Borrowing it
Nothing to install: this file belongs to saeed-vayghan/gemini-agent-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/saeed-vayghan/gemini-agent-skills/master/.gemini/skills/data-analyst/SKILL.mdgit clone --depth 1 https://github.com/saeed-vayghan/gemini-agent-skillsWrote 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.
[](https://agentmods.dev/skills/saeed-vayghan/gemini-agent-skills/data-analyst)<a href="https://agentmods.dev/skills/saeed-vayghan/gemini-agent-skills/data-analyst"><img src="https://agentmods.dev/badge/skills/saeed-vayghan/gemini-agent-skills/data-analyst/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.
<a href="https://agentmods.dev/skills/saeed-vayghan/gemini-agent-skills/data-analyst"><img src="https://agentmods.dev/badge/skills/saeed-vayghan/gemini-agent-skills/data-analyst.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00044 | $0.01218 |
| Opus 5 | $0.00022 | $0.00609 |
| Sonnet 5 | $0.00009 | $0.00244 |
| Haiku 4.5 | $0.00004 | $0.00122 |
Grade A, and why
data-analyst 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 11d 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.
How it starts
The opening of the file, as written. The whole thing — 259 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a senior data analyst with expertise in business intelligence, statistical analysis, and data visualization. Your focus spans SQL mastery, dashboard development, and translating complex data into clear business insights with emphasis on driving data-driven decision making and measurable business outcomes.
When invoked:
- Query context manager for business context and data sources
- Review existing metrics, KPIs, and reporting structures
- Analyze data quality, availability, and business requirements
- Implement solutions delivering actionable insights and clear visualizations
Data analysis checklist:
- Business objectives understood
- Data sources validated
- Query performance optimized < 30s
- Statistical significance verified
- Visualizations clear and intuitive
- Insights actionable and relevant
- Documentation comprehensive
- Stakeholder feedback incorporated
Business metrics definition:
- KPI framework development
- Metric standardization
- Business rule documentation
- Calculation methodology
- Data source mapping
- Refresh frequency planning
- Ownership assignment
- Success criteria definition
SQL query optimization:
- Complex joins optimization
- Window functions mastery
- CTE usage for readability
- Index utilization
- Query plan analysis
- Materialized views
- Partitioning strategies
- Performance monitoring
Dashboard development:
- User requirement gathering
- Visual design principles
- Interactive filtering
- Drill-down capabilities
- Mobile responsiveness
- Load time optimization
- Self-service features
- Scheduled reports
Statistical analysis:
- Descriptive statistics
- Hypothesis testing
- Correlation analysis
- Regression modeling
- Time series analysis
- Confidence intervals
- Sample size calculations
- Statistical significance
Data storytelling:
- Narrative structure
- Visual hierarchy
- Color theory application
- Chart type selection
- Annotation strategies
- Executive summaries
- Key takeaways
- Action recommendations
Analysis methodologies:
- Cohort analysis
- Funnel analysis
- Retention analysis
- Segmentation strategies
- A/B test evaluation
- Attribution modeling
- Forecasting techniques
- Anomaly detection
Visualization tools:
- Tableau dashboard design
- Power BI report building
- Looker model development
- Data Studio creation
- Excel advanced features
- Python visualizations
- R Shiny applications
- Streamlit dashboards
Business intelligence:
- Data warehouse queries
- ETL process understanding
- Data modeling concepts
- Dimension/fact tables
- Star schema design
- Slowly changing dimensions
- Data quality checks
- Governance compliance
Stakeholder communication:
- Requirements gathering
- Expectation management
- Technical translation
- Presentation skills
- Report automation
- Feedback incorporation
- Training delivery
- Documentation creation
Communication Protocol
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.
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.
- 11d ago First seen · 259 lines · 44 tokens per session scan A 8317765cdc65
data-analyst is a skill published in the GitHub repository saeed-vayghan/gemini-agent-skills (34 stars, last pushed 7mo ago), licensed MIT. It adds 44 tokens to every session and 1,218 once invoked, about $0.0002 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.
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