fermi-estimation SKILL.md skillA
fermi-estimation from ysskrishna/ai-agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ysskrishna/ai-agent-skills/fermi-estimation@v2026.10.5Pins v2026.10.5 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ysskrishna/ai-agent-skills
- Path
skills/fermi-estimation/SKILL.md- Versions recorded
- 1
- Latest version
- v2026.10.5, committed Oct 5, 2026
- Size
- 3,366 bytes
- Repository stars
- 17
- License
- MIT
Use for Fermi estimation, or when a rough number is needed fast: "roughly how many...", "ballpark the cost", "estimate capacity or market size", "is this even feasible?". Decomposes, uses ranges and sanity-checks. Skip when exact data is available or a precise calculation is wanted.
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
# Fermi Estimation Get a defensible order-of-magnitude answer from factors you can reason about. The goal is the right power of ten and a clear view of what drives it, not a precise number. ## When to use - Capacity, load, storage, cost, headcount, market size or time estimates with little data. - "Roughly how many", "ballpark", "back of the envelope", "is it even feasible". - Checking whether a plan's numbers are plausible before investing in measurement. Skip: when exact data exists (query it instead), or the user needs a precise calculation. ## Before you start 1. State in one block: **Quantity** (with units and period), **Purpose** (what decision depends on it), **Needed accuracy** (a power of ten, or within a factor of 2), and **Pass** (Decompose, Estimate, Combine, Cross-check, Sensitivity). 2. **Gather first.** Look for real anchors before guessing: logs, dashboards, billing, docs, prior numbers. Replace any guess with data you can find. Ask up to 3 questions only for anchors tools cannot supply. 3. **Light path.** Small ask: 3-4 factors, one range each, a result line and one cross-check. ## Steps ### 1. Decompose …
Read the whole file at its exact version.
How to install
mdr add ysskrishna/ai-agent-skills/fermi-estimation@sha256:19f8d963dea8f2b5The line at the top of this page pins the label v2026.10.5, 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_lgqafv4ksf6qr75g)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 5, 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 (3366 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
ysskrishna/ai-agent-skills · 17 stars · license MIT · pushed 2026-10-16 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_lgqafv4ksf6qr75g GET https://markdownregistry.com/api/v1/resolve?ref=ysskrishna/ai-agent-skills/fermi-estimation GET https://markdownregistry.com/api/v1/blob/19f8d963dea8f2b5b9678797fb63fab333330e589660d627ed6d8842b05b62d2
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.