capacity-estimation SKILL.md skillA
capacity-estimation from aethrox/doctrine is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add aethrox/doctrine/capacity-estimation@git:20260910.79ff911Pins git:20260910.79ff911 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- aethrox/doctrine
- Path
skills/capacity-estimation/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260910.79ff911, committed Sep 10, 2026
- Size
- 10,409 bytes
- Repository stars
- 19
- License
- MIT
Turn a vague performance requirement into arithmetic before the architecture is chosen, size concurrency with Little's Law, and label every input as measured, derived, or assumed. Use when a design calls itself "scalable" or "fast" without a number, when choosing between one machine and a distributed system, when sizing a thread pool, connection pool, queue, or instance count, or when someone asks how much traffic, storage, or bandwidth a system will need.
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
# Capacity Estimation A design chosen before anyone did the arithmetic was chosen on taste. This skill's defining constraint, from Little's Law (J.D.C. Little, "A Proof for the Queuing Formula: L = λW", *Operations Research* 9(3), 1961, pp. 383-387): the average number of requests in a system equals the arrival rate multiplied by the time each request spends there, and that relationship holds without assuming anything about queue discipline or service-time distribution. Required concurrency is therefore not a matter of opinion, it is a multiplication, and a system whose load has never been multiplied out cannot honestly claim it needs to be distributed. This is a before-the-system-exists job, distinct from the doctrine skills it would otherwise overlap: - `observability` measures a system that is already running: golden signals, SLI, SLO, error budget. This skill produces the target numbers that a later SLO gets set against. If the service is live and the question is "how is it doing," that is `observability`, not this. …
Read the whole file at its exact version.
How to install
mdr add aethrox/doctrine/capacity-estimation@sha256:b66c7afbccd03065The line at the top of this page pins the label git:20260910.79ff911, 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_iwbnnxosbfer2g2c)
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Versions
The registry has recorded 1 version of this file, committed on Sep 10, 2026.
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 (10409 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
aethrox/doctrine · 19 stars · license MIT · pushed 2026-09-11 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_iwbnnxosbfer2g2c GET https://markdownregistry.com/api/v1/resolve?ref=aethrox/doctrine/capacity-estimation GET https://markdownregistry.com/api/v1/blob/b66c7afbccd0306523c812a893d71e232879264e49d3301c6ea0a5705a6d7619
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.