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# title: List Session Threads url: https://platform.claude.com/docs/en/api/beta/sessions/threads/list

# List Session Threads

GET /v1/sessions/{session_id}/threads

List Session Threads

# Path parameters

  • session_id: string

# Query parameters

  • limit: optional number

    Maximum results per page. Defaults to 1000.

    format: int32

  • page: optional string

    Opaque pagination cursor from a previous response's next_page. Forward-only.

# Headers

  • "anthropic-beta": optional array of AnthropicBeta

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

    • string

    • "message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 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"

      • "user-profiles-2026-08-18"

      • "user-profiles-2026-09-04"

      • "advisor-tool-2026-03-01"

      • "managed-agents-2026-04-01"

      • "cache-diagnosis-2026-04-07"

      • "dreaming-2026-04-21"

      • "thinking-token-count-2026-05-13"

      • "server-side-fallback-2026-06-01"

      • "server-side-fallback-2026-07-01"

      • "fallback-credit-2026-06-01"

      • "fallback-credit-2026-07-01"

      • "agent-memory-2026-07-22"

      • "mid-conversation-tool-changes-2026-07-01"

      • "compact-2026-01-12"

      • "computer-use-2025-11-24"

      • "mcp-tunnels-2026-06-22"

      • "structured-outputs-2025-11-13"

      • "task-budgets-2026-03-13"

      • "thinking-display-updates-2026-08-18"

      • "ce-user-management-2026-07-13"

      • "mid-conversation-output-config-2026-07-01"

      • "thinking-binding-controls-2026-08-01"

      • "mid-conversation-system-clear-at-2026-08-21"

      • "compact-2026-09-04"

  • "anthropic-workspace-id": optional string

# Returns

  • data: optional array of BetaManagedAgentsSessionThread

    Threads in the session, primary first then children in spawn order.

    • type: "session_thread"

    • id: string

      Unique identifier for this thread.

    • agent: BetaManagedAgentsSessionThreadAgent or BetaManagedAgentsAdvisor

      The resolved agent a session thread runs: a saved-agent snapshot, the platform advisor entry, or an inline-defined (ephemeral) agent snapshot.

      • BetaManagedAgentsSessionThreadAgent object

        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.

        • type: "agent"

        • id: string

        • description: string or null

        • mcp_servers: array of BetaManagedAgentsMCPServerURLDefinition

          • type: "url"

          • name: string

          • url: string

        • model: BetaManagedAgentsModelConfig

          Model identifier and configuration.

          • id: BetaManagedAgentsModel

            The model that will power your agent.

            See models for additional details and options.

            • "claude-fable-5-1" or "claude-sonnet-5" or "claude-fable-5" or 11 more

              The model that will power your agent.

              See models for additional details and options.

              • "claude-fable-5-1"

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

              • "claude-sonnet-5"

                High-performance 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"

                Fastest model with near-frontier intelligence

              • "claude-haiku-4-5-20251001"

                Fastest model with near-frontier intelligence

              • "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"

                High-performance model for agents and coding

              • "claude-sonnet-4-5-20250929"

                High-performance model for agents and coding

            • string

          • effort: optional BetaManagedAgentsEffortLow or BetaManagedAgentsEffortMedium or BetaManagedAgentsEffortHigh or 2 more

            How hard Claude works on each turn. Sets output_config.effort on every Messages call the session makes.

            • BetaManagedAgentsEffortLow object

              Low effort. Favors latency over reasoning depth.

              • type: "low"

            • BetaManagedAgentsEffortMedium object

              Medium effort. Balances latency and reasoning depth.

              • type: "medium"

            • BetaManagedAgentsEffortHigh object

              High effort. Favors reasoning depth.

              • type: "high"

            • BetaManagedAgentsEffortXhigh object

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

              • type: "xhigh"

            • BetaManagedAgentsEffortMax object

              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. Not all models support fast; invalid combinations are rejected at create time.

            • "standard"

            • "fast"

        • name: string

        • skills: array of BetaManagedAgentsAnthropicSkill or BetaManagedAgentsCustomSkill

          • BetaManagedAgentsAnthropicSkill object

            A resolved Anthropic-managed skill.

            • type: "anthropic"

            • skill_id: string

            • version: string

          • BetaManagedAgentsCustomSkill object

            A resolved user-created custom skill.

            • type: "custom"

            • skill_id: string

            • version: string

        • system: string or null

        • tools: array of BetaManagedAgentsAgentToolset20260401 or BetaManagedAgentsMCPToolset or BetaManagedAgentsCustomTool

          • BetaManagedAgentsAgentToolset20260401 object

            • type: "agent_toolset_20260401"

            • configs: array of BetaManagedAgentsAgentToolConfig

              • BetaManagedAgentsBashToolConfig object

                Configuration for the bash tool.

                • type: "bash"

                • enabled: boolean

                • name: "bash"

                • permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy or BetaManagedAgentsAutoPolicy

                  Permission policy for tool execution.

                  • BetaManagedAgentsAlwaysAllowPolicy object

                    Tool calls are automatically approved without user confirmation.

                    • type: "always_allow"

                  • BetaManagedAgentsAlwaysAskPolicy object

                    Tool calls require user confirmation before execution.

                    • type: "always_ask"

                  • BetaManagedAgentsAutoPolicy object

                    The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask.

                    • type: "auto"

              • BetaManagedAgentsEditToolConfig object

                Configuration for the edit tool.

                • type: "edit"

                • enabled: boolean

                • name: "edit"

                • permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy or BetaManagedAgentsAutoPolicy

                  Permission policy for tool execution.

                  • BetaManagedAgentsAlwaysAllowPolicy object

                    Tool calls are automatically approved without user confirmation.

                  • BetaManagedAgentsAlwaysAskPolicy object

                    Tool calls require user confirmation before execution.

                  • BetaManagedAgentsAutoPolicy object

                    The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask.

              • BetaManagedAgentsReadToolConfig object

                Configuration for the read tool.

                • type: "read"

                • enabled: boolean

                • name: "read"

                • permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy or BetaManagedAgentsAutoPolicy

                  Permission policy for tool execution.

                  • BetaManagedAgentsAlwaysAllowPolicy object

                    Tool calls are automatically approved without user confirmation.

                  • BetaManagedAgentsAlwaysAskPolicy object

                    Tool calls require user confirmation before execution.

                  • BetaManagedAgentsAutoPolicy object

                    The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask.

              • BetaManagedAgentsWriteToolConfig object

                Configuration for the write tool.

                • type: "write"

                • enabled: boolean

                • name: "write"

                • permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy or BetaManagedAgentsAutoPolicy

                  Permission policy for tool execution.

                  • BetaManagedAgentsAlwaysAllowPolicy object

                    Tool calls are automatically approved without user confirmation.

                  • BetaManagedAgentsAlwaysAskPolicy object

                    Tool calls require user confirmation before execution.

                  • BetaManagedAgentsAutoPolicy object

                    The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask.

              • BetaManagedAgentsGlobToolConfig object

                Configuration for the glob tool.

                • type: "glob"

                • enabled: boolean

                • name: "glob"

                • permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy or BetaManagedAgentsAutoPolicy

                  Permission policy for tool execution.

                  • BetaManagedAgentsAlwaysAllowPolicy object

                    Tool calls are automatically approved without user confirmation.

                  • BetaManagedAgentsAlwaysAskPolicy object

                    Tool calls require user confirmation before execution.

                  • BetaManagedAgentsAutoPolicy object

                    The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask.

              • BetaManagedAgentsGrepToolConfig object

                Configuration for the grep tool.

                • type: "grep"

                • enabled: boolean

                • name: "grep"

                • permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy or BetaManagedAgentsAutoPolicy

                  Permission policy for tool execution.

                  • BetaManagedAgentsAlwaysAllowPolicy object

                    Tool calls are automatically approved without user confirmation.

                  • BetaManagedAgentsAlwaysAskPolicy object

                    Tool calls require user confirmation before execution.

                  • BetaManagedAgentsAutoPolicy object

                    The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask.

              • BetaManagedAgentsWebFetchToolConfig object

                Configuration for the web_fetch tool.

                • type: "web_fetch"

                • enabled: boolean

                • name: "web_fetch"

                • permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy or BetaManagedAgentsAutoPolicy

                  Permission policy for tool execution.

                  • BetaManagedAgentsAlwaysAllowPolicy object

                    Tool calls are automatically approved without user confirmation.

                  • BetaManagedAgentsAlwaysAskPolicy object

                    Tool calls require user confirmation before execution.

                  • BetaManagedAgentsAutoPolicy object

                    The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask.

                • allowed_domains: optional array of string

                • blocked_domains: optional array of string

                • max_content_tokens: optional number or null

                  format: int32

              • BetaManagedAgentsWebSearchToolConfig object

                Configuration for the web_search tool.

                • type: "web_search"

                • enabled: boolean

                • name: "web_search"

                • permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy or BetaManagedAgentsAutoPolicy

                  Permission policy for tool execution.

                  • BetaManagedAgentsAlwaysAllowPolicy object

                    Tool calls are automatically approved without user confirmation.

                  • BetaManagedAgentsAlwaysAskPolicy object

                    Tool calls require user confirmation before execution.

                  • BetaManagedAgentsAutoPolicy object

                    The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask.

                • allowed_domains: optional array of string

                • blocked_domains: optional array of string

                • user_location: optional BetaManagedAgentsUserLocation or null

                  Approximate user location for search result localization.

                  • type: "approximate"

                    Location precision. Only "approximate" is supported.

                  • city: optional string or null

                    City name.

                    minLength: 1, maxLength: 255

                  • country: optional string or null

                    Two-letter ISO 3166-1 country code, uppercase.

                  • region: optional string or null

                    Region or state name.

                    minLength: 1, maxLength: 255

                  • timezone: optional string or null

                    IANA timezone identifier, e.g. "America/Los_Angeles".

                    minLength: 1, maxLength: 255

            • default_config: BetaManagedAgentsAgentToolsetDefaultConfig

              Resolved default configuration for agent tools.

              • enabled: boolean

              • permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy or BetaManagedAgentsAutoPolicy

                Permission policy for tool execution.

                • BetaManagedAgentsAlwaysAllowPolicy object

                  Tool calls are automatically approved without user confirmation.

                • BetaManagedAgentsAlwaysAskPolicy object

                  Tool calls require user confirmation before execution.

                • BetaManagedAgentsAutoPolicy object

                  The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask.

          • BetaManagedAgentsMCPToolset object

            • type: "mcp_toolset"

            • configs: array of BetaManagedAgentsMCPToolConfig

              • enabled: boolean

              • name: string

              • permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy or BetaManagedAgentsAutoPolicy

                Permission policy for tool execution.

                • BetaManagedAgentsAlwaysAllowPolicy object

                  Tool calls are automatically approved without user confirmation.

                • BetaManagedAgentsAlwaysAskPolicy object

                  Tool calls require user confirmation before execution.

                • BetaManagedAgentsAutoPolicy object

                  The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask.

            • default_config: BetaManagedAgentsMCPToolsetDefaultConfig

              Resolved default configuration for all tools from an MCP server.

              • enabled: boolean

              • permission_policy: BetaManagedAgentsAlwaysAllowPolicy or BetaManagedAgentsAlwaysAskPolicy or BetaManagedAgentsAutoPolicy

                Permission policy for tool execution.

                • BetaManagedAgentsAlwaysAllowPolicy object

                  Tool calls are automatically approved without user confirmation.

                • BetaManagedAgentsAlwaysAskPolicy object

                  Tool calls require user confirmation before execution.

                • BetaManagedAgentsAutoPolicy object

                  The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask.

            • mcp_server_name: string

          • BetaManagedAgentsCustomTool object

            A custom tool as returned in API responses.

            • type: "custom"

            • description: string

            • input_schema: BetaManagedAgentsCustomToolInputSchema

              JSON Schema for custom tool input parameters.

              • type: "object"

              • properties: optional map[unknown] or null

              • required: optional array of string or null

            • name: string

        • version: number

          format: int32

      • BetaManagedAgentsAdvisor object

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

        • type: "advisor"

        • model: string

          The advisor model id.

    • archived_at: string or null

      A timestamp in RFC 3339 format

      format: date-time

    • created_at: string

      A timestamp in RFC 3339 format

      format: date-time

    • parent_thread_id: string or null

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

    • session_id: string

      The session this thread belongs to.

    • stats: BetaManagedAgentsSessionThreadStats or null

      Timing statistics for a session thread.

      • active_seconds: optional number

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

        format: double

      • duration_seconds: optional number

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

        format: double

      • startup_seconds: optional number

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

        format: double

    • status: BetaManagedAgentsSessionThreadStatus

      SessionThreadStatus enum

      • "running"

      • "idle"

      • "rescheduling"

      • "terminated"

    • updated_at: string

      A timestamp in RFC 3339 format

      format: date-time

    • usage: BetaManagedAgentsSessionThreadUsage or null

      Cumulative token usage for a session thread across all turns.

      • active_seconds: optional number

        Cumulative time in seconds this thread spent in running status. Equal to stats.active_seconds; surfaced here so a thread's usage carries every quantity its cost is priced on.

        format: double

      • cache_creation: optional BetaManagedAgentsCacheCreationUsage

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

        • ephemeral_1h_input_tokens: optional number

          Tokens used to create 1-hour ephemeral cache entries.

          format: int32

        • ephemeral_5m_input_tokens: optional number

          Tokens used to create 5-minute ephemeral cache entries.

          format: int32

      • cache_read_input_tokens: optional number

        Total tokens read from prompt cache.

        format: int32

      • input_tokens: optional number

        Total input tokens consumed across all turns.

        format: int32

      • list_cost: optional BetaMonetaryAmount or null

        A monetary amount in a specific currency.

        • amount: string

          Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied.

        • currency: BetaCurrency

          Uppercase ISO-4217 currency code. USD is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced.

      • output_tokens: optional number

        Total output tokens generated across all turns.

        format: int32

      • server_tool_use: optional BetaManagedAgentsServerToolUsage or null

        Cumulative count of server-executed tool invocations, broken down by tool.

        • web_fetch_requests: optional number

          Number of server-executed web fetch requests.

          format: int32

        • web_search_requests: optional number

          Number of server-executed web search requests.

          format: int32

  • next_page: optional string or null

    Opaque cursor for the next page. Null when no more results.

# Example

bash
curl https://api.anthropic.com/v1/sessions/$SESSION_ID/threads \
    -H 'anthropic-version: 2023-06-01' \
    -H 'anthropic-beta: managed-agents-2026-04-01' \
    -H "X-Api-Key: $ANTHROPIC_API_KEY"

# Response (200)

json
{
  "data": [
    {
      "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-opus-5",
          "effort": {
            "type": "low"
          },
          "inference_geo": "inference_geo",
          "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"
                },
                "type": "bash"
              }
            ],
            "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": {
        "active_seconds": 0,
        "cache_creation": {
          "ephemeral_1h_input_tokens": 0,
          "ephemeral_5m_input_tokens": 0
        },
        "cache_read_input_tokens": 0,
        "input_tokens": 0,
        "list_cost": {
          "amount": "2500",
          "currency": "USD"
        },
        "output_tokens": 0,
        "server_tool_use": {
          "web_fetch_requests": 0,
          "web_search_requests": 3
        }
      }
    }
  ],
  "next_page": "page_MjAyNS0wNS0xNFQwMDowMDowMFo="
}
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