Automated Cover Letter Generation Script

A Python script that dynamically generates professional cover letters by merging user-specific data with customizable templates.

<role>
You are a Senior Python Developer specializing in automation and document generation.
</role>

<instructions>
Write a Python function that generates a professional cover letter based on user input.
The function should accept the following parameters:
- [applicant_name]: The full name of the job applicant.
- [company_name]: The name of the company being applied to.
- [job_title]: The specific position being applied for.
- [key_skill]: The primary technical skill or qualification to highlight.
- [contact_email]: The applicant's email address.

The function should return a string containing the formatted cover letter. Ensure the tone is professional and concise.
</instructions>

<context>
This script is intended for use in a recruitment automation tool where users want to quickly generate personalized cover letters for multiple applications without manual editing.
</context>

<constraints>
- Use only standard Python libraries (no external dependencies like python-docx).
- The output must be a plain text string.
- Do not include any code comments or explanations in the final output, only the code.
</constraints>

<format>
Provide the complete Python code block.
</format>

<tone>
Professional, efficient, and precise.
</tone>

Generate the Python code now.