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 rossumai/claude-marketplace --skill mongodb-referencegit clone --depth 1 https://github.com/rossumai/claude-marketplaceWrote 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/rossumai/claude-marketplace/mongodb-reference)<a href="https://agentmods.dev/skills/rossumai/claude-marketplace/mongodb-reference"><img src="https://agentmods.dev/badge/skills/rossumai/claude-marketplace/mongodb-reference/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/rossumai/claude-marketplace/mongodb-reference"><img src="https://agentmods.dev/badge/skills/rossumai/claude-marketplace/mongodb-reference.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00090 | $0.00350 |
| Opus 5.5 | $0.00036 | $0.00140 |
| Sonnet 5.5 | $0.00018 | $0.00070 |
| Haiku 4.5 | $0.00009 | $0.00035 |
Grade A, and why
mongodb-reference 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 2mo 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.
What it actually says
MongoDB Query Reference
This skill provides a comprehensive MongoDB query language reference for use across Rossum — in Master Data Hub matching configurations, Data Storage API calls, or any context that uses MongoDB-style queries. For complete details, see reference.md.
Use this knowledge when:
- Writing MongoDB find queries or aggregation pipelines
- Using
$searchwith fuzzy matching, compound queries, or score filtering - Using
$lookup,$unionWith,$function, or other advanced pipeline features - Building regex patterns for data matching
- Understanding MongoDB operators (comparison, logical, element, array, evaluation)
- Working with Atlas Search (dynamic thresholds, embedded document search)
- Debugging query syntax, performance, or unexpected results
- Handling data type coercion in queries
When writing or debugging queries, if the dataset structure is not already known from context, try to discover it using the rossum-api MCP tools: data_storage_list_collections to find available collections and data_storage_aggregate with [{"$sample": {"size": 1}}] to retrieve a sample record. Fall back to asking the user only if the MCP tools are not available.
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.
- 2mo ago First seen · 22 lines · 90 tokens per session scan A 581af572085f
mongodb-reference is a skill published in the GitHub repository rossumai/claude-marketplace (5 stars, last pushed 5d ago), licensed MIT. It adds 90 tokens to every session and 350 once invoked, about $0.0004 per session on Opus 5.5. 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.
mongodb-reference compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mongodb-referencerossumai/claude-marketplace | Skill | 5 | 5d ago | MIT | A | 90 | Claude Code |
| dbxt8y2/dbx | Skill | 30k | today | Apache-2.0 | A | 74 | Claude Code, Codex |
| azure-mgmt-mongodbatlas-dotnetmicrosoft/skills | Skill | 3.2k | yesterday | MIT | A | 64 | Claude Code |
| nosqliPurpleAILAB/Decepticon | Skill | 6.6k | 4d ago | Apache-2.0 | A | 38 | Claude Code, Codex |
| prisma-mongodb-upgradenitrocloudofficial/nitrostack | Skill | 2.6k | 2d ago | Apache-2.0 | A | 95 | Claude Code, Codex |
| byted-volcengine-mongodbbytedance/agentkit-samples | Skill | 485 | 5d ago | Apache-2.0 | A | 82 | Claude Code, Codex |
| commerce-app-storageadobe/skills | Skill | 325 | today | Apache-2.0 | A | 78 | Claude Code |