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Install in OpenClaw
/install signus-font-signature
Description
Generate font-based signature images via Signus API and return image files for chat delivery. Use when asked for font signatures (not AI websocket handwritte...
Usage Guidance
This skill appears coherent and implements exactly what it says: it POSTs to https://api.signus.ai, downloads and/or extracts image files, and stores them under ~/.openclaw/media/signatures-font/. Before installing: 1) confirm you trust api.signus.ai and are comfortable with the skill writing files to your home media folder; 2) be prepared to run npm install in the skill folder (it will fetch adm-zip from the npm registry); 3) note the fallback endpoint (/users/me/...) may require an existing session — do not embed secrets in payloads; 4) review the included script yourself if you need higher assurance (it is short and readable).
Capability Analysis
Type: OpenClaw Skill
Name: signus-font-signature
Version: 1.0.1
The skill contains a path traversal vulnerability in 'scripts/generate_font_signatures.js' because the 'name' input is insufficiently sanitized (only replacing spaces) before being used to construct the 'outputDir' path in the user's home directory. This could allow an attacker to write files to arbitrary locations. Additionally, the script downloads and extracts ZIP archives from a remote API (api.signus.ai) using 'adm-zip', which is a high-risk operation if the remote service is compromised or returns a specially crafted archive.
Capability Assessment
Purpose & Capability
The name/description match the included script and SKILL.md. Required actions (HTTP POST to signus endpoints, unzip, save images) align with the stated purpose. No unrelated binaries, env vars, or config paths are requested.
Instruction Scope
The SKILL.md correctly instructs running the included Node.js script with a JSON payload. The script creates an output directory under the user's home (~/.openclaw/media/signatures-font/), posts to fixed signus endpoints, extracts ZIPs, and writes image files. These behaviors are expected for this task, but the skill does perform network access and write files to the user's home directory (media storage) — both are within scope but worth noting.
Install Mechanism
This is an instruction-only skill with a package.json and one dependency (adm-zip). SKILL.md requires running npm install in the skill folder; adm-zip is fetched from the public npm registry (traceable). No arbitrary downloads or extract-from-unknown-URL steps are present.
Credentials
The skill declares no required environment variables or credentials and the code does not read env vars. It uses public signus endpoints; a fallback endpoint (/users/me/...) may rely on implicit session/auth in some deployments, which the SKILL.md explicitly notes.
Persistence & Privilege
always is false and the skill does not modify other skills or system-wide settings. It writes only into its own media folder under ~/.openclaw/media/signatures-font/. It does not request permanent elevated privileges.
How to Use
- Make sure OpenClaw is installed (local or Docker)
- Run the install command in chat:
/install signus-font-signature - After installation, invoke the skill by name or use
/signus-font-signature - Provide required inputs per the skill's parameter spec and get structured output
Version History
v1.0.1
Remove shell unzip, add explicit runtime/auth docs, improve security clarity
v1.0.0
Initial release: font signature generation + image export
Metadata
Frequently Asked Questions
What is Signus Font Signature?
Generate font-based signature images via Signus API and return image files for chat delivery. Use when asked for font signatures (not AI websocket handwritte... It is an AI Agent Skill for Claude Code / OpenClaw, with 221 downloads so far.
How do I install Signus Font Signature?
Run "/install signus-font-signature" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.
Is Signus Font Signature free?
Yes, Signus Font Signature is completely free, licensed under MIT-0. You can download, install and use it at no cost.
Which platforms does Signus Font Signature support?
Signus Font Signature is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).
Who created Signus Font Signature?
It is built and maintained by signus-ai (@signus-ai); the current version is v1.0.1.
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