diff --git a/_project/resources/_src/Graph/Mutation.ts b/_project/resources/_src/Graph/Mutation.ts
new file mode 100644
index 000000000..8a5c1d9d5
--- /dev/null
+++ b/_project/resources/_src/Graph/Mutation.ts
@@ -0,0 +1,54 @@
+import { BlogPost } from "@effect-app-boilerplate/models/Blog"
+import { either } from "@effect-app/prelude/schema"
+import { CreatePost } from "../Blog.js"
+import { MutationErrors } from "../errors.js"
+import { GraphQueryRequest, GraphQueryResponse } from "./Query.js"
+import { makeMutationInput } from "./utils.js"
+
+const makeMutationInput_ = makeMutationInput(GraphQueryRequest.Api.props)
+
+// TODO: Add The follow-up Graph Query
+// - parse inputs, when string and starts with $, take from mutation output.
+@useClassNameForSchema
+@allowAnonymous
+@allowRoles("user")
+export class GraphMutationRequest extends Post("/graph/mutate")<GraphMutationRequest>()(
+  {
+    CreatePost: optProp(
+      makeMutationInput_(CreatePost.CreatePostRequest)
+    )
+    // UpdatePurchaseOrder: optProp(
+    //   makeMutationInput_(PurchaseOrders.Update.UpdatePurchaseOrderRequest)
+    // )
+  }
+) {}
+
+const PostResult = props({
+  ...GraphQueryResponse.Api.props,
+  result: optProp(BlogPost)
+})
+
+@useClassNameForSchema
+export class GraphMutationResponse extends Model<GraphMutationResponse>()({
+  // TODO: Support guaranteed optional sub-queries, like on Create/Update of PO
+  // guarantee an optional return of PurchaseOrder
+  // first must enable PO cache for guarantee.
+  CreatePost: optProp(
+    either(
+      MutationErrors,
+      props({
+        response: prop(CreatePost.CreatePostResponse),
+        query: optProp(PostResult)
+      })
+    )
+  )
+  // UpdatePurchaseOrder: optProp(
+  //   either(
+  //     MutationErrors,
+  //     props({
+  //       response: optProp(Void),
+  //       query: optProp(POResult)
+  //     })
+  //   )
+  // )
+}) {}
diff --git a/_project/resources/_src/Graph/Query.ts b/_project/resources/_src/Graph/Query.ts
new file mode 100644
index 000000000..6069de284
--- /dev/null
+++ b/_project/resources/_src/Graph/Query.ts
@@ -0,0 +1,39 @@
+import { either } from "@effect-app/prelude/schema"
+import { QueryErrors } from "../errors.js"
+import { BlogRsc } from "../index.js"
+import { makeInput } from "./utils.js"
+
+@useClassNameForSchema
+@allowAnonymous
+@allowRoles("user")
+export class GraphQueryRequest extends Post("/graph/query")<GraphQueryRequest>()({
+  // AllMe: optProp(makeInput(Me.All.GetMeRequest, true)),
+  // AllMeEventlog: optProp(makeInput(Me.Eventlog.AllMeEventlogRequest, true)),
+  // AllMeChangeRequests: optProp(
+  //   makeInput(Me.ChangeRequests.AllMeChangeRequestsRequest, true)
+  // ),
+  // AllMeCommentActivity: optProp(
+  //   makeInput(Me.CommentActivity.AllMeCommentActivityRequest, true)
+  // ),
+  // AllMeTasks: optProp(makeInput(Me.Tasks.AllMeTasksRequest, true)),
+
+  FindBlogPost: optProp(makeInput(BlogRsc.FindPost.FindPostRequest)),
+  GetAllBlogPosts: optProp(makeInput(BlogRsc.GetPosts.GetPostsRequest))
+}) {}
+
+@useClassNameForSchema
+export class GraphQueryResponse extends Model<GraphQueryResponse>()({
+  // AllMe: optProp(either(QueryErrors, Me.All.GetMeResponse)),
+  // AllMeEventlog: optProp(either(QueryErrors, Me.Eventlog.AllMeEventlogResponse)),
+  // AllMeChangeRequests: optProp(
+  //   either(QueryErrors, Me.ChangeRequests.AllMeChangeRequestsResponse)
+  // ),
+  // AllMeCommentActivity: optProp(
+  //   either(QueryErrors, Me.CommentActivity.AllMeCommentActivityResponse)
+  // ),
+  // AllMeTasks: optProp(either(QueryErrors, Me.Tasks.AllMeTasksResponse)),
+
+  FindBlogPost: optProp(
+    either(QueryErrors, BlogRsc.FindPost.FindPostResponse)
+  )
+}) {}
diff --git a/_project/resources/_src/Graph/utils.ts b/_project/resources/_src/Graph/utils.ts
new file mode 100644
index 000000000..91ddf17a2
--- /dev/null
+++ b/_project/resources/_src/Graph/utils.ts
@@ -0,0 +1,23 @@
+import type { Property, PropertyRecord, SchemaAny, SchemaProperties } from "@effect-app/prelude/schema"
+
+export function makeInput<Self extends SchemaAny>(
+  a: Self
+): SchemaProperties<{
+  input: Property<Self, "required", None, None>
+}>
+export function makeInput<Self extends SchemaAny>(
+  a: Self,
+  noInput: true
+): SchemaProperties<{
+  input: Property<Self, "optional", None, None>
+}>
+export function makeInput<Self extends SchemaAny>(a: Self, noInput?: boolean): any {
+  return props(noInput ? { input: optProp(a) } : { input: prop(a) })
+}
+
+export function makeMutationInput<Props extends PropertyRecord>(baseSchemaProps: Props) {
+  return <Self extends SchemaAny>(a: Self) => {
+    const query = props({ ...baseSchemaProps, result: optProp(bool) })
+    return props({ input: prop(a), query: optProp(query) })
+  }
+}
diff --git a/_project/resources/_src/errors.ts b/_project/resources/_src/errors.ts
new file mode 100644
index 000000000..7c3a01c87
--- /dev/null
+++ b/_project/resources/_src/errors.ts
@@ -0,0 +1,70 @@
+@useClassNameForSchema
+export class NotFoundError extends Model<NotFoundError>()({
+  _tag: prop(literal("NotFoundError")),
+  message: prop(string)
+}) {}
+
+@useClassNameForSchema
+export class InvalidStateError extends Model<InvalidStateError>()({
+  _tag: prop(literal("InvalidStateError")),
+  message: prop(string)
+}) {}
+
+@useClassNameForSchema
+export class ValidationError extends Model<ValidationError>()({
+  _tag: prop(literal("ValidationError")),
+  errors: prop(array(unknown)) // meh
+}) {}
+
+@useClassNameForSchema
+export class NotLoggedInError extends Model<NotLoggedInError>()({
+  _tag: prop(literal("NotLoggedInError"))
+}) {}
+
+@useClassNameForSchema
+export class UnauthorizedError extends Model<UnauthorizedError>()({
+  _tag: prop(literal("UnauthorizedError"))
+}) {}
+
+@useClassNameForSchema
+export class OptimisticConcurrencyException extends Model<OptimisticConcurrencyException>()(
+  {
+    _tag: prop(literal("OptimisticConcurrencyException"))
+  }
+) {}
+
+const MutationOnlyErrors = {
+  InvalidStateError,
+  OptimisticConcurrencyException
+}
+
+const GeneralErrors = {
+  NotFoundError,
+  NotLoggedInError,
+  UnauthorizedError,
+  ValidationError
+}
+
+export const SupportedErrors = union({
+  ...MutationOnlyErrors,
+  ...GeneralErrors
+})
+  ["|>"](named("SupportedErrors"))
+  ["|>"](withDefaults)
+export type SupportedErrors = ParsedShapeOf<typeof SupportedErrors>
+
+// ideal?
+// export const QueryErrors = union({ ...GeneralErrors })
+//   ["|>"](named("QueryErrors"))
+//   ["|>"](withDefaults)
+// export type QueryErrors = ParsedShapeOf<typeof QueryErrors>
+// export const MutationErrors = union({ ...GeneralErrors, ...GeneralErrors })
+//   ["|>"](named("MutationErrors"))
+//   ["|>"](withDefaults)
+
+// export type MutationErrors = ParsedShapeOf<typeof MutationErrors>
+
+export const MutationErrors = SupportedErrors
+export const QueryErrors = SupportedErrors
+export type MutationErrors = ParsedShapeOf<typeof MutationErrors>
+export type QueryErrors = ParsedShapeOf<typeof QueryErrors>