## Create Agent `client.beta.agents.create(AgentCreateParamsparams, RequestOptionsoptions?): BetaManagedAgentsAgent` **post** `/v1/agents` Create Agent ### Parameters - `params: AgentCreateParams` - `model: BetaManagedAgentsModel | 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 - `BetaManagedAgentsModel = "claude-opus-4-8" | "claude-opus-4-7" | "claude-opus-4-6" | 7 more | (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" | "claude-opus-4-7" | "claude-opus-4-6" | 7 more` - `"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 - `(string & {})` - `BetaManagedAgentsModelConfigParams` An object that defines additional configuration control over model use - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `speed?: "standard" | "fast" | null` 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"` - `name: string` Body param: Human-readable name for the agent. 1-256 characters. - `description?: string | null` Body param: Description of what the agent does. Up to 2048 characters. - `mcp_servers?: Array` Body param: MCP servers this agent connects to. Maximum 20. Names must be unique within the array. - `name: string` Unique name for this server, referenced by mcp_toolset configurations. 1-255 characters. - `type: "url"` - `"url"` - `url: string` Endpoint URL for the MCP server. - `metadata?: Record` Body param: Arbitrary key-value metadata. Maximum 16 pairs, keys up to 64 chars, values up to 512 chars. - `multiagent?: BetaManagedAgentsMultiagentParams | null` 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. - `agents: Array` Agents the coordinator may spawn as session threads. 1–20 entries. Each entry is an agent ID string, a versioned `{"type":"agent","id","version"}` reference, or `{"type":"self"}` to allow recursive self-invocation. Entries must reference distinct agents (after resolving `self` and string forms); at most one `self`. Referenced agents must exist, must not be archived, and must not themselves have `multiagent` set (depth limit 1). - `string` - `BetaManagedAgentsAgentParams` Specification for an Agent. Provide a specific `version` or use the short-form `agent="agent_id"` for the most recent version - `id: string` The `agent` ID. - `type: "agent"` - `"agent"` - `version?: number` The specific `agent` version to use. Omit to use the latest version. Must be at least 1 if specified. - `BetaManagedAgentsMultiagentSelfParams` Sentinel roster entry meaning "the agent that owns this configuration". Resolved server-side to a concrete agent reference. - `type: "self"` - `"self"` - `type: "coordinator"` - `"coordinator"` - `skills?: Array` Body param: Skills available to the agent. Maximum 20. - `BetaManagedAgentsAnthropicSkillParams` An Anthropic-managed skill. - `skill_id: string` Identifier of the Anthropic skill (e.g., "xlsx"). - `type: "anthropic"` - `"anthropic"` - `version?: string | null` Version to pin. Defaults to latest if omitted. - `BetaManagedAgentsCustomSkillParams` A user-created custom skill. - `skill_id: string` Tagged ID of the custom skill (e.g., "skill_01XJ5..."). - `type: "custom"` - `"custom"` - `version?: string | null` Version to pin. Defaults to latest if omitted. - `system?: string | null` Body param: System prompt for the agent. Up to 100,000 characters. - `tools?: Array` Body param: Tool configurations available to the agent. Maximum of 128 tools across all toolsets allowed. - `BetaManagedAgentsAgentToolset20260401Params` Configuration for built-in agent tools. Use this to enable or disable groups of tools available to the agent. - `type: "agent_toolset_20260401"` - `"agent_toolset_20260401"` - `configs?: Array` Per-tool configuration overrides. - `name: "bash" | "edit" | "read" | 5 more` Built-in agent tool identifier. - `"bash"` - `"edit"` - `"read"` - `"write"` - `"glob"` - `"grep"` - `"web_fetch"` - `"web_search"` - `enabled?: boolean | null` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy?: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy | null` Permission policy for tool execution. - `BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: "always_allow"` - `"always_allow"` - `BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: "always_ask"` - `"always_ask"` - `default_config?: BetaManagedAgentsAgentToolsetDefaultConfigParams | null` Default configuration for all tools in a toolset. - `enabled?: boolean | null` Whether tools are enabled and available to Claude by default. Defaults to true if not specified. - `permission_policy?: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy | null` Permission policy for tool execution. - `BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `BetaManagedAgentsMCPToolsetParams` Configuration for tools from an MCP server defined in `mcp_servers`. - `mcp_server_name: string` Name of the MCP server. Must match a server name from the mcp_servers array. 1-255 characters. - `type: "mcp_toolset"` - `"mcp_toolset"` - `configs?: Array` Per-tool configuration overrides. - `name: string` Name of the MCP tool to configure. 1-128 characters. - `enabled?: boolean | null` Whether this tool is enabled. Overrides the `default_config` setting. - `permission_policy?: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy | null` Permission policy for tool execution. - `BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `default_config?: BetaManagedAgentsMCPToolsetDefaultConfigParams | null` Default configuration for all tools from an MCP server. - `enabled?: boolean | null` Whether tools are enabled by default. Defaults to true if not specified. - `permission_policy?: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy | null` Permission policy for tool execution. - `BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `BetaManagedAgentsCustomToolParams` A custom tool that is executed by the API client rather than the agent. When the agent calls this tool, an `agent.custom_tool_use` event is emitted and the session goes idle, waiting for the client to provide the result via a `user.custom_tool_result` event. - `description: string` Description of what the tool does, shown to the agent to help it decide when to use the tool. 1-1024 characters. - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `properties?: Record | null` JSON Schema properties defining the tool's input parameters. - `required?: Array` List of required property names. - `type?: "object"` Must be 'object' for tool input schemas. - `"object"` - `name: string` Unique name for the tool. 1-128 characters; letters, digits, underscores, and hyphens. - `type: "custom"` - `"custom"` - `betas?: Array` Header param: Optional header to specify the beta version(s) you want to use. - `(string & {})` - `"message-batches-2024-09-24" | "prompt-caching-2024-07-31" | "computer-use-2024-10-22" | 23 more` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"thinking-token-count-2026-05-13"` ### Returns - `BetaManagedAgentsAgent` A Managed Agents `agent`. - `id: string` - `archived_at: string | null` A timestamp in RFC 3339 format - `created_at: string` A timestamp in RFC 3339 format - `description: string | null` - `mcp_servers: Array` - `name: string` - `type: "url"` - `"url"` - `url: string` - `metadata: Record` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` 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" | "claude-opus-4-7" | "claude-opus-4-6" | 7 more` - `"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 - `(string & {})` - `speed?: "standard" | "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: BetaManagedAgentsMultiagent | null` Resolved coordinator topology with a concrete agent roster. - `agents: Array` 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` - `BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `skill_id: string` - `type: "anthropic"` - `"anthropic"` - `version: string` - `BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `skill_id: string` - `type: "custom"` - `"custom"` - `version: string` - `system: string | null` - `tools: Array` - `BetaManagedAgentsAgentToolset20260401` - `configs: Array` - `enabled: boolean` - `name: "bash" | "edit" | "read" | 5 more` Built-in agent tool identifier. - `"bash"` - `"edit"` - `"read"` - `"write"` - `"glob"` - `"grep"` - `"web_fetch"` - `"web_search"` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: "always_allow"` - `"always_allow"` - `BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: "always_ask"` - `"always_ask"` - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: boolean` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: "agent_toolset_20260401"` - `"agent_toolset_20260401"` - `BetaManagedAgentsMCPToolset` - `configs: Array` - `enabled: boolean` - `name: string` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: boolean` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `mcp_server_name: string` - `type: "mcp_toolset"` - `"mcp_toolset"` - `BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `description: string` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `properties?: Record | null` JSON Schema properties defining the tool's input parameters. - `required?: Array` List of required property names. - `type?: "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 ```typescript import Anthropic from '@anthropic-ai/sdk'; const client = new Anthropic({ apiKey: process.env['ANTHROPIC_API_KEY'], // This is the default and can be omitted }); const betaManagedAgentsAgent = await client.beta.agents.create({ model: 'claude-sonnet-4-6', name: 'My First Agent', }); console.log(betaManagedAgentsAgent.id); ``` #### 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 } ```