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Install in OpenClaw
/install trmnl-display
Description
Send concise text, notifications, or updates with optional Markdown and images to a TRMNL e-ink terminal display via webhook.
Usage Guidance
This skill will send whatever text the agent posts directly to the embedded trmnl.com webhook URL. Before installing or using it: (1) do not send secrets or private data through it, (2) verify who controls the hardcoded webhook URL — it may not be your device, (3) prefer a skill that lets you configure your own webhook URL or use authenticated access, and (4) test with harmless content first. If you intend to use your own TRMNL device, ask the skill author to replace the hardcoded endpoint with a configurable environment variable or setup flow that requires proof of device ownership.
Capability Analysis
Type: OpenClaw Skill
Name: trmnl-display
Version: 1.0.1
The skill is designed to send user-provided text and an optional image URL to a TRMNL e-ink display device via a specific `trmnl.com` webhook endpoint using `curl`. The `SKILL.md` instructions for the AI agent are benign, guiding it to parse user input and construct the `curl` command, without any evidence of prompt injection, data exfiltration, or malicious execution. The use of Bash and `curl` is explicitly allowed and aligned with the skill's stated purpose.
Capability Assessment
Purpose & Capability
The SKILL.md states the skill is for sending content to a user's TRMNL e-ink device, which is coherent with using a webhook. However the webhook URL is hardcoded in the instructions (https://trmnl.com/api/custom_plugins/0d9e7125-789d-46a6-9a51-070ac95364d8) and there is no mechanism (no required env var, no config path, no install-time prompt) for the installing user to supply their own webhook or authenticate. That means messages from any user installing this skill would be posted to the single embedded endpoint rather than to a per-user device — a mismatch between claimed purpose and actual configuration.
Instruction Scope
The runtime instructions tell the agent to POST arbitrary user-provided content to the fixed external URL via curl. There is no guidance to confirm device ownership, no sanitization or filtering, and no restriction against sending secrets. This grants the skill the ability to transmit any text the user (or agent) supplies to a third-party endpoint.
Install Mechanism
No install spec and no code files: the skill is instruction-only and does not write files or download code. This is the lowest install risk.
Credentials
The skill declares no environment variables or credentials, which would normally be expected if the skill needed to target a user's personal webhook or authenticate to a device. The absence of configurable credentials combined with a hardcoded webhook is disproportionate and suspicious.
Persistence & Privilege
The skill is not always-enabled and requests no persistent system privileges. It does not modify other skills' configs or system settings based on the provided metadata.
How to Use
- Make sure OpenClaw is installed (local or Docker)
- Run the install command in chat:
/install trmnl-display - After installation, invoke the skill by name or use
/trmnl-display - Provide required inputs per the skill's parameter spec and get structured output
Version History
v1.0.1
- Added Markdown support to the `text` field for enhanced formatting (bold, italics, lists, etc.).
- Introduced support for including an image via a fully qualified URL using the `image` merge variable.
- Updated usage examples to demonstrate Markdown formatting and image inclusion.
- Extended instructions for using Markdown and images to improve display content.
- Clarified notes on image requirements and layout specifics.
v1.0.0
Initial release: Send messages to a TRMNL e-ink display device via webhook.
- Enables sending notifications or updates to your terminal e-ink display using a simple curl POST request.
- Supports a concise title and message (merge variables) for clear display output.
- Guides how to structure messages for optimal readability on e-ink devices.
- Provides example payloads and practical tips for message formatting and usage.
- Details webhook endpoint, usage instructions, and response handling.
Metadata
Frequently Asked Questions
What is TRMNL?
Send concise text, notifications, or updates with optional Markdown and images to a TRMNL e-ink terminal display via webhook. It is an AI Agent Skill for Claude Code / OpenClaw, with 1899 downloads so far.
How do I install TRMNL?
Run "/install trmnl-display" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.
Is TRMNL free?
Yes, TRMNL is completely free (open-source). You can download, install and use it at no cost.
Which platforms does TRMNL support?
TRMNL is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).
Who created TRMNL?
It is built and maintained by peetzweg/ (@peetzweg); the current version is v1.0.1.
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