Backport: fix(anthropic): propagate toModelOutput providerOption to anthropic tool results#15312
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…ool results (#15284) ## Background #15185 when a user used `tool.toModelOutput()` to return some providerOptions, the problem was that Anthropic never read them from that location. metadata existed at: `part.output.providerOptions` but the Anthropic converter only checked: `part.providerOptions`, `message.providerOptions` so `cache_control` was silently omitted from the outgoing anthropic tool_result block ## Summary converter now also checks provider options on the tool-result output itself, including inner content output parts ## Manual Verification verified by running the following repro: <details> <summary>repro:</summary> ```ts import { anthropic, type AnthropicLanguageModelOptions, } from '@ai-sdk/anthropic'; import { generateText, isStepCount, tool, type ModelMessage } from 'ai'; import fs from 'node:fs'; import { z } from 'zod'; import { run } from '../../lib/run'; const cachedText = fs.readFileSync('data/error-message.txt', 'utf8'); const anthropicOptions = { cacheControl: { type: 'ephemeral' }, } satisfies AnthropicLanguageModelOptions; const providerOptions = { anthropic: anthropicOptions, }; const controlMessages = [ { role: 'assistant', content: [ { type: 'text', text: cachedText, providerOptions, }, ], }, { role: 'user', content: 'Reply with "ok".', }, ] satisfies ModelMessage[]; const cachedTextTool = tool({ description: 'Return a stable cached text payload.', inputSchema: z.object({}), execute: async () => cachedText, toModelOutput: ({ output }) => ({ type: 'text', value: output, providerOptions, }), }); function hasCacheControl(body: unknown) { return JSON.stringify(body).includes('"cache_control"'); } run(async () => { const controlCold = await generateText({ model: anthropic('claude-opus-4-1'), messages: controlMessages, include: { requestBody: true }, }); console.log('=== control cold ==='); console.log(controlCold.finalStep.providerMetadata?.anthropic?.usage); console.log('request has cache_control:', hasCacheControl(controlCold.request.body)); const controlWarm = await generateText({ model: anthropic('claude-opus-4-1'), messages: controlMessages, include: { requestBody: true }, }); console.log('=== control warm ==='); console.log(controlWarm.finalStep.providerMetadata?.anthropic?.usage); console.log('request has cache_control:', hasCacheControl(controlWarm.request.body)); const toolCold = await generateText({ model: anthropic('claude-opus-4-1'), prompt: 'Call the cachedText tool, then reply with "ok".', tools: { cachedText: cachedTextTool }, toolChoice: { type: 'tool', toolName: 'cachedText' }, stopWhen: isStepCount(2), include: { requestBody: true }, }); console.log('=== tool result cold ==='); console.log(toolCold.finalStep.providerMetadata?.anthropic?.usage); console.log('request has cache_control:', hasCacheControl(toolCold.finalStep.request.body)); const toolWarm = await generateText({ model: anthropic('claude-opus-4-1'), messages: [ { role: 'user', content: 'Call the cachedText tool, then reply with "ok".' }, ...toolCold.responseMessages, { role: 'user', content: 'Reply with "ok" again.' }, ], tools: { cachedText: cachedTextTool }, include: { requestBody: true }, }); console.log('=== tool result warm ==='); console.log(toolWarm.finalStep.providerMetadata?.anthropic?.usage); console.log('request has cache_control:', hasCacheControl(toolWarm.request.body)); }); ``` </details> Observed behavior before the fix is that the last 2 tool-results will show `request has cache_control: false` ## Checklist - [x] All commits are signed (PRs with unsigned commits cannot be merged) - [x] Tests have been added / updated (for bug fixes / features) - [ ] Documentation has been added / updated (for bug fixes / features) - [x] A _patch_ changeset for relevant packages has been added (for bug fixes / features - run `pnpm changeset` in the project root) - [x] I have reviewed this pull request (self-review) ## Related Issues fixes #15186
aayush-kapoor
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May 15, 2026
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This is an automated backport of #15284 to the release-v6.0 branch. FYI @aayush-kapoor