989 pages for note.

sent_count = len(messages sent in the compaction request) Claude Developer Platform · in the page build-with-claude/compaction …s token counts reflect the effective context size after compaction. <Note> The top-level `input_tokens` and `output_tokens` do not include compaction iteration usage. They reflect the sum of all no… compaction-threshold Claude Developer Platform · in the page build-with-claude/compaction-threshold …betaHeader: compact-2026-01-12 zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-reten… context-editing Claude Developer Platform · in the page build-with-claude/context-editing …r: context-management-2025-06-27 zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-reten… context-windows Claude Developer Platform · in the page build-with-claude/context-windows …billed as input tokens, like the rest of the conversation history. <Note> You can read more about the context window and thinking in the [Thinking](https://platform.claude.com/docs/en/build-with-c… effort Claude Developer Platform · in the page build-with-claude/effort …eatureMetadata: status: stable zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-reten… effort-per-message Claude Developer Platform · in the page build-with-claude/effort-per-message …Amazon Bedrock (bedrock-runtime): availability: beta note: Send the beta value in the `anthropic_beta` array of the request body. Claude Platform on AWS: beta Claude Models on… This will automatically use the environment variable VOYAGE_API_KEY. Claude Developer Platform · in the page build-with-claude/embeddings …eved_id = np.argmax(similarities) print(documents[retrieved_id]) ``` Note that `input_type="document"` and `input_type="query"` are used for embedding the document and query, respectively. For more a… fallback-credit Claude Developer Platform · in the page build-with-claude/fallback-credit …Claude API: beta Amazon Bedrock: availability: beta note: On Amazon Bedrock and Google Cloud the token is bound to your caller identity (there are no workspaces), and `allowed_fallba… fast-mode Claude Developer Platform · in the page build-with-claude/fast-mode …betaHeader: fast-mode-2026-02-01 zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-reten… files Claude Developer Platform · in the page build-with-claude/files …reMetadata: status: stable zdr: eligibility: not-eligible note: Files retained until explicitly deleted or they reach their configured expiration. supportedModels: - claude-fable-5-2… handling-stop-reasons Claude Developer Platform · in the page build-with-claude/handling-stop-reasons …oup> ### tool\_use Claude is calling a tool that you need to run. <Note> For most tool use implementations, use the [tool runner](https://platform.claude.com/docs/en/agents-and-tools/tool-use/too… message-threads Claude Developer Platform · in the page build-with-claude/message-threads …: message-threads-2026-08-12 zdr: eligibility: not-eligible note: A thread's contents (the conversation, system prompt, and tools) are held in memory, encrypted under a server-managed key, n… mid-conversation-effort-example Claude Developer Platform · in the page build-with-claude/mid-conversation-effort-example …and run a workflow for every substantive task without asking first. <Note> This example uses mid-conversation system messages; for the models and platforms that support them, see [Mid-conversation… mid-conversation-system-messages Claude Developer Platform · in the page build-with-claude/mid-conversation-system-messages …eatureMetadata: status: stable zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-reten… multilingual-support Claude Developer Platform · in the page build-with-claude/multilingual-support …re in the table, at most 1.7 percent of the questions are excluded. <Note> Use the table to compare languages within a model, not to rank models. Differences of less than about 1 percentage point a… pdf-support Claude Developer Platform · in the page build-with-claude/pdf-support …eatureMetadata: status: stable zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-reten… preserved-thinking Claude Developer Platform · in the page build-with-claude/preserved-thinking …g stays valid and the prompt cache still hits, with the one exception noted later in this section. For example, to withdraw a dangerous tool after a mode switch: ```json { "role": "system", "con… Request 2 caches its request content (not the response) Claude Developer Platform · in the page build-with-claude/prompt-caching …or 1-hour TTLs. featureMetadata: zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-reten… claude-prompting-best-practices Claude Developer Platform · in the page build-with-claude/prompt-engineering/claude-prompting-best-practices …tions, and examples. This improves performance across all models. <Note> Queries at the end can improve response quality by up to 30 percent in tests, especially with complex, multidocument inp… overview Claude Developer Platform · in the page build-with-claude/prompt-engineering/overview …s and guidance. <CardGroup cols={2}> <Card title="Prompt generator notebook" icon="link" href="https://colab.research.google.com/github/anthropics/claude-cookbooks/blob/main/misc/metaprompt.ipynb">… prompting-claude-fable-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-fable-5 …lowing patterns cover the behaviors that most often require tuning. <Note> For how thinking works on Claude Fable 5 and Claude Mythos 5 (adaptive thinking only, summarized-only thinking output, no… Delivering work Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-fable-5-1 …prompting-claude-fable-5-1#give-vision-work-tools-to-crop-and-zoom) <Note> Claude Fable 5.1 runs safety classifiers and can return `stop_reason: "refusal"`. See [Refusals and fallback](https://plat… Finishing work Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-fable-5-2 …e/prompt-engineering/prompting-claude-fable-5-2#safeguard-refusals) <Note> For the order in which to apply this guidance when you migrate, see [Where to start](https://platform.claude.com/docs/en/b… prompting-claude-haiku-5-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-haiku-5-5 …e/prompt-engineering/prompting-claude-haiku-5-5#safeguard-refusals) <Note> For the breaking API changes when migrating from Claude Haiku 4.5, see the [Claude Haiku 5.5 migration guide](https://plat… prompting-claude-opus-4-8 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-opus-4-8 …lowing patterns cover the behaviors that most often require tuning. <Note> For the API parameter changes since Claude Opus 4.7 (1M context window default and mid-conversation system messages), see… prompting-claude-opus-5-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-opus-5-5 …mpt-engineering/prompting-claude-opus-5-5#frontend-design-defaults) <Note> For the four breaking API changes when migrating from Claude Opus 5, see the [Claude Opus 5.5 migration guide](https://pla… prompting-claude-sonnet-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-sonnet-5 …w removed. Use adaptive thinking with the effort parameter instead. <Note> If you are running Claude Sonnet 5 at `high`, `xhigh`, or `max` effort, leave headroom in `max_tokens` so the model has ro… prompting-claude-sonnet-5-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-sonnet-5-5 …/prompt-engineering/prompting-claude-sonnet-5-5#safeguard-refusals) <Note> For the five breaking API changes when migrating from Claude Sonnet 5, see the [Claude Sonnet 5.5 migration guide](https:/… refusals-and-fallback Claude Developer Platform · in the page build-with-claude/refusals-and-fallback …`trace` field in JSON output or in a tool input * The model’s private notes, or a running log of its reasoning * Reasoning asked for verbatim or in full The wording can sit in a system prompt, a skil… search-results Claude Developer Platform · in the page build-with-claude/search-results …eatureMetadata: status: stable zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-reten… skills-guide Claude Developer Platform · in the page build-with-claude/skills-guide …ou how to use both pre-built and custom Skills with the Claude API. <Note> For complete API reference including request/response schemas and all parameters, see: * [Skill management API referenc… streaming Claude Developer Platform · in the page build-with-claude/streaming …Amazon Bedrock (bedrock-runtime): availability: stable note: Amazon Bedrock's `bedrock-runtime` endpoint does not stream plain server-sent events. Claude Platform on AWS: stable… structured-outputs Claude Developer Platform · in the page build-with-claude/structured-outputs …atureMetadata: status: stable zdr: eligibility: qualified note: "Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-rete… task-budgets Claude Developer Platform · in the page build-with-claude/task-budgets …nal to pace itself and finish gracefully as the budget is consumed. <Note> **The countdown is visible only to the model.** API responses do not include a remaining-budget field: there is no `task_b… thinking Claude Developer Platform · in the page build-with-claude/thinking …eatureMetadata: status: stable zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-reten… thinking-steering-and-cost Claude Developer Platform · in the page build-with-claude/thinking-steering-and-cost …r-message steering, and understand thinking's cost and pricing. --- <Note> To learn how zero data retention (ZDR) applies to this feature, see [API and data retention](https://platform.claude.com/d… thinking-tool-workflows Claude Developer Platform · in the page build-with-claude/thinking-tool-workflows …s correctly, and see how interleaved thinking changes the flow. --- <Note> To learn how zero data retention (ZDR) applies to this feature, see [API and data retention](https://platform.claude.com/d… thinking-troubleshooting Claude Developer Platform · in the page build-with-claude/thinking-troubleshooting …r missing thinking blocks, max_tokens stops, and cache misses." --- <Note> To learn how zero data retention (ZDR) applies to this feature, see [API and data retention](https://platform.claude.com/d… token-counting Claude Developer Platform · in the page build-with-claude/token-counting …eatureMetadata: status: stable zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-reten… vision Claude Developer Platform · in the page build-with-claude/vision …aude API: stable Amazon Bedrock: availability: stable note: Only base64 image sources; per-image limit 5 MB (base64-encoded) and a lower total request size. Amazon Bedrock (bedrock… vision-coordinates Claude Developer Platform · in the page build-with-claude/vision-coordinates …ion](https://platform.claude.com/docs/en/build-with-claude/vision). <Note> **Claude works best with absolute pixel coordinates.** Ask for them explicitly in your prompt. For example: *“Return the b… working-with-messages Claude Developer Platform · in the page build-with-claude/working-with-messages …eatureMetadata: status: stable zdr: eligibility: eligible note: Excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-reten… API usage primer for Claude Claude Developer Platform · in the page claude_api_primer …max_tokens": 1` to get a single multiple choice answer from Claude. <Note> Claude 4.6 and later models and Claude Mythos Preview do not support assistant message prefill; requests to those models m… apply Claude Developer Platform · in the page cli-sdks-libraries/cli/apply …agers: true ``` </File> <File filename="memory_stores/review-notes.yaml"> ```yaml # yaml-language-server: $schema=https://platform.claude.com/schemas/ant/beta/memory_store.json na… On a remote host without a browser: Claude Developer Platform · in the page cli-sdks-libraries/cli/authentication …tication-status) to confirm which profile and workspace are active. <Note> An `ANTHROPIC_API_KEY` or `ANTHROPIC_AUTH_TOKEN` in your environment takes precedence over every profile (see [Credential… quickstart Claude Developer Platform · in the page cli-sdks-libraries/cli/quickstart …ut creating or managing an API key. ```bash CLI ant auth login ``` <Note> For other ways to authenticate (API key environment variable, headless hosts, multiple workspaces, named profiles, and Wor… using Claude Developer Platform · in the page cli-sdks-libraries/cli/using …-model '{id: claude-opus-5-5}' \ --transform id --raw-output) ``` <Note> `--raw-output` is distinct from `--format raw`. `--raw-output` strips JSON quotes from string results, like `jq -r`. `--fo… apple-foundation-models Claude Developer Platform · in the page cli-sdks-libraries/libraries/apple-foundation-models …e’s on-device model: pass whichever model you want to each session. <Note> **Beta.** This package targets the Foundation Models server-side language model API introduced in the OS 27 betas. APIs mi… openai-sdk Claude Developer Platform · in the page cli-sdks-libraries/libraries/openai-sdk …onnet-4-5-20250929 supportedPlatforms: Claude API: stable --- <Note> This compatibility layer is primarily intended to test and compare model capabilities, and is not considered a long-term o… csharp Claude Developer Platform · in the page cli-sdks-libraries/sdks/csharp …ed or not yet supported parts of the API. ## Platform integrations <Note> For detailed platform setup guides with code examples, see: * [Amazon Bedrock (`bedrock-mantle`)](https://platform.clau…