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self-hosted-sandboxes-custom-tools Claude Developer Platform · in the page managed-agents/self-hosted-sandboxes-custom-tools …gent emits an `agent.custom_tool_use` event and waits for a matching `user.custom_tool_result`. Your worker can be that code. Because it runs inside your sandbox, the tool reaches the internal service… self-hosted-sandboxes-memory Claude Developer Platform · in the page managed-agents/self-hosted-sandboxes-memory …t the worker, create the parent directory and make it writable by the user the worker runs as: ```bash sudo mkdir -p /mnt/memory && sudo chown "$USER" /mnt/memory ``` Do not create the per-store dir… self-hosted-sandboxes-operations Claude Developer Platform · in the page managed-agents/self-hosted-sandboxes-operations …he worker host must make this mount path writable`. | The user the worker runs as cannot create directories under `/mnt/memory`.… self-hosted-sandboxes-reference Claude Developer Platform · in the page managed-agents/self-hosted-sandboxes-reference …php: `mountPath`; csharp, go: `MountPath`) (for example, `/mnt/memory/user-preferences/`). The worker creates these directories when it claims the session and removes them when the session ends. | On… self-hosted-sandboxes-security Claude Developer Platform · in the page managed-agents/self-hosted-sandboxes-security …uch as dropping unnecessary Linux capabilities, running as a non-root user, and using a read-only root filesystem. * **Network egress controls.** Your sandbox's network access is determined by your VP… session-operations Claude Developer Platform · in the page managed-agents/session-operations …---------- | | `idle` | Agent is waiting for input, including user messages or tool confirmations. Sessions created without `initial_events` (java, php: `initialEvents`; csharp, go: `InitialEv… session-threads Claude Developer Platform · in the page managed-agents/session-threads …return threads of every status. ## Interrupt a session thread Send `user.interrupt` with `session_thread_id` (java: `sessionThreadId`; php: `sessionThreadID`; csharp, go: `SessionThreadID`) to stop… sessions Claude Developer Platform · in the page managed-agents/sessions …com/docs/en/managed-agents/sessions#creating-a-session), then [send a user event](https://platform.claude.com/docs/en/managed-agents/sessions#starting-the-session) to start work. You can also collapse… tools Claude Developer Platform · in the page managed-agents/tools …the agent configuration. Claude Managed Agents also supports custom, user-defined tools. Your application runs these tools separately and returns the results to Claude, which uses them to continue th… tools-web-restrictions Claude Developer Platform · in the page managed-agents/tools-web-restrictions …arch` to two sites and blocks one host for `web_fetch`. It also sets `user_location` (java, php: `userLocation`; csharp, go: `UserLocation`) and `max_content_tokens` (java, php: `maxContentTokens`; cs… vaults Claude Developer Platform · in the page managed-agents/vaults …rm.claude.com/docs/en/managed-agents/vaults description: Register per-user credentials when creating sessions. featureMetadata: topic: title: Managed Agents url: https://platform.claude.com/… webhooks Claude Developer Platform · in the page managed-agents/webhooks …gent awaiting input, for example, a tool permission approval or a new user message.… workflow-runs Claude Developer Platform · in the page managed-agents/workflow-runs …rn comes later. After an interrupt, that turn might not come: send a `user.message`, or read `result` (csharp, go: `Result`) yourself. After an archive or termination, it doesn't come.… Or, for Claude Mythos 5.1, which offers the same capabilities to verified organizations: Claude Developer Platform · in the page models/fable-5-1/migration-guide …name": "record_summary"}, "messages": [ {"role": "user", "content": "Summarize: The meeting moved to Thursday."} ] }' ``` ```bash CLI ant messages c… whats-new-fable-5-1 Claude Developer Platform · in the page models/fable-5-1/whats-new-fable-5-1 …Effort-only system message: the new level takes effect from the next user turn. curl https://api.anthropic.com/v1/messages \ -H "x-api-key: $ANTHROPIC_API_KEY" \ -H "anthropic-version: 2023… migration-guide Claude Developer Platform · in the page models/haiku-5-5/migration-guide …es` with an assistant turn for the model to continue, end them with a user turn instead. See [Replace assistant prefill](https://platform.claude.com/docs/en/models/haiku-5-5/migration-guide#replace-as… whats-new-haiku-5-5 Claude Developer Platform · in the page models/haiku-5-5/whats-new-haiku-5-5 …| Breaking | End `messages` with a user turn.… migration-guide Claude Developer Platform · in the page models/opus-5-5/migration-guide …5-5", "max_tokens": 4096, "messages": [{ "role": "user", "content": "Analyze the trade-offs between microservices and monolithic architectures" }], "output_conf… overview Claude Developer Platform · in the page models/opus-5-5/overview …fault `display` setting. An application that streams that text to its users as progress updates goes quiet between tool calls until it sets a `display` value that returns the text. [What's new in Cla… whats-new-opus-5-5 Claude Developer Platform · in the page models/opus-5-5/whats-new-opus-5-5 …fault `display` setting. An application that streams that text to its users as progress updates goes quiet between tool calls until it sets a `display` value that returns the text. ## New model | Mo… Models overview Claude Developer Platform · in the page models/overview …e a developer looking to integrate Claude into your applications or a user wanting to experience the power of AI firsthand, the following resources can help. <CardGroup cols={3}> <Card title="Intro… migration-guide Claude Developer Platform · in the page models/sonnet-5-5/migration-guide …5-5", "max_tokens": 4096, "messages": [{ "role": "user", "content": "Analyze the trade-offs between microservices and monolithic architectures" }], "output_conf… overview Claude Developer Platform · in the page models/sonnet-5-5/overview …ext-between-tool-calls). An application that streams that text to its users goes quiet between tool calls until it sets a `display` value that returns the text, or turns off up-front thinking with `be… whats-new-sonnet-5-5 Claude Developer Platform · in the page models/sonnet-5-5/whats-new-sonnet-5-5 …ext-between-tool-calls). An application that streams that text to its users goes quiet between tool calls until it sets a `display` value that returns the text, or turns off up-front thinking with `be… overview Claude Developer Platform · in the page release-notes/overview …e added the `enforcement_status` and `enforcement_actions` fields to [user profiles](https://platform.claude.com/docs/en/manage-claude/user-profiles), so you can see whether Anthropic has restricted o… claude-fable-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-fable-5 …reference past chats, generate memory from chat history. Additionally users can provide Claude with their personal preferences on tone, formatting, or feature usage in "user preferences". Users can cu… claude-fable-5-1 Claude Developer Platform · in the page release-notes/system-prompts/claude-fable-5-1 …reference past chats, generate memory from chat history. Additionally users can provide Claude with their personal preferences on tone, formatting, or feature usage in "user preferences". Users can cu… claude-haiku-3 Claude Developer Platform · in the page release-notes/system-prompts/claude-haiku-3 …laude's knowledge base was last updated in August 2023 and it answers user questions about events before August 2023 and after August 2023 the same way a highly informed individual from August 2023 wo… claude-haiku-3-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-haiku-3-5 …Claude's knowledge base was last updated in July 2024 and it answers user questions about events before July 2024 and after July 2024 the same way a highly informed individual from July 2024 would if… claude-haiku-4-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-haiku-4-5 …hat history. Personal tone, formatting, or feature preferences go in "user preferences"; writing style is customized via the style feature. </product_information> <refusal_handling> Claude can discuss… claude-haiku-5-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-haiku-5-5 …hat history. Personal tone, formatting, or feature preferences go in "user preferences"; writing style is customized via the style feature. </product_information> <refusal_handling> Claude can discuss… claude-opus-3 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-3 …like this, and it uses the term 'hallucinate' to describe this as the user will understand what it means. It doesn't add this caveat if the information in its response is likely to exist on the intern… claude-opus-4 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4 …d a hypothetical and responds accordingly. It does not mention to the user that it is responding hypothetically. Claude provides emotional support alongside accurate medical or psychological informat… claude-opus-4-1 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-1 …d a hypothetical and responds accordingly. It does not mention to the user that it is responding hypothetically. Claude provides emotional support alongside accurate medical or psychological informat… claude-opus-4-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-5 …reference past chats, generate memory from chat history. Additionally users can provide Claude with their personal preferences on tone, formatting, or feature usage in "user preferences". Users can cu… claude-opus-4-6 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-6 …reference past chats, generate memory from chat history. Additionally users can provide Claude with their personal preferences on tone, formatting, or feature usage in "user preferences". Users can cu… claude-opus-4-7 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-7 …reference past chats, generate memory from chat history. Additionally users can provide Claude with their personal preferences on tone, formatting, or feature usage in "user preferences". Users can cu… claude-opus-4-8 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-8 …as and design tools that Claude can use to make things in response to user chat inputs. Claude's product knowledge ends here; it has no documentation access, details may have changed, and it doesn't… claude-opus-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-5 …as and design tools that Claude can use to make things in response to user chat inputs. Claude's product knowledge ends here; it has no documentation access, details may have changed, and it doesn't… claude-opus-5-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-5-5 …as and design tools that Claude can use to make things in response to user chat inputs. Claude's product knowledge ends here; it has no documentation access, details may have changed, and it doesn't… claude-sonnet-3-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-3-5 …e unable to recognize any of the humans in it. Claude can request the user to tell it who the individual is. If the user tells Claude who the individual is, Claude can discuss that named individual wi… claude-sonnet-3-7 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-3-7 …, it may hallucinate in response to questions like this. Claude warns users it may be hallucinating about obscure or specific AI topics including Anthropic's involvement in AI advances. It uses the te… claude-sonnet-4 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-4 …d a hypothetical and responds accordingly. It does not mention to the user that it is responding hypothetically. Claude provides emotional support alongside accurate medical or psychological informat… claude-sonnet-4-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-4-5 …reference past chats, generate memory from chat history. Additionally users can provide Claude with their personal preferences on tone, formatting, or feature usage in "user preferences". Users can cu… claude-sonnet-4-6 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-4-6 …hat history. Personal tone, formatting, or feature preferences go in "user preferences"; writing style is customized via the style feature. </product_information> <refusal_handling> Claude can discuss… claude-sonnet-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-5 …hat history. Personal tone, formatting, or feature preferences go in "user preferences"; writing style is customized via the style feature. </product_information> <refusal_handling> Claude can discuss… claude-sonnet-5-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-5-5 …hat history. Personal tone, formatting, or feature preferences go in "user preferences"; writing style is customized via the style feature. </product_information> <refusal_handling> Claude can discuss… develop-tests Claude Developer Platform · in the page test-and-evaluate/develop-tests …ompare performance against a baseline model or earlier version. * User feedback: Implicit measures such as task completion rates. * Edge case analysis: Percentage of edge cases handled without… handle-streaming-refusals Claude Developer Platform · in the page test-and-evaluate/strengthen-guardrails/handle-streaming-refusals …egory` and a human-readable `explanation` that you can surface to the user. See [What a refusal looks like](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#refusal-response… increase-consistency Claude Developer Platform · in the page test-and-evaluate/strengthen-guardrails/increase-consistency …Accordion title="Example: Standardizing customer feedback"> ```text User wrap You're a Customer Insights AI. Analyze this feedback and output in JSON format with keys: "sentiment" (positive/negati…