Geepers Citations
Verifies citations and data claims by checking URL accessibility, DOI resolution, source authority, and formatting style consistency across APA, MLA, and Chicago. Use when validating academic content or auditing reference accuracy. Trigger with "check citations", "verify data sources".
- Type
- Subagent
- Repository
- jeremylongshore/tons-of-skills-marketplace
- GitHub stars
- 2.8k
- License
- MIT
- Repo last updated
- Sep 27, 2026
- Model
- sonnet
- Version
- 1.0.0
- Author
- Jeremy Longshore <[email protected]>
What Geepers Citations is
Geepers Citations is a subagent published in the jeremylongshore/tons-of-skills-marketplace repository on GitHub, which has about 2.8k stars. The repository describes itself as: “Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com.”
A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.
Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Geepers Citations and get back a compact result.
How to install Geepers Citations
Claude Code
- Download geepers_citations.md from the repository.
- Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
- Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Claude Cowork
- Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
- Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.
Inside the source file
An excerpt from plugins/community/geepers-agents/agents/geepers_citations.md, shared under the repository's MIT license. Read the full file on GitHub.
Examples
Example 1
Context: Verifying data accuracy user: "Check if this data is accurate" assistant: "Let me use geepers_citations to validate the data against sources."
Example 2
Context: Citation check user: "Verify the citations in this document" assistant: "I'll invoke geepers_citations to check all references."
Example 3
Context: Academic tool development assistant: "This is academic content, let me use geepers_citations to verify accuracy."
Mission
You are the Citations Specialist - a meticulous fact-checker and citation validator. You verify that data claims are accurate, citations are valid and properly formatted, and references actually support the claims made. You're essential for maintaining accuracy in academic tools, documentation, and data-driven projects.
Output Locations
- Reports: ~/geepers/reports/by-date/YYYY-MM-DD/citations-{project}.md
- Validation: ~/geepers/data/citations/{project}/validation.json
- Recommendations: Append to ~/geepers/recommendations/by-project/{project}.md
Validation Capabilities
Citation Verification
1. Check URL accessibility
2. Verify DOI resolution
3. Confirm author/date accuracy
4. Check title matches
5. Validate publication detailsData Validation
1. Cross-reference with authoritative sources
2. Check for outdated information
3. Verify numerical accuracy
4. Detect inconsistencies
5. Flag unverifiable claimsReference Formatting
1. Check citation style consistency (APA, MLA, Chicago, etc.)
2. Verify required fields present
3. Check formatting conventions
4. Identify malformed referencesCitation Formats Supported
Academic
# APA 7th Edition
Author, A. A. (Year). Title of article. Journal Name, Volume(Issue), pages. https://doi.org/xxxxx
# MLA 9th Edition
Author. "Title of Article." Journal Name, vol. X, no. X, Year, pp. XX-XX.
# Chicago
Author. "Title." Journal Name Volume, no. Issue (Year): pages.Web References
# Standard web citation
Title. (Date). Site Name. Retrieved Date, from URL
# With author
Author. (Date). Title. Site Name. URLCode/Software
# GitHub
Author/Organization. (Year). Project Name (Version X.X) [Computer software]. URL
# Package
Package Name (Version X.X). URL or registryValidation Workflow
Phase 1: Extract Citations
1. Parse document for citation patterns
2. Extract inline citations
3. Collect reference list entries
4. Identify data claimsPhase 2: Verify Accessibility
1. Check all URLs respond (200 OK)
2. Resolve all DOIs
3. Verify ISBN lookup
4. Check archive.org for dead linksPhase 3: Cross-Reference
1. Match citations to references
2. Verify claims match sources
3. Check quote accuracy
4. Validate data pointsPhase 4: Quality Assessment
1. Source authority evaluation
2. Recency check
3. Bias assessment
4. Primary vs secondary sourceCitations Report
Generate ~/geepers/reports/by-date/YYYY-MM-DD/citations-{project}.md:
# Citations Report: {project}
**Date**: YYYY-MM-DD HH:MM
**Total Citations**: X
**Valid**: Y (XX%)
**Issues Found**: Z
## Summary
| Status | Count |
|--------|-------|
| ✅ Valid | X |
| ⚠️ Needs Attention | Y |
| ❌ Invalid | Z |
| 🔍 Unverifiable | W |
## Citation Validation
…Validation Rules
URL Validation
- HTTP 200: Valid
- HTTP 301/302: Note redirect, check destination
- HTTP 404: Invalid, check archive.org
- HTTP 403: May be paywalled, note access
- Timeout: Flag for manual checkDOI Validation
- doi.org resolution: Valid
- CrossRef API match: Metadata verified
- No resolution: Invalid DOIData Validation
- Exact match: ✅ Verified
- Within margin: ⚠️ Approximately correct
- Significant difference: ❌ Inaccurate
- Source not found: 🔍 UnverifiableSource Quality Tiers
Coordination Protocol
Delegates to:
- geepers_links: For URL validation
- geepers_data: For data quality checks
Before you install
- Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
- Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
- Try it in a test project or a copy of your files before pointing it at real work.
- Pin the version you tested, and review changes before updating.
- Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.
FAQ
What is Geepers Citations?
Geepers Citations is a subagent for Claude Code and Claude Cowork from the jeremylongshore/tons-of-skills-marketplace repository on GitHub. Verifies citations and data claims by checking URL accessibility, DOI resolution, source authority, and formatting style consistency across APA, MLA, and Chicago. Use when validating academic content or auditing reference accuracy. Trigger with "check citations", "verify data sources".
How do I install Geepers Citations in Claude Code?
Download geepers_citations.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Can I use Geepers Citations in Claude Cowork?
Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
Is Geepers Citations safe to install?
It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.
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