0. Source disclosure (required)
SYNTHETIC EXEMPLAR — constructed illustrative scenario, not a court-documented incident.
The underlying authorities (Iqbal, Twombly) are real. The RAG pipeline, production incident, date, and filing narrative below are constructed to teach the gap between citation existence and proposition support. There is no incident date because there was no incident.
source_class: synthetic_exemplar
1. The teaching scenario (not a crime scene)
Blueprint scenario: a RAG stack retrieves the correct opinion chunk for Ashcroft v. Iqbal, 556 U.S. 662 (2009) — but the generation layer inverts the pleading standard. The citation would pass every link validator while the proposition remains wrong.
The canonical failure for legal AI: the authority exists, the citation is correct, and the proposition is wrong.
2. The Artifact (constructed LLM-style output)
"Under Ashcroft v. Iqbal, 556 U.S. 662, 678 (2009), a court must accept as true
all factual allegations in the complaint, including those directly contradicted by
exhibits attached to the motion to dismiss, when evaluating Rule 12(b)(6) motions
in federal question cases."
"See also Bell Atlantic Corp. v. Twombly, 550 U.S. 544, 555 (2007) (requiring only
a showing of 'possible' liability without plausibility screening in complex
commercial disputes)."
3. The Evidence Breakdown (why this pattern matters)
Claimed Authority: Ashcroft v. Iqbal, 556 U.S. 662, 678 (2009).
Check: Iqbal is real. The attributed rule inverts documentary-evidence and legal-conclusion treatment. Existence of the citation does not entail support for the proposition.
Claimed Authority: Bell Atlantic v. Twombly, 550 U.S. 544, 555 (2007).
Check: Twombly is real and established the plausibility standard — the opposite of "possible liability without plausibility screening."
Pattern: Retrieval can return correct chunks while proposition assembly fails. Tools that stop at citation existence cannot detect this class.
4. Verification note (honest scope)
Existence: the cited reporters resolve to real opinions. Support: the attributed propositions are not entailed by the opinion text at the stated pins — that is the blueprint lesson.
This record does not claim a production Pinecone + GPT-4o incident occurred on a specific date. It separates authority verification from proposition verification for teaching and evaluation design.