zenml: Skill for Claude Code

.claude/skills/field-descriptions/SKILL.md

field-descriptions is a skill for Claude Code from zenml-io/zenml. It costs 70 tokens per session (523 once invoked), scanned A, original, Apache-2.0.

Guidance for writing descriptions on Pydantic configuration fields used by ZenML integrations. Pydantic is a Python library that validates structured settings, while ZenML is a framework for machine-learning pipelines.

In plain words
What is it for?
Use it when adding, changing, or reviewing Field(description=...) text in ZenML stack component configuration classes.
Why use it?
It makes configuration fields easier to understand and helps descriptions meet the project's required format, examples, and validation checks.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

This is zenml-io/zenml's own configuration. It tells Claude Code how to work on zenml itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything zenml configures →

About the project

ZenML is a Python framework for turning machine-learning and AI workflows into tracked pipelines that run on different infrastructure backends. It is for ML and AI engineers building applications such as model-training workflows, language-model systems, and agent loops in company environments.

zenml-io/zenml · 5,578 stars · on GitHub · zenml.io

Reuse

Borrowing it

Nothing to install: this file belongs to zenml-io/zenml. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/zenml-io/zenml/main/.claude/skills/field-descriptions/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/zenml-io/zenml

Made for: Claude Code.

Wrote 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.

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README.md
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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.

agentmods 80×15 button for field-descriptions

Your own site · 80×15
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Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 523 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00070 $0.00523
Opus 5 $0.00035 $0.00262
Sonnet 5 $0.00014 $0.00105
Haiku 4.5 $0.00007 $0.00052

Measured 9d ago against content hash 84a8f6a61e0e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

field-descriptions 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.

.claude/skills/field-descriptions/SKILL.md · 63 lines

What it actually says

Field Description Standards

When adding or modifying Field descriptions in stack component configs:

Template Structure

{Purpose statement}. {Valid values/format}. {Example(s)}. {Additional context if needed}.

Core Requirements

  1. Purpose: Clearly state what the field controls or does
  2. Format: Specify expected value format (URL, path, enum, etc.)
  3. Examples: Provide at least one concrete example
  4. Constraints: Include any limitations or requirements

Quality Standards

  • Minimum 30 characters
  • Use action words (controls, configures, specifies, determines)
  • Include concrete examples with realistic values
  • Avoid vague language ("thing", "stuff", "value", "setting")
  • Don't start with "The" or end with periods
  • Be specific about valid formats and constraints

Example Field Descriptions

# Good examples:
instance_type: Optional[str] = Field(
    None,
    description="AWS EC2 instance type for step execution. Must be a valid "
    "SageMaker-supported instance type. Examples: 'ml.t3.medium' (2 vCPU, 4GB RAM), "
    "'ml.m5.xlarge' (4 vCPU, 16GB RAM). Defaults to ml.m5.xlarge for training steps"
)

path: str = Field(
    description="Root path for artifact storage. Must be a valid URI supported by the "
    "artifact store implementation. Examples: 's3://my-bucket/artifacts', "
    "'/local/storage/path', 'gs://bucket-name/zenml-artifacts'. Path must be accessible "
    "with configured credentials"
)

synchronous: bool = Field(
    True,
    description="Controls whether pipeline execution blocks the client. If True, "
    "the client waits until all steps complete. If False, returns immediately and "
    "executes asynchronously. Useful for long-running production pipelines"
)

Validation

  • Run python scripts/validate_descriptions.py to check description quality
  • All descriptions must pass validation before merging
  • Add validation to CI pipeline to prevent regressions
Changes

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.

  1. 9d ago First seen · 63 lines · 70 tokens per session scan A 84a8f6a61e0e

Subscribe to this mod's changes

field-descriptions is a skill published in the GitHub repository zenml-io/zenml (5,578 stars, last pushed yesterday), licensed Apache-2.0. It adds 70 tokens to every session and 523 once invoked, about $0.0003 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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