Agent skill
portable-safe-skills
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 this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/portable-safe-skills
SKILL.md
Portable and Safe Skills
Use skill-creator
- Follow the
skill-creatorworkflow for skill structure, naming, and packaging. - Keep SKILL.md short and move detailed content to
references/orassets/.
Required dependency
- Use
mbt-wasip1-toolsfor 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/stdiovalues implement both sync and async reader/writer traits.
Minimal workflow
- Start from an
assets/example inmbt-wasip1-tools. - Keep logic simple and deterministic; only I/O is async.
- Document the required
wasmtime run --dir host::guestusage and expected preopens. - Add a README to each example with build/run commands.
- Package the skill using the
skill-creatorguidelines when done.
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