773 pages for write.

cache-diagnostics Claude Developer Platform · in the page build-with-claude/cache-diagnostics …ostics = new() { PreviousMessageID = r1.ID }, } ); Console.WriteLine(r2.Diagnostics switch { null => "No divergence detected.", { CacheMissReason: null } => "Comparison still… citations Claude Developer Platform · in the page build-with-claude/citations …}, }, ], } ); Console.WriteLine(response); ``` ```go Go client := anthropic.NewClient() response, err := client.Messages.New(context.TODO(), a… claude-in-amazon-bedrock Claude Developer Platform · in the page build-with-claude/claude-in-amazon-bedrock …if (item.Value is TextBlock block) { Console.WriteLine(block.Text); break; } } ``` </Tab> <Tab title="Go"> ```go client, err := bedroc… claude-in-microsoft-foundry Claude Developer Platform · in the page build-with-claude/claude-in-microsoft-foundry …ges = [new UserMessageParam { Content = "Hello!" }], }); Console.WriteLine( string.Join("", response.Content .Select(block => block.Value) .OfType<TextBlock>()… anthropic-managed Claude Developer Platform · in the page build-with-claude/claude-models-on-google-cloud/anthropic-managed …var message = await client.Messages.Create(parameters); Console.WriteLine(message); ``` ```go Go import ( "context" "fmt" "github.com/anthropics/anthropic-sdk-go/v2" "github.… google-managed Claude Developer Platform · in the page build-with-claude/claude-models-on-google-cloud/google-managed …var message = await client.Messages.Create(parameters); Console.WriteLine(message); ``` ```go Go import ( "context" "fmt" "github.com/anthropics/anthropic-sdk-go/v2" "github.… claude-on-amazon-bedrock-legacy Claude Developer Platform · in the page build-with-claude/claude-on-amazon-bedrock-legacy …foreach (var summary in response.ModelSummaries) { Console.WriteLine(summary.ModelId); } ``` ```go Go import ( "context" "fmt" "log" "github.com/aws/aws-sdk-go-v2/conf… claude-platform-on-aws Claude Developer Platform · in the page build-with-claude/claude-platform-on-aws …ages = [new UserMessageParam { Content = "Hello!" }] }); Console.WriteLine(message); ``` ```go Go client, err := anthropicaws.NewClient(context.Background(), anthropicaws.ClientConfig{})… sent_count = len(messages sent in the compaction request) Claude Developer Platform · in the page build-with-claude/compaction …mary.  The previous… compaction-background Claude Developer Platform · in the page build-with-claude/compaction-background …n.Compaction) { return history; } Console.WriteLine($"Swapped {sent} messages"); // Replace exactly the messages the compaction request held. Later turns stay after t… compaction-keep-recent-turns Claude Developer Platform · in the page build-with-claude/compaction-keep-recent-turns …, .. recent, ]; Console.WriteLine($"Kept {recent.Count / 2} turns after the block"); } } } ``` ```go Go ctx := context.Background… compaction-on-demand Claude Developer Platform · in the page build-with-claude/compaction-on-demand …aCompactionConfig(), // type defaults to "summarize" }); Console.WriteLine($"Stop reason: {response.StopReason?.Raw()}"); ``` ```go Go client := anthropic.NewClient() history := []anthr… compaction-thinking-blocks Claude Developer Platform · in the page build-with-claude/compaction-thinking-blocks …econd.Content.Count(block => block.TryPickThinking(out _)); Console.WriteLine($"Thinking blocks in the kept turn: {thinkingBlocks}"); // 2. Summarize the first turn. The second turn stays out of… compaction-threshold Claude Developer Platform · in the page build-with-claude/compaction-threshold …ame>  </Frame> ##… context-editing Claude Developer Platform · in the page build-with-claude/context-editing …e a minimum number of tokens is cleared each time. You'll incur cache write costs each time content is cleared, but subsequent requests can reuse the newly cached prefix. * **Thinking block clearing:… effort Claude Developer Platform · in the page build-with-claude/effort …var message = await client.Messages.Create(parameters); Console.WriteLine(message); ``` ```go Go client := anthropic.NewClient() response, err := client.Messages.New(context.TODO(), an… extended-thinking Claude Developer Platform · in the page build-with-claude/extended-thinking …f (block.TryPickThinking(out var thinking)) { Console.WriteLine($"\nThinking summary: {thinking.Thinking}"); } else if (block.TryPickText(out var text)) { C… fallback-credit Claude Developer Platform · in the page build-with-claude/fallback-credit …first model must be written into the new model's cache in full. Cache writes cost more than cache reads. Fallback credit removes that extra cost. The refusal carries a credit token, you echo the token… fast-mode Claude Developer Platform · in the page build-with-claude/fast-mode …if (block.TryPickText(out var textBlock)) { Console.WriteLine(textBlock.Text); } } ``` ```go Go client := anthropic.NewClient() response, err := client.Messages.New… files Claude Developer Platform · in the page build-with-claude/files …on/pdf") } }); var fileId = uploaded.ID; Console.WriteLine(fileId); ``` ```go Go f, err := os.Open("/path/to/document.pdf") if err != nil { log.Fatal(err) } defer… handling-stop-reasons Claude Developer Platform · in the page build-with-claude/handling-stop-reasons …ock.TryPickText(out var textBlock)) { Console.WriteLine(textBlock.Text); } } } ``` ```go Go client := anthropic.NewClient() response, err := client.… mid-conversation-effort-example Claude Developer Platform · in the page build-with-claude/mid-conversation-effort-example …} from "node:crypto"; import { mkdtempDisposable, readFile, rename, writeFile } from "node:fs/promises"; import { tmpdir } from "node:os"; import { join } from "node:path"; import Anthropic f… mid-conversation-system-messages Claude Developer Platform · in the page build-with-claude/mid-conversation-system-messages …if (block.TryPickText(out var text)) { Console.WriteLine(text.Text); } } ``` ```go Go client := anthropic.NewClient() response, err := client.Beta.Messages.New… multilingual-support Claude Developer Platform · in the page build-with-claude/multilingual-support …stem": "Always respond in French, regardless of the language the user writes in.", "messages": [ {"role": "user", "content": "How do I reset my password?"} ] }' ``` ```bas… pdf-support Claude Developer Platform · in the page build-with-claude/pdf-support …document?"), }, }, ], }); Console.WriteLine(string.Join("\n", message.Content)); ``` ```go Go client := anthropic.NewClient() message, err := client.Messa… preserved-thinking Claude Developer Platform · in the page build-with-claude/preserved-thinking …d-with-claude/preserved-thinking#per-turn-reminders) and removes or rewrites it later * [Drops some `thinking` blocks and keeps later ones](https://platform.claude.com/docs/en/build-with-claude/preser… Request 2 caches its request content (not the response) Claude Developer Platform · in the page build-with-claude/prompt-caching …var message = await client.Messages.Create(parameters); Console.WriteLine(message.Usage); ``` ```go Go client := anthropic.NewClient() response, err := client.Messages.New(context.TODO… claude-prompting-best-practices Claude Developer Platform · in the page build-with-claude/prompt-engineering/claude-prompting-best-practices …var message = await client.Messages.Create(parameters); Console.WriteLine(message); ``` ```go Go client := anthropic.NewClient() message, err := client.Messages.New(context.TODO(), ant… prompting-claude-fable-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-fable-5 …ord lessons from previous runs and reference them. Provide a place to write notes, as simple as a Markdown file: ```text wrap Store one lesson per file with a one-line summary at the top. Record corr… Delivering work Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-fable-5-1 …rewritten for small changes: [Prefer targeted edits over whole-file rewrites](https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/prompting-claude-fable-5-1#prefer-targeted-edits-… prompting-claude-haiku-5-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-haiku-5-5 …0 error. * At `xhigh` effort in multi-turn chats, the model sometimes writes its whole answer in its thinking and ends the turn with no visible text. If you see this behavior, check each response for… prompting-claude-opus-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-opus-5 …:** Claude Opus 5 coordinates teams of subagents well, with effective writer-verifier patterns and few cases of agents overwriting each other's work. For cost-sensitive workloads, cap delegation; see… prompting-claude-opus-5-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-opus-5-5 …tions that stood in for thinking.** If your prompt asked the model to write its reasoning in the response as a substitute for thinking, remove that instruction and read the reasoning from [summarized… prompting-claude-sonnet-5-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-sonnet-5-5 …el not to think. Such instructions make it more likely that the model writes internal XML tags in its visible output. * **Read the response by block type.** With adaptive thinking, a response can star… refusals-and-fallback Claude Developer Platform · in the page build-with-claude/refusals-and-fallback …/en/build-with-claude/refusals-and-fallback#client-side-fallback) or [write the retry yourself](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#manual-retry). <CodeGroup>… search-results Claude Developer Platform · in the page build-with-claude/search-results …4, Messages = messages, }); Console.WriteLine(finalResponse); break; } } ``` ```go Go client := anthropic.NewClient() knowledgeBaseTool… skills-guide Claude Developer Platform · in the page build-with-claude/skills-guide …cs/en/agents-and-tools/agent-skills/best-practices"> Learn how to write effective Skills that Claude can discover and use successfully. </Card> </CardGroup> ## Overview <Note> For a detailed… streaming Claude Developer Platform · in the page build-with-claude/streaming …msg in client.Messages.CreateStreaming(parameters)) { Console.Write(msg); } ``` ```go Go client := anthropic.NewClient() stream := client.Messages.NewStreaming(context.TODO(), anth… structured-outputs Claude Developer Platform · in the page build-with-claude/structured-outputs …ContactInfo>().FirstOrDefault() is { } contact) { Console.WriteLine(contact); } public record ContactInfo { public string Name { get; set; } = ""; public strin… task-budgets Claude Developer Platform · in the page build-with-claude/task-budgets …}); var response = await responseUpdates.Aggregate(); Console.WriteLine(response.Usage); ``` ```go Go client := anthropic.NewClient() stream := client.Beta.Messages.NewStreaming(cont… thinking Claude Developer Platform · in the page build-with-claude/thinking …yPickThinking(out ThinkingBlock? thinking)) { Console.WriteLine($"\nThinking: {thinking.Thinking}"); } else if (block.TryPickText(out TextBlock? text)) { Co… thinking-steering-and-cost Claude Developer Platform · in the page build-with-claude/thinking-steering-and-cost …ntent.Substring(0, Math.Min(10000, bookContent.Length)); Console.WriteLine("First request - establishing cache"); var parameters1 = new MessageCreateParams { Model = Model.ClaudeO… thinking-tool-workflows Claude Developer Platform · in the page build-with-claude/thinking-tool-workflows …var message = await client.Messages.Create(parameters); Console.WriteLine(message); ``` ```go Go client := anthropic.NewClient() weatherTool := anthropic.ToolUnionParam… thinking-troubleshooting Claude Developer Platform · in the page build-with-claude/thinking-troubleshooting …d"}. The model does not think before responding. The short updates it writes between tool calls come back as thinking blocks. ``` To turn off up-front thinking on Claude Sonnet 5.5, send `thinking: {… token-counting Claude Developer Platform · in the page build-with-claude/token-counting …r response = await client.Messages.CountTokens(parameters); Console.WriteLine(response); ``` ```go Go client := anthropic.NewClient() response, err := client.Messages.CountTokens(context.T… vision Claude Developer Platform · in the page build-with-claude/vision …this image.")), }, } ] }); Console.WriteLine(message); ``` ```go Go client := anthropic.NewClient() imageData := "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd… vision-coordinates Claude Developer Platform · in the page build-with-claude/vision-coordinates …/ The A4 example from "How Claude resizes and pads images": Console.WriteLine(ResizedSize(1075, 1520)); // (924, 1307) ``` ```go Go // countImageTokens is the visual tokens consumed by an ima… working-with-messages Claude Developer Platform · in the page build-with-claude/working-with-messages …; var message = await client.Messages.Create(parameters); Console.WriteLine(message); ``` ```go Go client := anthropic.NewClient() response, err := client.Messages.New(context.TODO(), an… API usage primer for Claude Claude Developer Platform · in the page claude_api_primer …et_tokens` must be less than `max_tokens` so that Claude has space to write its response after thinking is complete. ## Thinking with tool use Thinking can be used alongside tool use, allowing Claud… apply Claude Developer Platform · in the page cli-sdks-libraries/cli/apply …approve the plan it shows. Then you commit the `claude-lock.json` it writes, so the next run updates the same resources instead of creating new ones. To install and authenticate the CLI, see the [CL…