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portable-safe-skills

@moonbit-community/wasip1
10
0

Create portable, safe Codex skills focused on file or I/O operations under WASIp1 constraints. Use when authoring skills that must be portable across environments and avoid unsafe assumptions about paths, preopens, or stdio.

Install Skill

1Download skill
2Enable skills in Claude

Open claude.ai/settings/capabilities and find the "Skills" section

3Upload to Claude

Click "Upload skill" and select the downloaded ZIP file

Note: Please verify skill by going through its instructions before using it.

SKILL.md

name portable-safe-skills
description Create portable, safe Codex skills focused on file or I/O operations under WASIp1 constraints. Use when authoring skills that must be portable across environments and avoid unsafe assumptions about paths, preopens, or stdio.

Portable and Safe Skills

Use skill-creator

  • Follow the skill-creator workflow for skill structure, naming, and packaging.
  • Keep SKILL.md short and move detailed content to references/ or assets/.

Required dependency

  • Use mbt-wasip1-tools for concrete CLI patterns (echo, wc, read/write) and example project structure.

Constraints to document

  • WASIp1 path resolution uses longest-prefix matching against preopen names. No cwd. No fallback.
  • Absolute paths only work if a preopen named / (or starting with /) exists.
  • Stdio is unified: @wasi/stdio values implement both sync and async reader/writer traits.

Minimal workflow

  1. Start from an assets/ example in mbt-wasip1-tools.
  2. Keep logic simple and deterministic; only I/O is async.
  3. Document the required wasmtime run --dir host::guest usage and expected preopens.
  4. Add a README to each example with build/run commands.
  5. Package the skill using the skill-creator guidelines when done.