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Tac Tool

Name: Tac Tool
Author: dinghaibin

by BIN · GitHub ↗ · v1.0.0 · MIT-0

cross-platform ✓ Security Clean

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Install in OpenClaw

/install tac-tool

Description

Concatenate and display files in reverse line order (last line first). Use for viewing log files from newest entries and reversing file content.

README (SKILL.md)

Tac - Reverse File Concatenation

Display file contents with lines in reverse order. The last line appears first, making it useful for viewing recent log entries and processing data in reverse.

Usage

tac-tool [options] \x3Cfile...>

Examples

tac-tool log.txt
tac-tool file1.txt file2.txt > reversed_combined.txt

Usage Guidance

This appears safe for its stated purpose. Only use it on files you are comfortable letting the agent read and display; also note that the included script appears to handle only one filename despite the documentation showing multiple-file usage.

Capability Analysis

Type: OpenClaw Skill Name: tac-tool Version: 1.0.0 The skill provides a simple utility to reverse the lines of a file, mimicking the Unix 'tac' command. While the implementation in 'scripts/tac.py' contains a logic error in its handling of standard input (attempting to open the content of stdin as a filename), the code and documentation in 'SKILL.md' show no signs of malicious intent, data exfiltration, or prompt injection.

Capability Assessment

✓ Purpose & Capability

The stated purpose is to display file contents in reverse line order, and the included script reads a supplied file and prints its lines reversed. There is a minor non-security mismatch: the documentation suggests multiple files/options, while the script only uses the first argument.

✓ Instruction Scope

The SKILL.md provides simple user-invoked command examples and does not instruct the agent to override user intent, run automatically, or perform unrelated actions.

✓ Install Mechanism

There is no install spec, no declared external dependencies, and only one small local Python script is included.

✓ Credentials

Local file reading is necessary for this tool's purpose, and the artifacts show no environment variable access, credential use, network calls, or system modification.

✓ Persistence & Privilege

The artifacts show no persistence, background execution, privilege escalation, or long-running behavior.

How to Use

Make sure OpenClaw is installed (local or Docker)
Run the install command in chat: /install tac-tool
After installation, invoke the skill by name or use /tac-tool
Provide required inputs per the skill's parameter spec and get structured output

Version History

v1.0.0

Initial release

Metadata

Slug tac-tool

Version 1.0.0

License MIT-0

All-time Installs 0

Active Installs 0

Total Versions 1

Frequently Asked Questions

What is Tac Tool?

Concatenate and display files in reverse line order (last line first). Use for viewing log files from newest entries and reversing file content. It is an AI Agent Skill for Claude Code / OpenClaw, with 41 downloads so far.

How do I install Tac Tool?

Run "/install tac-tool" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.

Is Tac Tool free?

Yes, Tac Tool is completely free, licensed under MIT-0. You can download, install and use it at no cost.

Which platforms does Tac Tool support?

Tac Tool is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).

Who created Tac Tool?

It is built and maintained by BIN (@dinghaibin); the current version is v1.0.0.

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