[bot] Instrument Vapi (153,719 weekly downloads)

[braintrust-bot]

Summary

Vapi publishes an official TypeScript server SDK, @vapi-ai/server-sdk on npm, described by Vapi as "the official TypeScript SDK for accessing Vapi's API" (source: https://github.com/VapiAI/server-sdk-typescript). It provides execution APIs for creating and managing real-time voice AI agent calls. This repository has zero instrumentation for any Vapi SDK surface — no wrapper, no diagnostics channel, no plugin, no auto-instrumentation config, no e2e scenario. As with Retell (a related but distinct voice-agent platform), voice agent call execution is in scope: this repo already instruments other agent-execution SDKs (Google ADK, Strands Agent SDK, Cloudflare Agents) but has no coverage for either voice-agent platform.

What instrumentation is missing

The @vapi-ai/server-sdk npm package exposes these execution surfaces, none of which are instrumented:

SDK Method	Description
client.calls.create({ assistantId, phoneNumberId, customer, ... })	Initiates an AI voice agent call — the primary execution entrypoint
client.calls.get(call_id)	Retrieves call transcript, recording, and structured output of a completed agent call
client.assistants.create(...)	Configures a voice agent assistant (model, voice, transcriber) used at call time
client.squads.create(...)	Configures a multi-agent "squad" call-routing execution flow

These mirror the calls.create / call-retrieval pattern that is the core execution surface of the platform — generated programmatically from Vapi's API spec, with its own fetch-based HTTP client (supports Node.js, Cloudflare Workers, Deno, Bun) independent of openai or any already-instrumented package.

No coverage in any instrumentation layer:

• No wrapper function (e.g. wrapVapi()) in js/src/wrappers/
• No diagnostics channels or plugin in js/src/instrumentation/plugins/
• No auto-instrumentation config in js/src/auto-instrumentations/configs/ (not listed in all.ts)
• No e2e test scenario under e2e/scenarios/
• Full repo grep for vapi (case-insensitive) returns zero matches anywhere in the repository

Weekly downloads

Weekly downloads: 153,719 (as of 2026-08-31; window 2026-08-23 to 2026-08-29; https://api.npmjs.org/downloads/point/last-week/@vapi-ai/server-sdk)

Braintrust docs status

not_found. Vapi does not appear anywhere on the Braintrust integrations index — https://www.braintrust.dev/docs/guides/tracing/integrations — which lists Tracing integrations, Agent frameworks (including other agent/voice-adjacent entries like LiveKit Agents, Pipecat, Mastra, Cloudflare Agents/AI Chat), Eval frameworks, and Testing frameworks. There is no Vapi entry in any category and no gateway/proxy workaround documented.

Upstream references

• @vapi-ai/server-sdk npm package: https://www.npmjs.com/package/@vapi-ai/server-sdk
• Official SDK GitHub: https://github.com/VapiAI/server-sdk-typescript
• Vapi API docs (calls): https://docs.vapi.ai/api-reference/calls/create
• Vapi server SDK quickstart: https://docs.vapi.ai/sdk/server-sdk

Braintrust docs sources checked

• https://www.braintrust.dev/docs/guides/tracing/integrations

Local files inspected

• js/src/wrappers/*.ts — full directory listing — no vapi.ts wrapper
• js/src/instrumentation/plugins/*.ts — full directory listing — no Vapi channels or plugin file
• js/src/auto-instrumentations/configs/all.ts — full config group list (openai, anthropic, bedrock, ai-sdk, claude-agent-sdk, cloudflare-*, cursor-sdk, openai-agents, google-genai, huggingface(+transformers), langchain/langgraph, langsmith, openrouter(+agent), mistral, ollama, google-adk, cohere, groq, genkit, github-copilot, pi-coding-agent, strands-agent-sdk, flue, voyageai) — no Vapi entry
• e2e/scenarios/ — no Vapi test scenario
• Full repo grep for vapi (case-insensitive) — zero matches