## Create Agent

`$ ant beta:agents create`

**post** `/v1/agents`

Create Agent

### Parameters

- `--model: BetaManagedAgentsModelConfigParams`

  Body param: Model identifier. Accepts the [model string](https://platform.claude.com/docs/en/about-claude/models/overview#latest-models-comparison), e.g. `claude-opus-4-6`, or a `model_config` object for additional configuration control

- `--name: string`

  Body param: Human-readable name for the agent. 1-256 characters.

- `--description: optional string`

  Body param: Description of what the agent does. Up to 2048 characters.

- `--mcp-server: optional array of BetaManagedAgentsURLMCPServerParams`

  Body param: MCP servers this agent connects to. Maximum 20. Names must be unique within the array.

- `--metadata: optional map[string]`

  Body param: Arbitrary key-value metadata. Maximum 16 pairs, keys up to 64 chars, values up to 512 chars.

- `--multiagent: optional object { agents, type }`

  Body param: A coordinator topology: the session's primary thread orchestrates work by spawning session threads, each running an agent drawn from the `agents` roster.

- `--skill: optional array of BetaManagedAgentsSkillParams`

  Body param: Skills available to the agent. Maximum 20.

- `--system: optional string`

  Body param: System prompt for the agent. Up to 100,000 characters.

- `--tool: optional array of BetaManagedAgentsAgentToolset20260401Params or BetaManagedAgentsMCPToolsetParams or BetaManagedAgentsCustomToolParams`

  Body param: Tool configurations available to the agent. Maximum of 128 tools across all toolsets allowed.

- `--beta: optional array of AnthropicBeta`

  Header param: Optional header to specify the beta version(s) you want to use.

### Returns

- `beta_managed_agents_agent: object { id, archived_at, created_at, 12 more }`

  A Managed Agents `agent`.

  - `id: string`

  - `archived_at: string`

    A timestamp in RFC 3339 format

  - `created_at: string`

    A timestamp in RFC 3339 format

  - `description: string`

  - `mcp_servers: array of BetaManagedAgentsMCPServerURLDefinition`

    - `name: string`

    - `type: "url"`

      - `"url"`

    - `url: string`

  - `metadata: map[string]`

  - `model: object { id, speed }`

    Model identifier and configuration.

    - `id: "claude-opus-4-8" or "claude-opus-4-7" or "claude-opus-4-6" or 7 more or string`

      The model that will power your agent.

      See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.

      - `"claude-opus-4-8"`

        Frontier intelligence for long-running agents and coding

      - `"claude-opus-4-7"`

        Frontier intelligence for long-running agents and coding

      - `"claude-opus-4-6"`

        Most intelligent model for building agents and coding

      - `"claude-sonnet-4-6"`

        Best combination of speed and intelligence

      - `"claude-haiku-4-5"`

        Fastest model with near-frontier intelligence

      - `"claude-haiku-4-5-20251001"`

        Fastest model with near-frontier intelligence

      - `"claude-opus-4-5"`

        Premium model combining maximum intelligence with practical performance

      - `"claude-opus-4-5-20251101"`

        Premium model combining maximum intelligence with practical performance

      - `"claude-sonnet-4-5"`

        High-performance model for agents and coding

      - `"claude-sonnet-4-5-20250929"`

        High-performance model for agents and coding

    - `speed: optional "standard" or "fast"`

      Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time.

      - `"standard"`

      - `"fast"`

  - `multiagent: object { agents, type }`

    Resolved coordinator topology with a concrete agent roster.

    - `agents: array of BetaManagedAgentsAgentReference`

      Agents the coordinator may spawn as session threads, each resolved to a specific version.

      - `id: string`

      - `type: "agent"`

        - `"agent"`

      - `version: number`

    - `type: "coordinator"`

      - `"coordinator"`

  - `name: string`

  - `skills: array of BetaManagedAgentsAnthropicSkill or BetaManagedAgentsCustomSkill`

    - `beta_managed_agents_anthropic_skill: object { skill_id, type, version }`

      A resolved Anthropic-managed skill.

      - `skill_id: string`

      - `type: "anthropic"`

        - `"anthropic"`

      - `version: string`

    - `beta_managed_agents_custom_skill: object { skill_id, type, version }`

      A resolved user-created custom skill.

      - `skill_id: string`

      - `type: "custom"`

        - `"custom"`

      - `version: string`

  - `system: string`

  - `tools: array of BetaManagedAgentsAgentToolset20260401 or BetaManagedAgentsMCPToolset or BetaManagedAgentsCustomTool`

    - `beta_managed_agents_agent_toolset20260401: object { configs, default_config, type }`

      - `configs: array of BetaManagedAgentsAgentToolConfig`

        - `enabled: boolean`

        - `name: "bash" or "edit" or "read" or 5 more`

          Built-in agent tool identifier.

          - `"bash"`

          - `"edit"`

          - `"read"`

          - `"write"`

          - `"glob"`

          - `"grep"`

          - `"web_fetch"`

          - `"web_search"`

        - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy`

          Permission policy for tool execution.

          - `beta_managed_agents_always_allow_policy: object { type }`

            Tool calls are automatically approved without user confirmation.

            - `type: "always_allow"`

              - `"always_allow"`

          - `beta_managed_agents_always_ask_policy: object { type }`

            Tool calls require user confirmation before execution.

            - `type: "always_ask"`

              - `"always_ask"`

      - `default_config: object { enabled, permission_policy }`

        Resolved default configuration for agent tools.

        - `enabled: boolean`

        - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy`

          Permission policy for tool execution.

          - `beta_managed_agents_always_allow_policy: object { type }`

            Tool calls are automatically approved without user confirmation.

          - `beta_managed_agents_always_ask_policy: object { type }`

            Tool calls require user confirmation before execution.

      - `type: "agent_toolset_20260401"`

        - `"agent_toolset_20260401"`

    - `beta_managed_agents_mcp_toolset: object { configs, default_config, mcp_server_name, type }`

      - `configs: array of BetaManagedAgentsMCPToolConfig`

        - `enabled: boolean`

        - `name: string`

        - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy`

          Permission policy for tool execution.

          - `beta_managed_agents_always_allow_policy: object { type }`

            Tool calls are automatically approved without user confirmation.

          - `beta_managed_agents_always_ask_policy: object { type }`

            Tool calls require user confirmation before execution.

      - `default_config: object { enabled, permission_policy }`

        Resolved default configuration for all tools from an MCP server.

        - `enabled: boolean`

        - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy`

          Permission policy for tool execution.

          - `beta_managed_agents_always_allow_policy: object { type }`

            Tool calls are automatically approved without user confirmation.

          - `beta_managed_agents_always_ask_policy: object { type }`

            Tool calls require user confirmation before execution.

      - `mcp_server_name: string`

      - `type: "mcp_toolset"`

        - `"mcp_toolset"`

    - `beta_managed_agents_custom_tool: object { description, input_schema, name, type }`

      A custom tool as returned in API responses.

      - `description: string`

      - `input_schema: object { properties, required, type }`

        JSON Schema for custom tool input parameters.

        - `properties: optional map[unknown]`

          JSON Schema properties defining the tool's input parameters.

        - `required: optional array of string`

          List of required property names.

        - `type: optional "object"`

          Must be 'object' for tool input schemas.

          - `"object"`

      - `name: string`

      - `type: "custom"`

        - `"custom"`

  - `type: "agent"`

    - `"agent"`

  - `updated_at: string`

    A timestamp in RFC 3339 format

  - `version: number`

    The agent's current version. Starts at 1 and increments when the agent is modified.

### Example

```cli
ant beta:agents create \
  --api-key my-anthropic-api-key \
  --model '{id: claude-opus-4-6}' \
  --name 'My First Agent'
```

#### Response

```json
{
  "id": "agent_011CZkYpogX7uDKUyvBTophP",
  "archived_at": null,
  "created_at": "2026-03-15T10:00:00Z",
  "description": "A general-purpose starter agent.",
  "mcp_servers": [
    {
      "name": "example-mcp",
      "type": "url",
      "url": "https://example-server.modelcontextprotocol.io/sse"
    }
  ],
  "metadata": {
    "foo": "bar"
  },
  "model": {
    "id": "claude-sonnet-4-6",
    "speed": "standard"
  },
  "multiagent": {
    "agents": [
      {
        "id": "agent_011CZkYqphY8vELVzwCUpqiQ",
        "type": "agent",
        "version": 1
      }
    ],
    "type": "coordinator"
  },
  "name": "My First Agent",
  "skills": [
    {
      "skill_id": "xlsx",
      "type": "anthropic",
      "version": "1"
    },
    {
      "skill_id": "skill_011CZkZFNu9hAbo3jZPRgTlx",
      "type": "custom",
      "version": "2"
    }
  ],
  "system": "You are a general-purpose agent that can research, write code, run commands, and use connected tools to complete the user's task end to end.",
  "tools": [
    {
      "configs": [
        {
          "enabled": true,
          "name": "bash",
          "permission_policy": {
            "type": "always_allow"
          }
        }
      ],
      "default_config": {
        "enabled": true,
        "permission_policy": {
          "type": "always_ask"
        }
      },
      "type": "agent_toolset_20260401"
    }
  ],
  "type": "agent",
  "updated_at": "2026-03-15T10:00:00Z",
  "version": 1
}
```