## Archive Session Thread

`beta.sessions.threads.archive(thread_id, **kwargs) -> BetaManagedAgentsSessionThread`

**post** `/v1/sessions/{session_id}/threads/{thread_id}/archive`

Archive Session Thread

### Parameters

- `session_id: String`

- `thread_id: String`

- `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 BetaManagedAgentsSessionThread`

  An execution thread within a `session`. Each session has one primary thread plus zero or more child threads spawned by the coordinator.

  - `id: String`

    Unique identifier for this thread.

  - `agent: BetaManagedAgentsSessionThreadAgent`

    Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`.

    - `id: String`

    - `description: String`

    - `mcp_servers: Array[BetaManagedAgentsMCPServerURLDefinition]`

      - `name: String`

      - `type: :url`

        - `:url`

      - `url: 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`

    - `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`

    - `version: Integer`

  - `archived_at: Time`

    A timestamp in RFC 3339 format

  - `created_at: Time`

    A timestamp in RFC 3339 format

  - `parent_thread_id: String`

    Parent thread that spawned this thread. Null for the primary thread.

  - `session_id: String`

    The session this thread belongs to.

  - `stats: BetaManagedAgentsSessionThreadStats`

    Timing statistics for a session thread.

    - `active_seconds: Float`

      Cumulative time in seconds the thread spent actively running. Excludes idle time.

    - `duration_seconds: Float`

      Elapsed time since thread creation in seconds. For archived threads, frozen at the final update.

    - `startup_seconds: Float`

      Time in seconds for the thread to begin running. Zero for child threads, which start immediately.

  - `status: BetaManagedAgentsSessionThreadStatus`

    SessionThreadStatus enum

    - `:running`

    - `:idle`

    - `:rescheduling`

    - `:terminated`

  - `type: :session_thread`

    - `:session_thread`

  - `updated_at: Time`

    A timestamp in RFC 3339 format

  - `usage: BetaManagedAgentsSessionThreadUsage`

    Cumulative token usage for a session thread across all turns.

    - `cache_creation: BetaManagedAgentsCacheCreationUsage`

      Prompt-cache creation token usage broken down by cache lifetime.

      - `ephemeral_1h_input_tokens: Integer`

        Tokens used to create 1-hour ephemeral cache entries.

      - `ephemeral_5m_input_tokens: Integer`

        Tokens used to create 5-minute ephemeral cache entries.

    - `cache_read_input_tokens: Integer`

      Total tokens read from prompt cache.

    - `input_tokens: Integer`

      Total input tokens consumed across all turns.

    - `output_tokens: Integer`

      Total output tokens generated across all turns.

### Example

```ruby
require "anthropic"

anthropic = Anthropic::Client.new(api_key: "my-anthropic-api-key")

beta_managed_agents_session_thread = anthropic.beta.sessions.threads.archive(
  "sthr_011CZkZVWa6oIjw0rgXZpnBt",
  session_id: "sesn_011CZkZAtmR3yMPDzynEDxu7"
)

puts(beta_managed_agents_session_thread)
```

#### Response

```json
{
  "id": "sthr_011CZkZVWa6oIjw0rgXZpnBt",
  "agent": {
    "id": "agent_011CZkYqphY8vELVzwCUpqiQ",
    "description": "A focused research subagent.",
    "mcp_servers": [
      {
        "name": "example-mcp",
        "type": "url",
        "url": "https://example-server.modelcontextprotocol.io/sse"
      }
    ],
    "model": {
      "id": "claude-sonnet-4-6",
      "speed": "standard"
    },
    "name": "Researcher",
    "skills": [
      {
        "skill_id": "xlsx",
        "type": "anthropic",
        "version": "1"
      }
    ],
    "system": "You are a research subagent that gathers and summarises sources for the coordinating agent.",
    "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",
    "version": 1
  },
  "archived_at": null,
  "created_at": "2026-03-15T10:00:00Z",
  "parent_thread_id": null,
  "session_id": "sesn_011CZkZAtmR3yMPDzynEDxu7",
  "stats": {
    "active_seconds": 0,
    "duration_seconds": 0,
    "startup_seconds": 0
  },
  "status": "idle",
  "type": "session_thread",
  "updated_at": "2026-03-15T10:00:00Z",
  "usage": {
    "cache_creation": {
      "ephemeral_1h_input_tokens": 0,
      "ephemeral_5m_input_tokens": 0
    },
    "cache_read_input_tokens": 0,
    "input_tokens": 0,
    "output_tokens": 0
  }
}
```