lsp

Language-server support for inspecting and changing code safely. A language server is a tool that understands a programming language and can report problems, locate definitions and references, and check renames.

In plain words
What is it for?
Use it for diagnostics, symbol and reference searches, jumping to definitions, and checking or applying workspace-wide renames.
Why use it?
It gives the coding agent structured information about the codebase instead of relying only on text searches.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/code-yeongyu/lazycodex/lsp
Any agent
npx skills add code-yeongyu/lazycodex --skill lsp
Clone the repo
git clone --depth 1 https://github.com/code-yeongyu/lazycodex

Made for: Claude Code, Codex.

Per session 27 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 309 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00027 $0.00309
Opus 5 $0.00014 $0.00154
Sonnet 5 $0.00005 $0.00062
Haiku 4.5 $0.00003 $0.00031

Measured yesterday against content hash 3fab0f09a4df, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 yesterday.

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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

  • lsp — 100% identical, 0 lines differ
plugins/omo/components/lsp/skills/lsp/SKILL.md · 36 lines

What it actually says

Codex LSP

Call lsp MCP tools through the tool interface; lsp.*/mcp__lsp__* are tool-call names, not shell commands.

Tools

  • lsp.status: list configured, installed, missing, disabled, and active language servers.
  • lsp.diagnostics: check one file or directory for LSP diagnostics. Prefer severity: "error" after edits.
  • lsp.goto_definition: locate a symbol definition from file, line, and character.
  • lsp.find_references: find usages of a symbol across the workspace.
  • lsp.symbols: inspect document symbols or search workspace symbols.
  • lsp.prepare_rename: check whether a rename is valid at a position.
  • lsp.rename: apply a language-server workspace edit for a rename.

Config

Project config lives at .codex/lsp-client.json; user config lives at ~/.codex/lsp-client.json.

{
	"lsp": {
		"typescript": {
			"command": ["typescript-language-server", "--stdio"],
			"extensions": [".ts", ".tsx", ".js", ".jsx"]
		}
	}
}

Use lsp.status first when diagnostics report a missing language server.

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. yesterday First seen · 36 lines · 27 tokens per session scan A 3fab0f09a4df

Subscribe to this mod's changes

lsp is a skill published in the GitHub repository code-yeongyu/lazycodex (3,350 stars, last pushed 23d ago), licensed MIT. It adds 27 tokens to every session and 309 once invoked, about $0.0001 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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