Claude Platform Docs

Create Agent

$ ant beta:agents create
POST/v1/agents

Create Agent

Parameters
--model: BetaManagedAgentsModel or BetaManagedAgentsModelConfigParams

Model identifier. Accepts the model string, e.g. claude-opus-5-5, or a model_config object for additional configuration control

--name: string

Human-readable name for the agent.

minLength1
maxLength256
--description: optional string

Description of what the agent does.

maxLength2048
--mcp-server: optional array of BetaManagedAgentsURLMCPServerParams { type: "url", name, url }

MCP servers this agent connects to. Maximum 20. Names must be unique within the array. Every server must be referenced by an mcp_toolset in tools; unreferenced servers are rejected. See the MCP connector guide.

--metadata: optional map[string]

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

--multiagent: optional BetaManagedAgentsMultiagentCoordinatorParams or BetaManagedAgentsMultiagent20261001Params

Multiagent orchestration configuration.

--skill: optional array of BetaManagedAgentsSkillParams

Skills available to the agent.

--system: optional string

System prompt for the agent.

maxLength100000
--tool: optional array of BetaManagedAgentsAgentToolset20260401Params or BetaManagedAgentsMCPToolsetParams or BetaManagedAgentsCustomToolParams

Tool configurations available to the agent. Maximum of 256 tools across all toolsets allowed.

--beta: optional array of AnthropicBeta⁠Header parameter

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

--workspace-id: optional string⁠Header parameter

Optional header to select the Workspace for this request. The value is a Workspace ID (for example, wrkspc_011CZkZaBF1tNoB5wlCeusgy).

Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace.

Returns
beta_managed_agents_agent: object{ type: "agent", id, archived_at, 12 more }

A Managed Agents agent.

type: "agent"
id: string
archived_at: string

When the agent was archived. Null if not archived.

formatdate-time
created_at: string

A timestamp in RFC 3339 format

formatdate-time
description: string
mcp_servers: array of BetaManagedAgentsMCPServerURLDefinition { type: "url", name, url }
type: "url"
name: string
url: string
metadata: map[string]
model: object{ id, effort, inference_geo, speed }

Model identifier and configuration.

id: "claude-haiku-5-5" or "claude-sonnet-5-5" or "claude-opus-5-5" or 14 more or string

The model that will power your agent.

See models for additional details and options.

One of the following:
"claude-haiku-5-5"

Fastest model for high-volume, real-time tasks

"claude-sonnet-5-5"

Efficient model for coding and agents

"claude-opus-5-5"

Powerful intelligence for coding, knowledge work, and long-running agents

"claude-fable-5-1"

Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows

"claude-sonnet-5"

Efficient model for coding and agents

"claude-fable-5"

Next generation of intelligence for the hardest knowledge work and coding problems

"claude-opus-5"

Powerful intelligence for long-running agents and coding

"claude-opus-4-8"

Powerful intelligence for long-running agents and coding

"claude-opus-4-7"

Powerful intelligence for long-running agents and coding

"claude-opus-4-6"

Powerful intelligence for long-running agents and coding

"claude-sonnet-4-6"

Best combination of speed and intelligence

"claude-haiku-4-5"
"claude-haiku-4-5-20251001"
"claude-opus-4-5"

Powerful intelligence for long-running agents and coding

"claude-opus-4-5-20251101"

Powerful intelligence for long-running agents and coding

"claude-sonnet-4-5"⁠Deprecated

High-performance model for agents and coding

Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
"claude-sonnet-4-5-20250929"⁠Deprecated

High-performance model for agents and coding

Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.
effort: optional BetaManagedAgentsEffortLow or BetaManagedAgentsEffortMedium or BetaManagedAgentsEffortHigh or 2 more

How hard Claude works on each inference call. One of low, medium, high, xhigh, max. Always present; resolved to the per-model default at save time when not supplied.

One of the following:
beta_managed_agents_effort_low: object{ type: "low" }

Low effort. Favors latency over reasoning depth.

type: "low"
beta_managed_agents_effort_medium: object{ type: "medium" }

Medium effort. Balances latency and reasoning depth.

type: "medium"
beta_managed_agents_effort_high: object{ type: "high" }

High effort. Favors reasoning depth.

type: "high"
beta_managed_agents_effort_xhigh: object{ type: "xhigh" }

Extra-high effort. Not all models accept this level.

type: "xhigh"
beta_managed_agents_effort_max: object{ type: "max" }

Maximum effort. Favors reasoning depth over latency.

type: "max"
inference_geo: optional string

Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo.

speed: optional "standard" or "fast"

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

One of the following:
"standard"
"fast"
multiagent: BetaManagedAgentsMultiagentCoordinator or BetaManagedAgentsMultiagent20261001

Multiagent orchestration configuration. Null when the agent is single-threaded.

One of the following:
beta_managed_agents_multiagent_coordinator: object{ type: "coordinator", agents }

Resolved coordinator topology with a concrete agent roster.

type: "coordinator"
agents: array of BetaManagedAgentsAgentReference or BetaManagedAgentsAdvisor

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

One of the following:
beta_managed_agents_agent_reference: object{ type: "agent", id, version }

A resolved agent reference with a concrete version.

type: "agent"
id: string
version: number
formatint32
beta_managed_agents_advisor: object{ type: "advisor", model }

Platform advisor roster entry: a model the session's primary thread may consult mid-turn.

type: "advisor"
model: string

The advisor model id.

beta_managed_agents_multiagent20261001: object{ type: "multiagent_20261001", advisor, subagents, workflows }

Resolved multiagent configuration with three members, each enabled or disabled on its own.

type: "multiagent_20261001"
advisor: BetaManagedAgentsMultiagentAdvisorEnabled or BetaManagedAgentsMultiagentAdvisorDisabled

Whether the session's primary thread can consult an advisor model.

One of the following:
beta_managed_agents_multiagent_advisor_enabled: object{ type: "enabled", model }

The session's primary thread can consult model mid-turn.

type: "enabled"
model: string

The advisor model id.

beta_managed_agents_multiagent_advisor_disabled: object{ type: "disabled" }

The agent has no advisor.

type: "disabled"
subagents: BetaManagedAgentsMultiagentSubagentsEnabled or BetaManagedAgentsMultiagentSubagentsDisabled

Whether the agent can spawn session threads.

One of the following:
beta_managed_agents_multiagent_subagents_enabled: object{ type: "enabled", inline_agents, predefined_agents }

The agent can spawn session threads.

type: "enabled"
inline_agents: BetaManagedAgentsMultiagentInlineAgentsEnabled or BetaManagedAgentsMultiagentInlineAgentsDisabled

Whether the agent can define inline agents, which are not saved, when it spawns session threads.

One of the following:
beta_managed_agents_multiagent_inline_agents_enabled: object{ type: "enabled" }

The agent can define inline agents.

type: "enabled"
beta_managed_agents_multiagent_inline_agents_disabled: object{ type: "disabled" }

The agent cannot define inline agents.

type: "disabled"
predefined_agents: array of BetaManagedAgentsAgentReference { type: "agent", id, version }

Predefined agents, which are saved agents that this agent can spawn as session threads, each resolved to a specific version.

type: "agent"
id: string
version: number
formatint32
beta_managed_agents_multiagent_subagents_disabled: object{ type: "disabled" }

The agent cannot spawn session threads.

type: "disabled"
workflows: BetaManagedAgentsMultiagentWorkflowsEnabled or BetaManagedAgentsMultiagentWorkflowsDisabled

Whether the agent can start workflow runs.

One of the following:
beta_managed_agents_multiagent_workflows_enabled: object{ type: "enabled", inline_agents, predefined_agents }

The agent can start workflow runs.

type: "enabled"
inline_agents: BetaManagedAgentsMultiagentInlineAgentsEnabled or BetaManagedAgentsMultiagentInlineAgentsDisabled

Whether a run's plan can define inline agents, which are not saved.

One of the following:
beta_managed_agents_multiagent_inline_agents_enabled: object{ type: "enabled" }

The agent can define inline agents.

type: "enabled"
beta_managed_agents_multiagent_inline_agents_disabled: object{ type: "disabled" }

The agent cannot define inline agents.

type: "disabled"
predefined_agents: array of BetaManagedAgentsAgentReference { type: "agent", id, version }

Predefined agents, which are saved agents that a run's plan can use, each resolved to a specific version.

type: "agent"
id: string
version: number
formatint32
beta_managed_agents_multiagent_workflows_disabled: object{ type: "disabled" }

The agent cannot start workflow runs.

type: "disabled"
name: string
skills: array of BetaManagedAgentsAnthropicSkill or BetaManagedAgentsCustomSkill
One of the following:
beta_managed_agents_anthropic_skill: object{ type: "anthropic", skill_id, version }

A resolved Anthropic-managed skill.

type: "anthropic"
skill_id: string
version: string
beta_managed_agents_custom_skill: object{ type: "custom", skill_id, version }

A resolved user-created custom skill.

type: "custom"
skill_id: string
version: string
system: string
tools: array of BetaManagedAgentsAgentToolset20260401 or BetaManagedAgentsMCPToolset or BetaManagedAgentsCustomTool
One of the following:
beta_managed_agents_agent_toolset20260401: object{ type: "agent_toolset_20260401", configs, default_config }
beta_managed_agents_mcp_toolset: object{ type: "mcp_toolset", configs, default_config, mcp_server_name }
beta_managed_agents_custom_tool: object{ type: "custom", description, input_schema, name }

A custom tool as returned in API responses.

type: "custom"
description: string
input_schema: object{ type: "object", properties, required }

JSON Schema for custom tool input parameters.

type: "object"
properties: optional map[unknown]
required: optional array of string
name: string
updated_at: string

A timestamp in RFC 3339 format

formatdate-time
version: number

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

formatint32
Create Agent
ant beta:agents create \
  --api-key my-anthropic-api-key \
  --model claude-opus-5-5 \
  --name 'My First Agent'
Returns Examples
Response 200
{
  "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-opus-5-5",
    "effort": {
      "type": "low"
    },
    "inference_geo": "inference_geo",
    "speed": "standard"
  },
  "multiagent": {
    "advisor": {
      "type": "disabled"
    },
    "subagents": {
      "inline_agents": {
        "type": "enabled"
      },
      "predefined_agents": [
        {
          "id": "agent_011CZkYqphY8vELVzwCUpqiQ",
          "type": "agent",
          "version": 1
        }
      ],
      "type": "enabled"
    },
    "type": "multiagent_20261001",
    "workflows": {
      "inline_agents": {
        "type": "enabled"
      },
      "predefined_agents": [
        {
          "id": "agent_011CZkYqphY8vELVzwCUpqiQ",
          "type": "agent",
          "version": 1
        }
      ],
      "type": "enabled"
    }
  },
  "name": "My First Agent",
  "skills": [
    {
      "skill_id": "xlsx",
      "type": "anthropic",
      "version": "1"
    },
    {
      "skill_id": "skill_011CZkZFNu9hAbo3jZPRgTmx",
      "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"
          },
          "type": "bash"
        }
      ],
      "default_config": {
        "enabled": true,
        "permission_policy": {
          "type": "always_ask"
        }
      },
      "type": "agent_toolset_20260401"
    }
  ],
  "type": "agent",
  "updated_at": "2026-03-15T10:00:00Z",
  "version": 1
}