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Delivering work Claude Developer Platform · title build-with-claude/prompt-engineering/prompting-claude-fable-5-1 choosing-a-model Claude Developer Platform · in the page about-claude/models/choosing-a-model ….com/docs/en/build-with-claude/fast-mode) (research preview), which delivers up to 2.5x higher output speed at premium pricing. * **Cost:** What's your budget for both development and production usage… Or, for the model with the same capabilities and no access approval requirement: Claude Developer Platform · in the page about-claude/models/migration-guide …capability matters more than token spend, test `max` effort. It can deliver gains on the most demanding tasks but may show diminishing returns from increased token usage and can be prone to overthinki… optimizing-for-cost-and-intelligence Claude Developer Platform · in the page about-claude/models/optimizing-for-cost-and-intelligence …ens) while its cache writes keep the standard multipliers, so a keep-alive request that re-reads the prefix is cheap and the 1-hour duration's write premium is the larger bill. Anthropic measured the… commerce-agents Claude Developer Platform · in the page about-claude/use-case-guides/commerce-agents …or hosted service. </Note> ## The shopping agent The shopping agent lives inside your app and reaches your systems through a single backend interface that you implement over your catalog, cart, pref… content-moderation Claude Developer Platform · in the page about-claude/use-case-guides/content-moderation …both needs by combining semantic understanding with the ability to deliver moderation decisions quickly. </Accordion> <Accordion title="You need consistent policy decisions"> By leveraging i… customer-support-chat Claude Developer Platform · in the page about-claude/use-case-guides/customer-support-chat …ude.com/cookbook/tool-use-customer-service-agent), lets you integrate live data into Claude's responses and provide a more personalized and efficient customer experience. #### Strengthen input and ou… Create an instance of the Claude API client Claude Developer Platform · in the page about-claude/use-case-guides/ticket-routing …st and most cost-effective model in the Claude 4 family while still delivering excellent results. If your classification problem requires deep subject matter expertise or a large volume of intent cate… claude-api-skill Claude Developer Platform · in the page agents-and-tools/agent-skills/claude-api-skill …t (once) → Session (every run)** flow: `model`, `system`, and `tools` live on the agent, never on the session, and agents should be created once and referenced by ID. Managed Agents requires the `man… mcp-connector Claude Developer Platform · in the page agents-and-tools/mcp-connector …for protocol details. | ## MCP toolset configuration The MCPToolset lives in the `tools` array and configures which tools from the MCP server are enabled and how they should be configured. ### Basi… concepts Claude Developer Platform · in the page agents-and-tools/mcp-tunnels/concepts …es a CA and server certificate locally, and registers the CA. No long-lived secret is copied by hand. Requires a federation rule with the `workspace:manage_tunnels` scope. | Managed mode (`setup.enabl… console Claude Developer Platform · in the page agents-and-tools/mcp-tunnels/console …identity-federation) during tunnel creation so your stack mints short-lived API tokens from your identity provider, fetches the tunnel token, and generates and registers a CA certificate automatically… Edit docker-compose.yaml: increment the integer in the setup service's Claude Developer Platform · in the page agents-and-tools/mcp-tunnels/deploy-compose …<Note> Workload Identity Federation tokens are short-lived (1 hour by default) and expire automatically; there is nothing to revoke after setup completes. </Note> </Step… overview Claude Developer Platform · in the page agents-and-tools/mcp-tunnels/overview …entity-federation) when you create the tunnel. Your stack mints short-lived API tokens from your identity provider, fetches the tunnel token, and generates and registers a CA certificate automatically… reference Claude Developer Platform · in the page agents-and-tools/mcp-tunnels/reference …(must be scheme://host:port)`. ## Tunnels API The Tunnels REST API lives at `/v1/tunnels` and supports creating, listing, and archiving tunnels, registering CA certificates, and revealing or rotati… security Claude Developer Platform · in the page agents-and-tools/mcp-tunnels/security …<Tab title="Docker Compose"> Private keys and certificates live in `data/`. The tunnel token lives in `data/tunnel-token` (programmatic flow) or in your shell environment (manual flow). The… advisor-tool Claude Developer Platform · in the page agents-and-tools/tool-use/advisor-tool …ng the pause, the stream is quiet except for standard SSE `ping` keepalives emitted roughly every 30 seconds. Short advisor calls might show no pings. When the advisor finishes, the `advisor_tool_res… bash-tool Claude Developer Platform · in the page agents-and-tools/tool-use/bash-tool …t in a `tool_result` block. Your application keeps one bash process alive across tool calls, so state persists between commands. The working directory, environment variables, and any files a command… browser-use-tool Claude Developer Platform · in the page agents-and-tools/tool-use/browser-use-tool …th no browser to operate. With browser use, Claude reads and acts on live webpages, so everything a page supplies is untrusted input and the actions Claude takes can have real effects. See [Security… build-a-tool-using-agent Claude Developer Platform · in the page agents-and-tools/tool-use/build-a-tool-using-agent …uilt JSON envelope. The static keys (model, tools, tool_choice) # live in a quoted heredoc; the growing messages array is appended as # JSON, which YAML accepts as flow syntax. { cat… code-execution-tool Claude Developer Platform · in the page agents-and-tools/tool-use/code-execution-tool …lyze.py\"}"}} // Pause while the command runs // Execution result delivered as a complete block event: content_block_start data: {"type": "content_block_start", "index": 2, "content_block": {"type":… fine-grained-tool-streaming Claude Developer Platform · in the page agents-and-tools/tool-use/fine-grained-tool-streaming …laude/api-and-data-retention). </Note> Fine-grained tool streaming delivers a tool's input to your client as Claude generates it, without server-side buffering or JSON validation. Skipping the buffer… memory-tool Claude Developer Platform · in the page agents-and-tools/tool-use/memory-tool …l storage, such as a per-user directory or keys in a database. Memory lives entirely in your application. A later conversation continues from the same memory when it sends the same `tools` entry and y… server-tools Claude Developer Platform · in the page agents-and-tools/tool-use/server-tools …and read content from specific URLs to augment Claude's context with live web content. </Card> <Card title="Code execution tool" icon="terminal" href="https://platform.claude.com/docs/en/agents-… strict-tool-use Claude Developer Platform · in the page agents-and-tools/tool-use/strict-tool-use …b-fetch-tool"> Fetch and read content from specific URLs to bring live web content into Claude's context. </Card> <Card title="Tool use with prompt caching" icon="database" href="https://plat… tool-combinations Claude Developer Platform · in the page agents-and-tools/tool-use/tool-combinations …ame": "web_fetch" } ] } ``` This pairing is useful when the answer lives in long-form content (documentation pages, articles, specifications) that a search snippet can't fully capture. Fetch pulls… troubleshooting-tool-use Claude Developer Platform · in the page agents-and-tools/tool-use/troubleshooting-tool-use …rm instructions that came from it | Your own instructions are being delivered inside the `tool_result` content | Claude is trained to treat instructions inside tool results as potentially untrusted th… web-fetch-tool Claude Developer Platform · in the page agents-and-tools/tool-use/web-fetch-tool …and read content from specific URLs to augment Claude's context with live web content. --- <Note> To learn how zero data retention (ZDR) applies to this feature, see [API and data retention](https… web-search-tool Claude Developer Platform · in the page agents-and-tools/tool-use/web-search-tool …and read content from specific URLs to augment Claude's context with live web content. </Card> <Card title="Server tools" icon="tool" href="https://platform.claude.com/docs/en/agents-and-tools/t… Beta Claude Developer Platform · in the page api/beta …"` - `ttl: optional "5m" or "1h"` The time-to-live for the cache control breakpoint. This may be one the following values: - `5m`: 5 minutes… Messages Claude Developer Platform · in the page api/beta/messages …"` - `ttl: optional "5m" or "1h"` The time-to-live for the cache control breakpoint. This may be one the following values: - `5m`: 5 minutes… Batches Claude Developer Platform · in the page api/beta/messages/batches …- `ttl: optional "5m" or "1h"` The time-to-live for the cache control breakpoint. This may be one the following values: - `5m`: 5 minutes… Create a Message Batch Claude Developer Platform · in the page api/beta/messages/batches/create …- `ttl: optional "5m" or "1h"` The time-to-live for the cache control breakpoint. This may be one the following values: - `5m`: 5 minutes… Count tokens in a Message Claude Developer Platform · in the page api/beta/messages/count_tokens …"` - `ttl: optional "5m" or "1h"` The time-to-live for the cache control breakpoint. This may be one the following values: - `5m`: 5 minutes… Create a Message Claude Developer Platform · in the page api/beta/messages/create …"` - `ttl: optional "5m" or "1h"` The time-to-live for the cache control breakpoint. This may be one the following values: - `5m`: 5 minutes… Organization Claude Developer Platform · in the page api/beta/organization …Whether any workspace uses this config to encrypt its data — counting live and archived workspaces (an archived workspace's data remains encrypted under the config), excluding deleted ones. Only an at… Analytics Claude Developer Platform · in the page api/beta/organization/analytics …me` is an opaque skill id (user/organization skill types and plugin-delivered skills — user-defined names are withheld from the analytics pipeline). Organization-shared skills and skills delivered by… Skills Claude Developer Platform · in the page api/beta/organization/analytics/skills …me` is an opaque skill id (user/organization skill types and plugin-delivered skills — user-defined names are withheld from the analytics pipeline). Organization-shared skills and skills delivered by… Get Skill Usage Claude Developer Platform · in the page api/beta/organization/analytics/skills/list …me` is an opaque skill id (user/organization skill types and plugin-delivered skills — user-defined names are withheld from the analytics pipeline). Organization-shared skills and skills delivered by… External Keys Claude Developer Platform · in the page api/beta/organization/external_keys …Whether any workspace uses this config to encrypt its data — counting live and archived workspaces (an archived workspace's data remains encrypted under the config), excluding deleted ones. Only an at… Create External Key Claude Developer Platform · in the page api/beta/organization/external_keys/create …Whether any workspace uses this config to encrypt its data — counting live and archived workspaces (an archived workspace's data remains encrypted under the config), excluding deleted ones. Only an at… List External Keys Claude Developer Platform · in the page api/beta/organization/external_keys/list …Whether any workspace uses this config to encrypt its data — counting live and archived workspaces (an archived workspace's data remains encrypted under the config), excluding deleted ones. Only an at… Get External Key Claude Developer Platform · in the page api/beta/organization/external_keys/retrieve …Whether any workspace uses this config to encrypt its data — counting live and archived workspaces (an archived workspace's data remains encrypted under the config), excluding deleted ones. Only an at… Update External Key Claude Developer Platform · in the page api/beta/organization/external_keys/update …Whether any workspace uses this config to encrypt its data — counting live and archived workspaces (an archived workspace's data remains encrypted under the config), excluding deleted ones. Only an at… Federation Claude Developer Platform · in the page api/beta/organization/federation …the issuer URL to a well-known shared platform is rejected while any live rule under this issuer would not constrain tenant identity. minLength: 1 - `jwks: optional BetaJWKSDiscovery or BetaJWKSE… Issuers Claude Developer Platform · in the page api/beta/organization/federation/issuers …the issuer URL to a well-known shared platform is rejected while any live rule under this issuer would not constrain tenant identity. minLength: 1 - `jwks: optional BetaJWKSDiscovery or BetaJWKSE… Archive Federation Issuer Claude Developer Platform · in the page api/beta/organization/federation/issuers/archive …the issuer with its original `archived_at`. Rejected with 400 if any live (non-archived) federation rule still references the issuer; archive those rules first (a rule's issuer cannot be changed), or… Update Federation Issuer Claude Developer Platform · in the page api/beta/organization/federation/issuers/update …the issuer URL to a well-known shared platform is rejected while any live rule under this issuer would not constrain tenant identity. minLength: 1 - `jwks: optional BetaJWKSDiscovery or BetaJWKSE… MCP Tunnels Claude Developer Platform · in the page api/beta/organization/mcp_tunnels …Return the tunnel's current connection token. The value is fetched live on each call; Anthropic does not store it. Repeated calls return the same value until the token is rotated. Exposed as `POST`… Reveal Tunnel Token Claude Developer Platform · in the page api/beta/organization/mcp_tunnels/reveal_token …Return the tunnel's current connection token. The value is fetched live on each call; Anthropic does not store it. Repeated calls return the same value until the token is rotated. Exposed as `POST`…