Database Fundamentals
DanielPodolsky/ownyourcode
Reviews schema design, SQL queries, ORM patterns. An agent skill from DanielPodolsky/ownyourcode.
MongoDB operations expert for queries, aggregation pipelines, indexes, and schema design
Install Mongodb
$ npx skills add RightNow-AI/openfang --skill mongodb -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install RightNow-AI/openfang mongodb --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .claude/skills && cp -r skills-src/crates/openfang-skills/bundled/mongodb .claude/skills/mongodb && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "mongodb" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/mongodb into .claude/skills/mongodb/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mongodb", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/mongodbType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add RightNow-AI/openfang --skill mongodb -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install RightNow-AI/openfang mongodb --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .agents/skills && cp -r skills-src/crates/openfang-skills/bundled/mongodb .agents/skills/mongodb && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "mongodb" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/mongodb into .agents/skills/mongodb/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mongodb", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add RightNow-AI/openfang --skill mongodb -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install RightNow-AI/openfang mongodb --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/crates/openfang-skills/bundled/mongodb .cursor/skills/mongodb && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "mongodb" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/mongodb into .cursor/skills/mongodb/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mongodb", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/RightNow-AI/openfang.git --path crates/openfang-skills/bundled/mongodb--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add RightNow-AI/openfang --skill mongodb -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install RightNow-AI/openfang mongodb --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/crates/openfang-skills/bundled/mongodb .gemini/skills/mongodb && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "mongodb" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/mongodb into .gemini/skills/mongodb/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mongodb", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install RightNow-AI/openfang mongodbInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add RightNow-AI/openfang --skill mongodb -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .github/skills && cp -r skills-src/crates/openfang-skills/bundled/mongodb .github/skills/mongodb && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "mongodb" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/mongodb into .github/skills/mongodb/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mongodb", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add RightNow-AI/openfang --skill mongodb -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install RightNow-AI/openfang mongodb --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/RightNow-AI/openfang.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/crates/openfang-skills/bundled/mongodb .opencode/skills/mongodb && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "mongodb" agent skill from https://github.com/RightNow-AI/openfang/tree/main/crates/openfang-skills/bundled/mongodb into .opencode/skills/mongodb/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mongodb", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
mongodb- GitHub stars
- 18k
- Token cost
- ~821 tokens
- SKILL.md length
- 425 words
- Files
- 1
- Skills in repo
- 68
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
MongoDB operations expert for queries, aggregation pipelines, indexes, and schema design
- Tasks that involve NoSQL databases
- SKILL.md covers Key Principles, Schema Design, Query Patterns and Aggregation Framework, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Tasks that involve Database schema design
What it does
Mongodb is an agent skill from RightNow-AI/openfang. MongoDB operations expert for queries, aggregation pipelines, indexes, and schema design
Its SKILL.md is about 820 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Databases, covering NoSQL databases and Database schema design. It works with MongoDB. The repository describes itself as: Open-source Agent Operating System. The licence is Apache-2.0.
When your agent uses it
- Tasks that involve NoSQL databases
- Tasks that involve Database schema design
Example prompts
- “/mongodb”
What it can do on your machine
Read from SKILL.md and the folder at commit acf2587. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Mongodb loads about 821 tokens when it runs. Until then it costs about 24 tokens; SKILL.md has 425 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from RightNow-AI/openfang at commit acf2587, republished under its Apache-2.0 licence (© RightNow-AI). 425 words, ~821 tokens.
Download SKILL.mdSave it as
.claude/skills/mongodb/SKILL.md (or your agent's skills folder).- name
- mongodb
- description
- MongoDB operations expert for queries, aggregation pipelines, indexes, and schema design
MongoDB Operations Expert
You are a MongoDB specialist. You help users design schemas, write queries, build aggregation pipelines, optimize performance with indexes, and manage MongoDB deployments.
Key Principles
- Design schemas based on access patterns, not relational normalization. Embed data that is read together; reference data that changes independently.
- Always create indexes to support your query patterns. Every query that runs in production should use an index.
- Use the aggregation framework instead of client-side data processing for complex transformations.
- Use
explain("executionStats")to verify query performance before deploying to production.
Schema Design
- Embed when: data is read together, the embedded array is bounded, and updates are infrequent.
- Reference when: data is shared across documents, the related collection is large, or you need independent updates.
- Use the Subset Pattern: store frequently accessed fields in the main document, move rarely-used details to a separate collection.
- Use the Bucket Pattern for time-series data: group events into time-bucketed documents to reduce document count.
- Include a
schemaVersionfield to support future migrations.
Query Patterns
- Use projections (
{ field: 1 }) to return only needed fields — reduces network transfer and memory usage. - Use
$elemMatchfor querying and projecting specific array elements. - Use
$infor matching against a list of values. Use$existsand$typefor schema variations. - Use
$textindexes for full-text search or Atlas Search for advanced search capabilities. - Avoid
$whereand JavaScript-based operators — they are slow and cannot use indexes.
Show full SKILL.md (193 more words)Show less
Aggregation Framework
- Build pipelines in stages:
$match(filter early),$project(shape),$group(aggregate),$sort,$limit. - Always place
$matchas early as possible in the pipeline to reduce the working set. - Use
$lookupfor left outer joins between collections, but prefer embedding for frequently joined data. - Use
$facetfor running multiple aggregation pipelines in parallel on the same input. - Use
$mergeor$outto write aggregation results to a collection for materialized views.
Index Optimization
- Create compound indexes following the ESR rule: Equality fields first, Sort fields second, Range fields last.
- Use
db.collection.getIndexes()anddb.collection.aggregate([{$indexStats:{}}])to audit index usage. - Use partial indexes (
partialFilterExpression) to index only documents that match a condition — reduces index size. - Use TTL indexes for automatic document expiration (sessions, logs, temporary data).
- Drop unused indexes — they consume memory and slow writes.
Pitfalls to Avoid
- Do not embed unbounded arrays — documents have a 16MB size limit and large arrays degrade performance.
- Do not perform unindexed queries on large collections — they cause full collection scans (COLLSCAN).
- Do not use
$regexwith a leading wildcard (/.*pattern/) — it cannot use indexes. - Avoid frequent updates to heavily indexed fields — each update must modify all affected indexes.
© RightNow-AI, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in crates/openfang-skills/bundled/mongodb of RightNow-AI/openfang.
Open the folder on GitHubat commit acf2587
Compare with similar skills
Mongodb next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Mongodb this skillRightNow-AI/openfang | 18k | — | ~821 | Automated safety check: Pass | Apache-2.0 | |
| Database FundamentalsDanielPodolsky/ownyourcode | 290 | 1 repos | ~1.6k | Automated safety check: Pass | MIT | |
| Database Expertcin12211/orca-q | 224 | — | ~2.8k | Automated safety check: Pass | MIT | |
| Mongodb Schema Designmongodb/agent-skills | 190 | 2 repos | ~3.4k | Automated safety check: Pass | Apache-2.0 | |
| DB SculptorEliasOulkadi/shokunin | 114 | — | ~3.1k | Automated safety check: Notes | MIT | |
| Database Domain Specialistmodu-ai/moai-adk | 1.2k | — | ~2.8k | Automated safety check: Pass | Apache-2.0 |
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Related
Works with
Categories
Questions about Mongodb
What does Mongodb do?
MongoDB operations expert for queries, aggregation pipelines, indexes, and schema design. Mongodb is an agent skill from RightNow-AI/openfang.
When should I use Mongodb?
Mongodb fits situations like: tasks that involve NoSQL databases; tasks that involve Database schema design.
How do I install Mongodb in Claude Code?
Run `npx skills add RightNow-AI/openfang --skill mongodb -a claude-code`. Or copy the skill folder (crates/openfang-skills/bundled/mongodb in RightNow-AI/openfang) into .claude/skills/mongodb in your project. Claude Code loads it when a task matches its description.
How do I install Mongodb in Codex?
Run `npx skills add RightNow-AI/openfang --skill mongodb -a codex`. Or copy the skill folder (crates/openfang-skills/bundled/mongodb in RightNow-AI/openfang) into .agents/skills/mongodb in your project. Codex loads it when a task matches its description.
Can I use Mongodb in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add RightNow-AI/openfang --skill mongodb -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mongodb, .gemini/skills/mongodb, .github/skills/mongodb and .opencode/skills/mongodb in your project.
What does Mongodb need to run?
SKILL.md names no scripts, command-line tools or credentials: Mongodb is instructions for the agent only.
Does Mongodb access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Mongodb safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Mongodb use?
Mongodb is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Mongodb use?
About 821 tokens (SKILL.md is roughly 3.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Mongodb?
Skills that share tags, products or a category with Mongodb: Database Fundamentals (DanielPodolsky/ownyourcode, 290 stars), Database Expert (cin12211/orca-q, 224 stars), Mongodb Schema Design (mongodb/agent-skills, 190 stars) and DB Sculptor (EliasOulkadi/shokunin, 114 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Mongodb?
RightNow-AI (a GitHub organization) maintains it in RightNow-AI/openfang, which has 18,216 GitHub stars. The repository holds 68 skills in this directory. The repository was last updated on July 2, 2026.
Source: RightNow-AI/openfang on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.