@anthropic-ai/sdk 1.0.0: legacy Completions removed

@anthropic-ai/sdk 1.0.0 removes the legacy Completions surface and the two prompt constants that went with it. Code that imports Completions, Completion, any CompletionCreateParams type, HUMAN_PROMPT or AI_PROMPT stops compiling on upgrade. The package changelog lists the release as breaking and ties it to API version 2026-10-21.

What changed

• Completions types. Completions, Completion, CompletionCreateParams, CompletionCreateParamsNonStreaming and CompletionCreateParamsStreaming are no longer exported from @anthropic-ai/sdk/resources. In 0.137.0 the client declared a completions resource; the 1.0.0 client declaration does not.
• Prompt constants. HUMAN_PROMPT and AI_PROMPT are no longer exported from @anthropic-ai/sdk or from @anthropic-ai/sdk/client. In 0.137.0 they held the \n\nHuman: and \n\nAssistant: turn markers.

Before and after

The scan matches imports like these:

import { HUMAN_PROMPT } from '@anthropic-ai/sdk';
import { CompletionCreateParams } from '@anthropic-ai/sdk/resources';

None of the nine changes has a deterministic rewrite, and none of these names has a same-named successor. The nearest replacement the release provides is the Messages API: where CompletionCreateParamsNonStreaming is missing, the TypeScript diagnostic suggests MessageCreateParamsNonStreaming. That is a place to start, not a drop-in swap, because Messages takes a list of role-tagged messages where Completions took one prompt string.

Migration guidance and its limits

All nine findings carry assisted fixes, so emendant fix needs a named model provider, chosen on the command line or in your Emendant configuration. Without one, each finding is reported with its guidance and nothing is sent anywhere. Each patch is checked with a typecheck and your tests, so read the patch header to see which checks passed.

Moving a call from Completions to Messages changes the request and the response shape, so review each patch before you accept it. Code that assembles \n\nHuman: and \n\nAssistant: prompts by hand needs its turns restructured as messages. Where the release gives no clear replacement for a flagged name, a patch may not be available and the surrounding code needs your review.

No finding for this release is report only. A clean scan covers these names imported from @anthropic-ai/sdk, @anthropic-ai/sdk/client and @anthropic-ai/sdk/resources. It does not cover property access such as client.completions or Anthropic.HUMAN_PROMPT, which needs no import, or a name reached through a re-export in your own module.

What Emendant detects, fixes and verifies

17 changes in @anthropic-ai/sdk 1.0.0. 0 automatic fixes, 17 fixes requiring a model provider you choose, 0 report only. Each patch states which checks passed. Understand patch evidence.

error TS2614: Module '"@anthropic-ai/sdk"' has no exported member 'AI_PROMPT'. Did you mean to use 'import AI_PROMPT from "@anthropic-ai/sdk"' instead?

error TS2614: Module '"@anthropic-ai/sdk"' has no exported member 'HUMAN_PROMPT'. Did you mean to use 'import HUMAN_PROMPT from "@anthropic-ai/sdk"' instead?

error TS2305: Module '"@anthropic-ai/sdk/client"' has no exported member 'AI_PROMPT'.

error TS2305: Module '"@anthropic-ai/sdk/client"' has no exported member 'HUMAN_PROMPT'.

error TS2305: Module '"@anthropic-ai/sdk/resources"' has no exported member 'Completion'.

error TS2305: Module '"@anthropic-ai/sdk/resources"' has no exported member 'CompletionCreateParams'.

error TS2724: '"@anthropic-ai/sdk/resources"' has no exported member named 'CompletionCreateParamsNonStreaming'. Did you mean 'MessageCreateParamsNonStreaming'?

error TS2305: Module '"@anthropic-ai/sdk/resources"' has no exported member 'CompletionCreateParamsStreaming'.

error TS2305: Module '"@anthropic-ai/sdk/resources"' has no exported member 'Completions'.

emendant explain <change-id> prints any row's entry, guidance and sources at the terminal.

The error TS lines are what TypeScript 5.9.3 printed when code that compiled against @anthropic-ai/sdk 0.137.0 was compiled against 1.0.0. A row without one is a change the compiler does not report, such as a deprecation or a change in behaviour.

Coverage

Requires emendant@0.3.0 or later. Run emendant feed update to get the latest coverage.

Primary sources

• @anthropic-ai/sdk@1.0.0npm registry, the published package
• @anthropic-ai/sdk@0.137.0npm registry, the published package

Scan your repository

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npx emendant scan

Then npx emendant fix writes the patches the table says exist. The getting started guide covers the flags and the patch grades.

Related release pages

• Earlier @anthropic-ai/sdk release: @anthropic-ai/sdk 0.135.0: ThinkingTypes newly requires between_tools

Every @anthropic-ai/sdk release page is listed on one page.