Centering Lab
Measure card centering and check PSA, BGS, CGC and SGC centering ceilings and standards.
Connect it
Settings → Connectors → Add custom connector
URL: https://centeringlab.com/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://centeringlab.com/mcp{
"mcpServers": {
"centering-lab": {
"url": "https://centeringlab.com/mcp"
}
}
}claude mcp add --transport http centering-lab https://centeringlab.com/mcp{
"servers": {
"centering-lab": {
"type": "http",
"url": "https://centeringlab.com/mcp"
}
}
}3 tools, verified live
grade_centeringread-onlyUSE 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
get_centering_standardsread-onlyUSE 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
measure_card_centeringread-onlyMeasure 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 w
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