| Tool | Status | Notes |
|---|---|---|
| `paper_search` | No results | Multiple query formulations for EDN3, EDNRB, Waardenburg–Shah syndrome, Waardenburg syndrome type IV, and Hirschsprung disease returned no retrievable papers. |
| `gather_evidence` | Blocked | Could not run because no papers had been retrieved; the tool reported it was not gathering evidence due to having no papers. |
| `open_targets_search` | Failed | Disease-target lookup attempts failed after retries, so no OpenTargets evidence could be used. |
| `clinical_trials_search` | None returned | Searches for Waardenburg syndrome type IV, EDNRB, EDN3, and Hirschsprung-related queries returned zero trials. |
| `patent_search` | None returned | Searches for EDNRB, EDN3, Waardenburg–Shah, and Hirschsprung-related terms returned no patents. |


*Table: This table summarizes the failed evidence-retrieval steps for EDN3/EDNRB Waardenburg–Shah syndrome in the current run. It is useful for documenting why no cited disease report could be generated.*