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 estuary/agent-skills --skill capture-mongodb-creategit clone --depth 1 https://github.com/estuary/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/estuary/agent-skills/capture-mongodb-create)<a href="https://agentmods.dev/skills/estuary/agent-skills/capture-mongodb-create"><img src="https://agentmods.dev/badge/skills/estuary/agent-skills/capture-mongodb-create/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/estuary/agent-skills/capture-mongodb-create"><img src="https://agentmods.dev/badge/skills/estuary/agent-skills/capture-mongodb-create.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 | $0.00065 | $0.01963 |
| Opus 5 | $0.00032 | $0.00981 |
| Sonnet 5 | $0.00013 | $0.00393 |
| Haiku 4.5 | $0.00006 | $0.00196 |
Grade A, and why
capture-mongodb-create 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.
How it starts
The opening of the file, as written. The whole thing — 230 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create MongoDB Capture
Create a MongoDB capture using flowctl to stream data from MongoDB collections into Estuary collections using Change Data Capture (CDC).
Applies to: source-mongodb, source-amazon-documentdb, source-azure-cosmos-db
Step 0: Load Connector Documentation
Before proceeding, fetch the official connector docs for prerequisites, config reference, and deployment-specific setup.
Always load the main page: https://docs.estuary.dev/reference/Connectors/capture-connectors/MongoDB/
Then load the variant subpage based on the user's deployment:
| Deployment | Docs URL |
|---|---|
| MongoDB Atlas | Main page covers this |
| Self-hosted MongoDB | Main page covers this |
| Amazon DocumentDB | https://docs.estuary.dev/reference/Connectors/capture-connectors/MongoDB/amazon-documentdb/ |
| Azure Cosmos DB | https://docs.estuary.dev/reference/Connectors/capture-connectors/MongoDB/azure-cosmosdb/ |
Use WebFetch to load these pages. Together they cover:
- Prerequisites (replica set requirement, user permissions)
- Full config property reference
- Capture modes (Change Stream Incremental, Batch Snapshot, Batch Incremental)
- SSH tunnel configuration
- Network access / IP allowlisting
This skill provides the flowctl workflow and troubleshooting that docs don't cover.
Step 1: Gather Requirements
Before writing any YAML, ask the user:
- Deployment type? — MongoDB Atlas, self-hosted replica set, Amazon DocumentDB, or Azure Cosmos DB
- Network path? — Direct connection (Atlas/cloud with IP allowlist), SSH tunnel (private network), Private Link (AWS/Azure/GCP), or ngrok (local dev)
- Non-default data plane? — Most users use the default. Ask if they need a non-default data plane.
- Database and collections? — Which database, all collections or specific subset
- Capture mode? — Change Stream Incremental (default CDC), Batch Snapshot, or Batch Incremental
Critical check: MongoDB CDC requires a replica set. Atlas and DocumentDB always are. Self-hosted standalone will NOT work — must be converted to replica set first.
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 · 230 lines · 65 tokens per session scan A 36792e38eab0
capture-mongodb-create is a skill published in the GitHub repository estuary/agent-skills (7 stars, last pushed 18d ago), licensed Apache-2.0. It adds 65 tokens to every session and 1,963 once invoked, about $0.0003 per session on Opus 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.
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