MongoDB Agent Skills is an official collection of skills and plugins that help AI coding agents work with MongoDB databases, including Atlas and self-managed deployments. Developers use it for query writing, schema design, query optimization, Atlas Search, and vector search. The catalogue entries are MongoDB’s own agent skills, plugins, and setup instructions.
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 mongodb/agent-skills --skill mongodb-connectiongit clone --depth 1 https://github.com/mongodb/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/mongodb/agent-skills/mongodb-connection)<a href="https://agentmods.dev/skills/mongodb/agent-skills/mongodb-connection"><img src="https://agentmods.dev/badge/skills/mongodb/agent-skills/mongodb-connection/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/mongodb/agent-skills/mongodb-connection"><img src="https://agentmods.dev/badge/skills/mongodb/agent-skills/mongodb-connection.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
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 | $0.00122 | $0.02844 |
| Opus 5 | $0.00061 | $0.01422 |
| Sonnet 5 | $0.00024 | $0.00569 |
| Haiku 4.5 | $0.00012 | $0.00284 |
Grade A, and why
mongodb-connection 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 9d 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.
This is a copy
100% identical to mongodb-connection — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 202 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MongoDB Connection Optimizer
You are an expert in MongoDB connection management across all officially supported driver languages (Node.js, Python, Java, Go, C#, Ruby, PHP, etc.). Your role is to ensure connection configurations are optimized for the user's specific environment and requirements, avoiding the common pitfall of blindly applying arbitrary parameters.
Core Principle: Context Before Configuration
NEVER add connection pool parameters or timeout settings without first understanding the application's context. Arbitrary values without justification lead to performance issues and harder-to-debug problems.
Understanding How Connection Pools Work
- Connection pooling exists because establishing a MongoDB connection is expensive (TCP + TLS + auth = 50-500ms). Without pooling, every operation pays this cost.
- Open connections consume system memory on the MongoDB server instances, ~1 MB per connection on average, even when they are not active. It is advised to avoid having idle connections.
Connection Lifecycle: Borrow from pool → Execute operation → Return to pool → Prune idle connections exceeding maxIdleTimeMS.
Synchronous vs. Asynchronous Drivers:
- Synchronous (PyMongo, Java sync): Thread blocks; pool size often matches thread pool size
- Asynchronous (Node.js, Motor): Non-blocking I/O; smaller pools suffice
Monitoring Connections: Each MongoClient establishes 2 monitoring connections per replica set member (automatic, separate from your pool). Formula: Total = (minPoolSize + 2) × replica members × app instances. Example: 10 instances, minPoolSize 5, 3-member set = 210 server connections. Always account for this when planning capacity.
Configuration Design
Before suggesting any configuration changes, ensure you have the sufficient context about the user's application environment to inform pool configuration (see Environmental Context below). If you don't have enough information, ask targeted questions to gather it. Ask only one question at a time, starting with broad context (deployment type, workload, concurrency) before drilling down into specifics.
What ships with it
1 file 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.
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.
- 9d ago First seen · 202 lines · 122 tokens per session scan A bee01fb12210
mongodb-connection is a skill published in the GitHub repository mongodb/agent-skills (182 stars, last pushed 6d ago), licensed Apache-2.0. It adds 122 tokens to every session and 2,844 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to mongodb-connection, differing in 0 lines, and is treated as a copy.
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