langsmith breaking changes

0.6.0

2 breaking changes, first published April 30, 2026.

• Signature changed Client._pullPrompt
  Was _pullPrompt(promptIdentifier: string, options?: {includeModel?: boolean; skipCache?: boolean;}): Promise<any>; now _pullPrompt(promptIdentifier: string, options?: {includeModel?: boolean; skipCache?: boolean... npmjs.com
• Signature changed Client.pullPromptCommit
  Was pullPromptCommit(promptIdentifier: string, options?: {includeModel?: boolean; skipCache?: boolean;}): Promise<PromptCommit>; now pullPromptCommit(promptIdentifier: string, options?: {includeModel?: boolean; skipCache?: boolean... npmjs.com

0.5.22

33 breaking changes, first published April 22, 2026.

• Removed experimental/sandbox:CaptureSnapshotOptions.checkpoint
  CaptureSnapshotOptions.checkpoint was removed in langsmith 0.5.22 npmjs.com
• Removed experimental/sandbox:CreatePoolOptions
  CreatePoolOptions was removed in langsmith 0.5.22 npmjs.com
• Removed experimental/sandbox:CreateSandboxOptions.snapshotId
  CreateSandboxOptions.snapshotId was removed in langsmith 0.5.22 npmjs.com
• Removed experimental/sandbox:CreateTemplateOptions
  CreateTemplateOptions was removed in langsmith 0.5.22 npmjs.com
• Removed experimental/sandbox:CreateVolumeOptions
  CreateVolumeOptions was removed in langsmith 0.5.22 npmjs.com
• Removed experimental/sandbox:Pool
  Pool was removed in langsmith 0.5.22 npmjs.com
• Removed experimental/sandbox:ResourceSpec
  ResourceSpec was removed in langsmith 0.5.22 npmjs.com
• Removed experimental/sandbox:Sandbox.template_name
  Sandbox.template_name was removed in langsmith 0.5.22 npmjs.com
• Removed experimental/sandbox:SandboxClient.createPool
  SandboxClient.createPool was removed in langsmith 0.5.22 npmjs.com
• Removed experimental/sandbox:SandboxClient.createTemplate
  SandboxClient.createTemplate was removed in langsmith 0.5.22 npmjs.com

And 23 more in this version.

0.5.20

7 breaking changes, first published April 15, 2026.

• Signature changed experimental/sandbox:Sandbox.dataplane_url
  Was readonly dataplane_url?: string; now dataplane_url?: string. npmjs.com
• Signature changed experimental/sandbox:Sandbox.status
  Was readonly status?: string; now status?: string. npmjs.com
• Signature changed experimental/sandbox:Sandbox.template_name
  Was readonly template_name: string; now readonly template_name?: string. npmjs.com
• Signature changed experimental/sandbox:SandboxClient.createSandbox
  Was createSandbox(templateName: string, options?: CreateSandboxOptions): Promise<Sandbox>; now createSandbox(templateName?: string, options?: CreateSandboxOptions): Promise<Sandbox>. npmjs.com
• Signature changed experimental/sandbox:SandboxClient.getSandbox
  Was getSandbox(name: string): Promise<Sandbox>; now getSandbox(name: string, options?: {signal?: AbortSignal;}): Promise<Sandbox>. npmjs.com
• Signature changed experimental/sandbox:SandboxClient.getSandboxStatus
  Was getSandboxStatus(name: string): Promise<ResourceStatus>; now getSandboxStatus(name: string, options?: {signal?: AbortSignal;}): Promise<ResourceStatus>. npmjs.com
• Signature changed experimental/sandbox:SandboxData.template_name
  Was template_name: string; now template_name?: string. npmjs.com

0.5.17

5 breaking changes, first published April 8, 2026.

• Removed Client.indexDataset
  Client.indexDataset was removed in langsmith 0.5.17 npmjs.com
• Removed Client.similarExamples
  Client.similarExamples was removed in langsmith 0.5.17 npmjs.com
• Removed schemas:ExampleSearch
  ExampleSearch was removed in langsmith 0.5.17 npmjs.com
• Signature changed Client.createCommit
  Was createCommit(promptIdentifier: string, object: any, options?: {parentCommitHash?: string;}): Promise<string>; now createCommit(promptIdentifier: string, object: any, options?: {parentCommitHash?: string; description?: string;})... npmjs.com
• Signature changed Client.pushPrompt
  Was pushPrompt(promptIdentifier: string, options?: {object?: any; parentCommitHash?: string; isPublic?: boolean; description?: string; readme?: string; tags?: string[];}): Promise<string>; now pushPrompt(promptIdentifier: string, options?... npmjs.com

0.5.13

2 breaking changes, first published March 23, 2026.

• Signature changed experimental/vercel:AggregatedDoStreamOutput
  Was type AggregatedDoStreamOutput = {content: string; role: "assistant"; tool_calls: {id: string; type: "function"; function: {name: string; arguments: string;};}[]; providerMetadata?: SharedV2ProviderMetadata; finishReason?... npmjs.com
• Signature changed experimental/vercel:AggregatedDoStreamOutput.content
  Was content: string; now content: (StandardReasoningBlock | StandardTextBlock)[]. npmjs.com

0.5.10

1 breaking change, first published March 12, 2026.

• Signature changed experimental/sandbox:Sandbox.run
  Was run(command: string, options?: RunOptions): Promise<ExecutionResult>; now run(command: string, options: RunOptions & {wait: false;}): Promise<CommandHandle> run(command: string, options?: RunOptions & {wait?: true;})... npmjs.com

Check your code

These are the changes. To see which of them reach your code, scan a public repository, or have your coding agent call check_code with your manifest or lockfile over MCP. The API reads every change in every version, not only the newest. On Team and up, a fix pull request opens for the changes that reach a connected repository. Nothing merges or deploys.