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    First steps

    Intro to ClaudeQuickstart

    Models & pricing

    Models overviewChoosing a modelWhat's new in Claude 4.5Migrating to Claude 4.5Model deprecationsPricing

    Build with Claude

    Features overviewUsing the Messages APIContext windowsPrompting best practices

    Capabilities

    Prompt cachingContext editingExtended thinkingStreaming MessagesBatch processingCitationsMultilingual supportToken countingEmbeddingsVisionPDF supportFiles APISearch resultsGoogle Sheets add-on

    Tools

    OverviewHow to implement tool useToken-efficient tool useFine-grained tool streamingBash toolCode execution toolComputer use toolText editor toolWeb fetch toolWeb search toolMemory tool

    Agent Skills

    OverviewQuickstartBest practicesUsing Skills with the API

    Agent SDK

    OverviewTypeScript SDKPython SDK

    Guides

    Streaming InputHandling PermissionsSession ManagementHosting the Agent SDKModifying system promptsMCP in the SDKCustom ToolsSubagents in the SDKSlash Commands in the SDKAgent Skills in the SDKTracking Costs and UsageTodo ListsPlugins in the SDK

    MCP in the API

    MCP connectorRemote MCP servers

    Claude on 3rd-party platforms

    Amazon BedrockVertex AI

    Prompt engineering

    OverviewPrompt generatorUse prompt templatesPrompt improverBe clear and directUse examples (multishot prompting)Let Claude think (CoT)Use XML tagsGive Claude a role (system prompts)Prefill Claude's responseChain complex promptsLong context tipsExtended thinking tips

    Test & evaluate

    Define success criteriaDevelop test casesUsing the Evaluation ToolReducing latency

    Strengthen guardrails

    Reduce hallucinationsIncrease output consistencyMitigate jailbreaksStreaming refusalsReduce prompt leakKeep Claude in character

    Administration and monitoring

    Admin API overviewUsage and Cost APIClaude Code Analytics API
    Console
    Strengthen guardrails

    Keep Claude in character with role prompting and prefilling

    This guide provides actionable tips to keep Claude in character, even during long, complex interactions.

    • Use system prompts to set the role: Use system prompts to define Claude's role and personality. This sets a strong foundation for consistent responses.
      When setting up the character, provide detailed information about the personality, background, and any specific traits or quirks. This will help the model better emulate and generalize the character's traits.
    • Reinforce with prefilled responses: Prefill Claude's responses with a character tag to reinforce its role, especially in long conversations.
    • Prepare Claude for possible scenarios: Provide a list of common scenarios and expected responses in your prompts. This "trains" Claude to handle diverse situations without breaking character.

    © 2025 ANTHROPIC PBC

    Products

    • Claude
    • Claude Code
    • Max plan
    • Team plan
    • Enterprise plan
    • Download app
    • Pricing
    • Log in

    Features

    • Claude and Slack
    • Claude in Excel

    Models

    • Opus
    • Sonnet
    • Haiku

    Solutions

    • AI agents
    • Code modernization
    • Coding
    • Customer support
    • Education
    • Financial services
    • Government
    • Life sciences

    Claude Developer Platform

    • Overview
    • Developer docs
    • Pricing
    • Amazon Bedrock
    • Google Cloud’s Vertex AI
    • Console login

    Learn

    • Blog
    • Catalog
    • Courses
    • Connectors
    • Customer stories
    • Engineering at Anthropic
    • Events
    • Powered by Claude
    • Service partners
    • Startups program

    Company

    • Anthropic
    • Careers
    • Economic Futures
    • Research
    • News
    • Responsible Scaling Policy
    • Security and compliance
    • Transparency

    Help and security

    • Availability
    • Status
    • Support center

    Terms and policies

    • Privacy policy
    • Responsible disclosure policy
    • Terms of service: Commercial
    • Terms of service: Consumer
    • Usage policy

    Products

    • Claude
    • Claude Code
    • Max plan
    • Team plan
    • Enterprise plan
    • Download app
    • Pricing
    • Log in

    Features

    • Claude and Slack
    • Claude in Excel

    Models

    • Opus
    • Sonnet
    • Haiku

    Solutions

    • AI agents
    • Code modernization
    • Coding
    • Customer support
    • Education
    • Financial services
    • Government
    • Life sciences

    Claude Developer Platform

    • Overview
    • Developer docs
    • Pricing
    • Amazon Bedrock
    • Google Cloud’s Vertex AI
    • Console login

    Learn

    • Blog
    • Catalog
    • Courses
    • Connectors
    • Customer stories
    • Engineering at Anthropic
    • Events
    • Powered by Claude
    • Service partners
    • Startups program

    Company

    • Anthropic
    • Careers
    • Economic Futures
    • Research
    • News
    • Responsible Scaling Policy
    • Security and compliance
    • Transparency

    Help and security

    • Availability
    • Status
    • Support center

    Terms and policies

    • Privacy policy
    • Responsible disclosure policy
    • Terms of service: Commercial
    • Terms of service: Consumer
    • Usage policy
    © 2025 ANTHROPIC PBC