## Create Agent `beta.agents.create(**kwargs) -> BetaManagedAgentsAgent` **post** `/v1/agents` Create Agent ### Parameters - `model: BetaManagedAgentsModel | BetaManagedAgentsModelConfigParams` 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. - `BetaManagedAgentsModel = :"claude-opus-4-8" | :"claude-opus-4-7" | :"claude-opus-4-6" | 7 more` 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 - `String = String` - `class 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` 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` Human-readable name for the agent. 1-256 characters. - `description: String` Description of what the agent does. Up to 2048 characters. - `mcp_servers: Array[BetaManagedAgentsURLMCPServerParams]` 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: Hash[Symbol, String]` Arbitrary key-value metadata. Maximum 16 pairs, keys up to 64 chars, values up to 512 chars. - `multiagent: BetaManagedAgentsMultiagentParams` 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[BetaManagedAgentsMultiagentRosterEntryParams]` 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 = String` - `class 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: Integer` The specific `agent` version to use. Omit to use the latest version. Must be at least 1 if specified. - `class 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[BetaManagedAgentsSkillParams]` Skills available to the agent. Maximum 20. - `class BetaManagedAgentsAnthropicSkillParams` An Anthropic-managed skill. - `skill_id: String` Identifier of the Anthropic skill (e.g., "xlsx"). - `type: :anthropic` - `:anthropic` - `version: String` Version to pin. Defaults to latest if omitted. - `class BetaManagedAgentsCustomSkillParams` A user-created custom skill. - `skill_id: String` Tagged ID of the custom skill (e.g., "skill_01XJ5..."). - `type: :custom` - `:custom` - `version: String` Version to pin. Defaults to latest if omitted. - `system_: String` System prompt for the agent. Up to 100,000 characters. - `tools: Array[BetaManagedAgentsAgentToolset20260401Params | BetaManagedAgentsMCPToolsetParams | BetaManagedAgentsCustomToolParams]` Tool configurations available to the agent. Maximum of 128 tools across all toolsets allowed. - `class 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[BetaManagedAgentsAgentToolConfigParams]` 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: bool` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: :always_allow` - `:always_allow` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: :always_ask` - `:always_ask` - `default_config: BetaManagedAgentsAgentToolsetDefaultConfigParams` Default configuration for all tools in a toolset. - `enabled: bool` Whether tools are enabled and available to Claude by default. Defaults to true if not specified. - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class 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[BetaManagedAgentsMCPToolConfigParams]` Per-tool configuration overrides. - `name: String` Name of the MCP tool to configure. 1-128 characters. - `enabled: bool` Whether this tool is enabled. Overrides the `default_config` setting. - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfigParams` Default configuration for all tools from an MCP server. - `enabled: bool` Whether tools are enabled by default. Defaults to true if not specified. - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class 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: Hash[Symbol, untyped]` JSON Schema properties defining the tool's input parameters. - `required: Array[String]` 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[AnthropicBeta]` Optional header to specify the beta version(s) you want to use. - `String = String` - `AnthropicBeta = :"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 - `class BetaManagedAgentsAgent` A Managed Agents `agent`. - `id: String` - `archived_at: Time` A timestamp in RFC 3339 format - `created_at: Time` A timestamp in RFC 3339 format - `description: String` - `mcp_servers: Array[BetaManagedAgentsMCPServerURLDefinition]` - `name: String` - `type: :url` - `:url` - `url: String` - `metadata: Hash[Symbol, String]` - `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. - `BetaManagedAgentsModel = :"claude-opus-4-8" | :"claude-opus-4-7" | :"claude-opus-4-6" | 7 more` 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 - `String = 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` Resolved coordinator topology with a concrete agent roster. - `agents: Array[BetaManagedAgentsAgentReference]` Agents the coordinator may spawn as session threads, each resolved to a specific version. - `id: String` - `type: :agent` - `:agent` - `version: Integer` - `type: :coordinator` - `:coordinator` - `name: String` - `skills: Array[BetaManagedAgentsAnthropicSkill | BetaManagedAgentsCustomSkill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `skill_id: String` - `type: :anthropic` - `:anthropic` - `version: String` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `skill_id: String` - `type: :custom` - `:custom` - `version: String` - `system_: String` - `tools: Array[BetaManagedAgentsAgentToolset20260401 | BetaManagedAgentsMCPToolset | BetaManagedAgentsCustomTool]` - `class BetaManagedAgentsAgentToolset20260401` - `configs: Array[BetaManagedAgentsAgentToolConfig]` - `enabled: bool` - `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. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: :always_allow` - `:always_allow` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: :always_ask` - `:always_ask` - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: :agent_toolset_20260401` - `:agent_toolset_20260401` - `class BetaManagedAgentsMCPToolset` - `configs: Array[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: String` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `mcp_server_name: String` - `type: :mcp_toolset` - `:mcp_toolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `description: String` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `properties: Hash[Symbol, untyped]` JSON Schema properties defining the tool's input parameters. - `required: Array[String]` 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: Time` A timestamp in RFC 3339 format - `version: Integer` The agent's current version. Starts at 1 and increments when the agent is modified. ### Example ```ruby require "anthropic" anthropic = Anthropic::Client.new(api_key: "my-anthropic-api-key") beta_managed_agents_agent = anthropic.beta.agents.create(model: :"claude-sonnet-4-6", name: "My First Agent") puts(beta_managed_agents_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 } ```