components are reported as TypeScript source, so constructor values use TypeScript syntax, even though the agent implementation uses Effect Schema:

• Field names use camelCase
• Options: raw value or undefined
• Records: { fieldOne: 1, fieldTwo: "hello" }
• Enums: "variant-name"
• Variants: { tag: "variant-name", value: 42 }
• Tuples: [1, "hello"]
• Results: { ok: value } / { error: value }

golem agent new 'UserManager({ region: "us-east", maxConnections: 10 })'

These are CLI expressions, not in-process Effect values. Do not put Option.some(...), Result.succeed(...), or an Effect Schema tagged-union object into the shell command.

Quote agent IDs containing parentheses, strings, objects, or spaces so the shell passes the entire ID as one argument.

When to Use golem agent new vs golem agent invoke

• Use golem agent new to pre-create an agent with specific environment variables or configuration before any invocation.
• Use golem agent invoke to call a method; a durable agent is created automatically on first invocation if it does not exist.
• Invoke a pre-created agent later with the same agent ID.