diff --git a/README.md b/README.md
index e2c88c5..ad2b19f 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,14 @@ demonstrates. `inherited` may reuse an Evidence artifact that covers the clause.
 Contract without `evidence_mode` keeps the original all-direct behavior, so a
 framework update never weakens an existing Contract silently.
 
+A Contract's `change_id` identifies its originating Change, not its applicability.
+Snapshots retain Contracts across Changes; action Context selects the applicable
+clauses by `applies_to` or an explicit clause reference in `verification_scope`.
+Revalidation therefore includes the selected clause's text, authority reference,
+evidence mode, and source digests even when another Change created the Contract.
+When upgrading from Change-filtered Snapshots, an existing Impact Assessment may
+need to be refreshed because its Contract index now includes those Contracts.
+
 **They grow.** A question answered once does not come back - the next change
 that touches deletion finds the clause and resolves against it instead of
 asking again. An incident becomes a
diff --git a/docs/concepts.ja.md b/docs/concepts.ja.md
index e50b250..a9e4368 100644
--- a/docs/concepts.ja.md
+++ b/docs/concepts.ja.md
@@ -99,6 +99,9 @@ Contractまたは条項の`evidence_mode`で、検証に掛ける費用を選べ
 
 `adf next`は、各作業に必要な文脈だけを組み立てます。影響評価には、リポジトリ、Contract、Decisionの索引と、過去の影響評価を最大3件まで渡します。評価が確定した後の実装には、その評価結果と、対象に合う規範やコードだけを渡します。後続の作業がリポジトリ全体を調べ直す必要はありません。
 
+Contractの`change_id`は作成元のChangeを表し、適用範囲を限定しません。Snapshotには別Changeで作成したContractも保持し、担当へ渡す条項は`applies_to`や`verification_scope`の明示指定で選びます。再検証では、別Changeの条項も本文、権威参照、証拠方式、参照元のダイジェストとともに渡します。
+従来のChangeで絞り込む版から更新すると、Contract索引が変わるため、既存の影響評価の更新を求められる場合があります。
+
 影響評価が済んでいない間、`adf next`と`adf explain`は、リポジトリ全体のContract検証状態を計算する前に影響評価を次の作業として選びます。この最初の段階では、無関係なChangeのResultとEvidenceを読み込みません。
 
 Contract検証状態が必要な場合は、Evidenceと検証Resultの永続索引を`.adf/cache/runtime/`に作ります。変更のない記録はGitのBlob ID、変更中または未追跡の記録は内容ハッシュで識別します。元の記録が変わった場合だけJSONを読み直し、条項ごとに全Resultを繰り返し検索しません。索引が壊れている場合は正本から作り直します。Gitがキャッシュ先を無視すると確認できた場合だけ、索引をファイルへ保存します。
diff --git a/skill-src/adf-builder/SKILL.md b/skill-src/adf-builder/SKILL.md
index 4dbc591..709541c 100644
--- a/skill-src/adf-builder/SKILL.md
+++ b/skill-src/adf-builder/SKILL.md
@@ -46,6 +46,11 @@ This is the most common way the control plane gets bypassed. Resist it.
 
 ## `record-evidence`
 
+For `contract-clause-revalidated`, use the corresponding `contract_clauses` entry
+whose `selected_for` contains the requirement's instance key. Contracts created by
+another Change remain applicable; `change_id` identifies their origin. Use the
+issued clause text, scope, evidence mode, authority reference, and source digests.
+
 Show that each requirement instance in the action actually holds. For each one, call
 `adf_add_evidence` with what you observed, then submit an `outcomes` entry:
 
diff --git a/src/contract_health.rs b/src/contract_health.rs
index d803b7f..d2eecc6 100644
--- a/src/contract_health.rs
+++ b/src/contract_health.rs
@@ -678,6 +678,91 @@ mod tests {
         );
     }
 
+    #[test]
+    fn explicit_cross_change_verification_distributes_context_and_accepts_evidence() {
+        use crate::application::InMemoryApplication;
+        use crate::submission::ResultSubmission;
+
+        let schemas = registry();
+        let fixture = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("testdata/fixtures/db-sqs");
+        let rules =
+            serde_yaml::from_str(&std::fs::read_to_string(fixture.join("rules.yaml")).unwrap())
+                .unwrap();
+        let lock = serde_yaml::from_str(
+            &std::fs::read_to_string(fixture.join("framework-lock.yaml")).unwrap(),
+        )
+        .unwrap();
+        for status in ["unverified", "stale", "failed"] {
+            let mut project = project_with_evidence(
+                if status == "failed" {
+                    "failed"
+                } else {
+                    "passed"
+                },
+                if status == "failed" {
+                    "unsatisfied"
+                } else {
+                    "satisfied"
+                },
+            );
+            project["contracts"][0]["change_id"] = json!("change.test");
+            // Explicit selection must work even without a subject overlap.
+            project["contracts"][0]["applies_to"] = json!([]);
+            let digest = digest_value(&project["contracts"][0]).unwrap();
+            project["results"][0]["input_refs"]["contract.test"] = json!(digest);
+            project["results"][0]["freshness_refs"]["contract.test"] = json!(digest);
+            project["results"][0]["payload"]["outcomes"][0]["input_refs"]["contract.test"] =
+                json!(digest);
+            project["results"][0]["payload"]["outcomes"][0]["freshness_refs"]["contract.test"] =
+                json!(digest);
+            if status == "unverified" {
+                project["results"] = json!([]);
+                project["evidence"] = json!([]);
+            } else if status == "stale" {
+                project["repository"]["artifacts"][0]["digest"] =
+                    json!(format!("sha256:{}", "d".repeat(64)));
+            }
+            project["repository"]["phase"] = json!("post-build");
+            project["repository"]["coverage"] = json!({"status": "complete", "scope": "declared-artifacts", "analyzed_refs": [], "gaps": []});
+            project["changes"].as_array_mut().unwrap().push(json!({
+                "schema_version": "1", "id": "change.verify", "title": "Verify an existing clause", "intent": "Verify stable output",
+                "verification_scope": ["contract.test#stable-output"]
+            }));
+            let mut app = InMemoryApplication::new(project, &rules, &lock, &schemas).unwrap();
+            assert_eq!(app.contract_health().unwrap().clauses[0].status, status);
+            let response = app.next("change.verify").unwrap();
+            assert_eq!(response.decision.state, "needs-evidence");
+            let context = response.context.unwrap();
+            let clause = &context.contract_clauses[0];
+            assert_eq!(clause.clause_ref, "contract.test#stable-output");
+            assert_eq!(clause.text, "output remains stable");
+            assert!(clause.applies_to.is_empty());
+            let instance_key = "contract-clause-revalidated|contract.test#stable-output";
+            assert_eq!(clause.selected_for, [instance_key]);
+            assert_eq!(
+                context.instance_source_digests[instance_key]["contract.test"],
+                digest
+            );
+            app.add_evidence(json!({
+                "schema_version": "1", "id": "evidence.verify", "change_id": "change.verify",
+                "requirement_instances": [instance_key], "contract_clause_refs": [clause.clause_ref],
+                "git_revision": "revision-2", "method": "output regression test", "outcome": "passed", "summary": "Stable output verified",
+                "artifact": {"uri": "artifact://test/output", "digest": format!("sha256:{}", "f".repeat(64)), "exit_code": 0}
+            })).unwrap();
+            let refreshed = app.next("change.verify").unwrap();
+            let context = refreshed.context.unwrap();
+            let action = refreshed.decision.action.unwrap();
+            let instance = &action.requirement_instances[0];
+            let result = app.submit(&ResultSubmission {
+                change_id: "change.verify".to_owned(), action_id: action.id,
+                context_digest: context.digest, role: action.role, result_schema: action.expected_result_schema,
+                payload: json!({"outcomes": [{"instance_key": instance_key, "definition_digest": instance.definition_digest, "status": "satisfied", "summary": "Stable output verified", "basis_refs": ["contract.test", "evidence.verify"]}]}),
+                output_refs: vec!["evidence.verify".to_owned()], execution: None,
+            }).unwrap();
+            assert_eq!(result.decision.state, "ready-to-merge");
+        }
+    }
+
     #[test]
     fn reports_verified_stale_and_failed_without_mutating_contracts() {
         let verified = build_contract_health_report(
diff --git a/src/contract_scope.rs b/src/contract_scope.rs
index f4a1abf..eec79a0 100644
--- a/src/contract_scope.rs
+++ b/src/contract_scope.rs
@@ -69,9 +69,15 @@ pub(crate) fn contract_matches_subjects(contract: &Value, subjects: &BTreeSet<&s
         .as_array()
         .filter(|clauses| !clauses.is_empty())
     {
-        return clauses
-            .iter()
-            .any(|clause| clause_matches_subjects(contract, clause, subjects));
+        return clauses.iter().any(|clause| {
+            clause_matches_subjects(contract, clause, subjects)
+                || contract["id"]
+                    .as_str()
+                    .zip(clause["id"].as_str())
+                    .is_some_and(|(contract_id, clause_id)| {
+                        subjects.contains(format!("{contract_id}#{clause_id}").as_str())
+                    })
+        });
     }
     contract["applies_to"].as_array().is_some_and(|targets| {
         targets
diff --git a/src/project.rs b/src/project.rs
index 497efb0..0646fa4 100644
--- a/src/project.rs
+++ b/src/project.rs
@@ -58,7 +58,11 @@ pub fn build_project_snapshot(
         .get(change_id)
         .cloned()
         .ok_or_else(|| ProjectSnapshotError::new(format!("unknown change: {change_id}")))?;
-    let contracts = records_for_change(project, "contracts", change_id)?;
+    // Contracts are current project norms; change_id records their origin, not
+    // their applicability. Keep the same universe used by Contract Health and
+    // let Context selectors choose the clauses needed by each requirement.
+    let mut contracts = record_array(project, "contracts")?.to_vec();
+    contracts.sort_by(|left, right| left["id"].as_str().cmp(&right["id"].as_str()));
     let decisions = decision_records_for_change(project, change_id)?;
     let results = records_for_change(project, "results", change_id)?;
     let evidence = records_for_change(project, "evidence", change_id)?;
diff --git a/testdata/golden/v1/project-snapshot.json b/testdata/golden/v1/project-snapshot.json
index 774dc73..adac0ed 100644
--- a/testdata/golden/v1/project-snapshot.json
+++ b/testdata/golden/v1/project-snapshot.json
@@ -94,13 +94,14 @@
       "reverse_record_collections": true
     },
     {
-      "case_id": "accepted-decisions-remain-visible-across-changes",
+      "case_id": "contracts-and-accepted-decisions-remain-visible-across-changes",
       "change_id": "change.place-order",
       "append_unrelated_records": true,
       "expected": {
         "change_id": "change.place-order",
         "contract_ids": [
-          "contract.order-lifecycle"
+          "contract.order-lifecycle",
+          "contract.unrelated"
         ],
         "decision_ids": [
           "decision.order-model",
@@ -111,14 +112,16 @@
         "repository_phase": "pre-build",
         "artifact_digests": {
           "change.place-order": "sha256:c4bb2ccce8564e5ad8db5678d2a7a80d7898a6399ac81591284836b8c1bb42a6",
+          "code.order-events-publisher": "sha256:2222222222222222222222222222222222222222222222222222222222222222",
+          "code.place-order-handler": "sha256:1111111111111111111111111111111111111111111111111111111111111111",
           "contract.order-lifecycle": "sha256:9f6784558ea69ecb56694aa107f4fed8e17f727bbc2b6699cf95a7b0dac602a2",
           "contract.order-lifecycle#orders-source-of-truth": "sha256:24b95af486da75993c4b1788f7628d69ea588cd97bb0344aa054fdb4da1794a9",
+          "contract.unrelated": "sha256:5f44bd46933cf99596a69e16bab374b7d26f1f531850f88674241c82057a4735",
+          "contract.unrelated#unrelated-rule": "sha256:e4f93a742a60a2f84eab0a5df5a62b63b431f3e60f4b529f306e7505d70fadb5",
           "decision.order-model": "sha256:bec113df76236953ad3781f9c7069c51e7e4d5692db6de33cbb9dac91196bed3",
-          "decision.unrelated": "sha256:9be7d0d9979bb3fde5c321bb3196dfbcc591f089c51fe92b5b1eccb19e63437b",
-          "code.place-order-handler": "sha256:1111111111111111111111111111111111111111111111111111111111111111",
-          "code.order-events-publisher": "sha256:2222222222222222222222222222222222222222222222222222222222222222"
+          "decision.unrelated": "sha256:9be7d0d9979bb3fde5c321bb3196dfbcc591f089c51fe92b5b1eccb19e63437b"
         },
-        "digest": "sha256:a933c0ce3ca4144251042119831f963305529f38ecd9e14a05fe52ac0340e67a"
+        "digest": "sha256:ce439280584150d2c8a581885c902ae49474828d07d5ad1eb475dfc82b7f6661"
       }
     },
     {
@@ -128,6 +131,7 @@
       "expected": {
         "change_id": "change.retry-order-events",
         "contract_ids": [
+          "contract.order-lifecycle",
           "contract.shared-order-submission"
         ],
         "decision_ids": [
@@ -139,14 +143,16 @@
         "repository_phase": "pre-build",
         "artifact_digests": {
           "change.retry-order-events": "sha256:8f832211a911111b183b32fd0e7860abae6a19dd18bbf0888deef0f4b4780074",
+          "code.order-events-publisher": "sha256:2222222222222222222222222222222222222222222222222222222222222222",
+          "code.place-order-handler": "sha256:1111111111111111111111111111111111111111111111111111111111111111",
+          "contract.order-lifecycle": "sha256:9f6784558ea69ecb56694aa107f4fed8e17f727bbc2b6699cf95a7b0dac602a2",
+          "contract.order-lifecycle#orders-source-of-truth": "sha256:24b95af486da75993c4b1788f7628d69ea588cd97bb0344aa054fdb4da1794a9",
           "contract.shared-order-submission": "sha256:a399c87f66bb65966ace25c1006c9c534e47fb1473807e050c17c7f8bce67402",
           "contract.shared-order-submission#submission-result": "sha256:94dcaf2a94b5b9bf12ff174be3d390b312c1e1fac9768da80774337d0c72da26",
           "decision.order-model": "sha256:bec113df76236953ad3781f9c7069c51e7e4d5692db6de33cbb9dac91196bed3",
-          "decision.shared-order-submission": "sha256:d9fd5125b28863d8893f6658b4431a58210d676dfa9ec778ef6917e47b36a329",
-          "code.place-order-handler": "sha256:1111111111111111111111111111111111111111111111111111111111111111",
-          "code.order-events-publisher": "sha256:2222222222222222222222222222222222222222222222222222222222222222"
+          "decision.shared-order-submission": "sha256:d9fd5125b28863d8893f6658b4431a58210d676dfa9ec778ef6917e47b36a329"
         },
-        "digest": "sha256:7429588807261aada265b36fe0db5120c8ec535650bd4c257d8c6f9dfd16a0da"
+        "digest": "sha256:a4125c804a6a0b1a86b273326ecbfe16ad290533559beec95a95cc3f68f9e706"
       }
     }
   ],
diff --git a/tests/security_lifecycle.rs b/tests/security_lifecycle.rs
index e62db60..ae94a58 100644
--- a/tests/security_lifecycle.rs
+++ b/tests/security_lifecycle.rs
@@ -10,6 +10,15 @@ use std::process::{Command, Output};
 
 #[test]
 fn security_bindings_drive_the_reviewed_lifecycle() {
+    security_lifecycle(None);
+}
+
+#[test]
+fn cross_change_contracts_drive_the_reviewed_lifecycle() {
+    security_lifecycle(Some("change.previous"));
+}
+
+fn security_lifecycle(contract_origin: Option<&str>) {
     let manifest_root = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
     let fixture_root = manifest_root.join("testdata/fixtures/security-lifecycle");
     let scenario = read_yaml(fixture_root.join("scenario.yaml"));
@@ -33,6 +42,18 @@ fn security_bindings_drive_the_reviewed_lifecycle() {
         );
     }
     project["repository"] = pre_build_observation;
+    if let Some(origin) = contract_origin {
+        for contract in project["contracts"].as_array_mut().unwrap() {
+            contract["change_id"] = json!(origin);
+        }
+    }
+    project["contracts"].as_array_mut().unwrap().push(json!({
+        "schema_version": "1",
+        "id": "contract.unrelated",
+        "change_id": "change.other",
+        "applies_to": ["operation.unrelated"],
+        "clauses": [{"id": "unrelated", "text": "Unrelated operation preserves its output."}]
+    }));
 
     let change_id = scenario["change_id"].as_str().unwrap();
     let mut application =
@@ -150,6 +171,7 @@ fn security_bindings_drive_the_reviewed_lifecycle() {
         .unwrap();
 
     assert_action(&response, &scenario["after_build"][1]);
+    assert_revalidation_context(&application, change_id, &response);
     let revalidation_instances = response
         .decision
         .action
@@ -182,13 +204,9 @@ fn security_bindings_drive_the_reviewed_lifecycle() {
             }
         }))
         .unwrap();
-    let mut revalidation_payload = satisfied_payload(&response);
-    for outcome in revalidation_payload["outcomes"].as_array_mut().unwrap() {
-        outcome["basis_refs"]
-            .as_array_mut()
-            .unwrap()
-            .push(Value::String(revalidation_evidence_id.to_owned()));
-    }
+    response = application.next(change_id).unwrap();
+    assert_revalidation_context(&application, change_id, &response);
+    let revalidation_payload = satisfied_payload(&response);
     response = application
         .submit(&submission(
             &response,
@@ -212,6 +230,72 @@ fn security_bindings_drive_the_reviewed_lifecycle() {
     assert!(response.context.is_none());
 }
 
+fn assert_revalidation_context(
+    application: &InMemoryApplication<'_>,
+    change_id: &str,
+    response: &ApplicationResponse,
+) {
+    let snapshot = application.snapshot(change_id).unwrap();
+    let context = response.context.as_ref().unwrap();
+    assert!(
+        !context
+            .source_refs
+            .iter()
+            .any(|reference| reference.starts_with("contract.unrelated"))
+    );
+    assert!(
+        !context
+            .contract_clauses
+            .iter()
+            .any(|clause| clause.contract_id == "contract.unrelated")
+    );
+    for instance in &response
+        .decision
+        .action
+        .as_ref()
+        .unwrap()
+        .requirement_instances
+    {
+        let reference = instance.instance_key.split_once('|').unwrap().1;
+        let clause = context
+            .contract_clauses
+            .iter()
+            .find(|clause| clause.clause_ref == reference)
+            .unwrap();
+        assert!(clause.selected_for.contains(&instance.instance_key));
+        assert_eq!(clause.digest, snapshot.artifact_digests[reference]);
+        assert!(!clause.text.is_empty());
+        assert_eq!(clause.evidence_mode, "direct");
+        assert_eq!(
+            clause.authority_ref.as_deref(),
+            Some("decision.customer-security-boundary")
+        );
+        let contract = snapshot
+            .contracts
+            .iter()
+            .find(|contract| contract["id"] == clause.contract_id)
+            .unwrap();
+        assert_eq!(
+            serde_json::to_value(&clause.applies_to).unwrap(),
+            contract["clauses"]
+                .as_array()
+                .unwrap()
+                .iter()
+                .find(|item| item["id"] == clause.clause_id)
+                .unwrap()["applies_to"]
+        );
+        let sources = &context.instance_source_digests[&instance.instance_key];
+        assert_eq!(
+            sources[&clause.clause_ref],
+            snapshot.artifact_digests[&clause.clause_ref]
+        );
+        assert_eq!(
+            context.source_digests[&clause.clause_ref],
+            sources[&clause.clause_ref]
+        );
+    }
+}
+
 fn assert_action(response: &ApplicationResponse, expected: &Value) {
     assert_eq!(
         response.decision.state, expected["state"],