crucible

crucible is a skill for Claude Code, Codex from AdityaVasireddy/agent-skills. It costs 143 tokens per session (2,517 once invoked), scanned A, original, MIT.

A structured way to test a business or product idea by separating what the founder can judge from claims that real-world experiments must test.

In plain words
What is it for?
Use it to pressure-test an idea, examine its buyer and revenue assumptions, review experiment results, and decide what to test next.
Why use it?
It replaces unsupported predictions with explicit assumptions and one concrete experiment aimed at the riskiest unknown.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to pressure-test an idea, examine its buyer and revenue assumptions, review experiment results, and decide what to test next.

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Install with agentmods
npx agentmods add skills/adityavasireddy/agent-skills/crucible
Install

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.

Any agent
npx skills add AdityaVasireddy/agent-skills --skill crucible
Clone the repo
git clone --depth 1 https://github.com/AdityaVasireddy/agent-skills

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for crucible

README.md
[![agentmods](https://agentmods.dev/badge/skills/adityavasireddy/agent-skills/crucible/github.svg)](https://agentmods.dev/skills/adityavasireddy/agent-skills/crucible)
Your own site
<a href="https://agentmods.dev/skills/adityavasireddy/agent-skills/crucible"><img src="https://agentmods.dev/badge/skills/adityavasireddy/agent-skills/crucible/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.

agentmods 80×15 button for crucible

Your own site · 80×15
<a href="https://agentmods.dev/skills/adityavasireddy/agent-skills/crucible"><img src="https://agentmods.dev/badge/skills/adityavasireddy/agent-skills/crucible.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 143 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,517 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00143 $0.02517
Opus 5 $0.00072 $0.01259
Sonnet 5 $0.00029 $0.00503
Haiku 4.5 $0.00014 $0.00252

Measured 11d ago against content hash 3cc54d6c4eb2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

crucible 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.

crucible/SKILL.md · 235 lines

How it starts

The opening of the file, as written. The whole thing — 235 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Crucible — judgment that compounds

Three judges, strictly scoped. You judge only what the founder can verify tonight from stated facts. Reality judges everything empirical — demand, price, channel, feasibility — through experiments the founder runs. The founder judges the bet. Never predict whether the venture will succeed; judge whether the argument holds, and make the collision with reality as cheap as possible.

Session flow: Input → Interrogation → Bench → Evidence → Experiment → Ledger. One page of output, ending in one experiment.

Stage 1 — Input

Returning venture (founder has experiment results or a ledger): load .crucible/<venture-slug>.md — or ask them to paste the ledger block if there's no file access. Then, before any new analysis:

  1. Score their prediction against the actual result, out loud.
  2. Check the pre-commitment: "You said if this failed you'd ___ — is that what you're doing?"
  3. Update the stack from the outcome, then continue at Bench with the next riskiest assumption.

New venture: ask only for what's missing, one batch, max 4 questions: the idea · buyer and revenue model · founder's edge · goal + affordable loss (lifestyle or venture-scale; what they can lose without ruin). No second round.

Scope gate: Crucible needs a customer and a revenue path. For a pure research/frontier bet, say it's out of scope and give only the two honest analyses available: a ruin check and affordable-loss sizing.

Condense to the Brief — one neutral paragraph, adjectives stripped. Every later stage anchors on this text.

Stage 2 — Interrogation

Three examiners ask questions — never conclusions, never verdicts. One batch total; take answers at face value; a vague or missing answer is a finding, not a blocker.

  • The Skeptic — how it dies: costs, margins, dependencies, liabilities, and the free substitute (doing nothing, or the current workaround).
  • The Operator — how customers arrive: which channel, the first ten customers by name-shape, and whether the founder's edge maps to the actual daily work of this business.
  • The Buyer — first person, in the target customer's voice: what I'd pay, my real objection, what I'd do instead. Always ends with the 3 questions the founder should ask 5 real customers this week — the Buyer generates hypotheses, never evidence.

Read the full file on GitHub · 235 lines

Changes

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.

  1. 11d ago First seen · 235 lines · 143 tokens per session scan A 3cc54d6c4eb2

Subscribe to this mod's changes

crucible is a skill published in the GitHub repository AdityaVasireddy/agent-skills (2 stars, last pushed yesterday), licensed MIT. It adds 143 tokens to every session and 2,517 once invoked, about $0.0007 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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