single-cell-foundation-model-langcell

single-cell-foundation-model-langcell is a skill for Claude Code, Codex from PharMolix/OpenBioMed. It costs 67 tokens per session (737 once invoked), scanned A, original, MIT.

A workflow guide for LangCell, a research model that matches single-cell gene data with text to identify cell types. It covers zero-shot and few-shot annotation, data preparation, and cell-encoder fine-tuning.

In plain words
What is it for?
Use it to label cells with no or few examples, prepare tokenized single-cell data, fine-tune the LangCell cell encoder, or create text descriptions of possible cell identities.
Why use it?
It helps avoid guessing which LangCell workflow, data format, or supporting files are needed. It also keeps LangCell work separate from ordinary single-cell analysis.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to label cells with no or few examples, prepare tokenized single-cell data, fine-tune the LangCell cell encoder, or create text descriptions of possible cell identities.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/pharmolix/openbiomed/single-cell-foundation-model-scrna-seq-langcell
About the project

OpenBioMed is an agent platform and toolkit collection for biomedical research and drug discovery, covering areas such as molecular design, protein analysis, and single-cell data analysis. It is intended for researchers and provides the biomedical skills listed in the catalogue as workflows for Claude Code.

PharMolix/OpenBioMed · 1,106 stars · on GitHub

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add PharMolix/OpenBioMed --skill single-cell-foundation-model-scrna-seq-langcell
Clone the repo
git clone --depth 1 https://github.com/PharMolix/OpenBioMed

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for single-cell-foundation-model-langcell

README.md
[![agentmods](https://agentmods.dev/badge/skills/pharmolix/openbiomed/single-cell-foundation-model-scrna-seq-langcell/github.svg)](https://agentmods.dev/skills/pharmolix/openbiomed/single-cell-foundation-model-scrna-seq-langcell)
Your own site
<a href="https://agentmods.dev/skills/pharmolix/openbiomed/single-cell-foundation-model-scrna-seq-langcell"><img src="https://agentmods.dev/badge/skills/pharmolix/openbiomed/single-cell-foundation-model-scrna-seq-langcell/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for single-cell-foundation-model-langcell

Your own site · 80×15
<a href="https://agentmods.dev/skills/pharmolix/openbiomed/single-cell-foundation-model-scrna-seq-langcell"><img src="https://agentmods.dev/badge/skills/pharmolix/openbiomed/single-cell-foundation-model-scrna-seq-langcell.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 67 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 737 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00067 $0.00737
Opus 5 $0.00034 $0.00368
Sonnet 5 $0.00013 $0.00147
Haiku 4.5 $0.00007 $0.00074

Measured 12d ago against content hash 68d45fd312e3, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

single-cell-foundation-model-langcell scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/single-cell-foundation-model-scrna-seq-langcell/SKILL.md · 79 lines

How it starts

The opening of the file, as written. The whole thing — 79 lines — stays where its author put it; the contents beside it link to each section on GitHub.

LangCell

Use This Skill When

Use this skill for the local LangCell project at /DATA/disk0/zhaosy/home/LangCell. It is the right choice when the task involves:

  • zero-shot cell identity or cell type annotation from tokenized single-cell data
  • few-shot cell type annotation with very limited labels
  • finetuning only the LangCell cell encoder (LangCell-CE)
  • preprocessing AnnData into the tokenized format expected by LangCell
  • preparing text descriptions for candidate cell identities
  • understanding how LangCell combines cell embeddings and text embeddings

Do not use this skill for ordinary Scanpy analysis that does not depend on LangCell.

Start Here

  1. Confirm whether the user wants zero-shot annotation, few-shot annotation, or cell-encoder-only finetuning.
  2. Check that the input is already tokenized, or route through preprocessing first.
  3. Check whether the required external assets exist: checkpoints, tokenized dataset, ontology / text-description JSON.
  4. Prefer the zero-shot path first if the user is exploring LangCell rather than benchmarking a supervised baseline.

Choose A Path

Zero-shot annotation

Start here for most LangCell usage. The defining behavior is:

  • encode cells with cell_bert + cell_proj
  • encode candidate texts with text_bert + text_proj
  • score cell-text matches with ctm_head
  • combine similarity and matching scores for final predictions

Use LangCell-annotation-zeroshot/zero-shot.ipynb as the primary reference path.

Few-shot annotation

Use LangCell-annotation-fewshot/fewshot.py when only a tiny labeled support set is available and the user still wants the multimodal LangCell path.

LangCell-CE finetuning

Use LangCell-CE-annotation/finetune.py when the user wants a standard supervised classifier on top of the pretrained cell encoder.

Preprocessing

LangCell does not take raw .h5ad directly for these downstream scripts. First:

  • read AnnData with scanpy
  • add obs["n_counts"]
  • ensure var["ensembl_id"] exists
  • tokenize with LangCellTranscriptomeTokenizer
  • save with save_to_disk(...)

Read the full file on GitHub · 79 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago First seen · 79 lines · 67 tokens per session scan A 68d45fd312e3

Subscribe to this mod's changes

single-cell-foundation-model-langcell is a skill published in the GitHub repository PharMolix/OpenBioMed (1,106 stars, last pushed 1mo ago), licensed MIT. It adds 67 tokens to every session and 737 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

Other skills, from other repositories

torchdrug

Build and troubleshoot TorchDrug 0.2.1 workflows for molecular graphs, property prediction, self-supervised pretraining, molecule generation, retrosynthesis, protein representation learning, and knowledge graph reasoning. Use when code imports torchdrug or needs its datasets, models, tasks, or Engine.

K-Dense-AI/scientific-agent-skills · 61 tokens

arboreto

Infer gene regulatory networks (GRNs) from gene expression data using scalable algorithms (GRNBoost2, GENIE3). Use when analyzing transcriptomics data (bulk RNA-seq, single-cell RNA-seq) to identify transcription factor-target gene relationships and regulatory interactions. Supports distributed computation for…

K-Dense-AI/scientific-agent-skills · 66 tokens

pyhealth

Build clinical/healthcare deep-learning pipelines with PyHealth — loading EHR/signal/imaging datasets (MIMIC-III/IV, eICU, OMOP, SleepEDF, ChestXray14, EHRShot), defining tasks (mortality, readmission, length-of-stay, drug recommendation, sleep staging, ICD coding, EEG events), instantiating models (Transformer…

K-Dense-AI/scientific-agent-skills · 216 tokens

deepspot-m

Generate transcriptome-wide virtual spatial transcriptomics from H&E histology with DeepSpot-M. Use when you need spatial gene expression in log1p-CPM for 224x224 tiles at about 20x, want to query protein-coding genes by symbol instead of a fixed panel, or want to run prediction across a whole slide after tiling with…

K-Dense-AI/scientific-agent-skills · 80 tokens

nemo-mbridge-perf-expert-parallel-overlap

Validate and use MoE expert-parallel communication overlap in Megatron-Bridge, including overlapmoeexpertparallelcomm, delaywgradcompute, and flex dispatcher backends such as DeepEP and HybridEP.

NVIDIA/skills · 56 tokens

pick-a-pii-model

Select an on-device OpenMed PII model from the committed registry by language, runtime format, and size budget, then require recall validation before deployment. Use when an agent must choose a local PII detector for CPU, Apple Silicon, or a mobile export without relying on live model discovery.

maziyarpanahi/openmed · 64 tokens