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<!DOCTYPE html>
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<main class="v-doc">
<h1 class="main">Tools</h1>
<h2 id="v-fmt">v fmt <a href="tools.html#v-fmt" class="header-anchor" aria-hidden="true">#</a></h2>
<p>You don't need to worry about formatting your code or setting style guidelines.
<code>v fmt</code> takes care of that:</p>
<pre><code class="language-shell">v fmt file.v
</code></pre>
<p>It's recommended to set up your editor, so that <code>v fmt -w</code> runs on every save.
A vfmt run is usually pretty cheap (takes <30ms).</p>
<p>Always run <code>v fmt -w file.v</code> before pushing your code.</p>
<p>The formatter checks syntax without requiring the code to pass semantic checks.
For example, it preserves closure captures and loop binder mutability while you edit
incomplete code.</p>
<p>Backend options before <code>fmt</code>, such as <code>v -b arm64 fmt file.v</code>, or in <code>VFLAGS</code> are honored.
The <code>arm64</code> and <code>eval</code> backends use the same source formatting rules as <code>c</code>.</p>
<p>A function, loop, <code>if</code> branch or <code>match</code> branch whose body is a single statement
stays on one line when you write it that way and it fits in 100 columns:</p>
<div class="language-v">struct Point {
x int
y int
}
fn (p Point) sum() int { return p.x + p.y }
fn first_positive(a []int) int {
for x in a { if x > 0 { return x } }
return 0
}
</div>
<p>A comment after a compact <code>match</code> branch's closing brace stays with that branch,
including the final <code>else</code> branch.</p>
<p>During the formatter transition, <code>v fmt -verify</code> and <code>v fmt -c</code> accept
files matching either current or legacy vfmt output. <code>v fmt -w</code> uses current formatting,
so it may rewrite a file accepted by either check mode.</p>
<h3 id="disabling-the-formatting-locally">Disabling the formatting locally <a href="tools.html#disabling-the-formatting-locally" class="header-anchor" aria-hidden="true">#</a></h3>
<p>To disable formatting for a block of code, wrap it with <code>// vfmt off</code> and
<code>// vfmt on</code> comments.</p>
<pre><code class="language-bash">// Not affected by fmt
// vfmt off
... your code here ...
// vfmt on
// Affected by fmt
... your code here ...
</code></pre>
<h2 id="v-mcp">v mcp <a href="tools.html#v-mcp" class="header-anchor" aria-hidden="true">#</a></h2>
<p><code>v mcp</code> runs a <a href="https://modelcontextprotocol.io">Model Context Protocol</a> server
that gives a coding agent the V compiler's own view of a project: what the code
declares, what does not compile, what a symbol refers to, and the bundled skills
that describe the language.</p>
<pre><code class="language-shell">v mcp serve # over stdio, which is what an MCP client launches
v mcp serve --http 127.0.0.1:0 # over Streamable HTTP
v mcp serve --root DIR # resolve relative paths against DIR
v mcp serve --read-only # register no tool that writes a file
v mcp tools # list the tools, with what each one answers
</code></pre>
<p>The server is not a separate index. It calls the V parser, checker and formatter
in process, so it answers correctly about code that does not compile yet. Only the
tools that genuinely compile or run something start the compiler.</p>
<p>The tools fall into groups:</p>