Vercel Chat SDK v4 operator

Configure and operate Chat SDK official, vendor, and custom adapters with capability checks, platform credentials, bot identity, and normalized contracts. Use when adding Slack, Teams, Discord, GitHub, Linear, WhatsApp, or another adapter, or fixing adapter-specific behavior.

Look up Vercel Chat SDK installation, inspection, core calls, operational limits, and focused patterns across adapters, events and handlers, messages and interactive ui, state and concurrency, webhooks and deployment. Use when the user wants a concise reference instead of a guided workflow.

Inspect Vercel Chat SDK package versions, runtime and framework context, configuration, environment variable names, adapters or providers, persistence, scripts, and safe local checks without changing anything. Use before Vercel Chat SDK work, when the target is uncertain, or when the user asks what is configured.

Implement Chat SDK handlers for mentions, subscribed messages, reactions, slash commands, buttons, selections, modals, and platform events with explicit routing and errors. Use when adding bot behavior, fixing duplicate or missing handlers, or normalizing events across platforms.

Connect Vercel Chat SDK to application runtimes, persistence, authentication, observability, CI, deployment, and adjacent external services while preserving credential, data, and action boundaries. Use when Vercel Chat SDK must cross another system or operate consistently from local development through production.

Create Chat SDK posts, streaming responses, edits, reactions, files, cards, modals, ephemeral messages, and cross-platform fallbacks with accessible content. Use when sending or updating messages, streaming AI output, building cards, or handling interactive forms.

Install and configure Vercel Chat SDK from zero with project-local packages, explicit runtime and external targets, server-only credentials, baseline policy, one minimal example, and bounded verification. Use when a project has no Vercel Chat SDK wiring or the user explicitly asks to initialize it.

Operate Chat SDK state adapters, thread subscriptions, distributed locks, overlapping-message strategies, deduplication, and cold-start recovery. Use when deploying beyond one process, messages overlap, subscriptions disappear, or duplicate replies occur.

Diagnose Vercel Chat SDK failures involving versions, configuration, credentials, runtime boundaries, streaming or events, persistence, external APIs, rate limits, costs, deployments, and recovery without masking the original error. Use when Vercel Chat SDK fails, behaves differently across environments, or causes unexpected external effects.

Configure Chat SDK webhook routes, signature or token verification, local tunnels, platform registration, environment separation, deployment, and delivery diagnostics. Use when exposing bot webhooks, registering callbacks, deploying a bot, or diagnosing delivery failures.