Database Mongodb Skill for Cursor

Apply MongoDB data-modeling, indexing, and query rules from access patterns. Use when designing schemas, choosing embed vs reference, or tuning MongoDB query behavior.

4k tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

536

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/HoangNguyen0403/agent-skills-standard --skill database-mongodb

What comes with it

13 301 bytes besides the instruction

evals/evals.json

references/anti-patterns.md

references/best-practices.md

references/checklist.md

references/implementation.md

references/postgres-comparison.md

The instruction itself

6 sections, as written by the author

MongoDB Best Practices

Priority: P0 (CRITICAL)

Rules

Model from access patterns: data read together should usually live together.
Embed for bounded one-to-few data; reference for unbounded growth or independent lifecycle.
Build indexes for real queries, not theoretical flexibility. Use ESR ordering for equality -> sort -> range compound indexes.
Use transactions only when single-document guarantees are insufficient.

Verify

[ ] Embed vs reference choice matches cardinality and lifecycle.
[ ] Compound index order matches equality -> sort -> range access.
[ ] Large pagination uses cursor patterns, not deep skip().
[ ] Explain output supports the chosen indexes; review keysExamined and docsExamined.
[ ] Unbounded arrays and hot shard keys were reviewed.

Anti-Patterns

No unbounded arrays: Use $push with $slice or redesign using Bucket Pattern.
No client-side filtering: Project only needed fields; never fetch full docs to filter in memory.
No deep nesting: Keep nesting ≤4 levels; flatten paths that frequently queried.
No index cargo cult: each index must map to a read path and write tradeoff.

References

Framework Map
Best Practices Guide
Anti-Patterns
Postgres vs Mongo Comparison

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13k tokens scripts

How to use it

Copy the folder

Take hoangnguyen0403/database-mongodb from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

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.