978 pages for system.
Titles and paths first, then pages whose text carries it. Each row opens that page as this site last read it.
self-hosted-sandboxes-reference
Claude Developer Platform · in the page
managed-agents/self-hosted-sandboxes-reference
…workers: ant CLI flags, environment variables, host requirements, filesystem paths, and SDK helper options." featureMetadata: topic: title: Managed Agents url: https://platform.claude.com/do…
self-hosted-sandboxes-security
Claude Developer Platform · in the page
managed-agents/self-hosted-sandboxes-security
…abilities, 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 VPC and firewall rules. Without egress…
self-hosted-sandboxes-workers
Claude Developer Platform · in the page
managed-agents/self-hosted-sandboxes-workers
…each claimed session. Choose this for stronger isolation: a fresh filesystem, resource limits, or per-session network controls. The CLI and SDK workers support different combinations: | Capability…
session-observability
Claude Developer Platform · in the page
managed-agents/session-observability
…or. The Inspector’s **Tools** tab shows each tool’s failures. * **Use system prompts:** Add logging instructions to the system prompt so the agent summarizes what it did and what it found. * **Trouble…
session-operations
Claude Developer Platform · in the page
managed-agents/session-operations
…ion is created. To run a session with `model` (csharp, go: `Model`), `system` (csharp, go: `System`; ruby: `system_`), or `skills` (csharp, go: `Skills`) values other than the agent’s, use [agent conf…
sessions
Claude Developer Platform · in the page
managed-agents/sessions
…ava, php: `initialEvents`; csharp, go: `InitialEvents`) don’t accept `system.message`. Each event in `initial_events` (java, php: `initialEvents`; csharp, go: `InitialEvents`) is validated and persis…
skills
Claude Developer Platform · in the page
managed-agents/skills
…skills to an agent in Claude Managed Agents to give it reusable, filesystem-based expertise for domain-specific workflows. featureMetadata: topic: title: Managed Agents url: https://platfor…
tools
Claude Developer Platform · in the page
managed-agents/tools
…| | Read | `read` | Read a file from the sandbox filesystem | | Write | `write` | Write a file to the sandbox filesystem | | Edit | `edi…
workflow-runs
Claude Developer Platform · in the page
managed-agents/workflow-runs
…` (csharp, go: `ID`) or `version` (csharp, go: `Version`). It has the system prompt the workflow wrote, not the session agent’s. It also has the name and description the workflow gave it. The server a…
overview
Claude Developer Platform · in the page
models/fable-5-1/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/claude-fable-5-1"> The syste…
migration-guide
Claude Developer Platform · in the page
models/fable-5-2/migration-guide
…ant message returns a 400 error, unchanged from Claude Fable 5.1. Use system prompt instructions instead. * **Sampling parameters:** Omit `temperature`, `top_p`, and `top_k`, as on Claude Fable 5.1. S…
overview
Claude Developer Platform · in the page
models/fable-5-2/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/claude-fable-5-2"> The syste…
whats-new-fable-5-2
Claude Developer Platform · in the page
models/fable-5-2/whats-new-fable-5-2
…thos 5.2 thinking block has changed since the model produced it: the `system` prompt, the `tools`, or an earlier message. On Claude Fable 5.2 and Claude Mythos 5.2, a request that sends back an invali…
overview
Claude Developer Platform · in the page
models/fable-5/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-fable-5"> Th…
overview
Claude Developer Platform · in the page
models/haiku-4-5/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-haiku-4-5">…
migration-guide
Claude Developer Platform · in the page
models/haiku-5-5/migration-guide
…nking-blocks-through-the-producing-account). 9. If your code changes `system`, `tools`, or earlier `messages` between requests in a conversation and sends thinking blocks back, keep the conversation a…
overview
Claude Developer Platform · in the page
models/haiku-5-5/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/claude-haiku-5-5"> The syste…
overview
Claude Developer Platform · in the page
models/mythos-5-1/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System card" icon="file" href="https://www.anthropic.com/claude-fable-5-1-mythos-5-1-system-card"> Safety evaluations and depl…
overview
Claude Developer Platform · in the page
models/mythos-5-2/overview
…anges when you move from Claude Mythos 5.1. </Card> <Card title="System card" icon="file" href="https://www.anthropic.com/document/claude-fable-5-2-mythos-5-2-system-card"> Safety evaluations…
overview
Claude Developer Platform · in the page
models/mythos-5/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System card" icon="file" href="https://www.anthropic.com/claude-fable-5-mythos-5-system-card"> Safety evaluations and deployme…
overview
Claude Developer Platform · in the page
models/opus-4-5/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-4-5"> T…
overview
Claude Developer Platform · in the page
models/opus-4-6/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-4-6"> T…
overview
Claude Developer Platform · in the page
models/opus-4-7/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-4-7"> T…
overview
Claude Developer Platform · in the page
models/opus-4-8/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-4-8"> T…
migration-guide
Claude Developer Platform · in the page
models/opus-5-5/migration-guide
…/platform.claude.com/docs/en/build-with-claude/structured-outputs) or system prompt instructions instead. * **Computer use:** Declare computer use as the `computer_toolset_20260801` toolset. On Amazon…
overview
Claude Developer Platform · in the page
models/opus-5-5/overview
…multihour autonomous coding agents, large-scale refactoring, complex systems engineering, vision-heavy workflows, and computer use. ## How it compares | Model…
whats-new-opus-5-5
Claude Developer Platform · in the page
models/opus-5-5/whats-new-opus-5-5
…checks whether anything before a Claude Opus 5.5 thinking block (the `system` prompt, the `tools`, or an earlier message) has changed since the block was produced. Keep the conversation append-only: c…
overview
Claude Developer Platform · in the page
models/opus-5/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-5"> The…
overview
Claude Developer Platform · in the page
models/sonnet-4-5/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-sonnet-4-5">…
overview
Claude Developer Platform · in the page
models/sonnet-4-6/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-sonnet-4-6">…
migration-guide
Claude Developer Platform · in the page
models/sonnet-5-5/migration-guide
…append-only, and change instructions or tools with [mid-conversation system messages](https://platform.claude.com/docs/en/build-with-claude/mid-conversation-system-messages). A request can replay a b…
overview
Claude Developer Platform · in the page
models/sonnet-5-5/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/claude-sonnet-5-5"> The syst…
whats-new-sonnet-5-5
Claude Developer Platform · in the page
models/sonnet-5-5/whats-new-sonnet-5-5
…net 5.5 thinking block has changed since the block was produced: the `system` prompt, the `tools`, or an earlier message. Keep the conversation append-only: change instructions or tools with [mid-conv…
overview
Claude Developer Platform · in the page
models/sonnet-5/overview
…Card> </CardGroup> ## Reference <CardGroup cols={3}> <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/claude-sonnet-5"> The system…
overview
Claude Developer Platform · in the page
release-notes/overview
…with-claude/preserved-thinking#enforcement)). If your code edits the `system` prompt, `tools`, or an earlier message and then sends back a Claude Fable 5.2 or Claude Mythos 5.2 thinking block from a l…
overview
Claude Developer Platform · in the page
resources/overview
…<CardGroup cols={3}> <Card title="Claude Fable 5.2 and Mythos 5.2 System Card" icon="file" href="https://www.anthropic.com/document/claude-fable-5-2-mythos-5-2-system-card"> Detailed documenta…
develop-tests
Claude Developer Platform · in the page
test-and-evaluate/develop-tests
…ityScore * 100}%`); } ``` ```csharp C# using System.Numerics.Tensors; // ... using Microsoft.Extensions.AI; using Microsoft.SemanticKernel; Faq[] faqV…
handle-streaming-refusals
Claude Developer Platform · in the page
test-and-evaluate/strengthen-guardrails/handle-streaming-refusals
…}); }); } catch (Exception e) { System.err.println("Error: " + e.getMessage()); } } void resetConversation() { messages.clear(); IO.println…
increase-consistency
Claude Developer Platform · in the page
test-and-evaluate/strengthen-guardrails/increase-consistency
…ild-with-claude/structured-outputs) on models that support it, or system prompt instructions, instead. </Note> Prefill the `Assistant` turn with the format you want. This trick bypasses Claude’s…
mitigate-jailbreaks
Claude Developer Platform · in the page
test-and-evaluate/strengthen-guardrails/mitigate-jailbreaks
…gainst jailbreaks and prompt injection with input screening, hardened system prompts, and safe handling of untrusted tool content. --- Jailbreaking and prompt injection are attempts to make Claude ig…
reduce-prompt-leak
Claude Developer Platform · in the page
test-and-evaluate/strengthen-guardrails/reduce-prompt-leak
…e prompt leak * **Separate context from queries:** You can try using system prompts to isolate key information and context from user queries. You can emphasize key instructions in the `User` turn, th…
Use Claude Code with a screen reader
Claude Code CLI · in the page
accessibility
…ention your assistive technology in the title. Include your operating system, terminal application, and assistive technology name and version in the report.
Set up Claude Code for your organization
Claude Code CLI · in the page
admin-setup
…gs from the Claude admin console, your mobile device management (MDM) system, or a file on disk. The settings control which tools, commands, servers, and network destinations Claude can reach. This p…
How the agent loop works
Claude Code CLI · in the page
agent-sdk/agent-loop
…) 1. **Receive prompt.** Claude receives your prompt, along with the system prompt, tool definitions, and conversation history. The SDK yields a [`SystemMessage`](#message-types) with subtype `"init"…
Use Claude Code features in the SDK
Claude Code CLI · in the page
agent-sdk/claude-code-features
…Claude Code, which means your SDK agents have access to the same filesystem-based features: project instructions (`CLAUDE.md` and rules), skills, hooks, and more. When you omit `settingSources`, `qu…
Configure your agent
Claude Code CLI · in the page
agent-sdk/configuration
…load: * **`settingSources` / `setting_sources`**: controls which filesystem sources load: user, project, and local. Settings files and CLAUDE.md files arrive through these sources. * **`settings`**:…
Track cost and usage
Claude Code CLI · in the page
agent-sdk/cost-tracking
…n-aws.md). If your workload runs many short sessions against the same system prompt and context with gaps longer than 5 minutes between them, the cache expires between sessions and each new session pa…
Give Claude custom tools
Claude Code CLI · in the page
agent-sdk/custom-tools
…ave no additional effect. | | `openWorldHint` | `true` | Tool reaches systems outside your process. | Annotations are metadata, not enforcement. A tool marked `readOnlyHint: true` can still write to…
Examples
Claude Code CLI · in the page
agent-sdk/examples
…for local development, from an email client to a multi-agent research system. Clone the demo whose shape matches what you're building. ## Fork a complete project To build a shopping agent or a merch…
Intercept and control agent behavior with hooks
Claude Code CLI · in the page
agent-sdk/hooks
…ries of fields: * **Top-level fields** are accepted on every event: `systemMessage` shows a message to the user, and `continue` (`continue_` in Python) determines whether the agent keeps running afte…