Hostsmith MCP server

@hostsmith/mcp-server

Official Model Context Protocol server for the Hostsmith hosting platform.

Static hosting for agents - give it a file, get a live URL. Claude Code shipping an HTML report. Cursor previewing a generated demo. Claude publishing a one-pager from claude.ai or Desktop. One MCP call → public HTTPS URL in seconds. No repo, no CI, no build step. Custom domains, private sites, EU or US data residency.

Why Hostsmith

• Artifact-first. No repo, no build config - drop a file (or have the agent generate one), get a URL.
• Built for agents. MCP-native, OAuth-scoped, structured tool descriptions agents can chain.
• EU or US data residency. Pick where the user's data lives, architecturally - not via a checkbox.

Tools

Tool	Description
list_sites	List all sites in your account for a given data partition
get_site	Get details of a specific site
create_site	Create a new site, or a redirect host
delete_site	Delete a site
list_domains	List available domains (shared and custom)
get_account	Get account info, subscription plan, and usage
deploy_files	Deploy inline file contents to a site
deploy_create_upload	Start a direct upload for binaries / large files
deploy_finalize	Commit a deploy started with deploy_create_upload
list_redirects	List a site's redirect rules, in the order they are checked
set_redirects	Replace a site's user redirect rules, from rules or _redirects text
edit_redirects	Add, update and delete user redirect rules in one batch
add_redirect	Add one user redirect rule
delete_redirect	Delete one user redirect rule
switch_file_redirects	Switch the live deploy's _redirects rules off or back on
test_redirect	Test a path against the live or draft redirect rules

Redirects apply only on your organization's own custom domains. User rules, kept on the hostname and changed through these tools, are checked before the live deploy's _redirects.

To forward a hostname with no content of its own, such as a retired domain or a campaign link, create a redirect host: create_site with kind: "redirect", then add its rules. A redirect host serves only its rules and takes no deploys. It doesn't count toward your plan's site limit; an organization can have up to 50.

Usage

Authentication is via OAuth 2.0. Static access tokens are not supported.

Claude (claude.ai, Desktop, Cowork, mobile)

Add Hostsmith once as a custom connector and it works in every Claude app on your account.

1. In Claude, open Customize > Connectors, click + Add, then Add custom connector.

2. Enter Hostsmith as the name and paste the MCP server URL:

   https://mcp.hostsmith.net/mcp
   

3. Click Continue, finish adding the connector, then connect it. Claude opens Hostsmith in your browser to authorize the connector against your Hostsmith account.

Free Claude plans allow one custom connector. On Team and Enterprise plans, an owner adds the connector under Organization settings > Connectors, and each member then clicks Connect next to Hostsmith under Customize > Connectors to sign in with their own Hostsmith account.

Claude asks for your approval before each tool call. To change that, open Hostsmith under Customize > Connectors and set its Tool permissions.

To revoke, open Hostsmith under Customize > Connectors, click ⋯, then Remove (Team and Enterprise owners: Organization settings > Connectors). To force a re-auth, click Disconnect, then Connect.

Stdio (Claude Code, Cursor, Cline, Windsurf, Zed)

Add this entry to your MCP client's config:

{
  "mcpServers": {
    "hostsmith": {
      "command": "npx",
      "args": ["-y", "@hostsmith/mcp-server"]
    }
  }
}

The first tool call triggers an OAuth flow in your browser to authorize the server against your Hostsmith account.

Remote URL (other clients)

Any MCP client that supports remote Streamable HTTP transport can point directly at the hosted server:

{
  "mcpServers": {
    "hostsmith": {
      "url": "https://mcp.hostsmith.net/mcp"
    }
  }
}

The client handles the OAuth flow automatically - you'll be redirected to Hostsmith to authorize access.

Claude Code can use the hosted server directly too:

claude mcp add --transport http hostsmith https://mcp.hostsmith.net/mcp

Cursor (one-click install)

Click the badge to add the remote Hostsmith server (https://mcp.hostsmith.net/mcp) to Cursor. The first tool call triggers OAuth in your browser.

Local HTTP (self-hosted)

Run the server in HTTP mode and have your MCP client perform OAuth against it:

npx @hostsmith/mcp-server http

{
  "mcpServers": {
    "hostsmith": {
      "url": "http://localhost:3100/mcp"
    }
  }
}

Embedding the HTTP handler

createFetchHandler returns a Web-Standard (req: Request) => Promise<Response> handler, for hosting the server in your own runtime (a Lambda, an edge worker, a Node server). It reads no environment variables; pass the configuration:

import { createFetchHandler } from "@hostsmith/mcp-server";

const handler = createFetchHandler({
  hostsmithUrl: "https://hostsmith.net",
  mcpBaseUrl: "https://mcp.example.com",
  // Optional: called for every authenticated MCP request with that
  // request's new McpServer and the access token's decoded claims,
  // before the server handles the request.
  onServer: async (server, { claims }) => {
    // e.g. attach your own instrumentation to `server`
  },
});

onServer is awaited. If it throws, the error is logged and the request is handled as if there were no hook. The claims are decoded, not verified; the Hostsmith API verifies the token on every tool call. Hostsmith's hosted server at mcp.hostsmith.net uses this hook for its usage analytics. The package itself contains no analytics client and sends no telemetry, and the CLI passes no hook.

Environment variables

Variable	Default	Description
HOSTSMITH_URL	https://hostsmith.net	Hostsmith app URL (OAuth endpoints).
HOSTSMITH_API_DOMAIN	-	Override the upstream API domain across both partitions. The server prepends us.api. and eu.api. to the value you set. Example: HOSTSMITH_API_DOMAIN=staging.example.com routes calls to https://us.api.staging.example.com and https://eu.api.staging.example.com. Use this to point at a staging or proxied API host.
HOSTSMITH_BASE_URL	-	Override the API base URL with a single fixed value, bypassing partition selection entirely.
PORT	3100	HTTP server port.
MCP_BASE_URL	http://localhost:$PORT	Public URL of the MCP server, used in OAuth metadata.

Network access

The MCP transport and OAuth flow run in your client's app process and need no agent-sandbox configuration - if your MCP client connected, those paths are working.

The one place sandboxed agents commonly fail is the upload PUT during deploy_create_upload + deploy_finalize: the bytes go from the agent's shell to the partition API host. From the agent terminal, allow outbound HTTPS (port 443) to:

• us.api.hostsmith.net (for sites in the us partition)
• eu.api.hostsmith.net (for sites in the eu partition)

Sandbox-specific snippets (Cursor sandbox.json, Claude Code settings.json, Codex config.toml, generic firewall guidance) live in the Network access docs.

The server's own calls to the Hostsmith API identify themselves with User-Agent: hostsmith-mcp-server/<version> hostsmith-js-sdk/<version>.

Troubleshooting

• Tool calls return 401: the OAuth session expired. Reconnect from your MCP client to re-authorize.
• OAuth redirect loops: confirm MCP_BASE_URL matches the URL your MCP client uses to reach the server.
• Wrong partition: tool calls accept an explicit partition arg; if you omit it, the partition is inferred from your access token.
• Upload PUT fails (DNS, refused, proxy, timeout): the agent's shell can't reach the partition API host. See Network access.
• Inspect the install: npx @modelcontextprotocol/inspector npx -y @hostsmith/mcp-server http to browse tools interactively.

Documentation

Deeper material lives at hostsmith.net/docs/mcp.

Contributing

See CONTRIBUTING.md (including the Releases section for the version-stamping flow). Security issues: see SECURITY.md.

License

MIT