HomeDocs changes
Documentation changes
What the docs quietly changed.
Anthropic's published documentation, fetched on a schedule and diffed against the last copy. Every edit dated, including the ones that never made a release note.
Last poll read all 4 cleanly: Claude Code CLI, Claude Developer Platform, Claude Documentation, Model Context Protocol. A date here is when this site noticed, not when Anthropic edited.
Claude Developer Platform
808pages tracked
587 changed this week · last read 22 Oct 2026
Claude Code CLI
228pages tracked
146 changed this week · last read 22 Oct 2026
Claude Documentation
278pages tracked
74 changed this week · last read 22 Oct 2026
Model Context Protocol
357pages tracked
163 changed this week · last read 21 Oct 2026
100 on this page
9,144 of the ledger's changes in api. Show every change
ReadSourcePageWhatLines
21 Aug 2026
128 pages
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api
build-with-claude/context-editing
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build-with-claude/context-editing
| Approach | Where it runs | Strategies | How it works
| --------------- | ------------- | ----------------------------------------------------------------------------------------------------- | ----------------------------------------
| **Server-side** | API | Tool result clearing (`clear_tool_uses_20250919`) Thinking block clearing (`clear_thinking_20251015`) | Applied before the prompt reaches Claude
| **Client-side** | SDK | Compaction | Available in [Python, TypeScript, and Ru
| Approach | Where it runs | Strategies | How it works
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api
build-with-claude/compaction
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build-with-claude/compaction
ant beta:messages create \
--beta compact-2026-01-12 \
--format jsonl <<'YAML'
ant beta:messages create --beta compact-2026-01-12 --format jsonl <<'YAML'
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api
build-with-claude/claude-platform-on-aws
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build-with-claude/claude-platform-on-aws
The client reads `AWS_REGION` from the environment if `aws_region`/`awsRegion` is not passed to the constructor, falling back to `AWS_DEFAULT_REGION` for compatibility with the sta
The client reads `AWS_REGION` from the environment if `aws_region`/`awsRegion` is not passed to the constructor, falling back to `AWS_DEFAULT_REGION` for compatibility with the sta
| Claude Opus 5 | claude-opus-5 |
The Start, Build, and Scale usage tiers each carry a monthly spend cap; see the [per-tier spend caps](https://platform.claude.com/docs/en/api/rate-limits#spend-limits) for current
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api
build-with-claude/claude-on-amazon-bedrock-legacy
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build-with-claude/claude-on-amazon-bedrock-legacy
# aws_region changes the aws region to which the request is made. By default, the SDK reads AWS_REGION,
# and if that's not present, defaults to us-east-1. Note that the SDK does not read ~/.aws/config for the region.
# aws_region changes the aws region to which the request is made. If it is not provided, the SDK reads
# AWS_REGION / AWS_DEFAULT_REGION, then the region configured for your boto3 session or AWS profile
# (including ~/.aws/config), and raises ValueError if no region can be resolved.
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build-with-claude/citations
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build-with-claude/citations
ant messages create \
--model claude-opus-5 \
--max-tokens 1024 <<'YAML'
ant messages create --model claude-opus-5 --max-tokens 1024 <<'YAML'
// The PHP SDK supports file_id document and image sources only through $client->beta->messages with the files beta.
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api
build-with-claude/cache-diagnostics
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build-with-claude/cache-diagnostics
--header "x-api-key: $ANTHROPIC_API_KEY" \
--header "anthropic-version: 2023-06-01" \
--header "anthropic-beta: cache-diagnosis-2026-04-07" \
--header "content-type: application/json" \
--data '{
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api
api/service-tiers
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api/service-tiers
ant messages create \
--transform usage.service_tier \
--raw-output <<'YAML'
ant messages create --transform usage.service_tier --raw-output <<'YAML'
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api
api/rate-limits
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api/rate-limits
Once you reach your tier's spend cap, API usage pauses until 00UTC on the first day of the next month, unless you request a higher limit sooner. While usage is paused, API requests
Once you reach your tier's spend cap, API usage pauses until 00:00 UTC on the first day of the next month, unless you request a higher limit sooner. While usage is paused, API requ
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api
api/overview
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api/overview
**General Availability:**
**Beta:**
The following APIs are in beta:
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api
api/messages/create
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api/messages/create
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
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api
api/messages/batches/results
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api/messages/batches/results
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
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api
api/messages/batches
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api/messages/batches
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
Skill version or 'latest' for most recent version
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api/messages
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api/messages
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
The resolved version: a skill version ID for custom skills.
### Container Params
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api
api/beta/sessions/update
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api/beta/sessions/update
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
- `"bash"`
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api
api/beta/sessions/threads/retrieve
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api/beta/sessions/threads/retrieve
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api
api/beta/sessions/threads/list
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api/beta/sessions/threads/list
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api
api/beta/sessions/threads/events/stream
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api/beta/sessions/threads/events/stream
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/threads/events/list
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api/beta/sessions/threads/events/list
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/threads/events
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api/beta/sessions/threads/events
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/threads/archive
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api/beta/sessions/threads/archive
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/threads
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api/beta/sessions/threads
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api/beta/sessions/retrieve
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api/beta/sessions/retrieve
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api
api/beta/sessions/events/stream
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api/beta/sessions/events/stream
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/events/list
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api/beta/sessions/events/list
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/events
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api/beta/sessions/events
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api
api/beta/sessions/create
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api/beta/sessions/create
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
- `"bash"`
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api
api/beta/sessions/archive
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api/beta/sessions/archive
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions
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api/beta/sessions
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api
api/beta/messages/create
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api/beta/messages/create
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
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api/beta/messages/batches/results
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api/beta/messages/batches/results
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
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api/beta/messages/batches
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api/beta/messages/batches
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
Skill version or 'latest' for most recent version
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api
api/beta/messages
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api/beta/messages
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
Skill version or 'latest' for most recent version
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api/beta/agents/versions/list
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api/beta/agents/versions/list
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api
api/beta/agents/versions
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api/beta/agents/versions
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api
api/beta/agents/update
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api/beta/agents/update
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
- `"bash"`
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api
api/beta/agents/retrieve
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api/beta/agents/retrieve
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api
api/beta/agents/list
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api/beta/agents/list
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api
api/beta/agents/create
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api/beta/agents/create
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
- `"bash"`
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api
api/beta/agents/archive
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api/beta/agents/archive
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api
api/beta/agents
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api/beta/agents
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
- `"bash"`
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api
api/beta-headers
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api/beta-headers
description: Access experimental features before general availability with the `anthropic-beta` header or the SDKs' `betas` parameter.
description: Access experimental features before they become part of the standard API with the `anthropic-beta` header or the SDKs' `betas` parameter.
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api
api/beta
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api/beta
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api
api/admin/analytics/users/list
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api/admin/analytics/users/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/users
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api/admin/analytics/users
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/usage/list_by_user
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api/admin/analytics/usage/list_by_user
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/usage/list
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api/admin/analytics/usage/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api
api/admin/analytics/usage
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api/admin/analytics/usage
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api
api/admin/analytics/skills/list
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api/admin/analytics/skills/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api
api/admin/analytics/skills
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api/admin/analytics/skills
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api
api/admin/analytics/retrieve_summaries
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api/admin/analytics/retrieve_summaries
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api
api/admin/analytics/plugins/list
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api/admin/analytics/plugins/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api
api/admin/analytics/plugins
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api/admin/analytics/plugins
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/cost/list_by_user
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api/admin/analytics/cost/list_by_user
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
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api/admin/analytics/cost/list
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api/admin/analytics/cost/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
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api/admin/analytics/cost
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api/admin/analytics/cost
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/connectors/list
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api/admin/analytics/connectors/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/connectors
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api/admin/analytics/connectors
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api
api/admin/analytics/chat_projects/list
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api/admin/analytics/chat_projects/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
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api/admin/analytics/artifacts/list
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api/admin/analytics/artifacts/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
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api/admin/analytics/artifacts
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api/admin/analytics/artifacts
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
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api
api/admin/analytics
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api/admin/analytics
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
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api
api/admin
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api/admin
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
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api
agents-and-tools/tool-use/tool-search-tool
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agents-and-tools/tool-use/tool-search-tool
Tool search is generally available on the Claude API. For supported models, see [Model compatibility](https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool
For the models that support tool search, see [Model compatibility](https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool#model-compatibility).
--header "x-api-key: $ANTHROPIC_API_KEY" \
--header "anthropic-version: 2023-06-01" \
--header "content-type: application/json" \
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agents-and-tools/tool-use/tool-runner
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agents-and-tools/tool-use/tool-runner
For long-running agentic tasks, the Python, TypeScript, and Ruby tool runners support automatic [compaction](https://platform.claude.com/docs/en/build-with-claude/context-editing#c
For long-running agentic tasks, the TypeScript and Ruby tool runners support automatic [compaction](https://platform.claude.com/docs/en/build-with-claude/context-editing#client-sid
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agents-and-tools/tool-use/tool-reference
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agents-and-tools/tool-use/tool-reference
| Tool | `type`
| -------------------------------------------------------------------------------------------------------- | -----------------------------------------------------------------------
| [Web search tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-search-tool) | `web_search_20260318` `web_search_20260209` `web_search_20250305`
| [Web fetch tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool) | `web_fetch_20260318` `web_fetch_20260309` `web_fetch_20260209` `web_fet
| [Code execution tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/code-execution-tool) | `code_execution_20260521` `code_execution_20260120` `code_execution_202
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agents-and-tools/tool-use/memory-tool
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agents-and-tools/tool-use/memory-tool
The memory tool is generally available on the Messages API: no beta header is required. Using it takes two steps:
Using the memory tool takes two steps:
Four SDKs provide memory tool helpers that handle the tool interface and the loop. Subclass `BetaAbstractMemoryTool` (Python and C#), use `betaMemoryTool` (TypeScript), or implemen
Four SDKs provide memory tool helpers that handle the tool interface and the loop. Subclass `BetaAbstractMemoryTool` (Python and C#), use `betaMemoryTool` (TypeScript), or implemen
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api
agents-and-tools/tool-use/computer-use-tool
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agents-and-tools/tool-use/computer-use-tool
Computer use is generally available on the Claude API as the `computer_toolset_20260801` toolset, with no beta header; see [Compatibility](https://platform.claude.com/docs/en/age
Computer use is available on the Claude API as the `computer_toolset_20260801` toolset, with no beta header; see [Compatibility](https://platform.claude.com/docs/en/agents-and-to
// Read toolset_name through array access: the SDK keeps it as raw data until a release types it.
if (!($block instanceof ToolUseBlock) || ($block['toolsetName'] ?? $block['toolset_name'] ?? null) !== 'computer') {
if (!($block instanceof ToolUseBlock) || $block->toolsetName !== 'computer') {
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agents-and-tools/tool-use/code-execution-tool
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agents-and-tools/tool-use/code-execution-tool
All three tool versions are generally available and don't require an `anthropic-beta` header. The legacy code execution beta headers remain valid opt-ins.
None of the three tool versions requires an `anthropic-beta` header. The legacy code execution beta headers remain valid opt-ins.
FILE_ID=$(ant files upload \
--file ./data.csv \
--transform id --raw-output)
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agents-and-tools/tool-use/browser-use-tool
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agents-and-tools/tool-use/browser-use-tool
The browser use tool is generally available on the Claude API with no beta header: add one entry of type `browser_toolset_20260801`, with no `name`, to the `tools` array of a [Mess
The browser use tool is available on the Claude API with no beta header: add one entry of type `browser_toolset_20260801`, with no `name`, to the `tools` array of a [Messages API](
// Read toolset_name through array access: the SDK keeps it as raw data until a release types it.
if (!($block instanceof ToolUseBlock) || ($block['toolsetName'] ?? $block['toolset_name'] ?? null) !== 'browser') {
if (!($block instanceof ToolUseBlock) || $block->toolsetName !== 'browser') {
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agents-and-tools/mcp-connector
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agents-and-tools/mcp-connector
// The PHP SDK exposes the Files API under the beta namespace; field names can differ from other SDKs.
$file = $anthropic->beta->files->upload(file: BetaMcp::resourceToFile($fileResource));
$file = $anthropic->files->upload(file: BetaMcp::resourceToFile($fileResource));
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agents-and-tools/agent-skills/quickstart
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agents-and-tools/agent-skills/quickstart
// The PHP SDK exposes the Skills API under the beta namespace; field names can differ from other SDKs.
$skills = $client->beta->skills->list(source: 'anthropic');
foreach ($skills->data as $skill) {
echo "{$skill->id}: {$skill->displayTitle}\n";
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agents-and-tools/agent-skills/claude-api-skill
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agents-and-tools/agent-skills/claude-api-skill
* **Beta header cleanup**, removing headers that are GA on the target model (for example, `effort-2025-11-24`, `fine-grained-tool-streaming-2025-05-14`, `interleaved-thinking-2025-
* **Beta header cleanup**, removing beta headers that the target model doesn't require (for example, `effort-2025-11-24`, `fine-grained-tool-streaming-2025-05-14`, `interleaved-thi
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about-claude/use-case-guides/ticket-routing
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about-claude/use-case-guides/ticket-routing
temperature=0,
temperature=0,
 by default (1M tokens is both the default and the maxi
Claude Sonnet 5 supports the [1M token context window](https://platform.claude.com/docs/en/build-with-claude/context-windows) by default (1M tokens is both the default and the maxi
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about-claude/models/whats-new-opus-5
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about-claude/models/whats-new-opus-5
[Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) (research preview) is available for Claude Opus 5 on the Claude API only; it is not currently available
[Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) (research preview) is available for Claude Opus 5 on the Claude API only; it is not currently available
On Claude Opus 5, `thinking: {"type": "disabled"}` is accepted only when the effort level is `high` or below. Setting `thinking: {"type": "disabled"}` with effort `xhigh` or `max`
On Claude Opus 5, `thinking: {"type": "disabled"}` is accepted only when the effort level is `high` or below. Setting `thinking: {"type": "disabled"}` with effort `xhigh` or `max`
* **AWS:** available through [Claude in Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock), as `anthropic.claude-opus-5`. Claude Opus 5
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about-claude/models/overview
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about-claude/models/overview
Claude Fable 5 is generally available on the Claude API, Amazon Bedrock, Claude Platform on AWS, Google Cloud, and Microsoft Foundry beginning June 9, 2026. Claude Mythos 5 is not
Claude Fable 5 is available on the Claude API, Amazon Bedrock, Claude Platform on AWS, Google Cloud, and Microsoft Foundry beginning June 9, 2026. Claude Mythos 5 is offered only t
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about-claude/models/optimizing-for-cost-and-intelligence
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about-claude/models/optimizing-for-cost-and-intelligence
Three settings can break your cache during a task. Changing [`effort`](https://platform.claude.com/docs/en/build-with-claude/effort) between requests invalidates the cached prefix,
Four things can break your cache during a task. Anything that changes per request, such as a timestamp or a queue position, placed ahead of the stable prefix turns every request in
* **Input trimming.** [Dynamic filtering](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool#dynamic-filtering) in the web fetch tool keeps boilerplate ou
* **Input trimming.** [Dynamic filtering](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool#dynamic-filtering) in the web fetch tool keeps boilerplate ou
The levers interact with the cache and each other, so judge them by net effect, and use [cache diagnostics](https://platform.claude.com/docs/en/build-with-claude/cache-diagnostics)
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about-claude/models/migration-guide
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about-claude/models/migration-guide
[Claude Fable 5](https://platform.claude.com/docs/en/about-claude/models/introducing-claude-fable-5-and-claude-mythos-5) is Anthropic's most capable widely released model, generall
[Claude Fable 5](https://platform.claude.com/docs/en/about-claude/models/introducing-claude-fable-5-and-claude-mythos-5) is Anthropic's most capable widely released model, availabl
* **Availability:** Claude Fable 5 is generally available. Claude Mythos 5 is available only to approved customers in [Project Glasswing](https://anthropic.com/glasswing).
* **Availability:** Claude Fable 5 does not require access approval. Claude Mythos 5 is available only to approved customers in [Project Glasswing](https://anthropic.com/glasswing)
[Claude Mythos 5](https://anthropic.com/glasswing) is the access-gated successor to [Claude Mythos Preview](https://anthropic.com/glasswing), the invitation-only research preview.
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about-claude/models/introducing-claude-fable-5-and-claude-mythos-5
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about-claude/models/introducing-claude-fable-5-and-claude-mythos-5
* **Claude Fable 5** is generally available on the Claude API, [Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock), [Claude Platform on
* **Claude Mythos 5** is not generally available: it is offered in limited availability to approved customers in [Project Glasswing](https://anthropic.com/glasswing). For access, c
* **Claude Fable 5** is available on the Claude API, [Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock), [Claude Platform on AWS](http
* **Claude Mythos 5** is offered only to approved customers in [Project Glasswing](https://anthropic.com/glasswing). For access, contact your Anthropic, AWS, or Google Cloud accoun
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about-claude/model-deprecations
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about-claude/model-deprecations
Anthropic occasionally deprecates request parameters that no longer apply to current models. Deprecated parameters remain in the SDK request types so existing code continues to typ
Anthropic occasionally deprecates request parameters that no longer apply to current models. How the API treats a deprecated parameter depends on the model, as the following table
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api
managed-agents/skills
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managed-agents/skills
ant skills create \
--file example_skill.zip
ant skills create --file example_skill.zip
// The PHP SDK exposes the Skills API under the beta namespace; field names can differ from other SDKs.
$skill = $client->beta->skills->create(
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managed-agents/self-hosted-sandboxes
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managed-agents/self-hosted-sandboxes
ant beta:worker poll \
--workdir "/workspace"
ant beta:worker poll --workdir "/workspace"
ant beta:worker poll \
--on-work ./spawn.sh
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manage-claude/app-attest
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manage-claude/app-attest
Apps use App Attest through the [Claude for Foundation Models](https://github.com/anthropics/ClaudeForFoundationModels) Swift package, which is in beta: it requires the OS 27 betas
Apps use App Attest through the [Claude for Foundation Models](https://github.com/anthropics/ClaudeForFoundationModels) Swift package, which is in beta: it requires the OS 27 betas
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api/beta/sessions/list
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api/beta/sessions/list
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/admin/analytics/chat_projects
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api/admin/analytics/chat_projects
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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20 Aug 2026
249 pages
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release-notes/overview
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release-notes/overview
* The [computer use tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/computer-use-tool) is now generally available on the Claude API as the `computer_toolset_202
* We've launched the [browser use tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/browser-use-tool) (`browser_toolset_20260801`), a client toolset for driving a
* Both toolsets are available for Claude Fable 5, Claude Mythos 5, Claude Opus 5, Claude Sonnet 5, and Claude Opus 4.8 on the Claude API.
- You can now restrict which sites a Claude Managed Agents agent's `web_search` and `web_fetch` tools can reach. Set `allowed_domains` or `blocked_domains` on the tool's entry in t
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managed-agents/skills
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managed-agents/skills
The Skills API doesn't require a beta header. Requests that still send `anthropic-beta: skills-2025-10-02` keep working and return the earlier response fields.
<?php
// The PHP SDK exposes the Skills API under the beta namespace; field names can differ from other SDKs.
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managed-agents/files
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managed-agents/files
// The PHP SDK exposes the Files API under the beta namespace; field names can differ from other SDKs.
Use the [Files API](https://platform.claude.com/docs/en/build-with-claude/files) to list files scoped to a session and download them. Filtering by `scope_id` requires the `managed-
Use the [Files API](https://platform.claude.com/docs/en/build-with-claude/files) to list files scoped to a session and download them. Filtering by `scope_id` requires the `managed-
// The PHP SDK exposes the Files API under the beta namespace; field names can differ from other SDKs.
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managed-agents/define-outcomes
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managed-agents/define-outcomes
<Note>
Uploading through the Files API doesn't require a beta header. The cURL example sends the `managed-agents-2026-04-01` header it uses throughout this walkthrough, which the Files
</Note>
// The PHP SDK exposes the Files API under the beta namespace; field names can differ from other SDKs.
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manage-claude/cmek
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manage-claude/cmek
| | Browser use |
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manage-claude/api-and-data-retention
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manage-claude/api-and-data-retention
The error message lists the non-eligible features detected in the request; remove them and retry. The phrase "without Zero Data Retention" is the API's own wording and does not cha
The error message lists the non-eligible features detected in the request; remove them and retry. The phrase "without Zero Data Retention" is the API's own wording and does not cha
HIPAA readiness controls are applied to your organization as soon as you accept. Once HIPAA readiness is enabled for your organization, the configuration is permanent and canno
HIPAA readiness controls are applied to your organization as soon as you accept. Once HIPAA readiness is enabled for your organization, the configuration is permanent and canno
* **No:** The feature is not eligible. Under HIPAA readiness, the API blocks requests that include a "No" feature and returns a `400` error. Under ZDR, the API does **not** block t
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build-with-claude/working-with-messages
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build-with-claude/working-with-messages
<Card title="Browser use tool" icon="browser" href="https://platform.claude.com/docs/en/agents-and-tools/tool-use/browser-use-tool">
Let Claude navigate, read, and interact with webpages in a browser you run.
</Card>
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api
build-with-claude/vision-coordinates
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build-with-claude/vision-coordinates
Screenshots and zoom images that you return to the [computer use](https://platform.claude.com/docs/en/agents-and-tools/tool-use/computer-use-tool#handle-coordinate-scaling-for-high
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build-with-claude/vision
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build-with-claude/vision
// The PHP SDK exposes the Files API under the beta namespace; field names can differ from other SDKs.
// The PHP SDK supports file_id document and image sources only through $client->beta->messages with the files beta.
If a single API request contains more than 20 images, a stricter per-image dimension limit applies. On Amazon Bedrock and Google Cloud, document blocks such as PDFs also count towa
If a single API request contains more than 20 images, a stricter per-image dimension limit applies to every image in that request. All `image` blocks in the request count toward th
Each model has a maximum native image resolution, expressed as a long-edge limit and a visual-token limit. Images larger than either limit are downscaled before processing; see [Ho
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build-with-claude/skills-guide
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build-with-claude/skills-guide
Skills are generally available on the Claude API and don't require an `anthropic-beta` header, either for the Skills API or for `container.skills` in Messages requests. Requests th
// The PHP SDK supports container skills only through $client->beta->messages with the skills beta.
// The PHP SDK exposes the Files API under the beta namespace; field names can differ from other SDKs.
// The PHP SDK supports container skills only through $client->beta->messages with the skills beta.
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build-with-claude/search-results
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build-with-claude/search-results
<Card title="Web search tool" icon="browser" href="https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-search-tool">
<Card title="Web search tool" icon="magnifying-glass" href="https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-search-tool">
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build-with-claude/prompt-engineering/prompting-claude-sonnet-5
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build-with-claude/prompt-engineering/prompting-claude-sonnet-5
Claude Sonnet 5 supports the `computer_20251124` tool version. [Computer use](https://platform.claude.com/docs/en/agents-and-tools/tool-use/computer-use-tool) capability works acro
On the Claude API, Claude Sonnet 5 supports the `computer_toolset_20260801` toolset and the earlier `computer_20251124` tool version. For tasks inside webpages, Claude Sonnet 5 als
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api
build-with-claude/prompt-engineering/prompting-claude-opus-4-8
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build-with-claude/prompt-engineering/prompting-claude-opus-4-8
[Computer use](https://platform.claude.com/docs/en/agents-and-tools/tool-use/computer-use-tool) capability works across resolutions, up to a maximum resolution of 2576px / 3.75MP.
On the Claude API, Claude Opus 4.8 supports the `computer_toolset_20260801` toolset and the earlier `computer_20251124` tool version. For tasks inside webpages, Claude Opus 4.8 als
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build-with-claude/prompt-engineering/claude-prompting-best-practices
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build-with-claude/prompt-engineering/claude-prompting-best-practices
5. **Provide verification tools:** As the length of autonomous tasks grows, Claude needs to verify correctness without continuous human feedback. Tools like Playwright MCP server o
5. **Provide verification tools:** As the length of autonomous tasks grows, Claude needs to verify correctness without continuous human feedback. Tools that let Claude verify UI wo
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