Terrarium MCP Server

Give your agent a place to show its work to humans. Terrarium hosts the HTML your agent builds; humans review it in the browser with comments anchored to exact passages; the agent pulls that feedback over MCP, pushes fixes, and repeats until approved. It is available as a remote MCP endpoint.

Teams that want a hosted endpoint instead of running a local process.

VERIFIED ACTIVE

LAST COMMIT 2026-07-07 · ★ 2 · #808 OF 848 MAINTAINED OTHER · VERIFIED 2026-08-25

how we verify → /methodology

01 · Install Terrarium

before you install - you'll need

TERRARIUM_PAT

Environment variables documented in the project's README - it lists which are required and which have defaults.

Claude Code

claude mcp add nelsonsantryhkd-terrarium-plugin --transport http https://www.tryterrarium.com/api/mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "nelsonsantryhkd-terrarium-plugin": {
      "url": "https://www.tryterrarium.com/api/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://www.tryterrarium.com/api/mcp

transport: streamable-http

endpoint alive - authentication required · 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 remote - your agent's requests go to www.tryterrarium.com

endpoint auth requires authentication - rejected our unauthenticated MCP initialize

repo age created 2026-07-07 - young repo, little track record yet

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

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

03 · Who maintains Terrarium

Terrarium is maintained by nelsonsantryhkd. It's the only MCP server we track from this author; the repo dates to Jul 2026.

04 · Facts

repository
github.com/nelsonsantryhkd/terrarium-plugin
website
https://www.tryterrarium.com/
category
other - ranked #808 of 848 actively-maintained other servers as of 2026-08-25.
registry
io.github.nelsonsantryhkd/terrarium (active, first published 2026-07-07)

05 · Terrarium FAQ

What is Terrarium?

Give your agent a place to show its work to humans. Terrarium hosts the HTML your agent builds; humans review it in the browser with comments anchored to exact passages; the agent pulls that feedback over MCP, pushes fixes, and repeats until approved. It is available as a remote MCP endpoint.

Is Terrarium still maintained?

Yes - as of 2026-08-25, its last commit was 2026-07-07. We re-verify nightly.

How do I install Terrarium?

Run `claude mcp add nelsonsantryhkd-terrarium-plug --transport http https://www.tryterrarium.com/api/mcp`. The README documents one environment variable (TERRARIUM_PAT) to set first. You can also paste the ready-made client config above.

Does Terrarium require authentication?

Yes - when we probed the endpoint on 2026-08-25, it rejected an unauthenticated MCP initialize; you'll need credentials to connect.

06 · Alternatives to Terrarium

Alternatives to Terrarium

Maintained other servers if Terrarium isn't the fit.

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  3. Zotero MCP (54yyyu) Search, read, annotate, and add to your Zotero research library, local or web. ★ 4,780 · 2026-08-25
  4. Firebase MCP Gives AI development tools Firebase-specific capabilities and expertise. ★ 4,460 · 2026-08-25
  5. Microsoft Fabric MCP Server MCP tools for interacting with Microsoft Fabric ★ 3,598 · 2026-08-21
  6. Ship Swift 40+ production-ready SwiftUI recipes for building full-stack iOS apps via MCP. ★ 2,968 · 2026-08-09

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