Emdb Database
jaechang-hits/SciAgent-Skills
Look up EMDB cryo-EM density maps and fitted atomic models via the entry REST API + EBI Search WS.
Query the Crossref REST API for DOI validation, title search, citation metadata, and bibliography audits.
Install Crossref Lookup
$ npx skills add BioTender-max/awesome-bio-agent-skills --skill crossref-lookup -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install BioTender-max/awesome-bio-agent-skills crossref-lookup --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/BioTender-max/awesome-bio-agent-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/omics/crossref-lookup .claude/skills/crossref-lookup && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "crossref-lookup" agent skill from https://github.com/BioTender-max/awesome-bio-agent-skills/tree/main/skills/omics/crossref-lookup into .claude/skills/crossref-lookup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crossref-lookup", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/BioTender-max/awesome-bio-agent-skills/tree/main/skills/omics/crossref-lookupType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add BioTender-max/awesome-bio-agent-skills --skill crossref-lookup -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install BioTender-max/awesome-bio-agent-skills crossref-lookup --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BioTender-max/awesome-bio-agent-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/omics/crossref-lookup .agents/skills/crossref-lookup && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "crossref-lookup" agent skill from https://github.com/BioTender-max/awesome-bio-agent-skills/tree/main/skills/omics/crossref-lookup into .agents/skills/crossref-lookup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crossref-lookup", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add BioTender-max/awesome-bio-agent-skills --skill crossref-lookup -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install BioTender-max/awesome-bio-agent-skills crossref-lookup --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BioTender-max/awesome-bio-agent-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/omics/crossref-lookup .cursor/skills/crossref-lookup && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "crossref-lookup" agent skill from https://github.com/BioTender-max/awesome-bio-agent-skills/tree/main/skills/omics/crossref-lookup into .cursor/skills/crossref-lookup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crossref-lookup", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/BioTender-max/awesome-bio-agent-skills.git --path skills/omics/crossref-lookup--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add BioTender-max/awesome-bio-agent-skills --skill crossref-lookup -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install BioTender-max/awesome-bio-agent-skills crossref-lookup --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BioTender-max/awesome-bio-agent-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/omics/crossref-lookup .gemini/skills/crossref-lookup && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "crossref-lookup" agent skill from https://github.com/BioTender-max/awesome-bio-agent-skills/tree/main/skills/omics/crossref-lookup into .gemini/skills/crossref-lookup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crossref-lookup", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install BioTender-max/awesome-bio-agent-skills crossref-lookupInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add BioTender-max/awesome-bio-agent-skills --skill crossref-lookup -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/BioTender-max/awesome-bio-agent-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/omics/crossref-lookup .github/skills/crossref-lookup && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "crossref-lookup" agent skill from https://github.com/BioTender-max/awesome-bio-agent-skills/tree/main/skills/omics/crossref-lookup into .github/skills/crossref-lookup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crossref-lookup", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add BioTender-max/awesome-bio-agent-skills --skill crossref-lookup -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install BioTender-max/awesome-bio-agent-skills crossref-lookup --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BioTender-max/awesome-bio-agent-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/omics/crossref-lookup .opencode/skills/crossref-lookup && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "crossref-lookup" agent skill from https://github.com/BioTender-max/awesome-bio-agent-skills/tree/main/skills/omics/crossref-lookup into .opencode/skills/crossref-lookup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crossref-lookup", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
crossref-lookup- GitHub stars
- 197
- Token cost
- ~1.1k tokens
- SKILL.md length
- 476 words
- Files
- 3 (incl. scripts)
- Skills in repo
- 18
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Query the Crossref REST API for DOI validation, title search, citation metadata, and bibliography audits.
- Works in 7 steps: Prefer this skill when the user needs… → Use the bundled CLI → Choose the narrowest mode that matches… → …
- You need DOI lookup
- SKILL.md covers Instructions, Quick Reference, Input Requirements and Output, plus 4 more sections
- Reaches doi.org
What it does
Crossref Lookup is an agent skill from BioTender-max/awesome-bio-agent-skills. Query the Crossref REST API for DOI validation, title search, citation metadata, and bibliography audits. Use when you need DOI lookup, title-to-DOI matching, or reference metadata cleanup.
Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including scripts (for example `agents/openai.yaml`).
It sits in Research & Science, covering Citation management and REST APIs. The repository describes itself as: A curated collection of AI agent skills for biomedical research, covering genomics, proteomics, single-cell analysis, clinical AI, and protein design.
When your agent uses it
- You need DOI lookup
- Title-to-DOI matching
- Reference metadata cleanup
Example prompts
- “/crossref-lookup”
Requirements
- Python 3
Workflow steps
7 steps, taken from the first numbered list in SKILL.md.
- Prefer this skill when the user needs DOI validation, title search, citation metadata, or bibliography auditing.
- Use the bundled CLI
- Choose the narrowest mode that matches the request
- Normalize DOI strings before interpreting failures.
- If the user has a contact email for polite-pool requests, pass it with --email.
- Treat Crossref as citation metadata, not full text.
- When title search returns multiple plausible records, keep the ambiguity explicit instead of selecting a match silently.
What it can do on your machine
Read from SKILL.md and the folder at commit 8cbdd18. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/, which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
doi.org
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Crossref Lookup loads about 1.1k tokens when it runs. Until then it costs about 51 tokens; SKILL.md has 476 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 476 words (~1,108 tokens).
“Use this skill for citation metadata work backed by the Crossref REST API.”
- name
- crossref-lookup
Files
SKILL.md and 2 other files (scripts) in skills/omics/crossref-lookup of BioTender-max/awesome-bio-agent-skills.
- SKILL.md
- agents/openai.yaml
- scripts/lookup
Open the folder on GitHubat commit 8cbdd18
Compare with similar skills
Crossref Lookup next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Crossref Lookup this skillBioTender-max/awesome-bio-agent-skills | 197 | — | ~1.1k | Automated safety check: Pass | Custom licence | |
| Emdb Databasejaechang-hits/SciAgent-Skills | 370 | 1 repos | ~4.9k | Automated safety check: Pass | CC-BY-4.0 | |
| Content Research Writerweapp-tailwindcss/weapp-tailwindcss | 1.9k | 25 repos | ~3.5k | Automated safety check: Pass | MIT | |
| NetworkxzLanqing/codex-claude-academic-skills | 4.6k | 16 repos | ~3.2k | Automated safety check: Pass | BSD-3-Clause | |
| Citation Verification GuideGalaxy-Dawn/claude-scholar | 5.7k | 3 repos | ~1.9k | Automated safety check: Pass | MIT | |
| Systematic Review ScreenerImbad0202/academic-research-skills | 51k | — | ~8.4k | Automated safety check: Pass | Custom licence |
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Citation Verification Guide
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Reference guidance for checking every citation in academic writing against canonical sources such as DOI, arXiv, CrossRef and Semantic Scholar, to catch fake or wrong references.
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Related
Categories
Questions about Crossref Lookup
What does Crossref Lookup do?
Query the Crossref REST API for DOI validation, title search, citation metadata, and bibliography audits. Crossref Lookup is an agent skill from BioTender-max/awesome-bio-agent-skills. Query the Crossref REST API for DOI validation, title search, citation metadata, and bibliography audits.
When should I use Crossref Lookup?
Crossref Lookup fits situations like: you need DOI lookup; title-to-DOI matching; reference metadata cleanup.
How do I install Crossref Lookup in Claude Code?
Run `npx skills add BioTender-max/awesome-bio-agent-skills --skill crossref-lookup -a claude-code`. Or copy the skill folder (skills/omics/crossref-lookup in BioTender-max/awesome-bio-agent-skills) into .claude/skills/crossref-lookup in your project. Claude Code loads it when a task matches its description.
How do I install Crossref Lookup in Codex?
Run `npx skills add BioTender-max/awesome-bio-agent-skills --skill crossref-lookup -a codex`. Or copy the skill folder (skills/omics/crossref-lookup in BioTender-max/awesome-bio-agent-skills) into .agents/skills/crossref-lookup in your project. Codex loads it when a task matches its description.
Can I use Crossref Lookup in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add BioTender-max/awesome-bio-agent-skills --skill crossref-lookup -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/crossref-lookup, .gemini/skills/crossref-lookup, .github/skills/crossref-lookup and .opencode/skills/crossref-lookup in your project.
What does Crossref Lookup need to run?
SKILL.md names no scripts, command-line tools or credentials: Crossref Lookup is instructions for the agent only. Our summary lists: Python 3.
Does Crossref Lookup access the network?
SKILL.md names 1 domain. In commands or code: doi.org; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.
Is Crossref Lookup safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Crossref Lookup use?
Crossref Lookup has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Crossref Lookup use?
About 1.1k tokens (SKILL.md is roughly 4.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Crossref Lookup?
Skills that share tags, products or a category with Crossref Lookup: Emdb Database (jaechang-hits/SciAgent-Skills, 370 stars), Content Research Writer (weapp-tailwindcss/weapp-tailwindcss, 1.9k stars), Networkx (zLanqing/codex-claude-academic-skills, 4.6k stars) and Citation Verification Guide (Galaxy-Dawn/claude-scholar, 5.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Crossref Lookup?
BioTender-max (a GitHub user) maintains it in BioTender-max/awesome-bio-agent-skills, which has 197 GitHub stars. The repository holds 18 skills in this directory. The repository was last updated on July 1, 2026.
Source: BioTender-max/awesome-bio-agent-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.