diff --git a/packages/pds/package.json b/packages/pds/package.json
index 3487e5a..75f7bd1 100644
--- a/packages/pds/package.json
+++ b/packages/pds/package.json
@@ -64,7 +64,8 @@
 		"vite": "^6.4.1",
 		"vitest": "4.1.0-beta.1",
 		"wrangler": "^4.93.0",
-		"ws": "^8.18.3"
+		"ws": "^8.18.3",
+		"@getcirrus/space-conformance": "workspace:*"
 	},
 	"repository": {
 		"type": "git",
diff --git a/packages/pds/test/conformance.test.ts b/packages/pds/test/conformance.test.ts
new file mode 100644
index 0000000..efa0ed1
--- /dev/null
+++ b/packages/pds/test/conformance.test.ts
@@ -0,0 +1,79 @@
+/**
+ * The conformance suite run against the real, integrated PDS worker.
+ *
+ * This complements the in-process space-routes run in @getcirrus/spaces:
+ * here the target is the whole worker (discovery document, blob endpoints,
+ * space routes together), so the operator-tier checks — including blob
+ * isolation, which needs com.atproto.repo.uploadBlob and
+ * com.atproto.sync.getBlob — execute against production code paths.
+ *
+ * Foreign harness identities are not resolvable by the worker's real DID
+ * resolver, so the identity-requiring credential/delegation checks skip
+ * here; the space-routes run covers those with a wired resolver.
+ */
+
+import { describe, expect, it } from "vitest";
+import { filterCatalog, runChecks } from "@getcirrus/space-conformance";
+import { fullCatalog } from "@getcirrus/space-conformance/full";
+import { env, worker } from "./helpers";
+
+describe("conformance suite vs the integrated PDS", () => {
+	it("passes the operator-tier and discovery checks, blobs included", async () => {
+		const fetchAdapter: typeof fetch = (input, init) =>
+			worker.fetch(new Request(input as RequestInfo, init), env);
+
+		const catalog = filterCatalog(fullCatalog, {
+			// A full PDS: operator session, the public blob endpoints, and its
+			// own getDelegationToken — so the operator can mint a credential for
+			// its own space (the bulletin self-flow) without a foreign identity.
+			capabilities: ["operator", "pds-blobs", "pds-delegation"],
+			destructive: true,
+		});
+		const report = await runChecks({
+			catalog,
+			context: {
+				target: {
+					origin: `https://${env.PDS_HOSTNAME}`,
+					did: env.DID,
+					implementation: "cirrus-pds",
+				},
+				fetch: fetchAdapter,
+				operator: {
+					oauth: false,
+					async authorize(reqInit) {
+						reqInit.headers.set("Authorization", `Bearer ${env.AUTH_TOKEN}`);
+					},
+				},
+			},
+			suiteVersion: "in-process",
+			alphaBuild: "0.0.0-spaces-alpha-20260818163953",
+		});
+
+		const failures = report.results.filter(
+			(r) => r.status === "fail" || r.status === "error",
+		);
+		if (failures.length > 0) {
+			throw new Error(
+				`conformance failures:\n${failures
+					.map((f) => `  [${f.tier}] ${f.id}: ${f.status} — ${f.detail}`)
+					.join("\n")}`,
+			);
+		}
+
+		const byId = Object.fromEntries(
+			report.results.map((r) => [r.id, r.status]),
+		);
+		// Discovery and blob isolation ran against the real worker.
+		expect(byId["discovery.space-host-service"]).toBe("pass");
+		expect(byId["blobs.space-blob-not-public"]).toBe("pass");
+		expect(byId["writes.create-and-read"]).toBe("pass");
+		expect(byId["sync.getrepo-two-roots"]).toBe("pass");
+		// The self-flow credential round-trip runs end-to-end: the worker mints
+		// its own delegation token, exchanges it for a DPoP-bound credential,
+		// and serves the read. This is the interop-critical path the reference
+		// matrix also exercises.
+		expect(byId["credential.self-round-trip"]).toBe("pass");
+		// Identity-requiring checks skip here (no foreign resolution).
+		expect(byId["credential.round-trip"]).toBe("skipped");
+	});
+});
diff --git a/packages/spaces/package.json b/packages/spaces/package.json
index 92a62b5..cfcdbb7 100644
--- a/packages/spaces/package.json
+++ b/packages/spaces/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "@getcirrus/spaces",
 	"version": "0.1.0",
-	"description": "Atproto spaces engine (alpha) for Cloudflare Workers – permissioned repos, space hosting and credentials",
+	"description": "Atproto spaces engine (alpha) for Cloudflare Workers \u2013 permissioned repos, space hosting and credentials",
 	"type": "module",
 	"main": "dist/index.js",
 	"files": [
@@ -37,7 +37,8 @@
 		"tsdown": "^0.18.3",
 		"typescript": "^5.9.3",
 		"vitest": "4.1.0-beta.1",
-		"wrangler": "^4.93.0"
+		"wrangler": "^4.93.0",
+		"@getcirrus/space-conformance": "workspace:*"
 	},
 	"repository": {
 		"type": "git",
diff --git a/packages/spaces/test/conformance.test.ts b/packages/spaces/test/conformance.test.ts
new file mode 100644
index 0000000..48ffed4
--- /dev/null
+++ b/packages/spaces/test/conformance.test.ts
@@ -0,0 +1,134 @@
+/**
+ * The conformance suite, run in-process against Cirrus's own space routes.
+ *
+ * This is the runner that exercises the crypto-bound catalog end to end:
+ * harness reader identities (did:key) are resolved by this fixture's
+ * `getSigningKey`, so the full delegation → credential → read dance and the
+ * host-role checks actually execute against the real route handlers.
+ *
+ * Blob isolation needs PDS-level endpoints outside the space routes, so it
+ * declares the `pds-blobs` capability this fixture does not provide and is
+ * reported as skipped here; the PDS integration test covers it.
+ */
+
+import { env } from "cloudflare:test";
+import { describe, expect, it } from "vitest";
+import { Hono } from "hono";
+import type { Context } from "hono";
+import { Secp256k1Keypair } from "@atproto/crypto";
+import { filterCatalog, runChecks } from "@getcirrus/space-conformance";
+import {
+	KeypairIdentityProvider,
+	fullCatalog,
+} from "@getcirrus/space-conformance/full";
+import { createSpaceRoutes } from "../src/routes";
+import type { SpaceRoutesHost } from "../src/routes";
+import { TEST_OPERATOR_DID, TEST_SIGNING_KEY } from "./fixtures/spaces-worker/index";
+
+const OPERATOR = TEST_OPERATOR_DID;
+const ORIGIN = "https://pds.test";
+
+const operatorKeypair = await Secp256k1Keypair.import(TEST_SIGNING_KEY);
+
+function buildTarget() {
+	const host: SpaceRoutesHost = {
+		operatorDid: OPERATOR,
+		publicOrigin: ORIGIN,
+		// No blobs: the pds-blobs capability is not offered by this fixture.
+		getKeypair: async () => operatorKeypair,
+		getSigningKey: async (iss) => {
+			if (iss === OPERATOR) return operatorKeypair.did();
+			// Harness identities are did:key, which self-describe their key.
+			if (iss.startsWith("did:key:")) return iss;
+			throw new Error(`unknown issuer: ${iss}`);
+		},
+		resolveServiceEndpoint: async () => null,
+		resolveAuthorityEndpoint: async () => null,
+		verifyServiceJwt: async () => {
+			throw new Error("service auth not exercised by the conformance run");
+		},
+		authenticate: async (c: Context) => {
+			if (c.req.header("Authorization") === "Bearer operator-session") {
+				return { did: OPERATOR, fullTrust: true, allowsSpace: () => true };
+			}
+			return c.json({ error: "AuthMissing", message: "no session" }, 401);
+		},
+		validateRecord: ({ record }) => ({ record, status: "unknown" }),
+		getSpaceDO: (uri) => env.SPACES.get(env.SPACES.idFromName(uri)) as never,
+		getIndexDO: () =>
+			env.SPACES_INDEX.get(env.SPACES_INDEX.idFromName("spaces")) as never,
+	};
+
+	const spaceApp = createSpaceRoutes(host);
+	// Wrap the space routes with the discovery document the suite probes.
+	const app = new Hono();
+	app.get("/.well-known/did.json", (c) =>
+		c.json({
+			id: OPERATOR,
+			service: [
+				{
+					id: "#atproto_space_host",
+					type: "AtprotoSpaceHost",
+					serviceEndpoint: ORIGIN,
+				},
+			],
+			verificationMethod: [{ id: `${OPERATOR}#atproto` }],
+		}),
+	);
+	app.route("/", spaceApp);
+
+	const fetchAdapter: typeof fetch = (input, init) =>
+		app.fetch(new Request(input as RequestInfo, init));
+	return { fetchAdapter };
+}
+
+describe("conformance suite vs Cirrus space routes", () => {
+	it("passes every runnable must and should check", async () => {
+		const { fetchAdapter } = buildTarget();
+		const catalog = filterCatalog(fullCatalog, {
+			capabilities: ["operator", "identities"],
+			destructive: true,
+		});
+		const report = await runChecks({
+			catalog,
+			context: {
+				target: { origin: ORIGIN, did: OPERATOR, implementation: "cirrus" },
+				fetch: fetchAdapter,
+				operator: {
+					oauth: false,
+					async authorize(reqInit) {
+						reqInit.headers.set("Authorization", "Bearer operator-session");
+					},
+				},
+				identities: new KeypairIdentityProvider(),
+			},
+			suiteVersion: "in-process",
+			alphaBuild: "0.0.0-spaces-alpha-20260818163953",
+		});
+
+		const failures = report.results.filter(
+			(r) => r.status === "fail" || r.status === "error",
+		);
+		// Surface every failing check's detail so a regression is legible.
+		if (failures.length > 0) {
+			throw new Error(
+				`conformance failures:\n${failures
+					.map((f) => `  [${f.tier}] ${f.id}: ${f.status} — ${f.detail}`)
+					.join("\n")}`,
+			);
+		}
+
+		// A meaningful number of checks actually ran (not all skipped).
+		const ran = report.results.filter((r) => r.status === "pass");
+		expect(ran.length).toBeGreaterThanOrEqual(15);
+		// The credential dance, delegation refusals and host gating ran here.
+		const byId = Object.fromEntries(report.results.map((r) => [r.id, r.status]));
+		expect(byId["credential.round-trip"]).toBe("pass");
+		expect(byId["delegation.replay-refused"]).toBe("pass");
+		expect(byId["host.member-list-gates"]).toBe("pass");
+		expect(byId["sync.oplog-folds-to-commit"]).toBe("pass");
+		expect(byId["host.delete-space-tombstone"]).toBe("pass");
+		// Blob isolation needs a full PDS — skipped here, covered elsewhere.
+		expect(byId["blobs.space-blob-not-public"]).toBe("skipped");
+	});
+});
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 19f3d6e..f1c54e2 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -289,6 +289,9 @@ importers:
       '@cloudflare/workers-types':
         specifier: ^4.20260524.1
         version: 4.20260524.1
+      '@getcirrus/space-conformance':
+        specifier: workspace:*
+        version: link:../space-conformance
       '@ipld/car':
         specifier: ^5.4.2
         version: 5.4.2
@@ -402,6 +405,9 @@ importers:
       '@cloudflare/workers-types':
         specifier: ^4.20260524.1
         version: 4.20260524.1
+      '@getcirrus/space-conformance':
+        specifier: workspace:*
+        version: link:../space-conformance
       publint:
         specifier: ^0.3.16
         version: 0.3.17