vlist: Agent for Claude Code

.claude/agents/plugin-scaffold.md

feature-scaffold is an agent for Claude Code from floor/vlist. It costs 27 tokens per session (529 once invoked), scanned A, original, MIT.

A scaffolding agent for creating a new vlist feature with the project’s expected source files, exports, configuration types, and test structure.

In plain words
What is it for?
Use it when adding a feature plugin to a TypeScript project, including its implementation, public exports, configuration types, and test skeleton.
Why use it?
It removes the manual work of matching an existing feature architecture and helps catch errors in the initial setup.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter; mentions subagents.

This is floor/vlist's own configuration. It tells Claude Code how to work on vlist 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 vlist configures →

Reuse

Borrowing it

Nothing to install: this file belongs to floor/vlist. 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/floor/vlist/main/.claude/agents/plugin-scaffold.md
Clone the repo
git clone --depth 1 https://github.com/floor/vlist

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.

agentmods badge for feature-scaffold

README.md
[![agentmods](https://agentmods.dev/badge/agents/floor/vlist/plugin-scaffold/github.svg)](https://agentmods.dev/agents/floor/vlist/plugin-scaffold)
Your own site
<a href="https://agentmods.dev/agents/floor/vlist/plugin-scaffold"><img src="https://agentmods.dev/badge/agents/floor/vlist/plugin-scaffold/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.

agentmods 80×15 button for feature-scaffold

Your own site · 80×15
<a href="https://agentmods.dev/agents/floor/vlist/plugin-scaffold"><img src="https://agentmods.dev/badge/agents/floor/vlist/plugin-scaffold.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 27 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 529 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00027 $0.00529
Opus 5.5 $0.00011 $0.00212
Sonnet 5.5 $0.00005 $0.00106
Haiku 4.5 $0.00003 $0.00053

Measured 1mo ago against content hash 98c580566f26, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

feature-scaffold 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 1mo 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/agents/plugin-scaffold.md · 57 lines

What it actually says

Feature Scaffold

You create the complete file structure for a new vlist feature, matching existing conventions exactly. After creating files, you validate the scaffold by spawning sub-agents.

Steps

  1. The user provides a feature name and description.

  2. Read these reference files:

    • src/builder/types.ts — VListFeature, BuilderContext, BuilderConfig interfaces
    • src/features/grid/feature.ts — canonical feature structure
    • src/features/grid/index.ts — barrel export pattern
    • test/plugins/grid/plugin.test.ts — test pattern
    • src/index.ts — how features are exported
  3. Create files:

    • src/features/{name}/feature.ts — implements VListFeature<T>
    • src/features/{name}/index.ts — barrel export
    • src/features/{name}/types.ts — config types (if needed)
    • test/plugins/{name}/plugin.test.ts — test skeleton
  4. Requirements:

    • Export a with{Name} factory function returning VListFeature<T>
    • Unique name string and priority number
    • Implement setup(ctx: BuilderContext<T>), optional destroy()
    • Follow all TypeScript rules (strict, no any, explicit types)
    • Add JSDoc on all public exports
  5. Add the export to src/index.ts.

  6. Flag as manual TODOs: build entry in build.ts, package.json export path, adapter auto-detection.

Validation

After creating all files, spawn these sub-agents in parallel to validate the scaffold:

  • @typecheck — verify the new files compile under strict mode
  • @test-runner — run the new test file to confirm it passes

Report any issues found. If validation fails, fix the files before returning.

Priority guidelines

  • Layout (grid, masonry, table, groups): 10
  • Data (async): 20
  • Interaction (selection): 50
  • UI (scrollbar): 60
  • Transform (scale): 70
  • Mode (page): 80
  • State (snapshots): 90
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. 1mo ago First seen · 57 lines · 27 tokens per session scan A 98c580566f26

Subscribe to this mod's changes

feature-scaffold is an agent published in the GitHub repository floor/vlist (18 stars, last pushed 9d ago), licensed MIT. It adds 27 tokens to every session and 529 once invoked, about $0.0001 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 2026-09-01.

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