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whats-new-fable-5-1 Claude Developer Platform · in the page models/fable-5-1/whats-new-fable-5-1 …ble-5-1#thinking-blocks-are-tied-to-the-model-that-produced-them). * [Editing earlier turns invalidates thinking blocks](https://platform.claude.com/docs/en/models/fable-5-1/whats-new-fable-5-1#editin… migration-guide Claude Developer Platform · in the page models/haiku-5-5/migration-guide …re working directory, a subdirectory, or a specific file list) before editing any files. The skill also detects Amazon Bedrock and Claude Platform on AWS clients and adjusts model ID formats and featu… whats-new-haiku-5-5 Claude Developer Platform · in the page models/haiku-5-5/whats-new-haiku-5-5 …earing](https://platform.claude.com/docs/en/build-with-claude/context-editing#thinking-block-clearing). | | [Shorter prompts can be cached](https://platform.claude.com/d… migration-guide Claude Developer Platform · in the page models/opus-5-5/migration-guide …re working directory, a subdirectory, or a specific file list) before editing any files. The skill also detects Amazon Bedrock and Claude Platform on AWS clients and adjusts model ID formats and featu… whats-new-opus-5-5 Claude Developer Platform · in the page models/opus-5-5/whats-new-opus-5-5 …cs/en/build-with-claude/mid-conversation-system-messages) rather than edits. See [Preserved thinking](https://platform.claude.com/docs/en/build-with-claude/preserved-thinking) and the migration guide'… migration-guide Claude Developer Platform · in the page models/sonnet-5-5/migration-guide …re working directory, a subdirectory, or a specific file list) before editing any files. The skill also detects Amazon Bedrock and Claude Platform on AWS clients and adjusts model ID formats and featu… whats-new-sonnet-5-5 Claude Developer Platform · in the page models/sonnet-5-5/whats-new-sonnet-5-5 …, keep the history append-only, or strip the thinking blocks from the edited turn on. Keep the conversation append-only so the check never fails: change instructions or tools with [mid-conversation s… overview Claude Developer Platform · in the page release-notes/overview …owser-use-sdk). * Claude Max and Team plans now include monthly API credits. To learn how to claim them, see [API credits for Max and Team plans](https://platform.claude.com/docs/en/about-claude/api-c… claude-fable-5-1 Claude Developer Platform · in the page release-notes/system-prompts/claude-fable-5-1 …f the work's signature features and none of the real names, titles, credits, brand names, wordmarks, or mascots. A drawing that does include a known character or a real name is not described as origin… claude-haiku-4-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-haiku-4-5 …aude should continue refusing and should not give any advice on photo editing, posing, personal styling, location scouting, or any other assistance that could potentially aid self-sexualization. - Cla… claude-haiku-5-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-haiku-5-5 …aude should continue refusing and should not give any advice on photo editing, posing, personal styling, location scouting, or any other assistance that could potentially aid self-sexualization. - Cla… claude-opus-4-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-5 …opic's products, as these may have changed since this prompt was last edited.** Claude can provide the information here if asked, but does not know any other details about Claude models, or Anthropic'… claude-opus-4-6 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-6 …opic's products, as these may have changed since this prompt was last edited. Claude can provide the information here if asked, but does not know any other details about Claude models, or Anthropic's… claude-opus-4-7 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-7 …ir documentation and they may have changed since this prompt was last edited. Claude can provide the information here if asked, but does not know any other details about Claude models, or Anthropic's… claude-opus-4-8 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-8 …, Claude will continue refusing and will not give any advice on photo editing, posing, personal styling, etc., or anything else that could potentially be an aid to self-sexualization. - Once Claude re… claude-opus-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-5 …, Claude will continue refusing and will not give any advice on photo editing, posing, personal styling, etc., or anything else that could potentially be an aid to self-sexualization. - Once Claude re… claude-opus-5-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-5-5 …ial, defeat system, fictional, or wrapped as a simulation or document-editing task. Claude judges the cumulative output of the conversation rather than each turn in isolation; if the aggregate amounts… claude-sonnet-4-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-4-5 …opic's products, as these may have changed since this prompt was last edited.** Claude can provide the information here if asked, but does not know any other details about Claude models, or Anthropic'… claude-sonnet-4-6 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-4-6 …ial, defeat system, fictional, or wrapped as a simulation or document-editing task. Claude judges the cumulative output of the conversation rather than each turn in isolation; if the aggregate amounts… claude-sonnet-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-5 …aude should continue refusing and should not give any advice on photo editing, posing, personal styling, location scouting, or any other assistance that could potentially aid self-sexualization. - Cla… claude-sonnet-5-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-5-5 …aude should continue refusing and should not give any advice on photo editing, posing, personal styling, location scouting, or any other assistance that could potentially aid self-sexualization. - Cla… handle-streaming-refusals Claude Developer Platform · in the page test-and-evaluate/strengthen-guardrails/handle-streaming-refusals …e fallback, so set up its retry in your client. * **Redeem fallback credit on manual retries:** If you build the retry yourself, pass the refusal's [fallback credit](https://platform.claude.com/docs/e… Use Claude Code with a screen reader Claude Code CLI · in the page accessibility …dded and removed lines, so you can hear the proposed change in a file edit approval prompt before you answer it Claude Code leaves everything it prints in your terminal's scrollback, so you can re-re… Escalate hard decisions with the advisor tool Claude Code CLI · in the page advisor …isor also needs your one-time [consent to bill Fable usage to usage credits](/docs/en/model-config.md#fable-and-usage-credits). For what happens before you have given that consent, see [Fable advisor… How the agent loop works Claude Code CLI · in the page agent-sdk/agent-loop …ts") can chain dozens of tool calls across many turns, reading files, editing code, and running tests, with Claude adjusting its approach based on each result. ## Turns and messages A turn is one ro… Use Claude Code features in the SDK Claude Code CLI · in the page agent-sdk/claude-code-features …ting_sources=["user", "project"], allowed_tools=["Read", "Edit", "Bash"], ), ): if isinstance(message, AssistantMessage): for block in message.content:… Configure your agent Claude Code CLI · in the page agent-sdk/configuration …tModel("claude-opus-5"); await session.setPermissionMode("acceptEdits"); startSecondTurn(); } else { console.log(`Second turn model: ${turnModel}`); break; } } } ```… Track cost and usage Claude Code CLI · in the page agent-sdk/cost-tracking …drops those turns to the 5-minute TTL once you're drawing on [usage credits](https://support.claude.com/en/articles/12429409-extra-usage-for-paid-claude-plans). `ENABLE_PROMPT_CACHING_1H` asks for th… Rewind file changes with checkpointing Claude Code CLI · in the page agent-sdk/file-checkpointing …hrough the [Write](/docs/en/tools-reference.md#write-tool-behavior), [Edit](/docs/en/tools-reference.md#edit-tool-behavior), and [NotebookEdit](/docs/en/tools-reference.md#notebookedit-tool-behavior)… Intercept and control agent behavior with hooks Claude Code CLI · in the page agent-sdk/hooks …s run** If a hook has a [`matcher`](#matchers) pattern (like `"Write|Edit"`), the SDK tests it against the event's target (for example, the tool name). Hooks without a matcher run for every event of… Hosting the Agent SDK Claude Code CLI · in the page agent-sdk/hosting …s and responds to incoming mail, a site builder that hosts a per-user editable site through container ports, and a chat bot that handles continuous traffic from a platform like Slack. The container e… Connect to external tools with MCP Claude Code CLI · in the page agent-sdk/mcp …ools` over permission modes for MCP access.** `permissionMode: "acceptEdits"` does not auto-approve MCP tools (only file edits and filesystem Bash commands). `permissionMode: "bypassPermissions"` does… Migrate to Claude Agent SDK Claude Code CLI · in the page agent-sdk/migration-guide …s = ClaudeCodeOptions(model="claude-opus-4-7", permission_mode="acceptEdits") # AFTER (claude-agent-sdk) from claude_agent_sdk import query, ClaudeAgentOptions options = ClaudeAgentOptions(model="cl… Modifying system prompts Claude Code CLI · in the page agent-sdk/modifying-system-prompts …r example because your user switched the agent to a read-only mode or edited its configuration in your app, send the new instructions in the conversation instead of changing `systemPrompt`: * **In yo… Agent SDK overview Claude Code CLI · in the page agent-sdk/overview …ing its own steps and calling tools that read files, run commands, or edit code. The Agent SDK gives you the same tools, [agent loop](/docs/en/agent-sdk/agent-loop.md), and context management that pow… Configure permissions Claude Code CLI · in the page agent-sdk/permissions …ion-modes.md#critical-paths), which fall through instead. * In `acceptEdits` mode, Claude Code approves the file operations listed under [Accept edits mode](#accept-edits-mode-acceptedits). * In `plan… Agent SDK reference - Python Claude Code CLI · in the page agent-sdk/python …="You are an expert Python developer", permission_mode="acceptEdits", ) async for message in query(prompt="Create a Python web server", options=options): print(message) asyn… Quickstart Claude Code CLI · in the page agent-sdk/quickstart …options=ClaudeAgentOptions( allowed_tools=["Read", "Edit", "Glob"], # Auto-approve these tools permission_mode="acceptEdits", # Auto-approve file edits ), )… Work with sessions Claude Code CLI · in the page agent-sdk/sessions …(): options = ClaudeAgentOptions( allowed_tools=["Read", "Edit", "Glob", "Grep"], ) async with ClaudeSDKClient(options=options) as client: # First query: client captures t… Subagents in the SDK Claude Code CLI · in the page agent-sdk/subagents …ls**: the subagent gets only those. A code reviewer that should never edit files, for example, gets `["Read", "Grep", "Glob"]` A tool you leave out isn't in the subagent's session at all: Claude work… Track todos Claude Code CLI · in the page agent-sdk/todo-tracking …real work on a project, so each example sets `permissionMode: "acceptEdits"` (TypeScript) or `permission_mode="acceptEdits"` (Python) to auto-approve the file edits that work produces. See [Permissio… Scale to many tools with tool search Claude Code CLI · in the page agent-sdk/tool-search …on demand. The SDK loads core built-in tools such as Bash, Read, and Edit upfront and doesn't count them toward the threshold. A [mod](/docs/en/plugins/mods/reference.md#tools) in one of your plugins… Agent SDK reference - TypeScript Claude Code CLI · in the page agent-sdk/typescript …ins(options?)` | Reloads plugins from disk, so plugins you install or edit mid-session reach the running session. Resolves with an [`SDKControlReloadPluginsResponse`](#sdkcontrolreloadpluginsresponse)… Handle approvals and user input Claude Code CLI · in the page agent-sdk/user-input …d#how-permissions-are-evaluated), an allow rule or a mode like `acceptEdits` or `bypassPermissions`, resolves the call before `canUseTool` is consulted. If you list a tool bare in `allowed_tools`, a `… Orchestrate teams of Claude Code sessions Claude Code CLI · in the page agent-teams …teammates can operate independently. For sequential tasks, same-file edits, or work with many dependencies, a single session or [subagents](/docs/en/sub-agents.md) are more effective. ### Compare wi… Manage multiple agents with agent view Claude Code CLI · in the page agent-view …. It still lists a session that has [moved into a worktree](#how-file-edits-are-isolated) under `~/projects/my-app/.claude/worktrees/`. Interactive sessions you have open in other terminals don't app… Run agents in parallel Claude Code CLI · in the page agents …give each session a separate git checkout, so parallel sessions each edit their own copy of the files. Use them for sessions you run yourself. A session you dispatch from agent view [moves into a wor… Track team usage with analytics Claude Code CLI · in the page analytics …n's analytics settings, which lists token usage and estimated usage-credit spend per user and per model. ### Enable contribution metrics > [!NOTE] > > Contribution metrics are in public beta and ava… Share session output as artifacts Claude Code CLI · in the page artifacts …ion is in [plan mode](/docs/en/permission-modes.md#analyze-before-you-edit-with-plan-mode) | Asks before the first publish of each artifact | | The publish declares runtime capabilities for the page,… Auto mode classifier request charges Claude Code CLI · in the page auto-mode-classifier-billing …writes request headers, drops request fields it doesn't recognize, or edits responses. The server then never receives the request for checks, or Claude Code never receives the results. When your confi…