Every change Wellknown observed on this MCP server, newest first, with what it was before and what it became. Tool-surface changes carry the definition diff. Nothing here is edited after the fact.
Changed the definition of "compare_hardware_scenarios", "compute_expectation", "compute_fault_tolerant_resources" and 9 more
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{"$schema":"https://json-schema.org/draft/2020-12/schema","additionalProperties":{},"properties":{"items":{"description":"Best-case gate and readout times per platform.","items":{"additionalProperties":{},"properties":{"hardwareType":{"description":"Join key to list_current_quantum_computers.","type":"string"},"native2QGate":{"type":"string"},"notes":{"type":"string"},"representativeDevice":{"description":"The testbed measured, not the joined current-hardware device.","type":"string"},"t2QGateTime":{"additionalProperties":{},"properties":{"seconds":{"description":"SI seconds.","type":"number"},"source":{"format":"uri","type":"string"}},"required":["seconds","source"],"type":"object"},"tMeasurement":{"additionalProperties":{},"properties":{"seconds":{"description":"SI seconds.","type":"number"},"source":{"format":"uri","type":"string"}},"required":["seconds","source"],"type":"object"}},"required":["hardwareType","representativeDevice","native2QGate","t2QGateTime","tMeasurement"],"type":"object"},"type":"array"}},"required":["items"],"type":"object"}qLDPC Code Catalog (Quantum Low-Density Parity-Check)Return the catalog of supported qLDPC (quantum low-density parity-check) error-correction codes (id, label, family, n, k ⟨119 unchanged words⟩
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Return the measured QUOPS (quantum universal operation performance system, a cross-platform capability benchmark) scores (arXiv:2609.12146): per device, the ⟨75 unchanged words⟩
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{"$schema":"https://json-schema.org/draft/2020-12/schema","additionalProperties":{},"properties":{"admissibleCone":{},"definition":{"type":"string"},"polarizationThreshold":{"type":"number"},"scores":{"items":{"additionalProperties":{},"properties":{"architecture":{"enum":["physical","physical-postselected","logical"],"type":"string"},"code":{"type":["string","null"]},"device":{"type":"string"},"discardFraction":{"type":["number","null"]},"hardwareType":{"type":"string"},"id":{"type":"string"},"physicalQubits":{"maximum":9007199254740991,"minimum":-9007199254740991,"type":"integer"},"quopsRatePerSecond":{"type":"number"},"quopsScore":{"type":"number"},"source":{"format":"uri","type":"string"},"vendor":{"type":"string"},"width":{"type":"number"},"year":{"type":"number"}},"required":["id","device","vendor","hardwareType","physicalQubits","architecture","code","quopsScore","width","quopsRatePerSecond","discardFraction","year","source"],"type":"object"},"type":"array"},"targets":{"items":{"additionalProperties":{},"properties":{"id":{"type":"string"},"logicalQubits":{"type":"number"},"note":{"type":["string","null"]},"problem":{"type":"string"},"quopsRateTargetPerSecond":{"type":"number"},"quopsTarget":{"type":"number"},"resourceEstimateSource":{"format":"uri","type":"string"},"source":{"format":"uri","type":"string"},"timeBudget":{"type":"string"},"toffoliCount":{"type":"number"}},"required":["id","problem","logicalQubits","toffoliCount","quopsTarget","quopsRateTargetPerSecond","timeBudget","resourceEstimateSource","source","note"],"type":"object"},"type":"array"}},"required":["definition","polarizationThreshold","admissibleCone","scores","targets"],"type":"object"}Certificate changed, valid to 2026-12-28
Added "list_quops_scores"; changed the definition of "compute_expectation" and "list_current_quantum_computers" (12 tools before, 13 now)
⟨6 unchanged words⟩ rate p, qubit count n, depth d, optional connectivity class), compute the effective error rate, success probability, and optional surface-code or qLDPC overhead. Without error correction a 2d-lattice connectivity is charged as a routing multiplier on depth (result.routingOverheadFactor); hardwareId supplies the device's class automatically. The response is self-describing (formulas, assumptions, ⟨36 unchanged words⟩
⟨7 unchanged words⟩ "minimum":1,"type":"integer"},"connectivity":{"description":"Two-qubit connectivity of the device: \"all-to-all\" (ion transport), \"reconfigurable\" (atom shuttling, treated as all-to-all) or \"2d-lattice\" (fixed nearest-neighbour couplers, charged as a routing multiplier on depth in the no-EC path). Defaults to the hardware entry's class when hardwareId is supplied, else to all-to-all.","enum":["all-to-all","reconfigurable","2d-lattice"],"type":"string"},"
Certificate recorded, valid to 2026-10-27
Authorization not required
First tool surface recorded: 12 tools (server version 0.6.0)
Showing the latest 6 events. The API returns up to 500 and filters by kind: ?kind=tool_surface_changed
⟨11 unchanged words⟩ type, physical qubit count, 2-qubit error rate, connectivity class with a note on the coupling graph, source URL). Same data that powers the website's "Current Quantum Computers" table. For the model's capability prediction per entry in QUOPS units, read hardwareContext.currentQuantumComputers[].modelCapability from compute_expectation; for measured scores, list_quops_scores.
Measured QUOPS Scores — Return the measured QUOPS capability scores (arXiv:2609.12146): per device, the largest random universal circuit size executed at polarization >= 1/sqrt(e) inside the cone w^2 <= s <= w^3, with width, QUOPS rate, architecture (physical, physical-postselected, logical) and source URL, plus the utility-scale targets in the same unit (RSA-2048 and FeMoco). These are measurements, the yardstick the site's own model is checked against: compare them with modelCapability.quopsEquivalent on the compute_expectation hardware context. Vendor and device names appear here because this table is agent-facin…