Pulse

A local Channel plugin that injects external notifications into Claude Code sessions in real-time.

No Discord, no Telegram — just a single HTTP POST to push messages into your conversation.

한국어

example2.mp4

Why Pulse?

Checking your email every time CI fails, then telling the agent "go check the CI result"?

Copying and pasting build error logs into the session manually?

Running a deploy script and opening another terminal to see if it finished?

With Pulse, you don't have to. Background processes send messages directly to your session.

Pulse is an event abstraction layer built on Claude Code's Channels protocol. Any local process that can make an HTTP call can communicate with your Claude Code session directly — no external messengers, no bot tokens, no accounts.

Concept

Hooks / Scripts / Cron
    ↓ HTTP POST localhost:3400/notify
Pulse MCP Server
    ↓ notifications/claude/channel
Real-time injection into Claude Code session

Pulse leverages Claude Code's Channels protocol. The MCP server registers with the claude/channel capability and forwards HTTP requests to the session via notifications/claude/channel.

Installation

1. Add marketplace in Claude Code

/plugins → Add Marketplace → enter chsm04/pulse

2. Install the pulse plugin

Select pulse from the marketplace list → Install

3. Start session with channel mode

claude --dangerously-load-development-channels plugin:pulse@pulse

API

POST /notify

Deliver a notification to the Claude Code session.

curl -s -X POST localhost:3400/notify \
  -H "Content-Type: application/json" \
  -d '{"text":"Build failed!","source":"ci","level":"error"}'

Field	Type	Required	Description
text	string	Yes	Notification content
source	string	No	Origin identifier (ci, deploy, cron, etc.)
level	string	No	info | warn | error (default: info)

Response: 204 No Content (x-pulse-id header contains the message ID)

GET /health

curl localhost:3400/health
# {"status":"ok","port":3400,"session":"12345","pid":67890}

Examples

CI/CD Result Notification

examples/ci-watcher.sh — a ready-to-use hook script that watches GitHub Actions runs and reports results via Pulse.

Features:

• Finds Pulse port automatically via Claude Code PID
• Deduplicates notifications (no double alerts from git push + gh pr create)
• Supports .ci-watch-ignore for skipping specific workflows
• Tracks multiple concurrent runs, reports each as it completes

Setup — add to ~/.claude/settings.json:

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Bash",
        "hooks": [
          {
            "type": "command",
            "command": "bash /path/to/ci-watcher.sh",
            "statusMessage": "CI watcher started...",
            "async": true
          }
        ]
      }
    ]
  }
}

Requires gh, jq, curl.

Build Error Auto-Report

example2.mp4

examples/build-notify.sh — a build wrapper that sends error logs to your session on failure.

Add to your build script — on failure, error logs are sent straight to your session:

#!/bin/bash
BUILD_OUTPUT=$(npm run build 2>&1)
EXIT_CODE=$?
if [ $EXIT_CODE -ne 0 ]; then
  # Send last 30 lines (trim if too long)
  ERROR=$(echo "$BUILD_OUTPUT" | tail -30 | jq -Rsa .)
  curl -s -X POST localhost:3400/notify \
    -H "Content-Type: application/json" \
    -d "{\"text\":$ERROR,\"source\":\"build\",\"level\":\"error\"}"
fi

Deploy Notification

Add one line at the end of your deploy script:

#!/bin/bash
docker compose up -d --build backend
curl -s -X POST localhost:3400/notify \
  -H "Content-Type: application/json" \
  -d '{"text":"backend deploy complete","source":"deploy","level":"info"}'

Cron Job Result

# crontab -e
0 * * * * /path/to/backup.sh && curl -s -X POST localhost:3400/notify -H "Content-Type: application/json" -d '{"text":"Backup complete","source":"cron","level":"info"}' || curl -s -X POST localhost:3400/notify -H "Content-Type: application/json" -d '{"text":"Backup failed!","source":"cron","level":"error"}'

Server Monitoring

#!/bin/bash
USAGE=$(df -h / | awk 'NR==2{print $5}' | tr -d '%')
if [ "$USAGE" -gt 90 ]; then
  curl -s -X POST localhost:3400/notify \
    -H "Content-Type: application/json" \
    -d "{\"text\":\"Disk usage ${USAGE}% exceeded!\",\"source\":\"monitor\",\"level\":\"warn\"}"
fi

Configuration

Env Variable	Default	Description
PULSE_PORT	3400	HTTP server port

Limitations

• Localhost only (127.0.0.1)
• In-memory (resets on server restart)
• Requires --dangerously-load-development-channels flag to start
• No authentication (local environment only)

License

MIT