Centering Lab MCP Server

by centeringlab Your server? Claim it

answering

Centering Lab is answering right now. Last checked 11 min ago. It exposes 3 tools.

Measure card centering and check PSA, BGS, CGC and SGC centering ceilings and standards.

Uptime history 41 days of history · worst day 99%

41 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

126 ms

Response time

average over 24h

open, no key

Access

streamable-http

What changed 12

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 4 October 2026. No other catalogue keeps this.

5 Oct 3 tool descriptions were rewritten get_centering_standards, grade_centering, measure_card_centering

5 Oct 3 tools changed the parameters they ask for get_centering_standards, grade_centering, measure_card_centering

5 Oct a tool changed version3 times that day

4 Oct a tool description was rewritten grade_centering

4 Oct a tool changed the parameters it asks for grade_centering

4 Oct a tool changed version

and 2 more, back to 4 October 2026

Centering Lab missed one check this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add centering-lab --transport http https://centeringlab.com/mcp

Settings → Connectors → Add custom connector, then paste this address

https://centeringlab.com/mcp

~/.codex/config.toml

[mcp_servers.centering-lab]
url = "https://centeringlab.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "centering-lab": {
      "url": "https://centeringlab.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "centering-lab": {
      "type": "http",
      "url": "https://centeringlab.com/mcp"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

centering

get_centering_standards

USE ONLY for questions about published THRESHOLDS, tolerance, rules or SOURCES without grading the user's supplied numeric ratios. For PSA 10 compatibility with supplied ratios use grade_centering instead; it applies rounding and house-specific rules. If face/axis is unknown, ask first without any call. Example: {"house":"BGS","face":"back"}; fields optional, {} returns all. Houses PSA/BGS/CGC/SGC (case accepted), TAG excluded: explain proprietary assessment; never substitute another house. Face front/back in English; case/spaces accepted, reverse/obverse and translations rejected. SGC back has empty bands, no published table or ceiling; never invent one. Returns official/interpreted/approximate status, sources and verification. Not a final-grade prediction.

grade

grade_centering

USE THIS TOOL whenever the user supplies numeric centering ratios and asks whether a card meets PSA/BGS/CGC/SGC or asks for a centering ceiling. Do not calculate by looking up standards yourself. Example: {"front_lr":"55/45","front_tb":"60/40","house":"PSA"}. At least one known face AND axis; if either is unknown, ask first, never assume front/LR. Optional house PSA/BGS/CGC/SGC, TAG excluded. Flat front_lr/front_tb/back_lr/back_tb, or nested {"front":{"lr":"55/45","tb":"60/40"}}; no duplicates. Key/house case accepted. Ratios: percentages, fractions, pairs with / - – — : x or spaces, optional %, or [55,45]/["55","45"]. Scalar 1 rejected; use 1/99. Axis suffix must match field. Changes disclosed in normalizations. Partial input gives incomplete=true: report provisional ceiling and missing data. A ceiling from centering alone is NOT a predicted grade. SGC back alone has no published ceiling.

measure

measure_card_centering

Measure one ACTUAL photograph. Example shape: {"face":"front","image_base64":"<complete actual image bytes>"}. Ask front/back BEFORE calling if unknown. Exactly one user-provided public HTTPS image URL (port 443) or complete base64 source, never both. Never decode, repair or re-encode bytes yourself; never invent, shorten or rewrite base64; pass it verbatim, including an image data-URL prefix or whitespace (service normalizes). If chat attachment cannot be forwarded, send user to https://centeringlab.com/. card_size standard=63×88 mm including Japanese Pokémon; small=59×86 mm including Yu-Gi-Oh!, not inferred from language. Request a whole card flat from above on dark surface; if sleeved/toploader or tilted, recommend a retake first. Borderless: suggest back/manual site. API photos reach server memory; site stays local. needs-review/failed gives ceilings=null: retake or adjust manually, no grade prediction. Inspect status/code even on HTTP 200; respect Retry-After.

Endpoints

URL	Transport	State	Latency	Checked
https://centeringlab.com/mcp	streamable-http	answering	131 ms	11 min ago

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Centering Lab — questions

Answers built from our own checks of this server.

What can Centering Lab do?

It exposes 3 tools, read directly from the server on our last check. Among them: get_centering_standards, grade_centering, measure_card_centering. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Centering Lab working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 126 ms. The bar chart above shows every period we have measured.

How do I connect Centering Lab?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Centering Lab need an API key?

No. Centering Lab completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Centering Lab?

It answers our handshake in 126 ms on average, which is faster than 88% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.