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education
31

prove-plus-comm

Guidance for proving mathematical properties in Coq using induction, specifically addition commutativity and similar arithmetic lemmas. This skill should be used when working with Coq proof assistants to complete induction proofs, fill in proof cases, or apply standard library lemmas like plus_n_O and plus_n_Sm.

letta-ai
letta-ai
documentation
open
education
31

prove-plus-comm

Guide for completing Coq proofs involving arithmetic properties like addition commutativity. This skill should be used when working on Coq proof files that require proving properties about natural number arithmetic using induction, particularly when lemmas like plus_n_O and plus_n_Sm are involved.

letta-ai
letta-ai
documentation
open
knowledge-base
31

password-recovery

This skill provides guidance for recovering passwords or sensitive data from disk images, corrupted files, or forensic scenarios. Use this skill when tasked with extracting passwords from disk images, recovering deleted files containing credentials, or performing data forensics to find lost authentication information.

letta-ai
letta-ai
documentation
open
divination-mysticism
31

feal-differential-cryptanalysis

Guidance for implementing differential cryptanalysis attacks on FEAL and similar Feistel ciphers. This skill should be used when asked to break FEAL encryption, recover cipher keys through differential attacks, or implement cryptanalysis techniques on block ciphers with weak round functions. Covers proper differential characteristic construction, not ad-hoc statistical methods.

letta-ai
letta-ai
lifestyle
open
divination-mysticism
31

regex-chess

Guidance for generating legal chess moves using only regex pattern matching and substitution. This skill applies when implementing chess move generators constrained to regex-only solutions, FEN notation parsing/manipulation, or similar pattern-matching-based board game logic. Use this skill for tasks requiring regex-based state transformations on structured string representations.

letta-ai
letta-ai
lifestyle
open
divination-mysticism
31

chess-best-move

Guide for analyzing chess positions from images and determining optimal moves. This skill should be used when asked to find the best move, checkmate, or tactical solution from a chess board image. It provides structured approaches for image-based chess analysis, piece detection calibration, position validation, and move verification.

letta-ai
letta-ai
lifestyle
open
divination-mysticism
31

feal-linear-cryptanalysis

Guide for performing linear cryptanalysis attacks on FEAL and similar Feistel ciphers. This skill should be used when tasks involve breaking FEAL encryption, recovering cipher keys using known plaintext-ciphertext pairs, or implementing linear cryptanalysis techniques. Applies to cryptographic challenges mentioning "linear attack," "FEAL," "Feistel cipher analysis," or key recovery from plaintext-ciphertext pairs.

letta-ai
letta-ai
lifestyle
open
divination-mysticism
31

chess-best-move

Guide for analyzing chess board images to find the best move(s). This skill should be used when tasks involve analyzing chess positions from images, detecting piece positions, identifying winning moves, or solving chess puzzles. Applies to tasks requiring image-based chess board analysis and move calculation.

letta-ai
letta-ai
lifestyle
open
literature-writing
31

polyglot-rust-c

Guidance for creating polyglot source files that compile and run correctly as both Rust and C/C++ programs. This skill should be used when asked to create code that is valid in multiple programming languages simultaneously, particularly Rust and C/C++ polyglots.

letta-ai
letta-ai
lifestyle
open
academic
31

yelp-search

Search Yelp for local businesses, get contact info, ratings, and hours. Use when finding services (cleaners, groomers, restaurants, etc.), looking up business phone numbers to text, or checking ratings before booking. Triggers on queries about finding businesses, restaurants, services, or "look up on Yelp".

letta-ai
letta-ai
research
open
astronomy-physics
31

path-tracing

Guidance for implementing path tracers and ray tracers to reconstruct or generate images. This skill applies when tasks involve writing C/C++ ray tracing code, reconstructing images from reference images, or building rendering systems with spheres, shadows, and procedural textures. Use for image reconstruction tasks requiring similarity matching.

letta-ai
letta-ai
research
open
bioinformatics
31

protein-assembly

Guidance for designing fusion protein gBlock sequences from multiple protein sources. This skill applies when tasks involve combining proteins from PDB databases, plasmid files, and fluorescent protein databases into a single optimized DNA sequence with specific linkers and codon optimization requirements.

letta-ai
letta-ai
research
open
bioinformatics
31

protein-assembly

Guidance for designing and assembling multi-component fusion protein sequences, particularly for FRET biosensors and tagged constructs. This skill applies when tasks involve identifying proteins by spectral properties (excitation/emission wavelengths), assembling fusion proteins from multiple domains, codon optimization with GC content constraints, working with PDB sequences and fluorescent protein databases, or generating gBlock sequences for gene synthesis.

letta-ai
letta-ai
research
open
bioinformatics
31

dna-assembly

Guidance for Golden Gate assembly primer design and DNA assembly tasks. This skill should be used when designing primers for Golden Gate cloning, Type IIS restriction enzyme assembly, or multi-fragment DNA assembly workflows. It covers overhang selection, primer structure, assembly simulation, and verification strategies.

letta-ai
letta-ai
research
open
bioinformatics
31

feal-linear-cryptanalysis

This skill provides guidance for FEAL cipher linear cryptanalysis tasks. It should be used when recovering encryption keys from FEAL-encrypted data using known plaintext-ciphertext pairs, implementing linear approximation attacks on block ciphers, or solving cryptanalysis challenges involving the FEAL cipher family. The skill emphasizes mathematical analysis over brute-force approaches.

letta-ai
letta-ai
research
open
scientific-computing
31

raman-fitting

This skill provides guidance for fitting peaks in Raman spectroscopy data, particularly for materials like graphene. Use this skill when tasks involve Raman spectrum analysis, peak fitting (G peak, 2D peak, D peak), or spectroscopic curve fitting using Lorentzian, Gaussian, or Voigt functions.

letta-ai
letta-ai
research
open
bioinformatics
31

dna-assembly

Guidance for DNA assembly tasks including Golden Gate assembly, Gibson assembly, and restriction enzyme-based cloning. This skill should be used when designing primers for Type IIS restriction enzymes (BsaI, BsmBI, etc.), creating fusion proteins, or assembling multiple DNA fragments. Covers primer structure requirements, overhang design, and verification strategies.

letta-ai
letta-ai
research
open
bioinformatics
31

dna-insert

Specialized skill for designing primers to insert DNA sequences into circular plasmids using Q5 site-directed mutagenesis (SDM). This skill should be used when tasks involve inserting sequences into plasmids, designing primers for Q5 SDM insertions, or converting an input plasmid to an output plasmid with additional sequence. The skill provides workflows for understanding Q5 SDM mechanics, proper primer design with annealing regions, Tm calculation, and critical verification strategies.

letta-ai
letta-ai
research
open
bioinformatics
31

sam-cell-seg

This skill provides guidance for tasks involving MobileSAM or Segment Anything Model (SAM) for cell segmentation, mask refinement, and polygon extraction from images. Use when working with SAM-based image segmentation pipelines, converting masks to polygons, processing CSV-based coordinate data, or integrating deep learning segmentation models into processing scripts.

letta-ai
letta-ai
research
open
bioinformatics
31

dna-insert

Guide for designing DNA insertion primers for site-directed mutagenesis (SDM) using Q5 or similar kits. This skill should be used when tasks involve inserting DNA sequences into plasmids, designing mutagenesis primers, or working with PCR-based insertion methods. Provides verification strategies, common pitfalls, and procedural guidance for correct primer design.

letta-ai
letta-ai
research
open
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