List Events

client.Beta.Sessions.Events.List(ctx, sessionID, params) (*PageCursor[BetaManagedAgentsSessionEventUnion], error)

GET/v1/sessions/{session_id}/events

List Events

Parameters

sessionID string⁠Path

params BetaSessionEventListParams

CreatedAtGt param.Opt[Time] OptionalQuery

Return events created after this time (exclusive). Compared against the event's processed_at value.

formatdate-time

CreatedAtGte param.Opt[Time] OptionalQuery

Return events created at or after this time (inclusive). Compared against the event's processed_at value.

formatdate-time

CreatedAtLt param.Opt[Time] OptionalQuery

Return events created before this time (exclusive). Compared against the event's processed_at value.

formatdate-time

CreatedAtLte param.Opt[Time] OptionalQuery

Return events created at or before this time (inclusive). Compared against the event's processed_at value.

formatdate-time

Limit param.Opt[int64] OptionalQuery

formatint32

Order BetaSessionEventListParamsOrder OptionalQuery

Sort direction for results, ordered by the event's processed_at. Defaults to asc (chronological).

const BetaSessionEventListParamsOrderAsc BetaSessionEventListParamsOrder = "asc"

const BetaSessionEventListParamsOrderDesc BetaSessionEventListParamsOrder = "desc"

Page param.Opt[string] OptionalQuery

Opaque pagination cursor from a previous response's next_page.

Types []BetaManagedAgentsSessionEventType OptionalQuery

Filter by event type. Values match the type field on returned events (for example, user.message or agent.tool_use). Omit to return all event types.

const BetaManagedAgentsSessionEventTypeUserMessage BetaManagedAgentsSessionEventType = "user.message"

const BetaManagedAgentsSessionEventTypeUserInterrupt BetaManagedAgentsSessionEventType = "user.interrupt"

const BetaManagedAgentsSessionEventTypeUserToolConfirmation BetaManagedAgentsSessionEventType = "user.tool_confirmation"

const BetaManagedAgentsSessionEventTypeUserCustomToolResult BetaManagedAgentsSessionEventType = "user.custom_tool_result"

const BetaManagedAgentsSessionEventTypeAgentCustomToolUse BetaManagedAgentsSessionEventType = "agent.custom_tool_use"

const BetaManagedAgentsSessionEventTypeAgentMessage BetaManagedAgentsSessionEventType = "agent.message"

const BetaManagedAgentsSessionEventTypeAgentThinking BetaManagedAgentsSessionEventType = "agent.thinking"

const BetaManagedAgentsSessionEventTypeAgentMCPToolUse BetaManagedAgentsSessionEventType = "agent.mcp_tool_use"

const BetaManagedAgentsSessionEventTypeAgentMCPToolResult BetaManagedAgentsSessionEventType = "agent.mcp_tool_result"

const BetaManagedAgentsSessionEventTypeAgentToolUse BetaManagedAgentsSessionEventType = "agent.tool_use"

const BetaManagedAgentsSessionEventTypeAgentToolResult BetaManagedAgentsSessionEventType = "agent.tool_result"

const BetaManagedAgentsSessionEventTypeAgentThreadMessageReceived BetaManagedAgentsSessionEventType = "agent.thread_message_received"

const BetaManagedAgentsSessionEventTypeAgentThreadMessageSent BetaManagedAgentsSessionEventType = "agent.thread_message_sent"

const BetaManagedAgentsSessionEventTypeAgentThreadContextCompacted BetaManagedAgentsSessionEventType = "agent.thread_context_compacted"

const BetaManagedAgentsSessionEventTypeSessionError BetaManagedAgentsSessionEventType = "session.error"

const BetaManagedAgentsSessionEventTypeSessionStatusRescheduled BetaManagedAgentsSessionEventType = "session.status_rescheduled"

const BetaManagedAgentsSessionEventTypeSessionStatusRunning BetaManagedAgentsSessionEventType = "session.status_running"

const BetaManagedAgentsSessionEventTypeSessionStatusIdle BetaManagedAgentsSessionEventType = "session.status_idle"

const BetaManagedAgentsSessionEventTypeSessionStatusTerminated BetaManagedAgentsSessionEventType = "session.status_terminated"

const BetaManagedAgentsSessionEventTypeSessionThreadCreated BetaManagedAgentsSessionEventType = "session.thread_created"

const BetaManagedAgentsSessionEventTypeSpanOutcomeEvaluationStart BetaManagedAgentsSessionEventType = "span.outcome_evaluation_start"

const BetaManagedAgentsSessionEventTypeSpanOutcomeEvaluationEnd BetaManagedAgentsSessionEventType = "span.outcome_evaluation_end"

const BetaManagedAgentsSessionEventTypeSpanModelRequestStart BetaManagedAgentsSessionEventType = "span.model_request_start"

const BetaManagedAgentsSessionEventTypeSpanModelRequestEnd BetaManagedAgentsSessionEventType = "span.model_request_end"

const BetaManagedAgentsSessionEventTypeSpanOutcomeEvaluationOngoing BetaManagedAgentsSessionEventType = "span.outcome_evaluation_ongoing"

const BetaManagedAgentsSessionEventTypeUserDefineOutcome BetaManagedAgentsSessionEventType = "user.define_outcome"

const BetaManagedAgentsSessionEventTypeSessionThreadStatusRunning BetaManagedAgentsSessionEventType = "session.thread_status_running"

const BetaManagedAgentsSessionEventTypeSessionThreadStatusIdle BetaManagedAgentsSessionEventType = "session.thread_status_idle"

const BetaManagedAgentsSessionEventTypeSessionThreadStatusTerminated BetaManagedAgentsSessionEventType = "session.thread_status_terminated"

const BetaManagedAgentsSessionEventTypeUserToolResult BetaManagedAgentsSessionEventType = "user.tool_result"

const BetaManagedAgentsSessionEventTypeSessionThreadStatusRescheduled BetaManagedAgentsSessionEventType = "session.thread_status_rescheduled"

const BetaManagedAgentsSessionEventTypeSessionUpdated BetaManagedAgentsSessionEventType = "session.updated"

const BetaManagedAgentsSessionEventTypeSystemMessage BetaManagedAgentsSessionEventType = "system.message"

const BetaManagedAgentsSessionEventTypeSessionUsage BetaManagedAgentsSessionEventType = "session.usage"

const BetaManagedAgentsSessionEventTypeWorkflowRunCreated BetaManagedAgentsSessionEventType = "workflow_run.created"

const BetaManagedAgentsSessionEventTypeWorkflowRunStatusRunning BetaManagedAgentsSessionEventType = "workflow_run.status_running"

const BetaManagedAgentsSessionEventTypeWorkflowRunStatusIdle BetaManagedAgentsSessionEventType = "workflow_run.status_idle"

const BetaManagedAgentsSessionEventTypeWorkflowRunStatusEnded BetaManagedAgentsSessionEventType = "workflow_run.status_ended"

const BetaManagedAgentsSessionEventTypeWorkflowRunError BetaManagedAgentsSessionEventType = "workflow_run.error"

const BetaManagedAgentsSessionEventTypeWorkflowRunPhaseStarted BetaManagedAgentsSessionEventType = "workflow_run.phase_started"

const BetaManagedAgentsSessionEventTypeWorkflowRunPhaseEnded BetaManagedAgentsSessionEventType = "workflow_run.phase_ended"

Betas []AnthropicBeta OptionalHeader

This endpoint is in beta: requests must send managed-agents-2026-04-01 in this header.

const AnthropicBetaMessageBatches2024_09_24 AnthropicBeta = "message-batches-2024-09-24"

const AnthropicBetaPromptCaching2024_07_31 AnthropicBeta = "prompt-caching-2024-07-31"

const AnthropicBetaComputerUse2024_10_22 AnthropicBeta = "computer-use-2024-10-22"

const AnthropicBetaComputerUse2025_01_24 AnthropicBeta = "computer-use-2025-01-24"

const AnthropicBetaPDFs2024_09_25 AnthropicBeta = "pdfs-2024-09-25"

const AnthropicBetaTokenCounting2024_11_01 AnthropicBeta = "token-counting-2024-11-01"

const AnthropicBetaTokenEfficientTools2025_02_19 AnthropicBeta = "token-efficient-tools-2025-02-19"

const AnthropicBetaOutput128k2025_02_19 AnthropicBeta = "output-128k-2025-02-19"

const AnthropicBetaFilesAPI2025_04_14 AnthropicBeta = "files-api-2025-04-14"

const AnthropicBetaMCPClient2025_04_04 AnthropicBeta = "mcp-client-2025-04-04"

const AnthropicBetaMCPClient2025_11_20 AnthropicBeta = "mcp-client-2025-11-20"

const AnthropicBetaDevFullThinking2025_05_14 AnthropicBeta = "dev-full-thinking-2025-05-14"

const AnthropicBetaInterleavedThinking2025_05_14 AnthropicBeta = "interleaved-thinking-2025-05-14"

const AnthropicBetaCodeExecution2025_05_22 AnthropicBeta = "code-execution-2025-05-22"

const AnthropicBetaExtendedCacheTTL2025_04_11 AnthropicBeta = "extended-cache-ttl-2025-04-11"

const AnthropicBetaContext1m2025_08_07 AnthropicBeta = "context-1m-2025-08-07"

const AnthropicBetaContextManagement2025_06_27 AnthropicBeta = "context-management-2025-06-27"

const AnthropicBetaModelContextWindowExceeded2025_08_26 AnthropicBeta = "model-context-window-exceeded-2025-08-26"

const AnthropicBetaSkills2025_10_02 AnthropicBeta = "skills-2025-10-02"

const AnthropicBetaFastMode2026_02_01 AnthropicBeta = "fast-mode-2026-02-01"

const AnthropicBetaOutput300k2026_03_24 AnthropicBeta = "output-300k-2026-03-24"

const AnthropicBetaUserProfiles2026_03_24 AnthropicBeta = "user-profiles-2026-03-24"

const AnthropicBetaUserProfiles2026_08_18 AnthropicBeta = "user-profiles-2026-08-18"

const AnthropicBetaUserProfiles2026_09_04 AnthropicBeta = "user-profiles-2026-09-04"

const AnthropicBetaAdvisorTool2026_03_01 AnthropicBeta = "advisor-tool-2026-03-01"

const AnthropicBetaManagedAgents2026_04_01 AnthropicBeta = "managed-agents-2026-04-01"

const AnthropicBetaCacheDiagnosis2026_04_07 AnthropicBeta = "cache-diagnosis-2026-04-07"

const AnthropicBetaDreaming2026_04_21 AnthropicBeta = "dreaming-2026-04-21"

const AnthropicBetaThinkingTokenCount2026_05_13 AnthropicBeta = "thinking-token-count-2026-05-13"

const AnthropicBetaServerSideFallback2026_06_01 AnthropicBeta = "server-side-fallback-2026-06-01"

const AnthropicBetaServerSideFallback2026_07_01 AnthropicBeta = "server-side-fallback-2026-07-01"

const AnthropicBetaFallbackCredit2026_06_01 AnthropicBeta = "fallback-credit-2026-06-01"

const AnthropicBetaFallbackCredit2026_07_01 AnthropicBeta = "fallback-credit-2026-07-01"

const AnthropicBetaAgentMemory2026_07_22 AnthropicBeta = "agent-memory-2026-07-22"

const AnthropicBetaMidConversationToolChanges2026_07_01 AnthropicBeta = "mid-conversation-tool-changes-2026-07-01"

const AnthropicBetaCompact2026_01_12 AnthropicBeta = "compact-2026-01-12"

const AnthropicBetaComputerUse2025_11_24 AnthropicBeta = "computer-use-2025-11-24"

const AnthropicBetaMCPTunnels2026_06_22 AnthropicBeta = "mcp-tunnels-2026-06-22"

const AnthropicBetaStructuredOutputs2025_11_13 AnthropicBeta = "structured-outputs-2025-11-13"

const AnthropicBetaTaskBudgets2026_03_13 AnthropicBeta = "task-budgets-2026-03-13"

const AnthropicBetaThinkingDisplayUpdates2026_08_18 AnthropicBeta = "thinking-display-updates-2026-08-18"

const AnthropicBetaCEUserManagement2026_07_13 AnthropicBeta = "ce-user-management-2026-07-13"

const AnthropicBetaMidConversationOutputConfig2026_07_01 AnthropicBeta = "mid-conversation-output-config-2026-07-01"

const AnthropicBetaThinkingBindingControls2026_08_01 AnthropicBeta = "thinking-binding-controls-2026-08-01"

const AnthropicBetaMidConversationSystemClearAt2026_08_21 AnthropicBeta = "mid-conversation-system-clear-at-2026-08-21"

const AnthropicBetaCompact2026_09_04 AnthropicBeta = "compact-2026-09-04"

const AnthropicBetaInlineTools2026_09_15 AnthropicBeta = "inline-tools-2026-09-15"

const AnthropicBetaMCPClient2026_09_15 AnthropicBeta = "mcp-client-2026-09-15"

const AnthropicBetaCEPlugins2026_09_01 AnthropicBeta = "ce-plugins-2026-09-01"

const AnthropicBetaSpendLimitReads2026_09_26 AnthropicBeta = "spend-limit-reads-2026-09-26"

const AnthropicBetaTelemetryDestinations2026_08_11 AnthropicBeta = "telemetry-destinations-2026-08-11"

WorkspaceID param.Opt[string] OptionalHeader

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

type BetaManagedAgentsSessionEventUnion interface{…}

Union type for all event types in a session.

One of the following:

List Events

package main

import (
	"context"
	"fmt"

	"github.com/anthropics/anthropic-sdk-go"
	"github.com/anthropics/anthropic-sdk-go/option"
)

func main() {
	client := anthropic.NewClient(
		option.WithAPIKey("my-anthropic-api-key"),
	)
	page, err := client.Beta.Sessions.Events.List(
		context.TODO(),
		"sesn_011CZkZAtmR3yMPDzynEDxu7",
		anthropic.BetaSessionEventListParams{},
	)
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", page)
}

Response 200

{
  "data": [
    {
      "id": "sevt_011CZkZGPp1iBcp4kaQSihUm",
      "content": [
        {
          "text": "Where is my order #1234?",
          "type": "text"
        }
      ],
      "type": "user.message",
      "processed_at": "2026-03-15T10:00:00Z"
    },
    {
      "id": "sevt_011CZkZHPq1jCdq5mbRTjiVn",
      "content": [
        {
          "text": "Let me look up order #1234 for you.",
          "type": "text"
        }
      ],
      "processed_at": "2026-03-15T10:00:00Z",
      "type": "agent.message"
    }
  ],
  "next_page": "page_MjAyNS0wNS0xNFQwMDowMDowMFo="
}

Returns Examples

Response 200

{
  "data": [
    {
      "id": "sevt_011CZkZGPp1iBcp4kaQSihUm",
      "content": [
        {
          "text": "Where is my order #1234?",
          "type": "text"
        }
      ],
      "type": "user.message",
      "processed_at": "2026-03-15T10:00:00Z"
    },
    {
      "id": "sevt_011CZkZHPq1jCdq5mbRTjiVn",
      "content": [
        {
          "text": "Let me look up order #1234 for you.",
          "type": "text"
        }
      ],
      "processed_at": "2026-03-15T10:00:00Z",
      "type": "agent.message"
    }
  ],
  "next_page": "page_MjAyNS0wNS0xNFQwMDowMDowMFo="
}