Arda
Fast TCR/BCR FR/CDR region annotation (Antigen Receptor Domain Annotation). Use whenever the user wants to annotate immune-receptor sequences with framework/CDR regions, V/D/J gene calls, constant-region isotype (c_call/c_class), junction/CDR3 boundaries, or AIRR output — for TCR (TRA/TRB/TRG/TRD) or BCR (IGH/IGK/IGL), nucleotide or amino acid, single sequences or large FASTA/FASTQ. Also use for: marking up, validating or REPAIRING a bare (CDR3 amino acid, V, J) record that has no read behind it — a VDJdb-style row — including locating where it disagrees with germline and restoring a missing Cys104 / Phe118 anchor; calling the D gene (and tandem D-D) on a bare junction, or inferring it from junction length when the protein shows none of it; extracting the receptor repertoire (clonotypes, isotype usage) from bulk RNA-seq; getting germline FR1-FR3/CDR1-CDR2 (V) or FR4 (J) subsequences for individual alleles; building or rebuilding the reference database from IMGT germlines via IgBLAST; or diagnosing mmseqs2 setup. arda runs MMseqs2 + a C++ coordinate projection (IgBLAST is offline/build-time only), so it is much faster than IgBLAST at annotation time. Load references/ files for the detailed API, region/junction semantics, reference-build pipeline, or mmseqs install/troubleshooting.
Security AStatic scan found no risk patternsHow grading works ›
From the source SKILL.md
arda annotates the framework (FR1–FR4) and complementarity-determining (CDR1–CDR3) regions of TCR/BCR sequences. The expensive IgBLAST markup is done once, offline, when the reference database is built; at annotation time arda only runs an MMseqs2 search + a C++ routine that projects the reference region coordinates onto each query. That makes it embeddable and ~4–8× faster than IgBLAST, with 98–99.7% region concordance on real GenBank mRNA across all five organisms.
What this skill does
Arda is a community-contributed Claude Code skill in the orchestration-frameworks sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/arda/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use whenever the user wants to annotate immune-receptor sequences with framework/CDR regions, V/D/J gene calls, constant-region isotype (c_call/c_class), junction/CDR3 boundaries, or AIRR output — for TCR (TRA/TRB/TRG/TRD) or BCR (IGH/IGK/IGL), nucleotide or amino acid, single sequences or large FASTA/FASTQ. Also use for: marking up, validating or REPAIRING a bare (CDR3 amino acid, V, J) record that has no read behind it — a VDJdb-style row — including locating where it disagrees with germline and restoring a missing Cys104 / Phe118 anchor; calling the D gene (and tandem D-D) on a bare junction, or inferring it from junction length when the protein shows none of it; extracting the receptor repertoire (clonotypes, isotype usage) from bulk RNA-seq; getting germline FR1-FR3/CDR1-CDR2 (V) or FR4 (J) subsequences for individual alleles; building or rebuilding the reference database from IMGT germlines via IgBLAST; or diagnosing mmseqs2 setup.
Who uses this skill
The Arda Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 150,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
How to install
Free
Manual install (2 steps)
mkdir -p ~/.claude/skills/arda
curl -L https://claudskills.com/skills/arda/SKILL.md \
-o ~/.claude/skills/arda/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/arda/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/arda/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\arda\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Telegram
📱 Install from your phone or desktop Telegram
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
Pro
One-click install via the desktop app
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
Pro
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
Frequently asked questions
How do I install the Arda Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy
SKILL.md from the source repository to
~/.claude/skills/arda/SKILL.md and restart Claude Code. Both flows are detailed at
claudskills.com/install/.
What does the Arda skill do?
Fast TCR/BCR FR/CDR region annotation (Antigen Receptor Domain Annotation). Use whenever the user wants to annotate immune-receptor sequences with framework/CDR regions, V/D/J gene calls, constant-region isotype (c_call/c_class), junction/CDR3 boundaries, or AIRR output — for TCR (TRA/TRB/TRG/TRD) or BCR (IGH/IGK/IGL), nucleotide or amino acid, single sequences or large FASTA/FASTQ. Also use for: marking up, validating or REPAIRING a bare (CDR3 amino acid, V, J) record that has no read behind it — a VDJdb-style row — including locating where it disagrees with germline and restoring a missing Cys104 / Phe118 anchor; calling the D gene (and tandem D-D) on a bare junction, or inferring it from junction length when the protein shows none of it; extracting the receptor repertoire (clonotypes, isotype usage) from bulk RNA-seq; getting germline FR1-FR3/CDR1-CDR2 (V) or FR4 (J) subsequences for individual alleles; building or rebuilding the reference database from IMGT germlines via IgBLAST; or diagnosing mmseqs2 setup. arda runs MMseqs2 + a C++ coordinate projection (IgBLAST is offline/build-time only), so it is much faster than IgBLAST at annotation time. Load references/ files for the detailed API, region/junction semantics, reference-build pipeline, or mmseqs install/troubleshooting.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Arda skill?
Use Arda when your Claude Code task falls under the General category — specifically in the orchestration frameworks area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Arda" or describe the task and let Claude pick). Browse related skills at
/category/general/.
What is a Claude Code skill and how does the Arda skill fit in?
A Claude Code skill is a
SKILL.md file that lives under
~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Arda is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at
/learn/what-is-a-claude-skill/.
Attribution & license
Cite this skill
If you reference this skill in a blog post, paper, or documentation, you can cite it as:
APA
antigenomics. (2026). Arda [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/arda/
BibTeX
@misc{arda-2026,
author = {antigenomics},
title = {Arda [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/arda/}
}Embed this skill
Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →
Badge
[](https://claudskills.com/skills/arda/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)
<script>
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<iframe>
<iframe src="https://claudskills.com/embed/arda.html" width="100%" height="160" frameborder="0" loading="lazy" title="ClaudSkills: Arda"></iframe>
Security scan
Grade A · scanned 2026-07-12 — free static scan against the OWASP Agentic Skills Top 10.
No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›
- ✓ Prompt injection
- ✓ Data exfiltration
- ✓ Supply chain
- ✓ Reverse shell
- ✓ Credentials
- ✓ Execution
- ✓ Filesystem
- ✓ Persistence
- ✓ Obfuscation
- ✓ Network
Show this grade on your repo (click to copy):
[](https://claudskills.com/skills/arda/#security)
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