factcheck-subagent-needs-complete-sourceslisted

# Fact-check subagents need complete primary sources ## Problem You dispatch a subagent to independently fact-check a document against its sources. To save context or tokens, you pass the agent a summary or partial dump of one source instead of the full original. The agent then reports a **false positive**: "Claim X is unsupported — the term appears in no source." The claim was actually fine; the supporting text was in the part of the source you abridged away. The failure is asymmetric and dangerous: a missing source region does not make the agent say "I can't tell." It makes the agent confidently say "unsupported" or "fabricated" — because absence-of-evidence reads as evidence-of-absence when the agent believes it holds the complete source. ## Context / Trigger Conditions - About to launch an Agent/Task subagent to "fact-check", "verify", "independently check", "stress-test", or "review the claims in" a document. - Assembling the source bundle / writing the prompt for that agent. - A verification subagent returns "claim X unsupported / appears nowhere / fabricated / not in any source" — especially for one specific claim while everything else verifies cleanly. ## Solution **Prevention — when assembling the agent's sources:** 1. Pass the agent the COMPLETE primary source (full file, full document dump, full repo clone), not a hand-written summary of it. If a source is large, give it the real artifact and let the agent read what it needs — do not pre-dige