--- title: "Archive Session Thread" method: POST path: "/v1/sessions/{session_id}/threads/{thread_id}/archive?beta=true" --- # Archive Session Thread `POST /v1/sessions/{session_id}/threads/{thread_id}/archive?beta=true` ## Request - Base URL: `https://api.anthropic.com` - URL: `https://api.anthropic.com/v1/sessions/{session_id}/threads/{thread_id}/archive?beta=true` - Auth: none declared - TypeScript: (a function with typed inputs; its response is checked against the schema) ## Path parameters - `session_id` string, required - `thread_id` string, required ## Headers - `anthropic-version` string: The version of the Claude API you want to use. Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning). - `anthropic-beta` AnthropicBeta[]: This endpoint is in beta: requests must send `managed-agents-2026-04-01` in this header. - union: Beta names you can send in the `anthropic-beta` header. See [Beta headers](https://platform.claude.com/docs/en/api/beta-headers) for how to send them and where to find the name a feature needs. - string - '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' | 'inline-tools-2026-09-15' | 'mcp-client-2026-09-15' | 'ce-plugins-2026-09-01' | 'spend-limit-reads-2026-09-26' | 'telemetry-destinations-2026-08-11' | 'webhooks-2026-10-07' | 'admin-user-sign-out-2026-10-08' | 'message-threads-2026-08-12' | 'analytics-usage-cost-2026-08-24' | 'experimental-claude-tag-2026-10-21' - `anthropic-workspace-id` string ## Response `200` Successful response (OK) - BetaManagedAgentsSessionThread: An execution thread within a `session`. Each session has one primary thread plus zero or more child threads. - `type` 'session_thread', required - `id` string, required: Unique identifier for this thread. - `session_id` string, required: The session this thread belongs to. - `workflow_run_id` string, nullable, required: Identifier of the workflow run that created the thread, or `null` for any other thread. - `status` 'running' | 'idle' | 'rescheduling' | 'terminated', required - `agent` union, required: The resolved agent a `session_thread` runs. - 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`. - `type` 'agent', required - `id` string, required - `version` integer, required - `name` string, required - `description` string, nullable, required - `model` BetaManagedAgentsModelConfig, required: Model identifier and configuration. - `id` union, required: The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - 'claude-fable-5-2': Frontier intelligence for ambitious work in coding, enterprise workflows, and the sciences - 'claude-haiku-5-5': Fastest model for high-volume, real-time tasks - 'claude-sonnet-5-5': Efficient model for coding and agents - 'claude-opus-5-5': Powerful intelligence for coding, knowledge work, and long-running agents - 'claude-fable-5-1': Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - 'claude-sonnet-5': Efficient 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' - 'claude-haiku-4-5-20251001' - '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 - `speed` 'standard' | 'fast' - `effort` union: How hard Claude works on each turn. Sets `output_config.effort` on every Messages call the session makes. - object: Low effort. Favors latency over reasoning depth. - `type` 'low', required - object: Medium effort. Balances latency and reasoning depth. - `type` 'medium', required - object: High effort. Favors reasoning depth. - `type` 'high', required - object: Extra-high effort. Not all models accept this level. - `type` 'xhigh', required - object: Maximum effort. Favors reasoning depth over latency. - `type` 'max', required - `inference_geo` string: Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `system` string, nullable, required - `tools` BetaManagedAgentsAgentTool[], required - union: Union type for tool configurations returned in API responses. - object - `type` 'agent_toolset_20260401', required - `default_config` BetaManagedAgentsAgentToolsetDefaultConfig, required: Resolved default configuration for agent tools. - … - `configs` BetaManagedAgentsAgentToolConfigUnion[], required - … - object - `type` 'mcp_toolset', required - `mcp_server_name` string, required - `default_config` BetaManagedAgentsMCPToolsetDefaultConfig, required: Resolved default configuration for all tools from an MCP server. - … - `configs` BetaManagedAgentsMCPToolConfig[], required - … - object: A custom tool as returned in API responses. - `type` 'custom', required - `name` string, required - `description` string, required - `input_schema` BetaManagedAgentsCustomToolInputSchema, required: JSON Schema for custom tool input parameters. - … - `mcp_servers` BetaManagedAgentsMCPServer[], required - `type` 'url', required - `name` string, required - `url` string, required - `skills` BetaManagedAgentsSkill[], required - union: Resolved skill as returned in API responses. - BetaManagedAgentsAnthropicSkill: A resolved Anthropic-managed skill. - `type` 'anthropic', required - `skill_id` string, required - `version` string, required - BetaManagedAgentsCustomSkill: A resolved user-created custom skill. - `type` 'custom', required - `skill_id` string, required - `version` string, required - `execution_identity` union, required: Execution principal for runs of this agent as returned in API responses. - BetaManagedAgentsAwsRoleExecutionIdentity: An AWS IAM role principal as returned in API responses. - `type` 'aws_role', required - `role_arn` string, required: The IAM role's ARN. - BetaManagedAgentsServiceAccountExecutionIdentity: The Anthropic-managed service account as returned in API responses. - `type` 'service_account', required - BetaManagedAgentsAdvisor: Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type` 'advisor', required - `model` string, required: The advisor model id. - BetaManagedAgentsInlineAgent: An agent that has no Agent resource, and so no `id` or `version`. It is defined inline, in a workflow run's plan or when a session thread is spawned, and is not saved. - `type` 'inline', required - `name` string, required: The name that the agent's definition gave, or one that the server assigned. - `description` string, nullable, required - `model` BetaManagedAgentsModelConfig, required: Model identifier and configuration. - `id` union, required: The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - 'claude-fable-5-2': Frontier intelligence for ambitious work in coding, enterprise workflows, and the sciences - 'claude-haiku-5-5': Fastest model for high-volume, real-time tasks - 'claude-sonnet-5-5': Efficient model for coding and agents - 'claude-opus-5-5': Powerful intelligence for coding, knowledge work, and long-running agents - 'claude-fable-5-1': Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - 'claude-sonnet-5': Efficient 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' - 'claude-haiku-4-5-20251001' - '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 - `speed` 'standard' | 'fast' - `effort` union: How hard Claude works on each turn. Sets `output_config.effort` on every Messages call the session makes. - object: Low effort. Favors latency over reasoning depth. - `type` 'low', required - object: Medium effort. Balances latency and reasoning depth. - `type` 'medium', required - object: High effort. Favors reasoning depth. - `type` 'high', required - object: Extra-high effort. Not all models accept this level. - `type` 'xhigh', required - object: Maximum effort. Favors reasoning depth over latency. - `type` 'max', required - `inference_geo` string: Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `system` string, nullable, required - `tools` BetaManagedAgentsAgentTool[], required - union: Union type for tool configurations returned in API responses. - object - `type` 'agent_toolset_20260401', required - `default_config` BetaManagedAgentsAgentToolsetDefaultConfig, required: Resolved default configuration for agent tools. - … - `configs` BetaManagedAgentsAgentToolConfigUnion[], required - … - object - `type` 'mcp_toolset', required - `mcp_server_name` string, required - `default_config` BetaManagedAgentsMCPToolsetDefaultConfig, required: Resolved default configuration for all tools from an MCP server. - … - `configs` BetaManagedAgentsMCPToolConfig[], required - … - object: A custom tool as returned in API responses. - `type` 'custom', required - `name` string, required - `description` string, required - `input_schema` BetaManagedAgentsCustomToolInputSchema, required: JSON Schema for custom tool input parameters. - … - `mcp_servers` BetaManagedAgentsMCPServer[], required - `type` 'url', required - `name` string, required - `url` string, required - `skills` BetaManagedAgentsSkill[], required - union: Resolved skill as returned in API responses. - BetaManagedAgentsAnthropicSkill: A resolved Anthropic-managed skill. - `type` 'anthropic', required - `skill_id` string, required - `version` string, required - BetaManagedAgentsCustomSkill: A resolved user-created custom skill. - `type` 'custom', required - `skill_id` string, required - `version` string, required - `execution_identity` union, required: Execution principal for runs of this agent as returned in API responses. - BetaManagedAgentsAwsRoleExecutionIdentity: An AWS IAM role principal as returned in API responses. - `type` 'aws_role', required - `role_arn` string, required: The IAM role's ARN. - BetaManagedAgentsServiceAccountExecutionIdentity: The Anthropic-managed service account as returned in API responses. - `type` 'service_account', required - `parent_thread_id` string, nullable, required: Parent thread that spawned this thread. Null for the primary thread. - `created_at` string, date-time, required: A timestamp in RFC 3339 format - `updated_at` string, date-time, required: A timestamp in RFC 3339 format - `archived_at` string, date-time, required: A timestamp in RFC 3339 format - `usage` BetaManagedAgentsSessionThreadUsage, required: Cumulative token usage for a session thread across all turns. - `input_tokens` integer: Total input tokens consumed across all turns. - `output_tokens` integer: Total output tokens generated across all turns. - `cache_read_input_tokens` integer: Total tokens read from prompt cache. - `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. - `list_cost` object, nullable: A monetary amount in a specific currency. - `currency` 'USD', required - `amount` string, required: 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. - `active_seconds` number, double: 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. - `server_tool_use` object, nullable: Cumulative count of server-executed tool invocations, broken down by tool. - `web_search_requests` integer: Number of server-executed web search requests. - `web_fetch_requests` integer: Number of server-executed web fetch requests. - `stats` BetaManagedAgentsSessionThreadStats, required: Timing statistics for a session thread. - `duration_seconds` number, double: Elapsed time since thread creation in seconds. For archived threads, frozen at the final update. - `startup_seconds` number, double: Time in seconds for the thread to begin running. Zero for child threads, which start immediately. - `active_seconds` number, double: Cumulative time in seconds the thread spent actively running. Excludes idle time. ## Other responses - `400`: Invalid argument - The client specified an invalid argument - `401`: Unauthenticated - The request does not have valid authentication credentials - `403`: Permission denied - The caller does not have permission to execute the specified operation - `404`: Not found - Some requested entity was not found - `408`: Deadline exceeded - The deadline expired before the operation could complete - `409`: Aborted - The operation was aborted due to concurrency issue - `412`: Failed precondition - Operation was rejected because the system is not in required state - `413`: Out of range - Operation was attempted past the valid range - `429`: Resource exhausted - Some resource has been exhausted (rate limiting) - `431`: Request header fields too large - Request metadata was too large - `499`: Cancelled - The operation was cancelled by the client - `500`: Internal - Internal server error - `501`: Unimplemented - The operation is not implemented or supported - `503`: Unavailable - The service is currently unavailable - `504`: Deadline exceeded - Upstream service did not respond in time ## Changes - **2026-11-09** `d53195e9d075`: 2 info - added `subschema #1` to the `agent/allOf[#/components/schemas/BetaManagedAgentsSessionThreadAgentEntry]/oneOf[#/components/schemas/BetaManagedAgentsInlineAgent]/model/id` response property `anyOf` list for the response status `200` - added `subschema #1` to the `agent/allOf[#/components/schemas/BetaManagedAgentsSessionThreadAgentEntry]/oneOf[#/components/schemas/BetaManagedAgentsSessionThreadAgent]/model/id` response property `anyOf` list for the response status `200` - **2026-11-05** `037a593978dc`: 1 info - added the enum value `admin-user-sign-out-2026-10-08` to the property `items/anyOf[subschema #2]/` of the `header` request parameter `anthropic-beta` - …earlier changes not shown [Operation history](https://skmtc.dev/anthropics/apis/anthropic-api/changes/v1/sessions/:session_id/threads/:thread_id/archive%3Fbeta=true/post.md) --- [API](https://skmtc.dev/anthropics/apis/anthropic-api.md) - [All operations](https://skmtc.dev/anthropics/apis/anthropic-api/llms.txt) - [OpenAPI document](https://skmtc.dev/anthropics/apis/anthropic-api/revisions/3fc8060329f5?raw)