# Gembook MCP server

Source: https://glimind.com/server/mcp-registry%2Fxyz.gembook%2Fgembook
Registry id: `mcp-registry/xyz.gembook/gembook`
Status: live (checked 2026-10-27T00:47:13.626Z)

## Verdict

Gembook MCP server answered 99.93% of Glimind's liveness checks over 30 days, better than 33% of MCP servers, with 984 ms median handshake and 5 outages in 90 days. Its agent-readiness grade is A (96/100) across 3 tools, costing an agent about 568 tokens to load. Checked every few minutes; no tool is ever called.

## Measurements (30 days)

| Metric | Value | Better than |
|---|---|---|
| Uptime, 30 days | 99.93% | 33% of MCP servers |
| Median handshake latency | 984 ms | 21% of MCP servers |
| p95 handshake latency | 3153 ms | — |
| Checks in 30 days | 4,975 | — |
| Outages, 90 days | 5 | — |
| Median recovery | 5 min | — |
| Agent-readiness score | 96/100 (A) | 82% of MCP servers |
| Tools | 3 | — |
| Tool-list size for an agent | ~568 tokens | 87% of MCP servers |
| Days observed | 29 | — |

## Install

```json
{
  "mcpServers": {
    "gembook-mcp-server": {
      "type": "http",
      "url": "https://gembook.xyz/api/mcp/mcp"
    }
  }
}
```

Claude Code:

```sh
claude mcp add --transport http gembook-mcp-server https://gembook.xyz/api/mcp/mcp
```

## Tools (3)

- `get_methodology_summary`: Returns a short summary of Gembook's valuation + trust methodology (what counts as a verified sale, confidence tiers, published error rates). Call this when a u
- `lookup_card_price`: Get Gembook's fair-value estimate (USD) for a PSA-graded vintage Pokémon card (WotC era, Base Set through Skyridge, 1999–2003). Returns fair value, range, confi
- `lookup_pop_report`: Get the PSA population (number of slabs graded per grade) for a vintage Pokémon card across all grades. Call this when a user asks how rare a PSA grade is for a

Measured by Glimind (https://glimind.com): MCP handshake + tool list only, no tool is ever called. CC BY 4.0.