mongodb SKILL.md skillA
mongodb from ericrisco/rsc-harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ericrisco/rsc-harness/mongodb@git:20260729.111532cPins git:20260729.111532c in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ericrisco/rsc-harness
- Path
skills/mongodb/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260729.111532c, committed Jul 29, 2026
- First version recorded
- Jun 2, 2026
- Size
- 19,345 bytes
- Repository stars
- 236
- License
- MIT
Use when modeling MongoDB documents (embed versus reference, the 16MB cap, bucket and subset patterns), choosing or fixing indexes (compound order by the ESR rule, partial, TTL, multikey, reading explain), writing aggregation pipelines that stay index-eligible, running multi-document transactions with retry, or operating and securing a deployment (replica set, read/write concern, Atlas tiers, Vector Search, Queryable Encryption). MongoDB 8.2, driver-agnostic. NOT relational schema, SQL or…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# MongoDB — modeling, indexing, aggregation, transactions, ops
Engine-level MongoDB 8.2 guidance: model documents for the queries you actually run, pick the
index the planner will use, write aggregation pipelines that stay index-eligible, run
multi-document transactions with correct retry, and operate/secure a deployment. Driver-agnostic —
every example is `mongosh` shell syntax that maps 1:1 to the official drivers (Node, Python, Go,
Java, Rust). This skill owns the **server's query and the index it picks**, not any ODM's API.
## When to use / When NOT to use
**When to use:**
- Document modeling: embed vs reference, the 16 MB cap, one-to-many/many-to-many, the
subset/extended-reference/bucket/computed/outlier patterns, taming unbounded array growth.
- Index decisions: single-field, compound (the ESR ordering rule), multikey, partial, TTL, text,
wildcard, `2dsphere`; and when an index is NOT worth it.
- Any query that is slow or scans too much; reading `explain("executionStats")`.
- Aggregation pipelines: stage order so `$match`/`$sort` hit an index, `$lookup` cost, `$unwind`
explosion, `$group`/`$sort` memory limits and `allowDiskUse`, `$merge`/`$out`, faceting.
…Read the whole file at its exact version.
How to install
mdr add ericrisco/rsc-harness/mongodb@sha256:bf13001664bdf1aeThe line at the top of this page pins the label git:20260729.111532c, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_jeovnh3duvcvnerg)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jun 2, 2026 and Jul 29, 2026, about one every 29 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260729.111532c latest | 2026-07-29 | 111532c | 19,345 B | A | view · diff |
| git:20260615.5ea6bc3 | 2026-06-15 | 5ea6bc3 | 19,643 B | A | view · diff |
| git:20260602.a962997 | 2026-06-02 | a962997 | 19,617 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (19345 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
ericrisco/rsc-harness · 236 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_jeovnh3duvcvnerg GET https://markdownregistry.com/api/v1/resolve?ref=ericrisco/rsc-harness/mongodb GET https://markdownregistry.com/api/v1/blob/bf13001664bdf1ae09af628dade6fea2f2776a021ddb907d00be178ac9f1581d
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from ericrisco/rsc-harness
Every file in ericrisco/rsc-harness