Official MCP RegistryListed
Centering Lab
Measure card centering and check PSA, BGS, CGC and SGC centering ceilings and standards.
First seen 2 Oct 2026. Evidence as of 5 Oct 2026.
3
Tools
From an anonymous probe
1
Source listings
Each with its own history
2
Recorded changes
Since first seen
Tools
| Tool | Description | Behaviour |
|---|---|---|
| get_centering_standards | Look up card centering thresholds for PSA, BGS, CGC and SGC, optionally by house and front/back. Use for threshold/rules questions and source checks. Returns per-band official/interpreted/approximate status, source links, verification date/provenance and rounding rule. TAG is excluded. These are centering ceilings, not grade predictions. | Read-only |
| grade_centering | Return centering ceilings for PSA/BGS/CGC/SGC; optional house limits output. Keys: front_lr, front_tb, back_lr, back_tb, house. Example: {"front_lr":"55/45","front_tb":"60/40"}. Accept percentages (55), fractions (0.55), or pairs summing to 100 or 1; / - – — : x or spaces, optional %. Scalar 1 is ambiguous and rejected. L/R or left/right suffixes require *_lr; T/B or top/bottom require *_tb. Fractions are disclosed in normalizations. At least one axis required. Missing axes/faces may lower ceilings; BGS uses both axes. Not a grade prediction. | Read-only |
| measure_card_centering | Measure worst-station left/right and top/bottom card centering from one photograph. Ask front or back before calling. Request a whole card, flat on a dark surface, straight from above and out of its sleeve. The photo is processed on the server in memory and discarded, unlike the local-only website. Use a public HTTPS URL or image bytes supported by the client. If a chat attachment cannot be passed to this remote tool, send the user to https://centeringlab.com/. needs-review or failed means no grade ceilings: suggest a retake or manual website adjustment. Never predict a final grade. | Read-only |
Change history
- grade_centering: input schema changed (+house)
- grade_centering: description changed (+"Return" +"ceilings" +"PSA/BGS/CGC/SGC; optional house limits output. Keys: front_lr, front_tb, back_lr, back_tb, house. Example: {"front_lr":"55/45","front_tb":"60/40"}.")
| Source | Listing | First seen | Last seen | Versions |
|---|---|---|---|---|
| Official MCP Registry | com.centeringlab/centering-lab | 2 Oct 2026 | 5 Oct 2026 | 1 |