tam-sam-som-calculator SKILL.md skillA
tam-sam-som-calculator from deanpeters/product-manager-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add deanpeters/product-manager-skills/tam-sam-som-calculator@git:20260810.b68bf96Pins git:20260810.b68bf96 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- deanpeters/product-manager-skills
- Path
skills/tam-sam-som-calculator/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260810.b68bf96, committed Aug 10, 2026
- First version recorded
- Feb 11, 2026
- Size
- 19,112 bytes
- Repository stars
- 7,599
- License
- a license file GitHub does not identify
Calculate TAM, SAM, and SOM with explicit assumptions, methods, and caveats. Use when sizing a market for a product idea, business case, or executive review.
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
## Purpose Guide product managers through calculating Total Addressable Market (TAM), Serviceable Available Market (SAM), and Serviceable Obtainable Market (SOM) for a product idea by asking adaptive, contextually relevant questions. Use this to build defensible market size estimates backed by real-world citations, economic projections, and population data—essential for pitching to investors, securing budget, or validating product-market fit. This is not a back-of-napkin guess—it's a structured, citation-backed analysis that withstands scrutiny. ## Input **Works best with:** The product or idea being sized, and any market constraints you already know (geography, vertical, customer type). **Also useful:** Pricing assumptions, comparable companies, and the audience for the numbers (investors, execs, business case). Anything supplied with the invocation itself — text after the skill name, a pasted context dump, or an appended `ARGUMENTS:` line — counts as answers already given. Use it and skip whatever it covers; don't re-ask. **Arriving empty-handed? That works too.** The calculator opens by asking what you're sizing and for whom, then works through method and assumptions. …
Read the whole file at its exact version.
How to install
mdr add deanpeters/product-manager-skills/tam-sam-som-calculator@sha256:2870c8d83df118dfThe line at the top of this page pins the label git:20260810.b68bf96, 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_ggeqknbfpwhjihue)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Feb 11, 2026 and Aug 10, 2026, about one every 45 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260810.b68bf96 latest | 2026-08-10 | b68bf96 | 19,112 B | A | view · diff |
| git:20260717.0ad6f9c | 2026-07-17 | 0ad6f9c | 18,684 B | A | view · diff |
| git:20260704.6a4fbf2 | 2026-07-04 | 6a4fbf2 | 15,726 B | A | view · diff |
| git:20260309.0a8f6ac | 2026-03-09 | 0a8f6ac | 14,896 B | A | view · diff |
| git:20260211.cc730da | 2026-02-11 | cc730da | 14,488 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 (19112 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
deanpeters/product-manager-skills · 7,599 stars · license a license file GitHub does not identify · pushed 2026-10-16 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ggeqknbfpwhjihue GET https://markdownregistry.com/api/v1/resolve?ref=deanpeters/product-manager-skills/tam-sam-som-calculator GET https://markdownregistry.com/api/v1/blob/2870c8d83df118df9dd71695b4e03d9b7c7fab20d60b40fd29347497bf350530
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.
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