Vastlint MCP Server

Website & web validator: VAST tag validator Paste a VAST tag and get results in your browser, no install required.

People who need developer tools tools inside Claude, Cursor, VS Code, or another MCP client. The project is written in Rust.

VERIFIED ACTIVE

LAST COMMIT 2026-08-24 · ★ 17 · #112 OF 139 MAINTAINED DEVELOPER TOOLS · VERIFIED 2026-08-25

NOASSERTION · Rust servers · how we verify → /methodology

01 · Install Vastlint

Claude Code

claude mcp add aleksuix-vastlint --transport sse https://vastlint.org/mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "aleksuix-vastlint": {
      "url": "https://vastlint.org/mcp"
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://vastlint.org/mcp

transport: sse

endpoint alive - responded to MCP initialize · probed 2026-08-25

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as Claude Desktop extension (.mcpb bundle) · remote - your agent's requests go to vastlint.org

endpoint auth accepted our unauthenticated MCP initialize - no credentials needed to connect

license no standard license detected - usage rights unclear; check the repo before commercial use

registry namespace io.github.aleksUIX is GitHub-verified and matches the repo owner

03 · What Vastlint can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v0.13.4 · 2026-08-22

SIMID auto-fix. Catalog stays at 232. vastlint fix now repairs the one-legal-form · SIMID XML defects. javascript: URLs and an existing type MIME stay manual. · Changed · vastlint fix now repairs SIMID near-miss…

v0.13.3 · 2026-08-22

Four SIMID XML leftovers. Catalog 228 to 232. A tag that validated clean on · 0.13.2 can report findings here if apiFramework is a near-miss (simid, · trailing space), the creative URL is HTTP:// / javascript: / file…

v0.13.2 · 2026-08-18

Partner tallies on the gRPC sidecar. No rule changes; the catalog stays at · 228 and any tag that validated on 0.13.1 validates identically here. · Added · vastlint_grpc_verdicts_total{caller,valid} and…

04 · Who maintains Vastlint

VASTlint is maintained by aleksuix. We track 2 MCP servers from aleksuix - 2 actively maintained, 19 combined GitHub stars, oldest repo from Apr 2026. Full record: all servers from aleksuix.

RTBlint Validate OpenRTB bid requests and responses against IAB specs. ARTF, Rust core. ★ 2

05 · Facts

repository: github.com/aleksuix/vastlint
category: developer tools - ranked #112 of 139 actively-maintained developer tools servers as of 2026-08-25.
release cadence: 10+ releases in the last 90 days (latest 2026-08-22)
registry: io.github.aleksUIX/vastlint (active, first published 2026-04-19 · 55 versions)
packages: mcpb:https://github.com/aleksUIX/vastlint/releases/download/v0.13.4/vastlint-mcp-linux-x86_64.tar.gz

06 · Vastlint FAQ

What is Vastlint?

Website & web validator: VAST tag validator Paste a VAST tag and get results in your browser, no install required.

Is Vastlint still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-24 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

How do I install Vastlint?

Run `claude mcp add aleksuix-vastlint --transport sse https://vastlint.org/mcp`. You can also paste the ready-made client config above.

Does Vastlint require authentication?

No - the endpoint accepted our unauthenticated MCP initialize when probed on 2026-08-25; you can connect without credentials.

07 · Alternatives to Vastlint

Alternatives to Vastlint

Maintained developer tools servers if Vastlint isn't the fit.

Pairs well with

Servers that cover what Vastlint doesn't - only shown when the pairing reason fits the companion.

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