What is creating-custom-holoviz-skills?

A repository-specific guide for creating new agent skills for the HoloViz data-visualization ecosystem. HoloViz is a group of Python tools for charts, dashboards, and interactive data applications.

Use it when adding or maintaining a skill in the HoloViz skills repository, especially for documenting API pitfalls, conventions, or version changes.

It explains the project’s required folder structure, documentation process, routing rules, versioning, and evaluation steps.

creating-custom-holoviz-skills — Skill for Claude Code by holoviz-dev

Install

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.

Any agent

npx skills add holoviz-dev/holoviz-skills --skill creating-custom-holoviz-skills

Clone the repo

git clone --depth 1 https://github.com/holoviz-dev/holoviz-skills

Made for: Claude Code.

Or install holoviz, the plugin that ships this one along with the rest of its 14 skills.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/holoviz-dev/holoviz-skills/creating-custom-holoviz-skills/github.svg)](https://agentmods.dev/skills/holoviz-dev/holoviz-skills/creating-custom-holoviz-skills)

Your own site

<a href="https://agentmods.dev/skills/holoviz-dev/holoviz-skills/creating-custom-holoviz-skills"><img src="https://agentmods.dev/badge/skills/holoviz-dev/holoviz-skills/creating-custom-holoviz-skills/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/holoviz-dev/holoviz-skills/creating-custom-holoviz-skills"><img src="https://agentmods.dev/badge/skills/holoviz-dev/holoviz-skills/creating-custom-holoviz-skills.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 48 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,355 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.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00048	$0.04355
Opus 5.5	$0.00019	$0.01742
Sonnet 5.5	$0.00010	$0.00871
Haiku 4.5	$0.00005	$0.00436

Measured 16d ago against content hash adaca23c48f7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

creating-custom-holoviz-skills 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 16d 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.

creating-custom-holoviz-skills/SKILL.md · 373 lines

How it starts

The opening of the file, as written. The whole thing — 373 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Creating Custom Skills

Guide for adding a new skill to the holoviz-skills repository. This covers what's specific to this repo — for general skill-authoring advice (drafting, testing, iterating, description optimization), see the skill-creator skill.

Deciding to add a skill
Repo layout
Adding a sub-skill
SKILL.md structure
- Versioning
Resource files
Routing skills
Docs pipeline
Evaluation
Resources

Deciding to add a skill

Add a skill when agents consistently get something wrong about a HoloViz library or workflow and the fix can be expressed as concise, opinionated instructions. Good candidates: API gotchas, deprecated patterns, non-obvious conventions, correct import paths, parameter names that changed between versions. Bad candidates: restating upstream docs, general Python knowledge, anything the model already handles well.

Repo layout

Skills live under one of two category directories, or at the top level for cross-cutting concerns:

developing-with-holoviz/          # Using HoloViz libraries in projects
  SKILL.md                        # Routing skill — dispatches to sub-skills
  skills/
    hvplot/SKILL.md
    panel/SKILL.md
    ...

contributing-to-holoviz/          # Maintaining HoloViz packages
  SKILL.md                        # Routing skill
  skills/
    cleanup/SKILL.md
    testing/SKILL.md
    ...

creating-custom-holoviz-skills/   # This skill (top-level, standalone)
  SKILL.md

Pick the category that fits. If your skill is about using a HoloViz tool, it goes under developing-with-holoviz/skills/. If it's about contributing to a HoloViz package (testing, docs, releases), it goes under contributing-to-holoviz/skills/.

Read the full file on GitHub · 373 lines

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.

16d ago Changed · +23 lines adaca23c48f7
1mo ago Changed · +6 lines c41b878dfa75
2mo ago First seen · 344 lines · 48 tokens per session scan A 82a507024081

Subscribe to this mod's changes

creating-custom-holoviz-skills is a skill published in the GitHub repository holoviz-dev/holoviz-skills (5 stars, last pushed 2d ago), licensed BSD-3-Clause. It adds 48 tokens to every session and 4,355 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-31.

Building agents

creating-custom-holoviz-skills next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
creating-custom-holoviz-skillsholoviz-dev/holoviz-skills	Skill	5	2d ago	BSD-3-Clause	A	48	Claude Code
imagegenopenai/codex	Skill	133k	yesterday	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	yesterday	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	4d ago	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	313k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	103	Claude Code

creating-custom-holoviz-skills