See the live GSPC board and current counts

effect-binding

family: gspc kind: deterministic-facts n: 261

What this axis measures

A dated, read-only boundary probe of remote MCP tool-call servers: whether an unauthorised extra argument is refused at the tool boundary. It does not observe backend effects or establish a vendor's security posture.

Why it matters

The GSPC board reports its current count in totals.public_count. A dated snapshot is useful for reproduction when its date and scope stay attached. Read the live board for the latest state.

Scope and exclusions

261 third-party MCP servers received a verdict (BINDS 0 · PARTIAL 23 · DOES_NOT_BIND 238) out of 600 tried from a frozen shuffled slice (seed 20260922) of the 20,992 third-party servers with a remote URL in the public MCP registry on 2026-09-22. 230 UNCHECKABLE (141 behind an auth wall), 78 UNREACHABLE, 30 with no read-only tool and 1 with no tools are recorded and never counted. A server count, never pooled with bank-item n.

The verdict population is biased toward servers that answer anonymous callers: every server that demanded credentials is UNCHECKABLE by rule, never probed and never FAIL. Our own 41 registry entries are tabled separately in the artifact and are not in n.

What's NOT here

This is measurement, not certification. A board row does not by itself prove a signature, Merkle-root inclusion, Bitcoin anchoring, a model approval or compliance. Check each evidence step separately.

The numbers

n=261 tool-call servers probed. This is a count within the declared run scope, not a model-bank size, accuracy or statistical separation. Read the live row for exclusions and limitations.

Read the dated probe

How the 600-server effect-binding probe was run and verified explains the read-only method, all 339 attempts without a binding verdict, the signed envelope, and what the result cannot establish.

Verify this axis

Read the live board and published run evidence. The corrections ledger records later changes. Signature verification and any root or OTS inclusion are distinct checks; none is inferred from this page.