yaml-lsp

yaml-lsp is a plugin for Claude Code from zircote/yaml-lsp. Its manifest loads nothing; the 1 command it bundles cost 8 tokens per session together, scanned A, original, MIT.

A YAML language-server plugin for Claude Code that connects to yaml-language-server, a tool that understands YAML files while you edit them.

In plain words
What is it for?
Use it when editing YAML or YML files in Claude Code, especially when you want automated checks and formatting.
Why use it?
It helps catch YAML mistakes and keep formatting consistent through validation and formatting hooks.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest. Also seen: mentions Claude Code.

Good fit Use it when editing YAML or YML files in Claude Code, especially when you want automated checks and formatting.

Compare 6 plugins from other repositories ↓
Install in Claude Code
/plugin marketplace add zircote/yaml-lsp
/plugin install yaml-lsp
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.

Clone the repo
git clone --depth 1 https://github.com/zircote/yaml-lsp

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 yaml-lsp

README.md
[![agentmods](https://agentmods.dev/badge/plugins/zircote/yaml-lsp/yaml-lsp/github.svg)](https://agentmods.dev/plugins/zircote/yaml-lsp/yaml-lsp)
Your own site
<a href="https://agentmods.dev/plugins/zircote/yaml-lsp/yaml-lsp"><img src="https://agentmods.dev/badge/plugins/zircote/yaml-lsp/yaml-lsp/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 yaml-lsp

Your own site · 80×15
<a href="https://agentmods.dev/plugins/zircote/yaml-lsp/yaml-lsp"><img src="https://agentmods.dev/badge/plugins/zircote/yaml-lsp/yaml-lsp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured The manifest loads nothing itself; its 1 command cost 8 tokens a session between them.
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.
Security

Grade A, and why

yaml-lsp 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-plugin/plugin.json · 22 lines

What it actually says

{
  "name": "yaml-lsp",
  "version": "0.1.2",
  "description": "YAML language server plugin for Claude Code with yaml-language-server integration and automated hooks for validation and formatting",
  "author": {
    "name": "zircote",
    "email": "[email protected]"
  },
  "repository": "https://github.com/zircote/yaml-lsp",
  "license": "MIT",
  "keywords": [
    "yaml",
    "yml",
    "lsp",
    "language-server",
    "claude-plugin",
    "code-assistant",
    "yamllint",
    "prettier"
  ]
}
Contents

What it installs

The manifest is a name and a version. 1 command travel with it, and installing the plugin installs all of them — 8 tokens a session between them. Each is measured on its own page, and each can be installed alone.

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 · 22 lines scan A 0278cc748697

Subscribe to this mod's changes

yaml-lsp is a plugin published in the GitHub repository zircote/yaml-lsp (3 stars, last pushed 2mo ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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.

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