diff --git a/server/src/__tests__/environment-selection-route-guards.test.ts b/server/src/__tests__/environment-selection-route-guards.test.ts
index 468afa571f3..8fa547b31e1 100644
--- a/server/src/__tests__/environment-selection-route-guards.test.ts
+++ b/server/src/__tests__/environment-selection-route-guards.test.ts
@@ -62,6 +62,12 @@ vi.mock("../services/index.js", () => ({
   workspaceOperationService: () => ({}),
   accessService: () => ({
     canUser: vi.fn(),
+    decide: vi.fn(async (input: { action: string }) => ({
+      allowed: input.action === "project:read",
+      action: input.action,
+      reason: input.action === "project:read" ? "allow_explicit_grant" : "deny_missing_grant",
+      explanation: input.action === "project:read" ? "Allowed by test default." : "Missing permission.",
+    })),
     hasPermission: vi.fn(),
   }),
   agentService: () => ({
diff --git a/server/src/__tests__/issue-agent-mutation-ownership-routes.test.ts b/server/src/__tests__/issue-agent-mutation-ownership-routes.test.ts
index 5045c9fea10..1883b842c3e 100644
--- a/server/src/__tests__/issue-agent-mutation-ownership-routes.test.ts
+++ b/server/src/__tests__/issue-agent-mutation-ownership-routes.test.ts
@@ -222,7 +222,9 @@ function registerRouteMocks() {
     issueThreadInteractionService: () => mockIssueThreadInteractionService,
     taskWatchdogService: () => mockTaskWatchdogService,
     logActivity: mockLogActivity,
-    projectService: () => ({}),
+    projectService: () => ({
+      getById: vi.fn(async (id: string) => ({ id, companyId })),
+    }),
     routineService: () => ({
       syncRunStatusForIssue: vi.fn(async () => undefined),
     }),
@@ -387,14 +389,16 @@ describe("agent issue mutation checkout ownership", () => {
         input.action === "issue:comment" ||
         input.action === "issue:read" ||
         input.action === "issue:mutate" ||
-        input.action === "company_scope:read",
+        input.action === "company_scope:read" ||
+        input.action === "project:read",
       action: input.action,
       reason:
         input.action === "tasks:assign" ||
           input.action === "issue:comment" ||
           input.action === "issue:read" ||
           input.action === "issue:mutate" ||
-          input.action === "company_scope:read"
+          input.action === "company_scope:read" ||
+          input.action === "project:read"
           ? "allow_explicit_grant"
           : "deny_missing_grant",
       explanation:
@@ -402,7 +406,8 @@ describe("agent issue mutation checkout ownership", () => {
           input.action === "issue:comment" ||
           input.action === "issue:read" ||
           input.action === "issue:mutate" ||
-          input.action === "company_scope:read"
+          input.action === "company_scope:read" ||
+          input.action === "project:read"
           ? "Allowed by test default."
           : "Missing permission.",
     }));
diff --git a/server/src/routes/openapi.ts b/server/src/routes/openapi.ts
index 7d46b656cab..7afcd0fa8b9 100644
--- a/server/src/routes/openapi.ts
+++ b/server/src/routes/openapi.ts
@@ -39,6 +39,7 @@ import {
   // Project
   createProjectSchema,
   updateProjectSchema,
+  addProjectAccessMemberSchema,
   createProjectWorkspaceSchema,
   updateProjectWorkspaceSchema,
   // Company
@@ -776,6 +777,8 @@ const BOARD_ONLY_OPERATIONS = new Set([
   "PUT /api/companies/{companyId}/resource-memberships/me/agents/{agentId}",
   "PUT /api/companies/{companyId}/resource-memberships/me/documents/{documentId}",
   "PUT /api/companies/{companyId}/resource-memberships/me/projects/{projectId}",
+  "POST /api/projects/{id}/access-members",
+  "DELETE /api/projects/{id}/access-members/{memberId}",
   "GET /api/companies/{companyId}/secret-provider-configs",
   "POST /api/companies/{companyId}/secret-provider-configs",
   "GET /api/companies/{companyId}/secret-providers/health",
@@ -924,6 +927,7 @@ const CREATED_OPERATIONS = new Set([
   "POST /api/issues/{id}/comments",
   "POST /api/companies/{companyId}/issues/{issueId}/attachments",
   "POST /api/companies/{companyId}/projects",
+  "POST /api/projects/{id}/access-members",
   "POST /api/projects/{id}/workspaces",
   "POST /api/companies/{companyId}/routines",
   "POST /api/companies/{companyId}/folders",
@@ -2571,6 +2575,49 @@ registry.registerPath({
   responses: { 200: r.ok(), 401: r.unauthorized },
 });
 
+registry.registerPath({
+  method: "get",
+  path: "/api/projects/{id}/access-members",
+  tags: ["projects"],
+  summary: "List project access members",
+  request: { params: z.object({ id: z.string() }) },
+  responses: { 200: r.ok(), 401: r.unauthorized, 403: r.forbidden, 404: r.notFound },
+});
+
+registry.registerPath({
+  method: "post",
+  path: "/api/projects/{id}/access-members",
+  tags: ["projects"],
+  summary: "Add a project access member",
+  request: {
+    params: z.object({ id: z.string() }),
+    body: jsonBody(addProjectAccessMemberSchema),
+  },
+  responses: {
+    201: r.ok(),
+    400: r.badRequest,
+    401: r.unauthorized,
+    403: r.forbidden,
+    404: r.notFound,
+    422: r.unprocessable,
+  },
+});
+
+registry.registerPath({
+  method: "delete",
+  path: "/api/projects/{id}/access-members/{memberId}",
+  tags: ["projects"],
+  summary: "Remove a project access member",
+  request: { params: z.object({ id: z.string(), memberId: z.string() }) },
+  responses: {
+    200: r.ok(),
+    401: r.unauthorized,
+    403: r.forbidden,
+    404: r.notFound,
+    422: r.unprocessable,
+  },
+});
+
 registry.registerPath({
   method: "get",
   path: "/api/projects/{id}/workspaces",