diff --git a/apps/loopover-ui/public/openapi.json b/apps/loopover-ui/public/openapi.json
index bd67835359..e02de53d98 100644
--- a/apps/loopover-ui/public/openapi.json
+++ b/apps/loopover-ui/public/openapi.json
@@ -16134,6 +16134,57 @@
             ]
           }
         }
+      },
+      "ContributorWatchRequest": {
+        "type": "object",
+        "properties": {
+          "repoFullName": {
+            "type": "string",
+            "minLength": 3,
+            "maxLength": 200
+          },
+          "labels": {
+            "type": "array",
+            "items": {
+              "type": "string",
+              "minLength": 1,
+              "maxLength": 100
+            },
+            "maxItems": 50
+          }
+        },
+        "required": [
+          "repoFullName"
+        ]
+      },
+      "ContributorWatchesResponse": {
+        "type": "object",
+        "properties": {
+          "watching": {
+            "type": "array",
+            "items": {
+              "type": "object",
+              "properties": {
+                "repoFullName": {
+                  "type": "string"
+                },
+                "labels": {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              },
+              "required": [
+                "repoFullName",
+                "labels"
+              ]
+            }
+          },
+          "changed": {
+            "type": "string"
+          }
+        }
       }
     },
     "parameters": {},
@@ -21768,6 +21819,149 @@
           }
         ]
       }
+    },
+    "/v1/contributors/{login}/watches": {
+      "get": {
+        "summary": "List contributor issue-watch subscriptions — REST mirror of loopover_watch_issues action=list (#9306)",
+        "parameters": [
+          {
+            "schema": {
+              "type": "string"
+            },
+            "required": true,
+            "name": "login",
+            "in": "path"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "The contributor's own issue-watch subscriptions (self-scoped) — mirrors loopover_watch_issues action=list",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ContributorWatchesResponse"
+                }
+              }
+            }
+          },
+          "401": {
+            "description": "Missing or invalid authentication"
+          },
+          "403": {
+            "description": "Authenticated principal cannot access this contributor's watches"
+          }
+        },
+        "security": [
+          {
+            "LoopOverBearer": []
+          },
+          {
+            "LoopOverSessionCookie": []
+          }
+        ]
+      },
+      "post": {
+        "summary": "Subscribe to a repo's new issues — REST mirror of loopover_watch_issues action=watch (#9306)",
+        "parameters": [
+          {
+            "schema": {
+              "type": "string"
+            },
+            "required": true,
+            "name": "login",
+            "in": "path"
+          }
+        ],
+        "requestBody": {
+          "content": {
+            "application/json": {
+              "schema": {
+                "$ref": "#/components/schemas/ContributorWatchRequest"
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "Updated watch list after subscribing — mirrors loopover_watch_issues action=watch",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ContributorWatchesResponse"
+                }
+              }
+            }
+          },
+          "400": {
+            "description": "Invalid watch request body"
+          },
+          "401": {
+            "description": "Missing or invalid authentication"
+          },
+          "403": {
+            "description": "Authenticated principal cannot watch this repo or contributor"
+          }
+        },
+        "security": [
+          {
+            "LoopOverBearer": []
+          },
+          {
+            "LoopOverSessionCookie": []
+          }
+        ]
+      },
+      "delete": {
+        "summary": "Unsubscribe from a repo's issue watches — REST mirror of loopover_watch_issues action=unwatch (#9306)",
+        "parameters": [
+          {
+            "schema": {
+              "type": "string"
+            },
+            "required": true,
+            "name": "login",
+            "in": "path"
+          }
+        ],
+        "requestBody": {
+          "content": {
+            "application/json": {
+              "schema": {
+                "$ref": "#/components/schemas/ContributorWatchRequest"
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "Updated watch list after unsubscribing — mirrors loopover_watch_issues action=unwatch",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ContributorWatchesResponse"
+                }
+              }
+            }
+          },
+          "400": {
+            "description": "Invalid unwatch request body"
+          },
+          "401": {
+            "description": "Missing or invalid authentication"
+          },
+          "403": {
+            "description": "Authenticated principal cannot unwatch this repo or contributor"
+          }
+        },
+        "security": [
+          {
+            "LoopOverBearer": []
+          },
+          {
+            "LoopOverSessionCookie": []
+          }
+        ]
+      }
     }
   },
   "servers": [
diff --git a/src/mcp/server.ts b/src/mcp/server.ts
index fde2cb0cbd..a46341b2a0 100644
--- a/src/mcp/server.ts
+++ b/src/mcp/server.ts
@@ -1536,7 +1536,7 @@ const watchIssuesShape = {
   labels: z.array(z.string().min(1).max(100)).max(50).optional(),
 };
 
-const watchIssuesOutputSchema = {
+export const watchIssuesOutputSchema = {
   watching: z.array(z.object({ repoFullName: z.string(), labels: z.array(z.string()) })).optional(),
   changed: z.string().optional(),
 };
diff --git a/src/openapi/schemas.ts b/src/openapi/schemas.ts
index 5ed13dd4b9..f5b5912e0b 100644
--- a/src/openapi/schemas.ts
+++ b/src/openapi/schemas.ts
@@ -539,6 +539,28 @@ export const NotificationsMarkedSchema = z
   })
   .openapi("NotificationsMarked");
 
+/**
+ * Request body for POST/DELETE /v1/contributors/{login}/watches. Mirrors `watchSubscriptionBodySchema`
+ * in src/api/routes.ts (repoFullName + optional labels) — #9306.
+ */
+export const ContributorWatchRequestSchema = z
+  .object({
+    repoFullName: z.string().min(3).max(200),
+    labels: z.array(z.string().min(1).max(100)).max(50).optional(),
+  })
+  .openapi("ContributorWatchRequest");
+
+/**
+ * Response body for GET/POST/DELETE /v1/contributors/{login}/watches. Field-level parity with
+ * `watchIssuesOutputSchema` (the `loopover_watch_issues` MCP tool `outputSchema`) — #9306.
+ */
+export const ContributorWatchesResponseSchema = z
+  .object({
+    watching: z.array(z.object({ repoFullName: z.string(), labels: z.array(z.string()) })).optional(),
+    changed: z.string().optional(),
+  })
+  .openapi("ContributorWatchesResponse");
+
 export const ContributorOpportunitySchema = z
   .object({
     repoFullName: z.string(),
diff --git a/src/openapi/spec.ts b/src/openapi/spec.ts
index 1b0df5732d..82017d6d72 100644
--- a/src/openapi/spec.ts
+++ b/src/openapi/spec.ts
@@ -27,6 +27,8 @@ import {
   ContributorPrOutcomesSchema,
   NotificationFeedSchema,
   NotificationsMarkedSchema,
+  ContributorWatchRequestSchema,
+  ContributorWatchesResponseSchema,
   ContributorRewardRiskStrategySchema,
   ContributorProfileSchema,
   ContributorScoringProfileSchema,
@@ -150,6 +152,8 @@ export function buildOpenApiSpec() {
   registry.register("ContributorOutcomeHistory", ContributorOutcomeHistorySchema);
   registry.register("ContributorPatternReport", ContributorPatternReportSchema);
   registry.register("ContributorDecisionPack", ContributorDecisionPackSchema);
+  registry.register("ContributorWatchRequest", ContributorWatchRequestSchema);
+  registry.register("ContributorWatchesResponse", ContributorWatchesResponseSchema);
   registry.register("DecisionPackRefreshNeeded", DecisionPackRefreshNeededSchema);
   registry.register("RepoDecisionResponse", RepoDecisionResponseSchema);
   registry.register("RepoIntelligence", RepoIntelligenceSchema);
@@ -1281,6 +1285,60 @@ export function buildOpenApiSpec() {
       400: { description: "Invalid mark-read body" },
     },
   });
+  registry.registerPath({
+    method: "get",
+    path: "/v1/contributors/{login}/watches",
+    summary: "List contributor issue-watch subscriptions — REST mirror of loopover_watch_issues action=list (#9306)",
+    request: { params: z.object({ login: z.string() }) },
+    responses: {
+      200: {
+        description: "The contributor's own issue-watch subscriptions (self-scoped) — mirrors loopover_watch_issues action=list",
+        content: { "application/json": { schema: ContributorWatchesResponseSchema } },
+      },
+      401: { description: "Missing or invalid authentication" },
+      403: { description: "Authenticated principal cannot access this contributor's watches" },
+    },
+  });
+  registry.registerPath({
+    method: "post",
+    path: "/v1/contributors/{login}/watches",
+    summary: "Subscribe to a repo's new issues — REST mirror of loopover_watch_issues action=watch (#9306)",
+    request: {
+      params: z.object({ login: z.string() }),
+      body: {
+        content: { "application/json": { schema: ContributorWatchRequestSchema } },
+      },
+    },
+    responses: {
+      200: {
+        description: "Updated watch list after subscribing — mirrors loopover_watch_issues action=watch",
+        content: { "application/json": { schema: ContributorWatchesResponseSchema } },
+      },
+      400: { description: "Invalid watch request body" },
+      401: { description: "Missing or invalid authentication" },
+      403: { description: "Authenticated principal cannot watch this repo or contributor" },
+    },
+  });
+  registry.registerPath({
+    method: "delete",
+    path: "/v1/contributors/{login}/watches",
+    summary: "Unsubscribe from a repo's issue watches — REST mirror of loopover_watch_issues action=unwatch (#9306)",
+    request: {
+      params: z.object({ login: z.string() }),
+      body: {
+        content: { "application/json": { schema: ContributorWatchRequestSchema } },
+      },
+    },
+    responses: {
+      200: {
+        description: "Updated watch list after unsubscribing — mirrors loopover_watch_issues action=unwatch",
+        content: { "application/json": { schema: ContributorWatchesResponseSchema } },
+      },
+      400: { description: "Invalid unwatch request body" },
+      401: { description: "Missing or invalid authentication" },
+      403: { description: "Authenticated principal cannot unwatch this repo or contributor" },
+    },
+  });
   registry.registerPath({
     method: "get",
     path: "/v1/contributors/{login}/repos/{owner}/{repo}/decision",
diff --git a/test/unit/openapi.test.ts b/test/unit/openapi.test.ts
index f3d000bb25..edf924302d 100644
--- a/test/unit/openapi.test.ts
+++ b/test/unit/openapi.test.ts
@@ -21,6 +21,7 @@ import {
   gatePrecisionOutputSchema,
   maintainerMeasurementReportOutputSchema,
   activationPreviewOutputSchema,
+  watchIssuesOutputSchema,
 } from "../../src/mcp/server";
 
 describe("OpenAPI contract", () => {
@@ -53,6 +54,7 @@ describe("OpenAPI contract", () => {
     expect(spec.paths["/v1/contributors/{login}/decision-pack"]).toBeDefined();
     expect(spec.paths["/v1/contributors/{login}/open-pr-monitor"]).toBeDefined();
     expect(spec.paths["/v1/contributors/{login}/pr-outcomes"]).toBeDefined();
+    expect(spec.paths["/v1/contributors/{login}/watches"]).toBeDefined();
     expect(spec.paths["/v1/contributors/{login}/repos/{owner}/{repo}/decision"]).toBeDefined();
     expect(spec.paths["/v1/preflight/pr"]).toBeDefined();
     expect(spec.paths["/v1/preflight/review-risk"]).toBeDefined();
@@ -455,6 +457,30 @@ describe("OpenAPI contract", () => {
     }
   });
 
+  // #9306: GET/POST/DELETE /v1/contributors/{login}/watches are the REST mirror of loopover_watch_issues
+  // but were missing from the OpenAPI contract. Assert all three verbs are documented with a response
+  // component whose keys match watchIssuesOutputSchema, and POST/DELETE carry the watch request body.
+  it("documents contributor watches GET/POST/DELETE with tool-parity schemas (#9306)", () => {
+    const spec = buildOpenApiSpec();
+    const schemas = spec.components?.schemas ?? {};
+    const path = "/v1/contributors/{login}/watches";
+
+    const propKeys = (name: string) =>
+      Object.keys((schemas[name] as { properties?: Record<string, unknown> }).properties ?? {}).sort();
+
+    expect(spec.paths[path]?.get).toBeDefined();
+    expect(spec.paths[path]?.post).toBeDefined();
+    expect(spec.paths[path]?.delete).toBeDefined();
+
+    expect(schemas.ContributorWatchesResponse).toBeDefined();
+    expect(schemas.ContributorWatchRequest).toBeDefined();
+    expect(propKeys("ContributorWatchesResponse")).toEqual(Object.keys(watchIssuesOutputSchema).sort());
+    expect(propKeys("ContributorWatchRequest")).toEqual(["labels", "repoFullName"].sort());
+
+    expect(spec.paths[path]?.post?.requestBody).toBeDefined();
+    expect(spec.paths[path]?.delete?.requestBody).toBeDefined();
+  });
+
   it("declares an `in: path` parameter for every {templated} path segment (Cloudflare schema-validation warning 30046)", () => {
     const spec = buildOpenApiSpec();
     for (const [path, methods] of Object.entries(spec.paths ?? {})) {