system-design-estimation skillA
system-design-estimation is agent-read markdown (skill) from hoangnguyen0403/agent-skills-standard: Compute defensible capacity numbers before architecture: average and peak QPS, storage growth, bandwidth, working-set memory, latency and availability budgets. Use when sizing a service, provisioning infrastructure, or checking that a design survives peak load..
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What the file says
# Capacity Estimation ## **Priority: P1 (HIGH)** Estimate before you architect. One order of magnitude decides cache, shard, and queue choices. ## Core Formulas - `average QPS = DAU x actions per user per day / 86,400` - `peak QPS = average QPS x peak factor` (default 5x; 20-100x for flash sale, ticket drop, or scheduled push) - `storage per year = writes per day x record size x 365 x replication factor` - `bandwidth = QPS x payload size` (compute ingress and egress separately) - `working set = hot records x record size`, where hot is typically 20% of data serving 80% of reads - `connections = concurrent users x connections per user`; compare against pool and file-descriptor limits ## Method 1. Round every input to one significant figure. Precision here is false precision. 2. Compute average, then peak, then storage, then bandwidth, then memory. 3. Compare each result to a known ceiling from [estimation numbers](references/estimation-numbers.md): single-node QPS, disk IOPS, NIC throughput, RAM per instance. 4. Name the **shaping quantity** - the first number that breaks a single-node ceiling. It dictates the first component added in high-level design. …
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How to install
mdr add hoangnguyen0403/agent-skills-standard/system-design-estimation@git:20260830.00e03f4mdr add hoangnguyen0403/agent-skills-standard/system-design-estimation@sha256:9fccdf2f44004b0bPin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_jst2qpvod5txpq26)
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Source
hoangnguyen0403/agent-skills-standard · 571 stars · license MIT · pushed 2026-09-24 · branch develop
API
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