diff --git a/plugins/hardcover/index.test.ts b/plugins/hardcover/index.test.ts
new file mode 100644
index 0000000..643b6e6
--- /dev/null
+++ b/plugins/hardcover/index.test.ts
@@ -0,0 +1,155 @@
+import { describe, expect, test } from "bun:test";
+import { HttpError } from "@sttracker/plugin-sdk/http";
+import { collect, createFixtureHttp, createTestContext } from "@sttracker/plugin-sdk/testing";
+import plugin from "./index.ts";
+import { PAGE_SIZE } from "./src/graphql.ts";
+
+const short = await Bun.file(new URL("./test/fixtures/page-short.json", import.meta.url)).json();
+const lists = await Bun.file(new URL("./test/fixtures/lists.json", import.meta.url)).json();
+const errors = await Bun.file(new URL("./test/fixtures/errors.json", import.meta.url)).json();
+const URL_ = "POST https://api.hardcover.app/v1/graphql";
+
+type Body = { query: string; variables: { offset?: number; where?: unknown } };
+function ctxFor(userBooks: (b: Body) => unknown) {
+  const calls: Body[] = [];
+  const fetchImpl = (async (input: RequestInfo | URL, init?: RequestInit) => {
+    const body = JSON.parse(String(init?.body)) as Body;
+    calls.push(body);
+    const out = body.query.includes("query Lists") ? lists : userBooks(body);
+    const inner = createFixtureHttp({ [URL_]: out });
+    return inner.fetch(input, init);
+  }) as typeof fetch;
+  return { ctx: createTestContext({ fetch: fetchImpl, config: { token: "tok" } }), calls };
+}
+
+describe("hardcover pull", () => {
+  test("maps status, rating, series parent, favorite", async () => {
+    const { ctx } = ctxFor(() => short);
+    const recs = await collect(plugin.pull!(ctx));
+    const e = recs.find((r) => r.key === "ub:1");
+    if (e?.kind !== "entry") throw new Error("no entry");
+    expect(e.entry).toMatchObject({ status: "completed", rating: 90, review: "Great", notes: "lent to Sam", favorite: true });
+    expect(e.work.externalIds).toEqual({ hardcover_book: "10", hardcover_edition: "500", isbn13: "9780441013593", isbn10: "0441013597" });
+    expect(e.work.parent).toMatchObject({ title: "Dune Chronicles", externalIds: { hardcover_series: "77" } });
+    expect(e.work.position).toEqual({ index: 1 });
+    const e2 = recs.find((r) => r.key === "ub:2");
+    if (e2?.kind !== "entry") throw new Error("no entry");
+    expect(e2.entry).toMatchObject({ status: "in_progress", rating: null, favorite: false });
+  });
+
+  test("re-reads yield two engagements with day precision", async () => {
+    const { ctx } = ctxFor(() => short);
+    const eng = (await collect(plugin.pull!(ctx))).filter((r) => r.kind === "engagement");
+    expect(eng.map((r) => r.key)).toEqual(["read:900", "read:901"]);
+    if (eng[0]?.kind !== "engagement") throw new Error();
+    expect(eng[0].engagement.startedAt).toEqual({ value: "2024-01-05", precision: "day" });
+    expect(eng[0].engagement.progress).toEqual({ pages: 412 });
+  });
+
+  test("merge yields synthetic record with mergedIntoKey", async () => {
+    const { ctx } = ctxFor(() => short);
+    const m = (await collect(plugin.pull!(ctx))).find((r) => r.key === "ub:2@book:20");
+    expect(m?.mergedIntoKey).toBe("ub:2");
+    if (m?.kind !== "entry") throw new Error();
+    expect(m.work.externalIds).toEqual({ hardcover_book: "20" });
+    expect((await collect(plugin.pull!(ctxFor(() => short).ctx))).some((r) => r.key === "ub:1@book:10")).toBe(false);
+  });
+
+  test("lists yield list records", async () => {
+    const { ctx } = ctxFor(() => short);
+    const l = (await collect(plugin.pull!(ctx))).find((r) => r.kind === "list");
+    expect(l?.key).toBe("list:5");
+    if (l?.kind !== "list") throw new Error();
+    expect(l.list.items[0]?.work.externalIds).toEqual({ hardcover_book: "10" });
+  });
+
+  test("sends bearer token", async () => {
+    let auth = "";
+    const f = (async (_i: unknown, init?: RequestInit) => {
+      auth = new Headers(init?.headers).get("authorization") ?? "";
+      return Response.json({ data: { me: [{ user_books: [], lists: [] }] } });
+    }) as typeof fetch;
+    await collect(plugin.pull!(createTestContext({ fetch: f, config: { token: "tok" } })));
+    expect(auth).toBe("Bearer tok");
+  });
+
+  test("GraphQL errors throw HttpError", async () => {
+    const { ctx } = ctxFor(() => errors);
+    await expect(collect(plugin.pull!(ctx))).rejects.toBeInstanceOf(HttpError);
+  });
+
+  test("offset paging continues on full page and stops on short page", async () => {
+    const row = short.data.me[0].user_books[0];
+    const full = { data: { me: [{ user_books: Array.from({ length: PAGE_SIZE }, (_, i) => ({ ...row, id: 1000 + i, user_book_reads: [] })) }] } };
+    const { ctx, calls } = ctxFor((b) => (b.variables.offset === 0 ? full : short));
+    await collect(plugin.pull!(ctx));
+    const ub = calls.filter((c) => c.query.includes("UserBooks"));
+    expect(ub.map((c) => c.variables.offset)).toEqual([0, 100]);
+  });
+});
+
+describe("hardcover pullChanges", () => {
+  test("filters by cursor and advances it", async () => {
+    const { ctx, calls } = ctxFor(() => short);
+    await ctx.cursor.set("2024-05-01T00:00:00+00:00");
+    const recs = await collect(plugin.pullChanges!(ctx));
+    expect(calls[0]?.variables.where).toEqual({ updated_at: { _gt: "2024-05-01T00:00:00+00:00" } });
+    expect(recs.some((r) => r.kind === "list")).toBe(false);
+    expect(ctx.saved.cursor.at(-1)).toBe("2024-06-01T10:00:00+00:00");
+  });
+});
+
+test("manifest", () => {
+  expect(plugin.manifest).toMatchObject({ id: "hardcover", capabilities: ["pull", "pullChanges", "lookup"], mediaTypes: ["book"], attribution: "Book data from Hardcover." });
+});
+
+describe("hardcover lookup", () => {
+  const search = (results: unknown) => {
+    const calls: unknown[] = [];
+    const f = (async (_i: unknown, init?: RequestInit) => {
+      calls.push(JSON.parse(String(init?.body)));
+      return Response.json({ data: { search: { results } } });
+    }) as typeof fetch;
+    return { ctx: createTestContext({ fetch: f, config: { token: "tok" } }), calls };
+  };
+
+  test("maps hits to WorkHints", async () => {
+    const { ctx, calls } = search({
+      hits: [
+        { document: { id: 10, title: "Dune", release_year: 1965, author_names: ["Frank Herbert"], image: { url: "https://img/dune.jpg" } } },
+        { document: { id: "11", title: "Bare" } },
+      ],
+    });
+    const out = await plugin.lookup!(ctx, { title: "dune" });
+    expect(out).toEqual([
+      { title: "Dune", mediaType: "book", year: 1965, creators: [{ name: "Frank Herbert" }], externalIds: { hardcover_book: "10" }, coverUrl: "https://img/dune.jpg" },
+      { title: "Bare", mediaType: "book", externalIds: { hardcover_book: "11" } },
+    ]);
+    expect((calls[0] as { variables: { q: string } }).variables.q).toBe("dune");
+  });
+
+  test("null results returns []", async () => {
+    expect(await plugin.lookup!(search(null).ctx, { title: "x" })).toEqual([]);
+  });
+
+  test("non-book mediaType returns [] without a request", async () => {
+    const { ctx, calls } = search({ hits: [] });
+    expect(await plugin.lookup!(ctx, { title: "x", mediaType: "movie" })).toEqual([]);
+    expect(calls).toHaveLength(0);
+  });
+});
+
+describe("status mapping", () => {
+  const cases: [number | null, string][] = [[1, "planned"], [2, "in_progress"], [3, "completed"], [4, "paused"], [5, "dropped"], [6, "none"], [null, "none"]];
+  for (const [id, want] of cases) {
+    test(`status_id ${id} -> ${want}`, async () => {
+      const row = { ...short.data.me[0].user_books[1], status_id: id, merged_at: null };
+      const ctx = createTestContext({
+        fetch: (async () => Response.json({ data: { me: [{ user_books: [row], lists: [] }] } })) as unknown as typeof fetch,
+      });
+      const e = (await collect(plugin.pull!(ctx))).find((r) => r.key === "ub:2");
+      if (e?.kind !== "entry") throw new Error();
+      expect(e.entry.status).toBe(want as never);
+    });
+  }
+});
diff --git a/plugins/hardcover/index.ts b/plugins/hardcover/index.ts
new file mode 100644
index 0000000..ed3272d
--- /dev/null
+++ b/plugins/hardcover/index.ts
@@ -0,0 +1,67 @@
+import { definePlugin } from "@sttracker/plugin-sdk/types";
+import type { MediaType, PluginContext, SourceRecord, WorkHint } from "@sttracker/plugin-sdk/types";
+import { gql, LISTS_QUERY, PAGE_SIZE, SEARCH_QUERY, USER_BOOKS_QUERY } from "./src/graphql.ts";
+import { mapList, mapUserBook } from "./src/map.ts";
+import type { HcList, HcUserBook } from "./src/map.ts";
+
+export { RATE_PER_MINUTE } from "./src/graphql.ts";
+
+async function* pageUserBooks(ctx: PluginContext, where: Record<string, unknown> | null): AsyncGenerator<HcUserBook> {
+  for (let offset = 0; ; offset += PAGE_SIZE) {
+    const d = await gql<{ me: { user_books: HcUserBook[] }[] }>(ctx, USER_BOOKS_QUERY, { limit: PAGE_SIZE, offset, where });
+    const rows = d.me[0]?.user_books ?? [];
+    yield* rows;
+    if (rows.length < PAGE_SIZE) return;
+  }
+}
+
+async function* pullChanges(ctx: PluginContext): AsyncGenerator<SourceRecord> {
+  const cursor = await ctx.cursor.get();
+  const where = cursor ? { updated_at: { _gt: cursor } } : null;
+  let max = cursor;
+  for await (const ub of pageUserBooks(ctx, where)) {
+    if (max === null || ub.updated_at > max) max = ub.updated_at;
+    yield* mapUserBook(ub);
+  }
+  if (max !== null && max !== cursor) await ctx.cursor.set(max);
+}
+
+async function* pull(ctx: PluginContext): AsyncGenerator<SourceRecord> {
+  let max: string | null = null;
+  for await (const ub of pageUserBooks(ctx, null)) {
+    if (max === null || ub.updated_at > max) max = ub.updated_at;
+    yield* mapUserBook(ub);
+  }
+  const d = await gql<{ me: { lists: HcList[] }[] }>(ctx, LISTS_QUERY, {});
+  for (const l of d.me[0]?.lists ?? []) yield mapList(l);
+  if (max !== null) await ctx.cursor.set(max);
+}
+
+interface SearchDoc { id: number | string; title: string; release_year?: number; author_names?: string[]; image?: { url?: string } }
+
+export default definePlugin({
+  manifest: {
+    id: "hardcover",
+    name: "Hardcover",
+    version: "0.1.0",
+    sdkVersion: 1,
+    mediaTypes: ["book"],
+    capabilities: ["pull", "pullChanges", "lookup"],
+    config: [{ key: "token", label: "Personal access token", type: "secret", required: true }],
+    attribution: "Book data from Hardcover.",
+  },
+  pull,
+  pullChanges,
+  async lookup(ctx, q: { title: string; mediaType?: MediaType; year?: number }): Promise<WorkHint[]> {
+    if (q.mediaType && q.mediaType !== "book") return [];
+    const d = await gql<{ search: { results: { hits?: { document: SearchDoc }[] } | null } }>(ctx, SEARCH_QUERY, { q: q.title });
+    return (d.search.results?.hits ?? []).map(({ document: x }) => ({
+      title: x.title,
+      mediaType: "book" as const,
+      externalIds: { hardcover_book: String(x.id) },
+      ...(x.release_year ? { year: x.release_year } : {}),
+      ...(x.author_names?.length ? { creators: x.author_names.map((name) => ({ name })) } : {}),
+      ...(x.image?.url ? { coverUrl: x.image.url } : {}),
+    }));
+  },
+});
diff --git a/plugins/hardcover/src/graphql.ts b/plugins/hardcover/src/graphql.ts
new file mode 100644
index 0000000..959e16b
--- /dev/null
+++ b/plugins/hardcover/src/graphql.ts
@@ -0,0 +1,36 @@
+import { HttpError } from "@sttracker/plugin-sdk/http";
+import type { PluginContext } from "@sttracker/plugin-sdk/types";
+
+export const ENDPOINT = "https://api.hardcover.app/v1/graphql";
+export const RATE_PER_MINUTE = 50;
+export const PAGE_SIZE = 100;
+
+const BOOK = `id title release_year contributions { author { name } }`;
+const BOOK_FULL = `id title release_year contributions { author { name } } book_series { position series { id name } }`;
+
+export const USER_BOOKS_QUERY = `query UserBooks($limit: Int!, $offset: Int!, $where: user_books_bool_exp) {
+  me { user_books(limit: $limit, offset: $offset, where: $where, order_by: {id: asc}) {
+    id status_id rating review_raw private_notes starred updated_at merged_at original_book_id
+    book { ${BOOK_FULL} }
+    edition { id isbn_13 isbn_10 asin }
+    user_book_reads { id started_at finished_at progress_pages }
+  } }
+}`;
+
+export const LISTS_QUERY = `query Lists { me { lists { id name description list_books { book { ${BOOK} } } } } }`;
+
+export const SEARCH_QUERY = `query Search($q: String!) { search(query: $q, query_type: "Book", per_page: 10) { results } }`;
+
+export async function gql<T>(ctx: PluginContext, query: string, variables: Record<string, unknown>): Promise<T> {
+  const creds = await ctx.credentials.get();
+  const token = creds?.token ?? (typeof ctx.config.token === "string" ? ctx.config.token : "");
+  const res = await ctx.http.json<{ data?: T; errors?: { message: string }[] }>(ENDPOINT, {
+    method: "POST",
+    headers: { "content-type": "application/json", authorization: `Bearer ${token}` },
+    body: JSON.stringify({ query, variables }),
+  });
+  if (res.errors?.length || res.data === undefined) {
+    throw new HttpError(200, JSON.stringify(res.errors ?? res), ENDPOINT);
+  }
+  return res.data;
+}
diff --git a/plugins/hardcover/src/map.ts b/plugins/hardcover/src/map.ts
new file mode 100644
index 0000000..25fc592
--- /dev/null
+++ b/plugins/hardcover/src/map.ts
@@ -0,0 +1,102 @@
+import { parsePartialDate } from "@sttracker/plugin-sdk/partial-date";
+import type { EntryFields, SourceRecord, Status, WorkHint } from "@sttracker/plugin-sdk/types";
+
+export interface HcBook {
+  id: number;
+  title: string;
+  release_year?: number | null;
+  contributions?: { author: { name: string } | null }[];
+  book_series?: { position: number | null; series: { id: number; name: string } }[];
+}
+export interface HcRead { id: number; started_at: string | null; finished_at: string | null; progress_pages: number | null }
+export interface HcUserBook {
+  id: number;
+  status_id: number | null;
+  rating: number | null;
+  review_raw: string | null;
+  private_notes: string | null;
+  starred: boolean | null;
+  updated_at: string;
+  merged_at: string | null;
+  original_book_id: number | null;
+  book: HcBook;
+  edition: { id: number; isbn_13: string | null; isbn_10: string | null; asin: string | null } | null;
+  user_book_reads: HcRead[];
+}
+export interface HcList { id: number; name: string; description: string | null; list_books: { book: HcBook }[] }
+
+export const STATUS: Record<number, Status> = { 1: "planned", 2: "in_progress", 3: "completed", 4: "paused", 5: "dropped", 6: "none" };
+
+export function bookHint(b: HcBook): WorkHint {
+  const creators = (b.contributions ?? []).flatMap((c) => (c.author ? [{ name: c.author.name }] : []));
+  const h: WorkHint = { title: b.title, mediaType: "book", externalIds: { hardcover_book: String(b.id) } };
+  if (b.release_year != null) h.year = b.release_year;
+  if (creators.length) h.creators = creators;
+  return h;
+}
+
+function workHint(ub: HcUserBook): WorkHint {
+  const h = bookHint(ub.book);
+  const e = ub.edition;
+  if (e) {
+    h.externalIds.hardcover_edition = String(e.id);
+    if (e.isbn_13) h.externalIds.isbn13 = e.isbn_13;
+    if (e.isbn_10) h.externalIds.isbn10 = e.isbn_10;
+    if (e.asin) h.externalIds.asin = e.asin;
+  }
+  const s = ub.book.book_series?.[0];
+  if (s) {
+    h.parent = { title: s.series.name, mediaType: "book", externalIds: { hardcover_series: String(s.series.id) } };
+    if (s.position != null) h.position = { index: s.position };
+  }
+  return h;
+}
+
+export function* mapUserBook(ub: HcUserBook): Generator<SourceRecord> {
+  const work = workHint(ub);
+  const entry: EntryFields = {
+    status: STATUS[ub.status_id ?? 6] ?? "none",
+    rating: ub.rating == null ? null : Math.round(ub.rating * 20),
+    review: ub.review_raw,
+    notes: ub.private_notes,
+    favorite: ub.starred === true,
+  };
+  const key = `ub:${ub.id}`;
+  yield { kind: "entry", key, raw: ub, work, entry };
+  for (const r of ub.user_book_reads) {
+    yield {
+      kind: "engagement",
+      key: `read:${r.id}`,
+      raw: r,
+      work,
+      engagement: {
+        startedAt: parsePartialDate(r.started_at),
+        finishedAt: parsePartialDate(r.finished_at),
+        ...(r.progress_pages != null ? { progress: { pages: r.progress_pages } } : {}),
+      },
+    };
+  }
+  if (ub.merged_at && ub.original_book_id != null && ub.original_book_id !== ub.book.id) {
+    yield {
+      kind: "entry",
+      key: `${key}@book:${ub.original_book_id}`,
+      raw: ub,
+      mergedIntoKey: key,
+      work: { title: ub.book.title, mediaType: "book", externalIds: { hardcover_book: String(ub.original_book_id) } },
+      entry,
+    };
+  }
+}
+
+export function mapList(l: HcList): SourceRecord {
+  return {
+    kind: "list",
+    key: `list:${l.id}`,
+    raw: l,
+    list: {
+      name: l.name,
+      ...(l.description ? { description: l.description } : {}),
+      items: l.list_books.map((lb) => ({ work: bookHint(lb.book) })),
+    },
+  };
+}
diff --git a/plugins/hardcover/test/fixtures/errors.json b/plugins/hardcover/test/fixtures/errors.json
new file mode 100644
index 0000000..70006b8
--- /dev/null
+++ b/plugins/hardcover/test/fixtures/errors.json
@@ -0,0 +1 @@
+{"errors":[{"message":"Invalid token"}]}
diff --git a/plugins/hardcover/test/fixtures/lists.json b/plugins/hardcover/test/fixtures/lists.json
new file mode 100644
index 0000000..6234d57
--- /dev/null
+++ b/plugins/hardcover/test/fixtures/lists.json
@@ -0,0 +1 @@
+{"data":{"me":[{"lists":[{"id":5,"name":"Favorites","description":"best","list_books":[{"book":{"id":10,"title":"Dune","release_year":1965,"contributions":[{"author":{"name":"Frank Herbert"}}]}}]}]}]}}
diff --git a/plugins/hardcover/test/fixtures/page-short.json b/plugins/hardcover/test/fixtures/page-short.json
new file mode 100644
index 0000000..3b016bc
--- /dev/null
+++ b/plugins/hardcover/test/fixtures/page-short.json
@@ -0,0 +1,9 @@
+{"data":{"me":[{"user_books":[
+{"id":1,"status_id":3,"rating":4.5,"review_raw":"Great","private_notes":"lent to Sam","starred":true,"updated_at":"2024-05-02T10:00:00+00:00","merged_at":null,"original_book_id":10,
+ "book":{"id":10,"title":"Dune","release_year":1965,"contributions":[{"author":{"name":"Frank Herbert"}}],"book_series":[{"position":1,"series":{"id":77,"name":"Dune Chronicles"}}]},
+ "edition":{"id":500,"isbn_13":"9780441013593","isbn_10":"0441013597","asin":null},
+ "user_book_reads":[{"id":900,"started_at":"2024-01-05","finished_at":"2024-01-20","progress_pages":412},{"id":901,"started_at":"2024-04-01","finished_at":"2024-04-15","progress_pages":null}]},
+{"id":2,"status_id":2,"rating":null,"review_raw":null,"private_notes":null,"starred":false,"updated_at":"2024-06-01T10:00:00+00:00","merged_at":"2024-05-30T00:00:00+00:00","original_book_id":20,
+ "book":{"id":21,"title":"Standalone","release_year":null,"contributions":[],"book_series":[]},
+ "edition":null,"user_book_reads":[]}
+]}]}}