Bernstein Mcp

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io.github.sipyourdrink-ltd/bernstein-mcpv0.2.0

Verifies Bernstein run receipts and hash chains; lists the shipped presets and adapters. Read-only.

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explain_receipt

Verify a run receipt and narrate the result in plain language: what the run recorded, which chains recomputed, where the first divergence is, and what an auditor can and cannot conclude without the producing install's keys.

receiptstring, required

The run receipt: pass the file contents as a string for byte-exact verification, or the parsed object.

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Tools (11)

explain_receipt

Argument	Type	Description
receipt*	any	The run receipt: pass the file contents as a string for byte-exact verification, or the parsed object.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "receipt"
  ],
  "properties": {
    "receipt": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "object",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {}
        }
      ],
      "description": "The run receipt: pass the file contents as a string for byte-exact verification, or the parsed object."
    }
  }
}

explain_trace_mapping

How a bernstein run maps onto a TRACE v0.2 Trust Record: one row per claim with the journal field it is sourced from and the rule that derives it. Pass a run receipt to fill in the rows its embedded journal can answer (subject, iat, model, data_class, policy digest, tool transcript) alongside the receipt's own verdict.

Argument	Type	Description
receipt	any	Optional run receipt: the file contents as a string, or the parsed object.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "receipt": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "object",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {}
        }
      ],
      "description": "Optional run receipt: the file contents as a string, or the parsed object."
    }
  }
}

get_preset

Every field of one compliance preset as bernstein v3.19.2 resolves it.

Argument	Type	Description
name*	string

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "name"
  ],
  "properties": {
    "name": {
      "enum": [
        "development",
        "hipaa",
        "regulated",
        "standard"
      ],
      "type": "string"
    }
  }
}

list_adapters

The agent adapters bundled with bernstein v3.19.2: adapter name, the binary it drives, the module that implements it.

No arguments.

Input schema (JSON)

{
  "type": "object",
  "properties": {}
}

list_presets

The compliance presets bernstein v3.19.2 ships, with the switches each one turns on.

No arguments.

Input schema (JSON)

{
  "type": "object",
  "properties": {}
}

server_info

Identity, version, and request limits for this MCP server.

No arguments.

Input schema (JSON)

{
  "type": "object",
  "properties": {}
}

verify_agent_manifest

Agent Manifest v0.2 conformance checks on one manifest, stateless, no account: schema (vendored agent-manifest.schema.json), profile context, version, canonicalization, COSE envelope signature (Ed25519, key identified by kid in the protected header; ML-DSA-65 is reported unverifiable). Optionally checks that a TRACE Trust Record cites this manifest by digest. Nothing is fetched; resolvers are checked as URIs only. The manifest hash is sha256 over the COSE payload bytes (or RFC 8785 canonical JSON for object input).

Argument	Type	Description
manifest*	any	The agent manifest: COSE envelope as base64 string, or the parsed JSON object (payload).
trustRecord	object	Optional TRACE v0.2 Trust Record to check if it cites this manifest (references[].rel == 'agent-manifest').

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "manifest"
  ],
  "properties": {
    "manifest": {
      "anyOf": [
        {
          "type": "string",
          "maxLength": 1048576
        },
        {
          "type": "object",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {}
        }
      ],
      "description": "The agent manifest: COSE envelope as base64 string, or the parsed JSON object (payload)."
    },
    "trustRecord": {
      "type": "object",
      "description": "Optional TRACE v0.2 Trust Record to check if it cites this manifest (references[].rel == 'agent-manifest').",
      "propertyNames": {
        "type": "string"
      },
      "additionalProperties": {}
    }
  }
}

verify_chain

Walk bernstein chain rows and recompute every link: journal rows (event_hash), lineage spine entries (entry_hash) or audit events (prev_hmac linkage). The row kind is detected from the fields, or pass `kind` explicitly. Reports the first divergent index. Pass `entries` as the file text (a JSON array or one row per line, as journal.jsonl is written) for byte-exact hashing; a parsed array also works, but then a float spelled 1.0 or -0.0 in the file cannot be told apart from an integer.

Argument	Type	Description
kind	string
entries*	any	Rows in chain order, oldest first: a JSON array, or the raw text of the file.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "entries"
  ],
  "properties": {
    "kind": {
      "enum": [
        "journal",
        "spine",
        "audit_linkage"
      ],
      "type": "string"
    },
    "entries": {
      "anyOf": [
        {
          "type": "array",
          "items": {
            "type": "object",
            "propertyNames": {
              "type": "string"
            },
            "additionalProperties": {}
          },
          "maxItems": 2000
        },
        {
          "type": "string",
          "maxLength": 1048576
        }
      ],
      "description": "Rows in chain order, oldest first: a JSON array, or the raw text of the file."
    }
  }
}

verify_delegation_chain

TRACE v0.2 delegation-chain conformance, stateless, no account: index every Trust Record by the RFC 8785 digest of its complete form, start at the leaf, follow delegation.parent_record_hash to the root, and check each hop's signature, the root key against `trusted_root_keys`, the depth bound, the link's digest algorithm, the credential (registered, issuer = parent subject, holder = record subject, window at the hop's own iat) and data_class narrowing under `data_class_lattice`. Classification: provenance-invalid outranks authorization-invalid; an unread link is unverifiable, not broken. Pass `records` as a JSON array or as file text (one record per line or a JSON array).

Argument	Type	Description
context	object
records*	any	The record set in any order: a JSON array of records (objects or strings), or the raw text of a file.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "records"
  ],
  "properties": {
    "context": {
      "type": "object",
      "properties": {
        "now": {
          "type": "number",
          "description": "Carried for completeness; credential windows are judged at each hop's own iat."
        },
        "leaf": {
          "type": "string",
          "description": "Digest of the record under appraisal (`sha256:<hex>`); absent → the record no other record names as parent."
        },
        "max_depth": {
          "type": "integer",
          "maximum": 9007199254740991,
          "minimum": 0,
          "description": "Default 8."
        },
        "credentials": {
          "type": "object",
          "description": "credential_id → {issuer, holder, not_before, not_after}. Default {} → every hop's credential is unknown.",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {
            "type": "object",
            "required": [
              "issuer",
              "holder",
              "not_before",
              "not_after"
            ],
            "properties": {
              "holder": {
                "type": "string"
              },
              "issuer": {
                "type": "string"
              },
              "not_after": {
                "type": "integer",
                "maximum": 9007199254740991,
                "minimum": -9007199254740991
              },
              "not_before": {
                "type": "integer",
                "maximum": 9007199254740991,
                "minimum": -9007199254740991
              }
            }
          }
        },
        "trusted_root_keys": {
          "type": "array",
          "items": {
            "type": "object",
            "propertyNames": {
              "type": "string"
            },
            "additionalProperties": {}
          },
          "description": "Public JWKs; identity is (kty, crv, x, y). Default [] → the root is untrusted."
        },
        "data_class_lattice": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Least to most sensitive; classes outside it are not compared. Default []."
        },
        "supported_digest_algorithms": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Default [\"sha256\"]; \"sha384\" is also computed."
        }
      }
    },
    "records": {
      "anyOf": [
        {
          "type": "array",
          "items": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "object",
                "propertyNames": {
                  "type": "string"
                },
                "additionalProperties": {}
              }
            ]
          }
        },
        {
          "type": "string",
          "maxLength": 1048576
        }
      ],
      "description": "The record set in any order: a JSON array of records (objects or strings), or the raw text of a file."
    }
  }
}

verify_receipt

Recompute every hash chain a bernstein run receipt embeds (journal, lineage spine, optional audit range), rebuild the signed subject from the recomputed heads, and check the Ed25519 signature with the key the receipt carries. Needs no secret and reads nothing but the receipt. Returns the verdict, the first failing check, one line per check, and the same verdict as a DSSE envelope signed by this verifier's Ed25519 key (public key at keys_url) so the outcome can be kept and re-checked offline.

Argument	Type	Description
receipt*	any	The run receipt: pass the file contents as a string for byte-exact verification, or the parsed object.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "receipt"
  ],
  "properties": {
    "receipt": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "object",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {}
        }
      ],
      "description": "The run receipt: pass the file contents as a string for byte-exact verification, or the parsed object."
    }
  }
}

verify_trace_record

TRACE v0.2 conformance checks on one Trust Record, stateless, no account: schema (vendored trace-claim.json), profile, subject URI, software-only runtime rule, policy digest, public-only confirmation key, the embedded signature (EdDSA, ES256 or ES384 with the key in cnf.jwk), appraisal, delegation link shape and references. Nothing is fetched: resolvers are checked as URIs only. `record_sha256` is the RFC 8785 digest of the complete record, signature included — the value a child hop puts in delegation.parent_record_hash.

Argument	Type	Description
record*	any	A TRACE v0.2 Trust Record: the file contents as a string, or the parsed object.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "record"
  ],
  "properties": {
    "record": {
      "anyOf": [
        {
          "type": "string",
          "maxLength": 1048576
        },
        {
          "type": "object",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {}
        }
      ],
      "description": "A TRACE v0.2 Trust Record: the file contents as a string, or the parsed object."
    }
  }
}