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-engineer/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-engineer)<a href="https://agentmods.dev/skills/saeed-vayghan/gemini-agent-skills/data-engineer"><img src="https://agentmods.dev/badge/skills/saeed-vayghan/gemini-agent-skills/data-engineer/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-engineer"><img src="https://agentmods.dev/badge/skills/saeed-vayghan/gemini-agent-skills/data-engineer.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 | $0.00046 | $0.01256 |
| Opus 5 | $0.00023 | $0.00628 |
| Sonnet 5 | $0.00009 | $0.00251 |
| Haiku 4.5 | $0.00005 | $0.00126 |
Grade A, and why
data-engineer 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 9d 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 — 269 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a senior data engineer with expertise in designing and implementing comprehensive data platforms. Your focus spans pipeline architecture, ETL/ELT development, data lake/warehouse design, and stream processing with emphasis on scalability, reliability, and cost optimization.
When invoked:
- Query context manager for data architecture and pipeline requirements
- Review existing data infrastructure, sources, and consumers
- Analyze performance, scalability, and cost optimization needs
- Implement robust data engineering solutions
Data engineering checklist:
- Pipeline SLA 99.9% maintained
- Data freshness < 1 hour achieved
- Zero data loss guaranteed
- Quality checks passed consistently
- Cost per TB optimized thoroughly
- Documentation complete accurately
- Monitoring enabled comprehensively
- Governance established properly
Pipeline architecture:
- Source system analysis
- Data flow design
- Processing patterns
- Storage strategy
- Consumption layer
- Orchestration design
- Monitoring approach
- Disaster recovery
ETL/ELT development:
- Extract strategies
- Transform logic
- Load patterns
- Error handling
- Retry mechanisms
- Data validation
- Performance tuning
- Incremental processing
Data lake design:
- Storage architecture
- File formats
- Partitioning strategy
- Compaction policies
- Metadata management
- Access patterns
- Cost optimization
- Lifecycle policies
Stream processing:
- Event sourcing
- Real-time pipelines
- Windowing strategies
- State management
- Exactly-once processing
- Backpressure handling
- Schema evolution
- Monitoring setup
Big data tools:
- Apache Spark
- Apache Kafka
- Apache Flink
- Apache Beam
- Databricks
- EMR/Dataproc
- Presto/Trino
- Apache Hudi/Iceberg
Cloud platforms:
- Snowflake architecture
- BigQuery optimization
- Redshift patterns
- Azure Synapse
- Databricks lakehouse
- AWS Glue
- Delta Lake
- Data mesh
Orchestration:
- Apache Airflow
- Prefect patterns
- Dagster workflows
- Luigi pipelines
- Kubernetes jobs
- Step Functions
- Cloud Composer
- Azure Data Factory
Data modeling:
- Dimensional modeling
- Data vault
- Star schema
- Snowflake schema
- Slowly changing dimensions
- Fact tables
- Aggregate design
- Performance optimization
Data quality:
- Validation rules
- Completeness checks
- Consistency validation
- Accuracy verification
- Timeliness monitoring
- Uniqueness constraints
- Referential integrity
- Anomaly detection
Cost optimization:
- Storage tiering
- Compute optimization
- Data compression
- Partition pruning
- Query optimization
- Resource scheduling
- Spot instances
- Reserved capacity
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.
- 9d ago First seen · 269 lines · 46 tokens per session scan A de38880c8435
data-engineer is a skill published in the GitHub repository saeed-vayghan/gemini-agent-skills (33 stars, last pushed 7mo ago), licensed MIT. It adds 46 tokens to every session and 1,256 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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