Connecticut Magistrate Orders Disclosure of AI Prompts in Shell Case
On May 18, 2026, a Connecticut magistrate ruled AI prompts are discoverable in Shell litigation.
Why it matters: Legal teams face new discovery demands as courts require disclosure of AI-assisted expert methods, increasing risks of sanctions and evidentiary challenges.
- Magistrate Judge Thomas O. Farrish ruled AI prompts used by expert Dr. Naomi Oreskes must be disclosed under Federal Rule of Civil Procedure 26 on May 18, 2026.
- The Conservation Law Foundation (CLF) must produce AI prompts in their environmental lawsuit against Shell Oil Company.
- The court rejected CLF’s argument that AI prompts qualify as protected 'expert notes' under a Rule 29 discovery agreement.
- This is among the first rulings to mandate disclosure of AI inputs in expert witness methodology in federal litigation.
On May 18, 2026, Magistrate Judge Thomas O. Farrish of the District of Connecticut ordered the Conservation Law Foundation (CLF) to disclose AI-generated prompts used by their expert witness, Dr. Naomi Oreskes, in a lawsuit against Shell Oil Company. The court held these prompts are discoverable under Federal Rule of Civil Procedure 26 because they form a key part of the expert's methodology.
CLF argued that the prompts were protected by a Rule 29 agreement shielding 'expert notes, drafts, or communications' from disclosure. Judge Farrish rejected this, noting the agreement did not explicitly cover AI prompts as 'notes' or 'communications' generated during report drafting.
The case, Conservation Law Foundation v. Shell Oil Co., represents an early judicial effort to define the scope of discovery for AI-assisted expert evidence. It underscores how courts may treat AI prompt engineering as integral to the reliability and transparency of expert testimony.
Christopher Kilian, Vice President for Strategic Litigation at CLF, commented, "This ruling makes clear that Shell’s attempts to stall won’t work. The Court saw through Shell’s baseless arguments and denied their motion on every front. CLF will continue to push this case forward and hold Shell accountable." While supportive of CLF's position, legal experts caution that varying rulings could emerge as courts nationwide assess AI's role in discovery.
This ruling signals increasing scrutiny on AI tools within litigation and highlights compliance challenges. Legal teams must now develop clear protocols for documenting and producing AI-generated inputs to avoid risks of sanctions and evidentiary disputes.
As courts further consider discovery obligations involving AI in expert reports, parties should monitor evolving case law and federal rule interpretations to adapt their discovery practices accordingly.
By the numbers:
- May 18, 2026 — Date Magistrate Judge Farrish issued discovery ruling
- Rule 26 — Federal rule under which AI prompts were deemed discoverable
- Rule 29 — Discovery agreement clause rejected as shield for AI prompts
Yes, but: This ruling comes from a magistrate judge, not a district judge or appellate court, so its precedential authority may be limited. Different courts might rule differently on AI prompt discovery.
What's next: Subsequent rulings in this case and others will clarify the scope of AI prompt discoverability. Parties should watch for district court reviews or appeals that might set broader standards.