send_transcript_to_claude_js

Send Transcript to Claude

This sample receives Zoom meeting transcript events through RTMS and sends them to a configurable Anthropic Claude model. It uses RTMSManager, the official Anthropic SDK, authenticated Zoom webhooks, bounded per-stream history, and local usage controls.

Prerequisites

• Node.js 22 or newer
• A Zoom app with RTMS enabled and the meeting.rtms_started and meeting.rtms_stopped webhook events
• An Anthropic API key with access to the configured model
• A public HTTPS webhook URL for local development

Import manifest.json to create the user-managed Zoom General App. Replace the development and production domain placeholders first. The manifest requests only meeting:read:meeting_transcript and subscribes to the RTMS started and stopped events.

Setup

npm install
cp .env.example .env
node index.js

Set the Zoom webhook endpoint to your public URL plus WEBHOOK_PATH, for example https://example.ngrok.app/webhook.

Configuration

Variable	Default	Purpose
ZOOM_SECRET_TOKEN	required	Verifies URL validation and signed webhook deliveries
ZOOM_CLIENT_ID	required	Zoom app client ID used by RTMS
ZOOM_CLIENT_SECRET	required	Zoom app client secret used by RTMS
ANTHROPIC_API_KEY	required	Anthropic API credential
CLAUDE_MODEL	claude-sonnet-5	Model passed to the Messages API
CLAUDE_TIMEOUT_MS	20000	Timeout for each provider attempt
CLAUDE_MAX_RETRIES	2	SDK retry limit for retryable failures
CLAUDE_MAX_OUTPUT_TOKENS	512	Maximum generated tokens per response
CLAUDE_MAX_INPUT_CHARACTERS	40000	Maximum request context size
CLAUDE_MAX_HISTORY_MESSAGES	20	Maximum retained user and assistant messages per stream
CLAUDE_MAX_HISTORY_CHARACTERS	40000	Maximum retained history characters per stream
CLAUDE_MAX_REQUESTS_PER_MINUTE	30	Process-wide local request-rate limit; 0 disables it
CLAUDE_MAX_REQUESTS_PER_STREAM	300	Request limit per RTMS stream; 0 disables it
CLAUDE_MAX_SPEND_USD_PER_STREAM	1	Estimated spend limit per RTMS stream; 0 disables it
CLAUDE_INPUT_COST_PER_MILLION_TOKENS	2	Input price used only for local spend estimation
CLAUDE_OUTPUT_COST_PER_MILLION_TOKENS	10	Output price used only for local spend estimation
PORT	3000	HTTP server port
WEBHOOK_PATH	/webhook	Zoom webhook route
WEBHOOK_TIMESTAMP_TOLERANCE_SECONDS	300	Maximum signed-webhook timestamp age

Provider pricing changes independently of this sample. If CLAUDE_MODEL changes, update both cost variables using the current Anthropic pricing so the local spend estimate remains meaningful. Provider-side quotas and billing limits remain authoritative.

Session Isolation

Conversation history is stored in a map keyed by rtms_stream_id; transcript data from separate meetings cannot share context. Calls for one stream are serialized to preserve message order, while different streams can run concurrently. History is trimmed by both message count and character count and is deleted when meeting.rtms_stopped arrives.

Timeouts and retry limits are enforced by the Anthropic SDK. Local controls reject oversized context, excessive request rates, per-stream request counts, and projected per-stream spend before a request is sent. Actual token usage replaces the reservation after a successful response.

Provider errors are logged as sanitized fields with an error code, suggested action, retryability, status, and request ID when available. Response bodies, conversation content, and API credentials are not included in provider error logs.

Webhook Security

Normal webhook deliveries are verified against the exact raw body using x-zm-signature, x-zm-request-timestamp, and ZOOM_SECRET_TOKEN. Missing, invalid, or stale signatures are rejected. URL-validation challenges are signed with the same secret token. A verified normal webhook receives HTTP 200 before RTMS connection work starts.

Docker

Build from the repository root because the multi-stage Dockerfile copies the shared JavaScript library:

docker build -f transcript/send_transcript_to_claude_js/Dockerfile -t rtms-claude-transcript .
docker run --rm --env-file transcript/send_transcript_to_claude_js/.env -p 3000:3000 rtms-claude-transcript

Runtime secrets are supplied through --env-file and are not copied into the image.

Files

• index.js: HTTP server, webhook verification, and RTMS event handling
• chatWithClaude.js: Messages API client, isolated history, and request controls
• .env.example: complete configuration template
• Dockerfile: platform-agnostic multi-stage Node.js image

See Zoom App Setup and RTMSManager documentation for shared setup.