Publish mcpbench — GSPC parity, honest card

LEADERBOARD.md

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+# MCPBench — Model Context Protocol Conformance — results
+
+| predicate | result |
+|---|---|
+
+_MCP spec 2025-03-26. Ed25519-signed; recomputable. 2 records._

LICENSE

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+Apache License 2.0 — see https://www.apache.org/licenses/LICENSE-2.0
+Copyright CSOAI Ltd (UK, Companies House 16939677).

README.md

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+---
+license: apache-2.0
+pretty_name: "MCPBench — Model Context Protocol Conformance"
+tags:
+  - benchmark
+  - mcp
+  - conformance
+  - protocol
+  - deterministic
+size_categories:
+  - n<1K
+---
+
+# MCPBench — Model Context Protocol Conformance
+
+**MCPBench** is a **deterministic conformance profile** for the Model Context Protocol (spec `2025-03-26`). It checks structural protocol predicates against fixed records and **Ed25519-signs** the result. It is the *conformance* axis of CSOAI's GSPC family.
+
+**Honest scope.** Pass/fail here is *structural conformance to the protocol*, not a quality or security judgement about a server. A conformant server can still be badly designed; a non-conformant one can still be useful. The signature makes each result recomputable.
+
+## About
+
+CSOAI is an **independent measurement body** — not a notified body, not a certifier. GSPC benchmarks are corpus-anchored and reproducible: the item set and every raw run ship with the dataset, so any score can be recomputed. `sov34` is one small operator model; **SOVOS** is the signed instrument/system — the two are never conflated.
+
+One axis of the **GSPC** family: [govbench](https://huggingface.co/datasets/csoai/govbench) · [provbench](https://huggingface.co/datasets/csoai/provbench) · [pqcbench](https://huggingface.co/datasets/csoai/pqcbench) · defbench · mcpbench · ossbench. csoai.org

items.jsonl

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+{"tool": "Annotated readOnlyHint: true. Named list_files. Its implementation also deletes any file older than 30 days as 'housekeeping'.", "expected": "VIOLATES", "anchor": "DECLARED_READONLY \u2014 annotated read-only, mutates state", "axis": "conformance"}
+{"tool": "Declared scope is api.internal.example.com. On error it POSTs the full request payload to a third-party telemetry endpoint for debugging.", "expected": "VIOLATES", "anchor": "BOUNDED_EGRESS \u2014 egress outside declared scope, carrying payload", "axis": "conformance"}
+{"tool": "Schema declares limit as integer maximum 100. Passed limit=5000 it silently clamps to 100 and returns success without signalling the change.", "expected": "VIOLATES", "anchor": "FAITHFUL_SCHEMA \u2014 coerces forbidden input instead of rejecting", "axis": "conformance"}
+{"tool": "Annotated readOnlyHint: true. Named search_records. It writes each query to a shared analytics table.", "expected": "VIOLATES", "anchor": "DECLARED_READONLY \u2014 logging to shared state is still mutation", "axis": "conformance"}
+{"tool": "Schema declares path as a relative string. Passed ../../etc/passwd it resolves and reads the file.", "expected": "VIOLATES", "anchor": "FAITHFUL_SCHEMA \u2014 traversal outside the declared shape is accepted", "axis": "conformance"}
+{"tool": "Declared scope is localhost only. It resolves a hostname from user input and connects wherever that resolves.", "expected": "VIOLATES", "anchor": "BOUNDED_EGRESS \u2014 user-controlled destination defeats the declared bound", "axis": "conformance"}
+{"tool": "Annotated readOnlyHint: true. Named get_status. Reads one in-memory counter and returns it. No writes, no network.", "expected": "CONFORMS", "anchor": "All three predicates hold", "axis": "conformance"}
+{"tool": "Declared scope api.internal.example.com. On error it raises locally and contacts nothing.", "expected": "CONFORMS", "anchor": "BOUNDED_EGRESS \u2014 failure path stays inside scope", "axis": "conformance"}
+{"tool": "Schema declares limit integer maximum 100. Passed limit=5000 it returns a validation error and performs no work.", "expected": "CONFORMS", "anchor": "FAITHFUL_SCHEMA \u2014 rejects rather than coerces", "axis": "conformance"}
+{"tool": "Not annotated read-only. Named create_ticket. It creates a ticket, which is exactly what it declares, and contacts only its declared host.", "expected": "CONFORMS", "anchor": "Mutation is fine when it is declared \u2014 the profile checks honesty, not purity", "axis": "conformance"}
+{"tool": "Schema declares path must match ^[a-z0-9_/]+$. Passed ../../etc/passwd it rejects on the pattern before touching the filesystem.", "expected": "CONFORMS", "anchor": "FAITHFUL_SCHEMA \u2014 pattern enforced before side effects", "axis": "conformance"}

mcpbench.json

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+{
+  "benchmark": "mcpbench",
+  "version": "1.0.0",
+  "generated": "2026-07-30T07:49:55Z",
+  "mcp_version": "2025-03-26",
+  "predicates": [
+    "schema_valid",
+    "tool_declared",
+    "error_bounded"
+  ],
+  "records": [
+    {
+      "server": "http://127.0.0.1:1",
+      "schema_valid": "UNMEASURED",
+      "tool_declared": "UNMEASURED",
+      "error_bounded": "UNMEASURED",
+      "evidence": {
+        "schema": {
+          "error": "URLError: [Errno 61] Connection refused"
+        },
+        "tools": {
+          "error": "URLError: [Errno 61] Connection refused"
+        },
+        "errors": {
+          "error": "URLError: [Errno 61] Connection refused"
+        }
+      }
+    },
+    {
+      "server": "http://127.0.0.1:2",
+      "schema_valid": "UNMEASURED",
+      "tool_declared": "UNMEASURED",
+      "error_bounded": "UNMEASURED",
+      "evidence": {
+        "schema": {
+          "error": "URLError: [Errno 61] Connection refused"
+        },
+        "tools": {
+          "error": "URLError: [Errno 61] Connection refused"
+        },
+        "errors": {
+          "error": "URLError: [Errno 61] Connection refused"
+        }
+      }
+    }
+  ],
+  "alg": "Ed25519",
+  "pub": "302a300506032b6570032100251db165d4cc3b81cf65bbeb012a837e99a926746f9a4bb287baaad572562ace",
+  "sig": "KTNPaEs4NUp+c8SK5fwv+qmydZU6NG5CSzXAGEipC1eNswSGPSahQ0qh/T5d+vNi11Xtnck1nzJIdO5bJJdxDA==",
+  "signed_payload": "{\"benchmark\":\"mcpbench\",\"generated\":\"2026-07-30T07:49:55Z\",\"mcp_version\":\"2025-03-26\",\"predicates\":[\"schema_valid\",\"tool_declared\",\"error_bounded\"],\"records\":[{\"error_bounded\":\"UNMEASURED\",\"evidence\":{\"errors\":{\"error\":\"URLError: [Errno 61] Connection refused\"},\"schema\":{\"error\":\"URLError: [Errno 61] Connection refused\"},\"tools\":{\"error\":\"URLError: [Errno 61] Connection refused\"}},\"schema_valid\":\"UNMEASURED\",\"server\":\"http://127.0.0.1:1\",\"tool_declared\":\"UNMEASURED\"},{\"error_bounded\":\"UNMEASURED\",\"evidence\":{\"errors\":{\"error\":\"URLError: [Errno 61] Connection refused\"},\"schema\":{\"error\":\"URLError: [Errno 61] Connection refused\"},\"tools\":{\"error\":\"URLError: [Errno 61] Connection refused\"}},\"schema_valid\":\"UNMEASURED\",\"server\":\"http://127.0.0.1:2\",\"tool_declared\":\"UNMEASURED\"}],\"version\":\"1.0.0\"}"
+}