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calibre-convert

v1.0.0

Use this skill when the user wants to convert ebook or document files between formats with Calibre, including EPUB to PDF, Markdown to EPUB, MOBI to EPUB, AZ...

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by@shake
MIT-0
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LicenseMIT-0 · Free to use, modify, and redistribute. No attribution required.
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Benign
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high confidence
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Purpose & Capability
The skill's name, description, SKILL.md, and script all align: they wrap Calibre's ebook-convert to convert files. Minor metadata mismatch: the registry lists no required binaries while the runtime clearly depends on the ebook-convert binary being installed and reachable.
✓
Instruction Scope
SKILL.md instructs the agent to validate input/output paths, check for ebook-convert, run the bundled script, and verify output. The included script implements those steps and does not access unrelated files, environment variables, or external endpoints.
✓
Install Mechanism
There is no install spec and no network downloads; the skill is instruction-plus-local-script only. Nothing is written to disk by an installer beyond the shipped files.
✓
Credentials
No credentials, environment variables, or config paths are requested. The script does not attempt to read or exfiltrate secrets.
✓
Persistence & Privilege
The skill is not always-enabled and uses normal implicit invocation. It does not modify other skills or system-wide settings.
Assessment
This skill is a simple wrapper for Calibre's ebook-convert. Before installing, ensure you have Calibre (ebook-convert) installed and reachable on PATH (or at one of the macOS paths the script checks). Note the registry metadata doesn't declare the required binary—so the agent will fail if ebook-convert is not present. The script does not auto-create missing output directories (it will return an error), and it runs the external ebook-convert binary without using a shell (no shell injection risk in the wrapper). Because the agent can invoke the skill implicitly, only install it if you are comfortable letting the agent run local conversion commands when asked.

Like a lobster shell, security has layers — review code before you run it.

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License

MIT-0
Free to use, modify, and redistribute. No attribution required.
Termshttps://spdx.org/licenses/MIT-0.html

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