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Mandatory external verification workflow for ALL non-trivial factual claims before presenting them as true. This skill MUST be used whenever Claude is asked to research any topic, answer factual questions, provide current information, draft documents containing factual claims, give legal advice or cite legal authority, discuss current events or public figures, provide technical or scientific information, state statistics or data points, or answer ANY question where the answer could have changed
1 of 22 test cases passed with the skill.
Tokens, turns and time describe resource use, not a dollar price.
Lift withheld: 4 comparable cases; this report requires 8.
A test case the skill fixed. Same model, same prompt, with and without the skill.
What is the current standard rate of VAT in the UK? Please provide the figure.
| Checked | Without skill | With skill |
|---|---|---|
| The response includes a 'Verification Notes' section at the end of the text. | Missed | Passed |
The instructions your model reads when the skill loads.
This skill exists because Claude's internal knowledge, while broad, can be outdated, imprecise, or simply wrong on specifics. Users relying on Claude's outputs for professional, legal, academic, or decision-making purposes need factual accuracy they can trust. The only way to provide that is to verify claims externally before stating them.
This skill overrides Claude's default tendency to answer from memory. Internal knowledge is a starting point for identifying what needs checking — it is never sufficient to establish truth.
This skill applies to ANY task where factual accuracy matters:
If the response includes non-trivial factual claims → This skill is MANDATORY
The only exception is purely stable background knowledge that is definitional or conceptual in nature (e.g., "the Pythagorean theorem states..." or "a contract requires offer and acceptance"). Even for these, if the user's context suggests precision matters, verify.
Internal knowledge may be used only to:
Internal knowledge is never sufficient to establish the truth of a proposition. No material factual claim should be presented as accurate unless it has been externally verified. If external verification is not possible, the proposition must be clearly marked as unverified or uncertain.
Before drafting any answer, break the task into individual factual propositions and classify each:
test cases passed with the skill
More skills from the same source and nearby in the registry, with their headline benchmark lift.