documentdb-storage

Storage-sizing guidance for Azure DocumentDB clusters using Premium SSD or Premium SSD v2 disks. It explains how disk capacity, compute tier, IOPS, bandwidth, encryption-key support, and migration limits affect the choice.

In plain words
What is it for?
Use it when choosing a disk type, sizing capacity and compute separately, checking performance limits, planning encryption requirements, or changing storage on an existing cluster.
Why use it?
It prevents sizing storage by the wrong measure, such as buying a larger disk only to obtain more I/O performance.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/azure/documentdb-agent-kit/storage
Any agent
npx skills add Azure/documentdb-agent-kit --skill storage
Clone the repo
git clone --depth 1 https://github.com/Azure/documentdb-agent-kit

Made for: Claude Code, Codex.

Per session 109 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 670 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00109 $0.00670
Opus 5 $0.00055 $0.00335
Sonnet 5 $0.00022 $0.00134
Haiku 4.5 $0.00011 $0.00067

Measured 2d ago against content hash c292bc1d080e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

documentdb-storage 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 2d 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.

skills/storage/SKILL.md · 36 lines

How it starts

The opening of the file, as written. The whole thing — 36 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Storage — Azure DocumentDB

Azure DocumentDB clusters use remote premium SSD storage. Two disk types are offered:

Storage type IOPS / bandwidth scaling Max IOPS CMK Use it for
Premium SSD (v1) Scales with disk capacity — bigger disk → higher IOPS 20,000 ✔️ Legacy clusters, scenarios that require CMK
Premium SSD v2 Decoupled from disk size — IOPS/bandwidth gated by compute tier 80,000 New production clusters; any I/O-intensive workload

Premium SSD v2 is the default recommendation for new clusters. It delivers up to a 12× performance boost at no added cost by removing the disk-size lever from the IOPS equation — you size storage for capacity and size compute for throughput, independently.

How Premium SSD v2 changes sizing

On Premium SSD v1, hitting 20,000 IOPS required provisioning a 20 TB disk even when only ~1 TB of data was stored. On Premium SSD v2, the highest achievable IOPS and bandwidth for the chosen compute tier are auto-configured regardless of disk size:

  • Choose storage size based on how much data the cluster will hold.
  • Choose compute tier based on how much IOPS / MBps the workload needs (see storage-tier-iops-caps).
  • No knobs to tune — the upper-bound IOPS/bandwidth for the tier are applied automatically at no extra cost.

Rules

Read the full file on GitHub · 36 lines

Files

What ships with it

4 files 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.

Changes

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.

  1. 2d ago First seen · 36 lines · 109 tokens per session scan A c292bc1d080e

Subscribe to this mod's changes

documentdb-storage is a skill published in the GitHub repository Azure/documentdb-agent-kit (5 stars, last pushed 1mo ago), licensed MIT. It adds 109 tokens to every session and 670 once invoked, about $0.0005 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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