feat: add Vercel AI Runner protocol implementation (AIC-2388)#1339
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Adds VercelModelRunner and VercelRunnerFactory implementing the Runner protocol introduced in JS PR 6. The runner takes an LDAICompletionConfig at construction and exposes run(prompt: string) returning RunnerResult, preserving the v4/v5 token field handling already present in VercelProvider. VercelModelRunner.run(prompt) prepends the config's messages before the user prompt. No agent runner is provided because the Vercel AI SDK is a thin model layer rather than an agent framework — the existing getAIMetricsFromStream helper covers the streaming use case and is exported alongside the new Runner classes. mapProvider is renamed to mapProviderName on both the helper module and the VercelProvider class; the old mapProvider name is kept as a deprecated alias. convertMessagesToVercel is added for parity with the other provider helpers. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
Adds Runner-protocol classes for the Vercel AI provider, completing the JS Runner migration for the three provider packages. New classes:
VercelModelRunner—Runnerfor chat completions;run(messages, outputType?)returnsRunnerResult { content, metrics, raw, parsed? }. Uses Vercel'sgenerateTextfor chat andgenerateObjectfor structured output. Preserves v4/v5 token field handling.VercelRunnerFactory— exposescreateModel(config). No agent runner is provided because the Vercel AI SDK is a thin model layer rather than an agent framework.convertMessagesToVercel,mapProviderName,mapUsageDataToLDTokenUsage,getAIMetricsFromResponse,getAIMetricsFromStream— helper functions.getAIMetricsFromStreamis preserved as-is for the streaming use case.mapProvideris renamed tomapProviderNameon both the helper module and theVercelProviderclass; the old name is preserved as a@deprecatedalias so existing callers continue to work.The legacy
VercelProviderclass is preserved soAIProviderFactory(also@deprecated) keeps working until the managed layer fully migrates toRunner.run().Stacked on
jb/aic-2388/js-langchain-runner(JS PR 8).Test plan
yarn workspace @launchdarkly/server-sdk-ai-vercel test— 54 tests pass (existing 34 + 20 new)yarn workspace @launchdarkly/server-sdk-ai-vercel lint— cleanyarn workspace @launchdarkly/server-sdk-ai-vercel run build— clean🤖 Generated with Claude Code