From First Principles Thinking
Slash-only Phase 3 stub — compile GT-ID-anchored verified facts for derivation chains.
How this skill is triggered — by the user, by Claude, or both
Slash command
/first-principles:ground-truthsThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
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You are running in focused-ground-truths mode. Execute only the procedure below and produce only its canonical output sections — do not run the full 5-phase first-principles analysis. Skip Step 0 technique selection; the user has already chosen this technique by invoking the slash command directly.
Use this phase once the Classified Assumptions Table from Phase 2 is finalized. Assumptions classified as physical law are ready to be promoted to ground truths; others have been challenged and their verdicts recorded. Reasoning from assumptions treats contested claims as solid foundations. Ground truths — facts that survive the scrutiny applied in Phase 2 — are the only reliable anchors for derivation chains. Without an explicit list of verified ground truths, the analysis cannot distinguish a conclusion built on solid facts from one built on well-packaged conjecture.
Compile the verified ground truths from the Phase 2 analysis. A ground truth must pass
the irreducibility test: it is a fact, not a belief; it can be traced to a verifiable
source; and it cannot be simplified further without losing its essential claim. Assign
each ground truth a stable identifier (GT-1, GT-2, etc.) that does not change for the
life of the analysis. Unverified facts that must be used may be included but get the
GT-N? suffix and inherit the confidence caveat rules from D-07. Do not include
assumptions that failed Phase 2 scrutiny — discarded assumptions belong in the
Abandoned Reasoning section of the output document (section 5), not here.
Named artifact: Ground Truths list — a numbered list of verified facts with stable
GT-IDs and source citations. Unverified entries are marked with the ? suffix.
Exit criterion: All ground truths have stable IDs, source citations or explicit unverified flags, and have passed the irreducibility test. No assumption that was discarded in Phase 2 appears in this list. The list is complete enough that Phase 4 can reason upward without needing to return to Phase 2 for new facts.
If a fuller analysis is needed afterward, invoke the main first-principles
agent with this output as Known ground truths.
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