Plugin Official

clangd LSP

C/C++ language server for Claude Code: code intelligence and diagnostics for .c files.

Author: Anthropic
Works with: Claude Code
License: Apache-2.0
Documented: Oct 2, 2026

What clangd LSP is

clangd-lsp connects the C/C++ language server to Claude Code, giving it code intelligence and diagnostics for c, .h, .cpp, .cc, .cxx, .hpp, .hxx, .C, .H files. The plugin only wires up the server; the server binary must be installed separately.

What it does

Where clangd LSP runs and what it adds, from its documentation

Registers the clangd language server (command: clangd --background-index) via the marketplace lspServers entry
Maps file extensions to the language: .c, ..h, ..cpp, ..cc, ..cxx, ..hpp, ..hxx, ..C, ..H
Gives Claude Code code intelligence and diagnostics for C/C++ projects

When to use it

Good fit

Working in a C/C++ codebase where Claude Code should use real language-server analysis
Wanting diagnostics and navigation from clangd without leaving Claude Code

Not for

Projects in other languages (it only maps the extensions listed)
Setups where you cannot install the clangd binary on PATH

How to install clangd LSP

You need: Claude Code; clangd binary on PATH

Install the language server binary first (the plugin does not bundle it):
macOS: brew install llvm, then add /opt/homebrew/opt/llvm/bin to PATH
Ubuntu/Debian: sudo apt install clangd (Fedora: sudo dnf install clang-tools-extra; Arch: sudo pacman -S clang)
Windows: winget install LLVM.LLVM or download from LLVM releases
Install the plugin: /plugin install clangd-lsp@claude-plugins-official

Permissions and security

What it can access

Launches the clangd process locally and reads the project files it analyzes

Security notes from the maintainers

Marketplace README: make sure you trust a plugin before installing, updating, or using it

Review the source before granting an agent access to credentials or production systems. We document what the maintainers state; we do not audit code.

Limitations

Requires the language server to be installed separately; the plugin does not install it

Tools it extends

Coding

Claude Code

Web · Desktop

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Anthropic's agentic coding tool that reads your codebase, edits files and runs commands from the terminal, IDEs, desktop app or browser.

Watch out: Not included in the Free Claude plan, and usage on subscriptions is capped by plan limits.

Listed Not yet reviewed

Verified Sep 29, 2026 code.claude.com (opens Claude Code website in a new tab)

From $20/mo US · checked Sep 29

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Frequently asked questions

How do I install the clangd-lsp plugin for Claude Code?

Install the language server first, then run /plugin install clangd-lsp@claude-plugins-official. source

Which file extensions does the clangd-lsp plugin support?

.c, ..h, ..cpp, ..cc, ..cxx, ..hpp, ..hxx, ..C, ..H. source

Does the clangd-lsp plugin install clangd for me?

No. The README lists install commands for the server itself; the plugin only registers it with Claude Code. source

Related guides

Claude Code plugins and marketplace: 40 profiled in 2026

Sources and gaps

https://raw.githubusercontent.com/anthropics/claude-plugins-official/main/plugins/clangd-lsp/README.md readme, checked Oct 2, 2026
https://raw.githubusercontent.com/anthropics/claude-plugins-official/main/.claude-plugin/marketplace.json registry, checked Oct 2, 2026
https://raw.githubusercontent.com/anthropics/claude-plugins-official/main/README.md readme, checked Oct 2, 2026
https://clangd.llvm.org/ docs, checked Oct 2, 2026

Not stated by the maintainers: last_release not visible.