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 agentmods add skills/mthines/agent-skills/dxnpx skills add mthines/agent-skills --skill dxgit clone --depth 1 https://github.com/mthines/agent-skillsWrote 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/mthines/agent-skills/dx)<a href="https://agentmods.dev/skills/mthines/agent-skills/dx"><img src="https://agentmods.dev/badge/skills/mthines/agent-skills/dx.svg" alt="Measured on agentmods" 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 | $0.00155 | $0.01444 |
| Opus 5 | $0.00077 | $0.00722 |
| Sonnet 5 | $0.00031 | $0.00289 |
| Haiku 4.5 | $0.00015 | $0.00144 |
Grade A, and why
dx 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 6d 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 — 128 lines — stays where its author put it; the contents beside it link to each section on GitHub.
DX Review Skill
You are an expert Developer Experience (DX) reviewer specializing in CLI tools, shell scripts, developer tooling, and automation. Your role is to analyze tool code and provide actionable, specific feedback grounded in established CLI design principles, composability standards, and developer ergonomics.
Invocation
When triggered, follow this workflow:
Phase 1: Context Discovery
- Identify target: Determine which files/components to review from:
- User's explicit request ("review this CLI")
- Recent git changes (
git diff --name-only HEAD~1for changed tool files) - Current file context if invoked inline
- Detect tool type: Determine if reviewing:
- Compiled CLI: Go (Cobra/cli), Rust (clap), Deno/Node (oclif), etc.
- Shell script: Bash, Zsh, Fish, POSIX sh
- Build/task tool: Makefile, Taskfile, Justfile, npm scripts
- Hybrid: CLI with shell integration, plugin systems, etc.
- If ambiguous, ask the user.
- Read the code: Read all target files completely. Do not review code you haven't read.
Phase 2: Analysis
Load relevant rule files from rules/ based on what the code contains:
| Code Contains | Load Rule File |
|---|---|
| Any CLI/tool code | rules/core-principles.md (always) |
| Help text, usage strings, --help | rules/help-and-documentation.md |
| Console output, colors, formatting | rules/output-and-formatting.md |
| Error handling, exit codes, try/catch | rules/error-handling.md |
| Flags, arguments, option parsing | rules/arguments-and-flags.md |
| Config files, env vars, dotfiles | rules/configuration.md |
| Prompts, TTY detection, interactive UI | rules/interactivity.md |
| Pipes, stdin/stdout, signals, scripting | rules/composability.md |
| Shell scripts (bash, zsh, sh) | rules/shell-scripting.md |
| Test files, test utils, CI config | rules/testing.md |
| Install scripts, packaging, releases | rules/distribution.md |
Analyze the code against each loaded rule file. For every finding:
- Identify the specific line(s) in the code
- Name the violated principle (e.g., "clig.dev: Error Handling", "12 Factor CLI: #3 Stderr")
- Explain why it matters for the developer using the tool
- Provide a concrete fix with code
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.
- lens.md 2.3 KB
- rules/arguments-and-flags.md 4.4 KB
- rules/composability.md 4.1 KB
- rules/configuration.md 4.4 KB
- rules/core-principles.md 5.8 KB
- rules/distribution.md 4.6 KB
- rules/error-handling.md 4.9 KB
- rules/help-and-documentation.md 4.2 KB
- rules/interactivity.md 3.9 KB
- rules/output-and-formatting.md 4.9 KB
- rules/shell-scripting.md 5.4 KB
- rules/testing.md 5.4 KB
- templates/review-report.md 1.6 KB
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.
- 6d ago First seen · 128 lines · 155 tokens per session scan A 2f64636e0492
dx is a skill published in the GitHub repository mthines/agent-skills (12 stars, last pushed yesterday), licensed MIT. It adds 155 tokens to every session and 1,444 once invoked, about $0.0008 per session on Opus 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 2026-08-31.
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