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.
npx skills add rudderlabs/rudder-agent-skills --skill rudder-transformationsgit clone --depth 1 https://github.com/rudderlabs/rudder-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/rudderlabs/rudder-agent-skills/rudder-transformations)<a href="https://agentmods.dev/skills/rudderlabs/rudder-agent-skills/rudder-transformations"><img src="https://agentmods.dev/badge/skills/rudderlabs/rudder-agent-skills/rudder-transformations/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/rudderlabs/rudder-agent-skills/rudder-transformations"><img src="https://agentmods.dev/badge/skills/rudderlabs/rudder-agent-skills/rudder-transformations.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00038 | $0.03392 |
| Opus 5 | $0.00019 | $0.01696 |
| Sonnet 5 | $0.00008 | $0.00678 |
| Haiku 4.5 | $0.00004 | $0.00339 |
Grade A, and why
rudder-transformations 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 12d 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 — 391 lines — stays where its author put it; the contents beside it link to each section on GitHub.
RudderStack Transformations with Rudder CLI
Overview
RudderStack transformations allow real-time event manipulation using JavaScript or Python. Libraries provide reusable code shared across transformations. Both are managed as code using YAML specs and the Rudder CLI.
Recommended Workflow
Follow this loop for every change — authoring a new transformation or library, or editing existing code. Testing locally with fixtures is the key step that distinguishes transformations work from other CLI workflows.
digraph transformations_workflow {
rankdir=TB;
"rudder-cli workspace info" [shape=box];
"Authenticated?" [shape=diamond];
"rudder-cli auth login" [shape=box];
"Edit YAML / JS / fixtures" [shape=box];
"rudder-cli validate -l ./" [shape=box];
"Validation errors?" [shape=diamond];
"Fix errors" [shape=box];
"rudder-cli transformations test --all -l ./" [shape=box];
"Tests pass?" [shape=diamond];
"Fix code or expected output" [shape=box];
"rudder-cli apply --dry-run -l ./" [shape=box];
"Diff matches intent?" [shape=diamond];
"Adjust specs" [shape=box];
"rudder-cli apply -l ./" [shape=box];
"Done" [shape=doublecircle];
"rudder-cli workspace info" -> "Authenticated?";
"Authenticated?" -> "rudder-cli auth login" [label="no"];
"rudder-cli auth login" -> "rudder-cli workspace info";
"Authenticated?" -> "Edit YAML / JS / fixtures" [label="yes"];
"Edit YAML / JS / fixtures" -> "rudder-cli validate -l ./";
"rudder-cli validate -l ./" -> "Validation errors?";
"Validation errors?" -> "Fix errors" [label="yes"];
"Fix errors" -> "rudder-cli validate -l ./";
"Validation errors?" -> "rudder-cli transformations test --all -l ./" [label="no"];
"rudder-cli transformations test --all -l ./" -> "Tests pass?";
"Tests pass?" -> "Fix code or expected output" [label="no"];
"Fix code or expected output" -> "rudder-cli validate -l ./";
"Tests pass?" -> "rudder-cli apply --dry-run -l ./" [label="yes"];
"rudder-cli apply --dry-run -l ./" -> "Diff matches intent?";
"Diff matches intent?" -> "Adjust specs" [label="no"];
"Adjust specs" -> "rudder-cli validate -l ./";
"Diff matches intent?" -> "rudder-cli apply -l ./" [label="yes"];
"rudder-cli apply -l ./" -> "Done";
}
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.
- 12d ago First seen · 391 lines · 38 tokens per session scan A 83606e1f3aad
rudder-transformations is a skill published in the GitHub repository rudderlabs/rudder-agent-skills (18 stars, last pushed 7d ago), licensed MIT. It adds 38 tokens to every session and 3,392 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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