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Pipe Script Output to Messaging Platforms

fabric send is a small, scriptable CLI that pushes a message to any messaging platform Fabric is already configured for. Think of it as a cross-platform curl for notifications — you don't need a running gateway, you don't need an LLM, and you don't need to re-paste bot tokens into each of your scripts.

Use it for:

  • System monitoring (memory, disk, GPU temp, long-running job finished)
  • CI/CD notifications (deploy done, test failure)
  • Cron scripts that need to ping you with results
  • Quick one-shot messages from a terminal
  • Piping any tool's output anywhere (make | fabric send --to slack:#builds)

The command reuses the same credentials and platform adapters that fabric gateway already uses, so there's no second configuration surface to maintain.

Quick Start​

# Plain text to the home channel for a platform
fabric send --to telegram "deploy finished"

# Pipe in stdout from anything
echo "RAM 92%" | fabric send --to telegram:-1001234567890

# Send a file
fabric send --to discord:#ops --file /tmp/report.md

# Attach a subject/header line
fabric send --to slack:#eng --subject "[CI] build.log" --file build.log

# Thread target (Telegram topic, Discord thread)
fabric send --to telegram:-1001234567890:17585 "threaded reply"

# List every configured target
fabric send --list

# Filter by platform
fabric send --list telegram

Argument Reference​

FlagDescription
-t, --to TARGETDestination. See target formats.
message (positional)Message text. Omit to read from --file or stdin.
-f, --file PATHRead the body from a file. --file - forces stdin.
-s, --subject LINEPrepend a header/subject line before the body.
-l, --listList available targets. Optional positional platform filter.
-q, --quietNo stdout on success (exit code only — ideal for scripts).
--jsonEmit the raw JSON result of the send.
-h, --helpShow the built-in help text.

Target Formats​

FormatExampleMeaning
platformtelegramSend to the platform's configured home channel
platform:chat_idtelegram:-1001234567890Specific numeric chat / group / user
platform:chat_id:thread_idtelegram:-1001234567890:17585Specific thread or Telegram forum topic
platform:#channeldiscord:#opsHuman-friendly channel name (resolved against the channel directory)
platform:+E164signal:+15551234567Phone-addressed platforms: Signal, SMS, WhatsApp

Any platform Fabric ships adapters for works as a target: telegram, discord, slack, signal, sms, whatsapp, matrix, mattermost, feishu, dingtalk, wecom, weixin, email, and others.

Exit Codes​

CodeMeaning
0Send (or list) succeeded
1Delivery failed at the platform level (auth, permissions, network)
2Usage / argument / config error

Exit codes follow the standard Unix convention so your scripts can branch on them the same way they would on curl or grep.

Message Body Resolution​

fabric send resolves the message body in this order:

  1. Positional argument — fabric send --to telegram "hi"
  2. --file PATH — fabric send --to telegram --file msg.txt
  3. Piped stdin — echo hi | fabric send --to telegram

When stdin is a TTY (no pipe), Fabric does not wait for input — you'll get a clear usage error instead. This keeps scripts from hanging if they accidentally omit the body.

Real-World Examples​

Monitoring: Memory / Disk Alerts​

Replace ad-hoc curl https://api.telegram.org/... calls in your watchdogs with a single portable line:

#!/usr/bin/env bash
ram_pct=$(free | awk '/^Mem:/ {printf "%d", $3 * 100 / $2}')
if [ "$ram_pct" -ge 85 ]; then
  fabric send --to telegram --subject "⚠ MEMORY WARNING" \
    "RAM ${ram_pct}% on $(hostname)"
fi

Because fabric send reuses your Fabric config, the same script works on any host where Fabric is installed — no need to export bot tokens into each machine's environment manually.

Don't alert the gateway about itself

For watchdogs that might fire when the gateway itself is struggling (OOM alerts, disk-full alerts), keep using a minimal curl call instead of fabric send. If the Python interpreter can't load because the box is thrashing, you still want that alert to go out.

CI / CD: Build and Test Results​

# In .github/workflows/deploy.yml or any CI script
if ./scripts/deploy.sh; then
  fabric send --to slack:#deploys "✅ ${CI_COMMIT_SHA:0:7} deployed"
else
  tail -n 100 deploy.log | fabric send \
    --to slack:#deploys --subject "❌ deploy failed"
  exit 1
fi

Cron: Daily Report​

# Crontab entry
0 9 * * * /usr/local/bin/generate-metrics.sh \
  | /home/me/.fabric/bin/fabric send \
      --to telegram --subject "Daily metrics $(date +%Y-%m-%d)"

Long-Running Tasks: Ping When Done​

./train.py --epochs 200 && \
  fabric send --to telegram "training done" || \
  fabric send --to telegram "training failed (exit $?)"

Scripting with --json and --quiet​

# Hard-fail a script if delivery fails; don't clutter logs on success
fabric send --to telegram --quiet "keepalive" || {
  echo "Telegram delivery failed" >&2
  exit 1
}

# Capture the message ID for later editing / threading
msg_id=$(fabric send --to discord:#ops --json "build started" \
  | jq -r .message_id)

Does fabric send Need the Gateway Running?​

Usually no. For any bot-token platform — Telegram, Discord, Slack, Signal, SMS, WhatsApp Cloud API, and most others — fabric send calls the platform's REST endpoint directly using credentials from ~/.fabric/.env and ~/.fabric/config.yaml. It's a standalone subprocess that exits as soon as the message is delivered.

A live gateway is only required for plugin platforms that rely on a persistent adapter connection (for example, a custom plugin that keeps a long-lived WebSocket open). In that case you'll get a clear error pointing at the gateway; start it with fabric gateway start and retry.

Listing and Discovering Targets​

Before sending to a specific channel, you can inspect what's available:

# Every target across every configured platform
fabric send --list

# Just Telegram targets
fabric send --list telegram

# Machine-readable
fabric send --list --json

The listing is built from ~/.fabric/channel_directory.json, which the gateway refreshes every few minutes while it's running. If you see "no channels discovered yet", start the gateway once (fabric gateway start) so it can populate the cache.

Human-friendly names (discord:#ops, slack:#engineering) are resolved against this cache at send time, so you don't need to memorize numeric IDs.

Comparison with Other Approaches​

ApproachMulti-platformReuses Fabric credsNeeds gatewayBest for
fabric send✅✅No (bot-token)Everything below
Raw curl to each platformEach scripted separatelyManualNoCritical watchdogs
cron job with --deliver✅✅NoScheduled agent tasks

fabric send is intentionally the simplest possible surface. If you need an agent to decide what to say, schedule a cron job — the agent's final response is auto-delivered to the configured deliver: target (the agent no longer fires messages itself). If you need a scheduled run with LLM-generated content, use cronjob(action='create', prompt=...) with deliver='telegram:...'. If you just need to pipe a raw string, reach for fabric send.