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.
npx skills add marcos-sponton/frameworks-as-skills --skill mom-testgit clone --depth 1 https://github.com/marcos-sponton/frameworks-as-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/marcos-sponton/frameworks-as-skills/mom-test)<a href="https://agentmods.dev/skills/marcos-sponton/frameworks-as-skills/mom-test"><img src="https://agentmods.dev/badge/skills/marcos-sponton/frameworks-as-skills/mom-test/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/marcos-sponton/frameworks-as-skills/mom-test"><img src="https://agentmods.dev/badge/skills/marcos-sponton/frameworks-as-skills/mom-test.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00263 | $0.02763 |
| Opus 5 | $0.00131 | $0.01381 |
| Sonnet 5 | $0.00053 | $0.00553 |
| Haiku 4.5 | $0.00026 | $0.00276 |
Grade A, and why
mom-test 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 11d 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.
How it starts
The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.
The Mom Test
Rob Fitzpatrick's practical rules for having useful customer conversations — distilled from the 2013 book The Mom Test: How to talk to customers & learn if your business is a good idea when everyone is lying to you (Robfitz Ltd, self-published; revised and expanded edition via Simon & Schuster, 2026), plus a decade of Fitzpatrick's podcast interviews, Udemy course, blog posts, and ongoing refinements including the 2nd edition beta. Fitzpatrick is a YCombinator alum (S07), serial entrepreneur, and author of three books (The Mom Test, The Workshop Survival Guide, Write Useful Books).
The core insight is deceptively simple: you should never ask people if your business idea is good. Even your mom would lie to you about that. Instead, ask about their life, their problems, their past behavior, what they've already tried. The "test" is: could you ask this question to your mom and still get a useful, unbiased answer? If yes, it's a good question. If you'd only get a useful answer from someone who'd buy your product, you're pitching, not learning.
This skill helps you ask better questions, detect bad data, and evaluate whether a conversation actually produced signal — not just compliments.
When this skill activates
Use this skill when the user is:
- Preparing for customer interviews or discovery calls and wants to design good questions.
- Reviewing notes from a customer conversation and trying to evaluate whether the signal is real.
- Getting lots of positive feedback ("everyone says they'd use it!") but not seeing traction, and wondering why.
- Planning user research for a new product, feature, or business idea.
- Writing a discussion guide or interview script.
- Trying to validate a startup idea by talking to potential customers.
- Asking how to tell the difference between genuine demand and politeness.
- Designing a customer segmentation strategy for early-stage conversations.
- Running sales conversations and unsure whether they're learning or pitching.
- Getting feature requests and unsure what to do with them.
- Post-meeting — wondering whether compliments and "that's so cool" count as validation.
What ships with it
12 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.
- evals/evals.json 10 KB
- examples/.gitkeep 0 B
- README.md 2.1 KB
- references/applications.md 9.1 KB
- references/author-live-sources.md 6.7 KB
- references/examples.md 9.4 KB
- references/heuristics.md 11 KB
- references/method.md 12 KB
- references/post-book.md 12 KB
- references/prompts.md 7.2 KB
- references/sources.md 8.9 KB
- references/voice-and-tone.md 8.6 KB
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.
- 11d ago First seen · 103 lines · 263 tokens per session scan A 9076d2961dcf
mom-test is a skill published in the GitHub repository marcos-sponton/frameworks-as-skills (1 stars, last pushed 1mo ago), licensed MIT. It adds 263 tokens to every session and 2,763 once invoked, about $0.0013 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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