ask-then-verify

ask-then-verify is a skill for Claude Code, Codex from arunveersingh/ai. It costs 48 tokens per session (477 once invoked), scanned A, original, Apache-2.0.

A practice for making factual answers easier to check before relying on them. It asks the responder to label claims as facts or guesses, provide real sources, and say UNKNOWN when a claim cannot be supported.

In plain words
What is it for?
Use it when asking an agent for factual information, researching a question, or reviewing an answer before sharing or shipping it.
Why use it?
A confident answer can still be wrong, especially when it has no evidence. This approach separates uncertainty from verified information and prompts a human to check the cited source before using it.

Skill for Claude CodeCodex

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

Good fit Use it when asking an agent for factual information, researching a question, or reviewing an answer before sharing or shipping it.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/arunveersingh/ai/day-01-ask-then-verify
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 arunveersingh/ai --skill day-01-ask-then-verify
Clone the repo
git clone --depth 1 https://github.com/arunveersingh/ai

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 ask-then-verify

README.md
[![agentmods](https://agentmods.dev/badge/skills/arunveersingh/ai/day-01-ask-then-verify/github.svg)](https://agentmods.dev/skills/arunveersingh/ai/day-01-ask-then-verify)
Your own site
<a href="https://agentmods.dev/skills/arunveersingh/ai/day-01-ask-then-verify"><img src="https://agentmods.dev/badge/skills/arunveersingh/ai/day-01-ask-then-verify/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 ask-then-verify

Your own site · 80×15
<a href="https://agentmods.dev/skills/arunveersingh/ai/day-01-ask-then-verify"><img src="https://agentmods.dev/badge/skills/arunveersingh/ai/day-01-ask-then-verify.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 48 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 477 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 $0.00048 $0.00477
Opus 5.5 $0.00019 $0.00191
Sonnet 5.5 $0.00010 $0.00095
Haiku 4.5 $0.00005 $0.00048

Measured 23d ago against content hash cef329a4de8b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ask-then-verify 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 23d 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.

courses/make-ai-fail-safely/practice/day-01-ask-then-verify/SKILL.md · 35 lines

What it actually says

Ask, then verify

Confident wrongness is a false claim in the same calm voice as a true one. Fix it in two moves: ask so the answer is more likely correct or clearly UNKNOWN, then verify. Better asking cuts fiction; verification still decides what ships.

Paste Part A into any chat. Do Part B yourself. Swap brackets. Tighten or drop rules if you need to.

Part A — Ask (paste / adapt)

Answer this question: [YOUR QUESTION]

Rules:
1. Label each claim FACT or GUESS.
2. For every FACT, include a real source: a working URL, or the exact document title and where to look (section / page / heading).
3. If you cannot cite a real source, write UNKNOWN for that claim. Do not invent links, titles, names, dates, or numbers.
4. Prefer a quoted line or a URL over a vague summary.

Optional tighteners: ask for a checkable pointer ("Quote the line / give the URL that states X") instead of an open "what's the date of Y." Treat unlabeled "facts" as guesses until Part B.

Part B — Verify (you do this)

  1. Open the citation. Click the link or find the named doc. No citation, invented link/title, or UNKNOWN → do not paste the claim; stop or look yourself.
  2. Draft vs verified. Keep the reply as a draft. Ship only a verified version after at least one real check. Same window is fine; two buckets are not optional.
  3. Optional: After you score the draft (finished / detailed / correct-as-you-know), run one independent check (search or a second model). For claims that matter, name what would prove it wrong before you use it.

Done when: you either opened a real source and decided paste-ready / not, or you correctly stopped on UNKNOWN.

Lesson: Day 1 — Confident Wrongness

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. 23d ago First seen · 35 lines · 48 tokens per session scan A cef329a4de8b

Subscribe to this mod's changes

ask-then-verify is a skill published in the GitHub repository arunveersingh/ai (3 stars, last pushed 3d ago), licensed Apache-2.0. It adds 48 tokens to every session and 477 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-10-03.

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