vinta/best-practices
Use when the user asks about best practices, gotchas, common pitfalls, or recommended patterns for tools, libraries, config formats, API patterns, or project setup, or when setting up, configuring, choosing, or refining these where outdated guidance causes debugging pain. Also use when the user says "search online", "how should I", or "what's the best way to
npx skills add https://github.com/vinta/hal-9000 --skill best-practices
Answer two questions from current sources: what's the recommended way, and what bites people (the gotchas and pitfalls around it). A how-to without its pitfalls is half an answer.
The user's argument may be a question or an imperative. Imperatives ("refine X", "set up Y") determine what Phase 2 does, not whether Phase 1 happens. Phase 1 always runs.
Rationalizations that precede skipped research:
| Thought | Reality |
| ------------------------- | -------------------------------------------------------------------------------------- |
| "I already know this" | Training data goes stale. Config keys get renamed, APIs get deprecated. |
| "The user said to act" | The imperative scopes Phase 2, it does not eliminate Phase 1. |
| "This is a simple lookup" | A 30-second search costs nothing. A wrong recommendation costs a debugging round-trip. |
Break the topic into 2-4 specific queries. Dedicate at least one query to pitfalls ("common mistakes with X", "X gotchas in production"): pitfalls live in issue threads, migration guides, and post-mortems, not in getting-started docs, so a how-to query won't surface them. For single-library lookups, call find-docs or WebSearch directly without subagents.
Dispatch one subagent per query in a single message so they run in parallel, passing model: sonnet on each Agent call so the bulk research stays cheap while orchestration and synthesis keep the session model. Each uses find-docs (Context7) and WebSearch. Be concrete in each subagent prompt: pass library names, version constraints, and the user's specific context. Vague prompts produce vague results.
<subagent_prompt_template>
<context>
The user wants to [user's task]. We need the latest, authoritative guidance on [specific aspect].
</context>
<task>
Research best practices for: [specific query]
Use the find-docs skill to look up [library/tool] documentation, then use WebSearch to find recent guides and recommendations for "[specific search query]".
</task>
<output_format>
Report:
Keep it under 400 words. If space runs short, compress the explanations rather than dropping pitfalls. If you cannot find authoritative guidance on a point, say so explicitly rather than guessing.
</output_format>
</subagent_prompt_template>
After all subagents return, merge using these criteria:
If a subagent failed or returned empty, note the gap and proceed with the results you have. Do not block synthesis waiting for a straggler.
Deliver to the user in this structure:
find-docs fails with quota errors, fall back to WebSearch only and note the limitation.find-docs and WebSearch fail, say so explicitly rather than falling back to training data.Take vinta/best-practices from the repository into ~/.claude/skills for personal
use, or into .claude/skills inside a project.
The agent identifies a skill by the name field in its header. Two skills with the
same name cannot sit side by side — one of them will be ignored.
The instructions reference npx.
Without those the skill loads but fails at the first command.