diff --git a/.gitignore b/.gitignore
index b2b198d..b49260d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,9 @@ release-source/
 .tmp/
 *.log
 .DS_Store
+
+.tmp-gh-*.ps1
+
+.tmp-venv*/
+
+TestResults/
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39f5ef0..19c9d90 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,8 @@ All notable changes follow Semantic Versioning and Keep a Changelog conventions.
 - Conservative automated JSON Schema compatibility classification in pull-request CI.
 - Deterministic schema registry packaging and release-triggered GitHub Pages distribution.
 - Stable major/minor and immutable patch-version schema URL contracts with SHA-256 manifests.
+- `failure-state.schema.json` for typed failure-state payloads in the v1.1 contract line.
+- Shared `failureClass` enum in `schemas/v1.1/common.schema.json` for cross-runtime failure classification.
 
 ## [1.1.1] - 2026-07-05
 
diff --git a/docs/VERSIONING.md b/docs/VERSIONING.md
index cef129e..5a6af70 100644
--- a/docs/VERSIONING.md
+++ b/docs/VERSIONING.md
@@ -56,3 +56,13 @@ The classifier reports:
 - `review_required`: changed semantics that cannot be classified safely by the automated rules.
 
 Both `breaking` and `review_required` exit nonzero. A `review_required` result must be resolved by simplifying the change, extending classifier coverage with tests, or obtaining explicit maintainer review. Automation never treats an unknown semantic change as compatible.
+
+## v1.1 FailureState Addition
+
+The `FailureState` contract added to the v1.1 line is a minor, additive change.
+
+- It introduces a new schema file: `schemas/v1.1/failure-state.schema.json`.
+- It adds a shared `failureClass` enum definition to `schemas/v1.1/common.schema.json`.
+- It does not remove or rename any existing schema, required property, or accepted enum value in previously published contracts.
+
+Existing v1.1 payloads remain valid, and consumers can adopt `FailureState` incrementally.
diff --git a/examples/v1.1/failure-state.json b/examples/v1.1/failure-state.json
new file mode 100644
index 0000000..fb02d6e
--- /dev/null
+++ b/examples/v1.1/failure-state.json
@@ -0,0 +1,27 @@
+{
+  "kind": "FailureState",
+  "correlationId": "corr-20260707-001",
+  "promptId": "prompt-typed-failure-001",
+  "runId": "run-typed-failure-001",
+  "repo": "Coding-Autopilot-System/gsd-orchestrator",
+  "actor": { "id": "gsd-orchestrator", "type": "workflow" },
+  "timestamp": "2026-07-07T09:45:00Z",
+  "schemaVersion": "1.1.0",
+  "traceContext": { "traceparent": "00-4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-01" },
+  "failureClass": "transient",
+  "component": "gsd-orchestrator.LoopCoordinator",
+  "message": "MAF worker process exited with code 1",
+  "retryable": true,
+  "exceptionType": "System.InvalidOperationException",
+  "causeChain": [
+    "MAF worker failed with exit code 1: connection refused",
+    "ConnectionRefusedError: [Errno 111] Connection refused"
+  ],
+  "retryAfterSeconds": 5,
+  "evidence": [
+    {
+      "kind": "log",
+      "uri": "https://coding-autopilot-system.github.io/cas-contracts/examples/v1.1/failure-state.json"
+    }
+  ]
+}
diff --git a/schemas/v1.1/common.schema.json b/schemas/v1.1/common.schema.json
index b23a790..5ee6af1 100644
--- a/schemas/v1.1/common.schema.json
+++ b/schemas/v1.1/common.schema.json
@@ -98,6 +98,16 @@
         "waiting",
         "terminal"
       ]
+    },
+    "failureClass": {
+      "type": "string",
+      "enum": [
+        "transient",
+        "deterministic",
+        "policy",
+        "cancellation",
+        "unrecoverable"
+      ]
     }
   }
 }
diff --git a/schemas/v1.1/failure-state.schema.json b/schemas/v1.1/failure-state.schema.json
new file mode 100644
index 0000000..3b902c6
--- /dev/null
+++ b/schemas/v1.1/failure-state.schema.json
@@ -0,0 +1,37 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://schemas.coding-autopilot.dev/v1.1/failure-state.schema.json",
+  "title": "FailureState",
+  "type": "object",
+  "allOf": [
+    { "$ref": "common.schema.json#/$defs/lifecycleMetadata" },
+    {
+      "type": "object",
+      "required": [
+        "kind",
+        "failureClass",
+        "component",
+        "message",
+        "retryable"
+      ],
+      "properties": {
+        "kind": { "const": "FailureState" },
+        "failureClass": { "$ref": "common.schema.json#/$defs/failureClass" },
+        "component": { "type": "string", "minLength": 1, "maxLength": 256 },
+        "message": { "type": "string", "minLength": 1, "maxLength": 5000 },
+        "retryable": { "type": "boolean" },
+        "exceptionType": { "type": "string", "maxLength": 256 },
+        "causeChain": {
+          "type": "array",
+          "items": { "type": "string", "maxLength": 1000 }
+        },
+        "retryAfterSeconds": { "type": "number", "minimum": 0 },
+        "evidence": {
+          "type": "array",
+          "items": { "$ref": "common.schema.json#/$defs/evidence" }
+        }
+      }
+    }
+  ],
+  "unevaluatedProperties": false
+}
diff --git a/tests/contracts.test.mjs b/tests/contracts.test.mjs
index 8e97583..275ae76 100644
--- a/tests/contracts.test.mjs
+++ b/tests/contracts.test.mjs
@@ -105,3 +105,23 @@ test("v1.1 SDLC request rejects missing profile version", () => {
   assert.equal(validate(request), false);
   assert.match(ajv.errorsText(validate.errors), /profileVersion/);
 });
+
+test("v1.1 FailureState example satisfies the authoritative schema", () => {
+  const examplePath = `${exampleRoot}/v1.1/failure-state.json`;
+  const validate = ajv.getSchema(schemaIdForExample(examplePath));
+  const example = examples.find((record) => record.kind === "FailureState" && record.schemaVersion === "1.1.0");
+
+  assert.ok(validate, "v1.1 failure-state schema is registered");
+  assert.ok(example, "v1.1 FailureState example exists");
+  assert.equal(validate(example), true, ajv.errorsText(validate.errors));
+});
+
+test("v1.1 FailureState rejects missing failureClass", () => {
+  const example = structuredClone(examples.find((record) => record.kind === "FailureState" && record.schemaVersion === "1.1.0"));
+  const validate = ajv.getSchema(schemaId("v1.1", "failure-state"));
+  delete example.failureClass;
+
+  assert.ok(validate, "v1.1 failure-state schema is registered");
+  assert.equal(validate(example), false);
+  assert.match(ajv.errorsText(validate.errors), /failureClass/);
+});
diff --git a/tests/registry.test.mjs b/tests/registry.test.mjs
index 7b9abb2..f376186 100644
--- a/tests/registry.test.mjs
+++ b/tests/registry.test.mjs
@@ -88,5 +88,5 @@ test("registry all-mode publishes all lines without replacing any", async () =>
   assert.deepEqual(index.lines, { "v0.1": "0.1.0", "v1.0": "1.0.0", "v1.1": "1.1.0" });
   assert.equal((await readJson(path.join(output, "v0.1", "manifest.json"))).schemas.length, 8);
   assert.equal((await readJson(path.join(output, "v1.0", "manifest.json"))).schemas.length, 8);
-  assert.equal((await readJson(path.join(output, "v1.1", "manifest.json"))).schemas.length, 6);
+  assert.equal((await readJson(path.join(output, "v1.1", "manifest.json"))).schemas.length, 7);
 });