Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add wyattowalsh/agents --skill shell-conventionsgit clone --depth 1 https://github.com/wyattowalsh/agentsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/wyattowalsh/agents/shell-conventions)<a href="https://agentmods.dev/skills/wyattowalsh/agents/shell-conventions"><img src="https://agentmods.dev/badge/skills/wyattowalsh/agents/shell-conventions/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/wyattowalsh/agents/shell-conventions"><img src="https://agentmods.dev/badge/skills/wyattowalsh/agents/shell-conventions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00043 | $0.01595 |
| Opus 5.5 | $0.00017 | $0.00638 |
| Sonnet 5.5 | $0.00009 | $0.00319 |
| Haiku 4.5 | $0.00004 | $0.00160 |
Grade A, and why
shell-conventions scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Shell Conventions
Apply these conventions whenever shell work is the primary task.
Scope: Shell scripts, shell snippets, Makefile, and justfile convention
enforcement. NOT for script generation, major shell refactors, Python, or CI
workflow YAML.
Dispatch
| $ARGUMENTS | Action |
|---|---|
Active (auto-invoked when editing .sh, .bash, .zsh, Makefile, or justfile) |
Apply the active operator contract below |
| Empty | Display the mode summary and trigger boundaries |
check |
Verify conventions only |
When to Use
- Editing an existing shell script, shell snippet,
Makefile, orjustfile - Normalizing portability, quoting, shebangs, env usage, or task naming
- Reviewing shell changes for baseline safety and repo shell habits
- Checking whether shell code follows the repo's required conventions
Canonical Vocabulary
| Canonical Term | Meaning |
|---|---|
| shell-primary | The main task is editing or reviewing shell, Make, or just code rather than touching it incidentally |
| conventions-only | Verify or tighten style, portability, and safety without redesigning the automation |
| env-based shebang | A shebang that resolves the interpreter through the environment rather than a hardcoded path |
| incidental shell | Shell appears only as a small supporting detail inside a larger non-shell task |
| target hygiene | Clear task names, predictable behavior, and explicit treatment of destructive operations |
Operator Contract
Active Auto-Invoke
- Confirm shell work is primary, not incidental to a broader task.
- Apply shell-specific conventions to the file being edited.
- Read
references/script-baseline.mdfor shell scripts and snippets. - Read
references/make-just.mdforMakefileorjustfilework. - Read
references/redirection-boundaries.mdif the task mixes shell with CI, deployment, or code generation concerns. - Keep the work limited to convention enforcement; do not broaden into script design or automation architecture.
What ships with it
13 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- evals/evals.json 3.6 KB
- references/check-mode.md 1.8 KB
- references/make-just.md 1.9 KB
- references/redirection-boundaries.md 1.9 KB
- references/script-baseline.md 2.0 KB
- scripts/asset_toolkit/__init__.py 303 B runs code
- scripts/asset_toolkit/_shared.py 5.6 KB runs code
- scripts/asset_toolkit/common.py 3.0 KB runs code
- scripts/asset_toolkit/package.py 43 KB runs code
- scripts/asset_toolkit/validate_evals.py 11 KB runs code
- scripts/asset_toolkit/validate_hooks.py 13 KB runs code
- scripts/asset_toolkit/validate_skill.py 3.6 KB runs code
- scripts/check.py 2.2 KB runs code
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 143 lines · 43 tokens per session scan A e7a82fee5da7
shell-conventions is a skill published in the GitHub repository wyattowalsh/agents (5 stars, last pushed 1mo ago), licensed MIT. It adds 43 tokens to every session and 1,595 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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