Retrieve protein and nucleotide sequences from NCBI databases using E-utilities. Supports direct accession lookup, CDS translation, gene+organism search, locus lookup, PubMed-linked sequences, patent protein extraction, and organism+length fallback search. Use when you need to fetch biological sequences by accession, gene name, locus tag, PubMed ID, or patent number.
uv: Read the uv skill and follow its Setup instructions to ensure
uv is installed and on PATH.
User Notification: If .licenses/ncbi_sequence_fetch_LICENSE.txt does not
already exist in the workspace root directory then (1) prominently notify
the user to check the terms at https://www.ncbi.nlm.nih.gov/ and
https://www.ncbi.nlm.nih.gov/home/about/policies/, then (2) create the file
recording the notification text and timestamp.
.env file: Make sure the .env file exists in your home directory.
Create one if it does not exist.
NCBI_API_KEY (optional): Raises the NCBI rate limit from 3 to 10
requests/second. The skill works without it, but a key is recommended if the
user plans many queries or encounters a 429 error. You can register for a
key for free at https://www.ncbi.nlm.nih.gov/account/settings/. You MUST
use the safe credentials protocol in the credentials skill to check for
and request this key if this skill looks relevant to the user's request.
