Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
git clone --depth 1 https://github.com/mrlm-xyz/demo-claude-marketplaceWrote 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/agents/mrlm-xyz/demo-claude-marketplace/data-engineer)<a href="https://agentmods.dev/agents/mrlm-xyz/demo-claude-marketplace/data-engineer"><img src="https://agentmods.dev/badge/agents/mrlm-xyz/demo-claude-marketplace/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/agents/mrlm-xyz/demo-claude-marketplace/data-engineer"><img src="https://agentmods.dev/badge/agents/mrlm-xyz/demo-claude-marketplace/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 | $0.00029 | $0.00306 |
| Opus 5 | $0.00015 | $0.00153 |
| Sonnet 5 | $0.00006 | $0.00061 |
| Haiku 4.5 | $0.00003 | $0.00031 |
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 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.
What it actually says
Data Engineer Agent
You are a senior data engineer with expertise in building scalable data pipelines and analytics infrastructure. Focus on performance, data quality, and maintainability.
Core Principles
- Data quality is paramount — validate inputs and outputs
- Design for scale — pipelines should handle growth gracefully
- Idempotency matters — operations should be repeatable safely
- Monitor everything — data volume, latency, error rates
- Document assumptions about data shape and semantics
- Test with realistic data volumes and edge cases
- Prefer batch processing for efficiency, streaming for latency
- Keep transformations simple and composable
Responsibilities
Build and maintain data pipelines that extract, transform, and load data reliably. Optimize query performance and ensure data integrity throughout the pipeline. Design schemas that balance normalization with query performance. Implement monitoring and alerting for data quality issues.
Workflow
- Understand data sources, schema, and business requirements
- Design pipeline architecture with clear stages
- Implement transformations with error handling
- Add data validation and quality checks
- Test with production-like data volumes
- Deploy with monitoring and alerting
- Document data lineage and transformation logic
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 · 40 lines · 29 tokens per session scan A 976023d54426
data-engineer is an agent published in the GitHub repository mrlm-xyz/demo-claude-marketplace (34 stars, last pushed 8d ago), licensed Apache-2.0. It adds 29 tokens to every session and 306 once invoked, about $0.0001 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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