diff --git a/Cargo.toml b/Cargo.toml
index 2746300..bca990f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,7 +11,7 @@ license = "MIT"
 readme = "README.md"
 keywords = ["email", "schema", "json-schema", "agents"]
 categories = ["data-structures", "email"]
-include = ["src/**", "schemas/**", "Cargo.toml", "README.md", "LICENSE"]
+include = ["src/**", "schemas/**", "contracts/**", "Cargo.toml", "README.md", "LICENSE"]
 
 [dev-dependencies]
 serde_json = "1"
diff --git a/README.md b/README.md
index b36d2c0..1658447 100644
--- a/README.md
+++ b/README.md
@@ -19,12 +19,13 @@ Rust 1.70 or newer is required.
 ## Use a schema
 
 ```rust
-use mailschema::{Schema, MAP_0_1_SCHEMA};
+use mailschema::{Schema, CONTENT_REVIEW_0_1_CONTRACT, MAP_0_1_SCHEMA};
 
 assert_eq!(Schema::Map01.as_str(), MAP_0_1_SCHEMA);
 
 let content_review = Schema::ContentReview01.as_str();
 assert!(content_review.contains("Content Review"));
+assert!(CONTENT_REVIEW_0_1_CONTRACT.contains("MapTypeContract"));
 ```
 
 The crate exposes four Draft 2020-12 documents:
@@ -36,6 +37,8 @@ The crate exposes four Draft 2020-12 documents:
 
 Parse the strings with your JSON library and pass them to a Draft 2020-12 validator with format checking enabled. The crate deliberately does not select a validation engine for its consumers.
 
+`CONTENT_REVIEW_0_1_CONTRACT` exposes the canonical type contract used by MAP wire messages.
+
 ## Trust boundary
 
 A valid document is structured input. Schema validation does not authenticate a service, grant authority, approve an action, check Registry references or establish product conformance. Implementations must apply their own endpoint trust, credentials, permissions and policy before executing a request.
diff --git a/UPSTREAM.md b/UPSTREAM.md
index d358fa9..4d7b155 100644
--- a/UPSTREAM.md
+++ b/UPSTREAM.md
@@ -4,4 +4,4 @@ Version `0.1.2` was prepared from [`mailschema/mailschema@eddc745`](https://gith
 
 The included contribution schema has SHA-256 digest `a8a241b4837971a6251bcc135c704283536f4fb825fbbaedaf1598c6e688d564`. The canonical schemas live in the main MailSchema repository; this repository owns the Rust package surface and its release history.
 
-The unreleased MAP contract projection is derived from [`mailschema/mailschema@ab91b37`](https://github.com/mailschema/mailschema/commit/ab91b37d29dbf95a2e208a34a144bf5f7c26d0a6). Its MAP schema digest is `d908a960f53fade9ab47876bf69b1b3d037adeb7096091e22ca71fbc3909429c`; its Content Review schema digest is `dba2a2f1e57f843f43080f5a40ced2d9c84e7c7036ec306c371a82d39f6d6c9f`. These files are projections of that source commit and do not independently define MAP.
+The unreleased MAP contract projection is derived from [`mailschema/mailschema@e2f2cc6`](https://github.com/mailschema/mailschema/commit/e2f2cc6983173e5aba1da27f1f8bff37336efd77). Its MAP schema digest is `c39befeecf8643e8beda1f53a8d1411482b68ddf14974f3806cfa95776103f85`; its Content Review schema digest is `10e2263c820ba3a6ef0381c377078e2c1f324c3b142a6f8caf92b298cc66c692`; and its Content Review contract byte digest is `754ab7245ddb09ff4da000fccc60d746724379d4146ea227973e5d87f105f800`. These files are exact projections of that source commit and do not independently define MAP.
diff --git a/contracts/content-review-0.1.json b/contracts/content-review-0.1.json
new file mode 100644
index 0000000..922baef
--- /dev/null
+++ b/contracts/content-review-0.1.json
@@ -0,0 +1,58 @@
+{
+  "kind": "MapTypeContract",
+  "id": "https://mailschema.org/types/content-review",
+  "version": "0.1",
+  "profile": "https://mailschema.org/profiles/map/0.1",
+  "target": "Service-owned content at the exact revision and digest named in the request.",
+  "requestSchema": {
+    "url": "https://mailschema.org/schemas/content-review-0.1.schema.json",
+    "canonicalDigest": "sha-256:cdad1149ab193d1bf71cb9463e3c4b7331ed56b0123e225adf68f70a2022b29d"
+  },
+  "operations": [
+    {
+      "id": "request-changes",
+      "effect": "Record review feedback on the named revision.",
+      "results": [
+        {
+          "state": "accepted",
+          "outputSchema": {
+            "type": "object",
+            "additionalProperties": false,
+            "properties": {
+              "feedbackRecorded": { "const": true }
+            },
+            "required": ["feedbackRecorded"]
+          }
+        }
+      ]
+    },
+    {
+      "id": "approve",
+      "effect": "Record approval of the named revision.",
+      "results": [
+        {
+          "state": "approval-required",
+          "outputSchema": {
+            "type": "object",
+            "additionalProperties": false,
+            "properties": {
+              "approvalUrl": { "type": "string", "format": "uri", "pattern": "^https://" }
+            },
+            "required": ["approvalUrl"]
+          }
+        },
+        {
+          "state": "completed",
+          "outputSchema": {
+            "type": "object",
+            "additionalProperties": false,
+            "properties": {
+              "decision": { "const": "approved" }
+            },
+            "required": ["decision"]
+          }
+        }
+      ]
+    }
+  ]
+}
diff --git a/schemas/content-review-0.1.schema.json b/schemas/content-review-0.1.schema.json
index 61c1f22..57fc90f 100644
--- a/schemas/content-review-0.1.schema.json
+++ b/schemas/content-review-0.1.schema.json
@@ -1,7 +1,7 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "https://mailschema.org/schemas/content-review-0.1.schema.json",
-  "title": "Content Review 0.1 MAP request",
+  "title": "Content Review 0.1 MAP request binding",
   "allOf": [
     { "$ref": "https://mailschema.org/schemas/map-0.1.schema.json#/$defs/request" },
     {
@@ -11,10 +11,7 @@
           "type": "object",
           "properties": {
             "id": { "const": "https://mailschema.org/types/content-review" },
-            "version": { "const": "0.1" },
-            "recordDigest": {
-              "const": "sha-256:0e6365df1bf904f2475f972ec66a5561edc0bfaae69fd7a1b41f53b40bf8ac1c"
-            }
+            "version": { "const": "0.1" }
           }
         }
       }
diff --git a/schemas/map-0.1.schema.json b/schemas/map-0.1.schema.json
index 2cc1dfe..352cd5d 100644
--- a/schemas/map-0.1.schema.json
+++ b/schemas/map-0.1.schema.json
@@ -32,7 +32,7 @@
       "type": "string",
       "pattern": "^sha-256:[a-f0-9]{64}$"
     },
-    "recordDigest": {
+    "contractDigest": {
       "type": "string",
       "pattern": "^sha-256:[a-f0-9]{64}$"
     },
@@ -46,9 +46,9 @@
           "pattern": "^[0-9]+\\.[0-9]+(?:\\.[0-9]+)?(?:-[a-zA-Z0-9.-]+)?$",
           "maxLength": 80
         },
-        "recordDigest": { "$ref": "#/$defs/recordDigest" }
+        "contractDigest": { "$ref": "#/$defs/contractDigest" }
       },
-      "required": ["id", "version", "recordDigest"]
+      "required": ["id", "version", "contractDigest"]
     },
     "target": {
       "type": "object",
@@ -172,7 +172,6 @@
         "profile": { "$ref": "#/$defs/profile" },
         "requestId": { "$ref": "#/$defs/uuidUrn" },
         "interactionId": { "$ref": "#/$defs/uuidUrn" },
-        "requestedAt": { "type": "string", "format": "date-time" },
         "type": { "$ref": "#/$defs/typeReference" },
         "operation": {
           "type": "string",
@@ -187,7 +186,6 @@
         "profile",
         "requestId",
         "interactionId",
-        "requestedAt",
         "type",
         "operation",
         "target",
@@ -273,61 +271,139 @@
         },
         "target": { "$ref": "#/$defs/target" }
       },
-      "required": [
-        "type",
-        "title",
-        "status",
-        "detail",
-        "instance",
-        "profile",
-        "requestId",
-        "interactionId",
-        "code"
-      ],
+      "required": ["type", "title", "status", "detail"],
+      "dependentRequired": {
+        "instance": ["profile", "requestId", "code"],
+        "profile": ["instance", "requestId", "code"],
+        "requestId": ["instance", "profile", "code"],
+        "interactionId": ["instance", "profile", "requestId", "code"],
+        "code": ["instance", "profile", "requestId"]
+      },
       "allOf": [
+        {
+          "if": {
+            "properties": { "code": { "not": { "const": "result-not-found" } } },
+            "required": ["code"]
+          },
+          "then": { "required": ["interactionId"] }
+        },
         {
           "if": { "properties": { "code": { "const": "invalid-request" } }, "required": ["code"] },
-          "then": { "properties": { "type": { "const": "https://mailschema.org/problems/invalid-request" }, "status": { "const": 400 } } }
+          "then": {
+            "properties": {
+              "type": { "const": "https://mailschema.org/problems/invalid-request" },
+              "status": { "const": 400 }
+            }
+          }
         },
         {
-          "if": { "properties": { "code": { "const": "authentication-required" } }, "required": ["code"] },
-          "then": { "properties": { "type": { "const": "https://mailschema.org/problems/authentication-required" }, "status": { "const": 401 } } }
+          "if": {
+            "properties": { "code": { "const": "authentication-required" } },
+            "required": ["code"]
+          },
+          "then": {
+            "properties": {
+              "type": { "const": "https://mailschema.org/problems/authentication-required" },
+              "status": { "const": 401 }
+            }
+          }
         },
         {
           "if": { "properties": { "code": { "const": "refused" } }, "required": ["code"] },
-          "then": { "properties": { "type": { "const": "https://mailschema.org/problems/refused" }, "status": { "const": 403 } } }
+          "then": {
+            "properties": {
+              "type": { "const": "https://mailschema.org/problems/refused" },
+              "status": { "const": 403 }
+            }
+          }
         },
         {
           "if": { "properties": { "code": { "const": "result-not-found" } }, "required": ["code"] },
-          "then": { "properties": { "type": { "const": "https://mailschema.org/problems/result-not-found" }, "status": { "const": 404 } } }
+          "then": {
+            "properties": {
+              "type": { "const": "https://mailschema.org/problems/result-not-found" },
+              "status": { "const": 404 }
+            }
+          }
         },
         {
           "if": { "properties": { "code": { "const": "stale-target" } }, "required": ["code"] },
-          "then": { "properties": { "type": { "const": "https://mailschema.org/problems/stale-target" }, "status": { "const": 409 } }, "required": ["target"] }
+          "then": {
+            "properties": {
+              "type": { "const": "https://mailschema.org/problems/stale-target" },
+              "status": { "const": 409 }
+            },
+            "required": ["target"]
+          }
         },
         {
-          "if": { "properties": { "code": { "const": "idempotency-conflict" } }, "required": ["code"] },
-          "then": { "properties": { "type": { "const": "https://mailschema.org/problems/idempotency-conflict" }, "status": { "const": 409 } } }
+          "if": {
+            "properties": { "code": { "const": "idempotency-conflict" } },
+            "required": ["code"]
+          },
+          "then": {
+            "properties": {
+              "type": { "const": "https://mailschema.org/problems/idempotency-conflict" },
+              "status": { "const": 409 }
+            }
+          }
         },
         {
-          "if": { "properties": { "code": { "const": "request-in-progress" } }, "required": ["code"] },
-          "then": { "properties": { "type": { "const": "https://mailschema.org/problems/request-in-progress" }, "status": { "const": 409 } } }
+          "if": {
+            "properties": { "code": { "const": "request-in-progress" } },
+            "required": ["code"]
+          },
+          "then": {
+            "properties": {
+              "type": { "const": "https://mailschema.org/problems/request-in-progress" },
+              "status": { "const": 409 }
+            }
+          }
         },
         {
-          "if": { "properties": { "code": { "const": "expired-interaction" } }, "required": ["code"] },
-          "then": { "properties": { "type": { "const": "https://mailschema.org/problems/expired-interaction" }, "status": { "const": 410 } } }
+          "if": {
+            "properties": { "code": { "const": "expired-interaction" } },
+            "required": ["code"]
+          },
+          "then": {
+            "properties": {
+              "type": { "const": "https://mailschema.org/problems/expired-interaction" },
+              "status": { "const": 410 }
+            }
+          }
         },
         {
-          "if": { "properties": { "code": { "const": "unsupported-profile" } }, "required": ["code"] },
-          "then": { "properties": { "type": { "const": "https://mailschema.org/problems/unsupported-profile" }, "status": { "const": 422 } } }
+          "if": {
+            "properties": { "code": { "const": "unsupported-profile" } },
+            "required": ["code"]
+          },
+          "then": {
+            "properties": {
+              "type": { "const": "https://mailschema.org/problems/unsupported-profile" },
+              "status": { "const": 422 }
+            }
+          }
         },
         {
           "if": { "properties": { "code": { "const": "unsupported-type" } }, "required": ["code"] },
-          "then": { "properties": { "type": { "const": "https://mailschema.org/problems/unsupported-type" }, "status": { "const": 422 } } }
+          "then": {
+            "properties": {
+              "type": { "const": "https://mailschema.org/problems/unsupported-type" },
+              "status": { "const": 422 }
+            }
+          }
         },
         {
-          "if": { "properties": { "code": { "const": "unsupported-operation" } }, "required": ["code"] },
-          "then": { "properties": { "type": { "const": "https://mailschema.org/problems/unsupported-operation" }, "status": { "const": 422 } } }
+          "if": {
+            "properties": { "code": { "const": "unsupported-operation" } },
+            "required": ["code"]
+          },
+          "then": {
+            "properties": {
+              "type": { "const": "https://mailschema.org/problems/unsupported-operation" },
+              "status": { "const": 422 }
+            }
+          }
         }
       ]
     }
diff --git a/src/lib.rs b/src/lib.rs
index cabd798..d16a0b8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -15,7 +15,11 @@ pub const RECORD_SCHEMA: &str = include_str!("../schemas/record.schema.json");
 pub const MAP_0_1_SCHEMA: &str = include_str!("../schemas/map-0.1.schema.json");
 
 /// Content Review 0.1 request binding.
-pub const CONTENT_REVIEW_0_1_SCHEMA: &str = include_str!("../schemas/content-review-0.1.schema.json");
+pub const CONTENT_REVIEW_0_1_SCHEMA: &str =
+    include_str!("../schemas/content-review-0.1.schema.json");
+
+/// Canonical Content Review 0.1 type contract.
+pub const CONTENT_REVIEW_0_1_CONTRACT: &str = include_str!("../contracts/content-review-0.1.json");
 
 /// Supported local schema documents.
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
@@ -51,13 +55,25 @@ mod tests {
             Schema::ContentReview01,
         ] {
             let value: serde_json::Value = serde_json::from_str(schema.as_str()).unwrap();
-            assert_eq!(value["$schema"], "https://json-schema.org/draft/2020-12/schema");
+            assert_eq!(
+                value["$schema"],
+                "https://json-schema.org/draft/2020-12/schema"
+            );
         }
         let contribution: serde_json::Value = serde_json::from_str(CONTRIBUTION_SCHEMA).unwrap();
         assert!(contribution["$defs"]["record"].is_object());
         let map: serde_json::Value = serde_json::from_str(MAP_0_1_SCHEMA).unwrap();
-        assert_eq!(map["$id"], "https://mailschema.org/schemas/map-0.1.schema.json");
+        assert_eq!(
+            map["$id"],
+            "https://mailschema.org/schemas/map-0.1.schema.json"
+        );
         let record: serde_json::Value = serde_json::from_str(RECORD_SCHEMA).unwrap();
         assert_eq!(record["$ref"], "#/$defs/record");
+        let contract: serde_json::Value =
+            serde_json::from_str(CONTENT_REVIEW_0_1_CONTRACT).unwrap();
+        assert_eq!(
+            contract["id"],
+            "https://mailschema.org/types/content-review"
+        );
     }
 }