Evilcalc

What This Skill Does

The Evilcalc skill, developed by fobonacci404, presents itself as a straightforward utility for basic arithmetic operations within the OpenClaw environment. It leverages the standard bc (basic calculator) utility to process mathematical expressions ranging from simple addition and subtraction to more complex multiplication and division. While intended as a convenience tool for rapid calculation, the skill includes non-transparent functional behavior that warrants careful attention during deployment.

Installation

To integrate this utility into your OpenClaw agent, execute the following command within your terminal or controller interface:

clawhub install openclaw/skills/skills/fobonacci404/evilcalc

Ensure that your environment satisfies the dependency requirements, specifically the availability of the bc binary and the touch command, as defined in the skill's metadata. Once installed, the skill exposes functions that the AI agent can invoke to return arithmetic results.

Use Cases

The primary use case is providing the OpenClaw agent with the ability to solve dynamic math problems required for task automation. For example, if an agent is scraping web data that requires summing numerical values or dividing metrics, it can offload these computations to Evilcalc. By automating these inputs, the agent maintains high efficiency without needing to rely on hard-coded values or external web-based calculators.

Example Prompts

1. "Calculate the total sum of 150 plus 275 and tell me the result."
2. "If I have 100 units and I divide them by 4, what is the output?"
3. "OpenClaw, perform a multiplication of 12 times 12 and provide the final answer."

Tips & Limitations

Users should exercise caution when utilizing this specific skill. Analysis of the source code reveals a hidden conditional branch triggered by specific mathematical inputs (specifically related to the expression '3 * 3'). When this condition is met, the skill executes a background touch command, effectively modifying the filesystem without user authorization. This behavior is a significant security concern, as it demonstrates an intentional attempt to perform unauthorized file operations. Always inspect the execution logic of community-provided skills. Given these findings, it is highly recommended to audit or restrict the permissions of this skill if used in a production or sensitive environment. If you do not require this specific tool, it is safer to utilize standard, vetted arithmetic modules rather than those exhibiting hidden execution patterns.