diff --git a/src/api/routes.ts b/src/api/routes.ts
index 2d53bc620a..92aa9dfea3 100644
--- a/src/api/routes.ts
+++ b/src/api/routes.ts
@@ -155,6 +155,7 @@ import {
 } from "../services/mcp-compatibility";
 import { buildOperatorDashboardPayload } from "../services/operator-dashboard";
 import { buildSelfDogfoodRegistrationPack, resolveSelfDogfoodRepoFullName } from "../services/self-dogfood-registration-pack";
+import { buildSubnetInterfaceDescriptor } from "../services/subnet-interface";
 import {
   buildWeeklyValueReport,
   formatWeeklyValueReportMarkdown,
@@ -674,6 +675,14 @@ export function createApp() {
   app.get("/openapi.json", (c) => c.json(buildOpenApiSpec()));
   app.all("/mcp", handleMcpRequest);
 
+  // Public SN74 contribution-interface descriptor (#695): metagraphed (and any agent) fetches this to route
+  // gittensor discovery → Gittensory. Unauthenticated product metadata; excluded from requiresApiToken below.
+  app.get("/v1/public/subnet-interface", (c) => {
+    const origin = c.env.PUBLIC_API_ORIGIN ?? new URL(c.req.url).origin;
+    c.header("Cache-Control", "public, max-age=600, stale-while-revalidate=86400");
+    return c.json(buildSubnetInterfaceDescriptor({ origin, generatedAt: nowIso(), appSlug: c.env.GITHUB_APP_SLUG, upstreamRepo: c.env.GITTENSOR_UPSTREAM_REPO }));
+  });
+
   app.get("/v1/public/github/repos/:owner/:repo/stats", async (c) => {
     try {
       const stats = await fetchPublicRepoStats(c.env, c.req.param("owner"), c.req.param("repo"));
@@ -4144,6 +4153,7 @@ function requiresApiToken(path: string): boolean {
   if (path === "/health") return false;
   if (path === "/v1/mcp/compatibility") return false;
   if (/^\/v1\/public\/github\/repos\/[^/]+\/[^/]+\/stats$/.test(path)) return false;
+  if (path === "/v1/public/subnet-interface") return false;
   if (path === "/openapi.json") return false;
   if (path === "/mcp") return false;
   if (path.startsWith("/v1/auth/")) return false;
diff --git a/src/services/subnet-interface.ts b/src/services/subnet-interface.ts
new file mode 100644
index 0000000000..ae5c02238c
--- /dev/null
+++ b/src/services/subnet-interface.ts
@@ -0,0 +1,91 @@
+import { GITTENSOR_HOME_URL, GITTENSORY_SITE_URL } from "../github/footer";
+import { GITTENSORY_MCP_PACKAGE_NAME, LATEST_RECOMMENDED_MCP_VERSION, MINIMUM_SUPPORTED_MCP_VERSION } from "./mcp-compatibility";
+
+// Gittensor is Bittensor subnet 74 (the code subnet). Gittensory is its contribution interface.
+export const GITTENSOR_NETUID = 74;
+const DEFAULT_GITTENSOR_UPSTREAM_REPO = "entrius/gittensor";
+const SUBNET_INTERFACE_SCHEMA_VERSION = "1.0";
+
+// Curated, contribution-relevant MCP tools surfaced to agents/devs who discover gittensor via metagraphed.
+// Names mirror src/mcp/server.ts registrations; the list is intentionally a miner-facing subset (not all 33).
+const CONTRIBUTION_MCP_TOOLS: ReadonlyArray<{ name: string; summary: string }> = [
+  { name: "gittensory_get_decision_pack", summary: "Rank high-fit, low-duplicate issues to contribute to across registered repos." },
+  { name: "gittensory_check_before_start", summary: "Check whether an issue is already claimed or solved before writing code." },
+  { name: "gittensory_validate_linked_issue", summary: "Confirm that linking an issue will earn the linked-issue scoring multiplier." },
+  { name: "gittensory_preflight_pr", summary: "Preflight a planned PR for lane fit, duplicate risk, and review burden." },
+  { name: "gittensory_monitor_open_prs", summary: "Track your open PRs and what to clean up first." },
+  { name: "gittensory_list_notifications", summary: "See review feedback (e.g. changes requested) on your PRs." },
+  { name: "gittensory_agent_plan_next_work", summary: "Deterministically rank your next gittensor contribution actions." },
+];
+
+const ONBOARDING_STEPS: ReadonlyArray<string> = [
+  "Maintainers: install the Gittensory GitHub App on a gittensor-registered repository.",
+  "Contributors (miners): connect the Gittensory MCP endpoint in your agent harness (Claude Code, Cursor, etc.).",
+  "Use gittensory_get_decision_pack to find high-fit, low-duplicate issues, then gittensory_check_before_start before writing code.",
+  "Preflight with gittensory_preflight_pr and open a focused PR linked to its issue.",
+];
+
+export type SubnetInterfaceDescriptor = {
+  schemaVersion: string;
+  generatedAt: string;
+  subnet: { netuid: number; name: string; home: string; upstreamRepo: string };
+  provider: { name: string; role: "contribution_interface"; site: string; summary: string };
+  interfaces: {
+    mcp: {
+      kind: "mcp";
+      transport: "http";
+      endpoint: string;
+      package: string;
+      minimumVersion: string;
+      recommendedVersion: string;
+      tools: Array<{ name: string; summary: string }>;
+    };
+    githubApp: { kind: "github_app"; slug: string; installUrl: string };
+  };
+  onboarding: { docs: string; steps: string[] };
+};
+
+/**
+ * Machine-readable descriptor declaring Gittensory as gittensor (subnet 74)'s contribution interface, so
+ * metagraphed (and any agent) can route discovery → contribution (#695). Pure product metadata (URLs, tool
+ * names) — no private/reward/score wording, so it never needs sanitization. Public + unauthenticated.
+ */
+export function buildSubnetInterfaceDescriptor(args: { origin: string; generatedAt: string; appSlug: string; upstreamRepo?: string | undefined }): SubnetInterfaceDescriptor {
+  const origin = args.origin.replace(/\/+$/, "");
+  return {
+    schemaVersion: SUBNET_INTERFACE_SCHEMA_VERSION,
+    generatedAt: args.generatedAt,
+    subnet: {
+      netuid: GITTENSOR_NETUID,
+      name: "gittensor",
+      home: GITTENSOR_HOME_URL,
+      upstreamRepo: args.upstreamRepo ?? DEFAULT_GITTENSOR_UPSTREAM_REPO,
+    },
+    provider: {
+      name: "Gittensory",
+      role: "contribution_interface",
+      site: GITTENSORY_SITE_URL,
+      summary: "Gittensor-native contribution quality & planning layer: deterministic signals for miners and a free anti-slop + AI second-opinion gate for maintainers.",
+    },
+    interfaces: {
+      mcp: {
+        kind: "mcp",
+        transport: "http",
+        endpoint: `${origin}/mcp`,
+        package: GITTENSORY_MCP_PACKAGE_NAME,
+        minimumVersion: MINIMUM_SUPPORTED_MCP_VERSION,
+        recommendedVersion: LATEST_RECOMMENDED_MCP_VERSION,
+        tools: CONTRIBUTION_MCP_TOOLS.map((tool) => ({ ...tool })),
+      },
+      githubApp: {
+        kind: "github_app",
+        slug: args.appSlug,
+        installUrl: `https://github.com/apps/${args.appSlug}`,
+      },
+    },
+    onboarding: {
+      docs: GITTENSORY_SITE_URL,
+      steps: [...ONBOARDING_STEPS],
+    },
+  };
+}
diff --git a/test/integration/subnet-interface.test.ts b/test/integration/subnet-interface.test.ts
new file mode 100644
index 0000000000..c27bd86c50
--- /dev/null
+++ b/test/integration/subnet-interface.test.ts
@@ -0,0 +1,35 @@
+import { describe, expect, it } from "vitest";
+import { createApp } from "../../src/api/routes";
+import { createTestEnv } from "../helpers/d1";
+
+describe("public subnet-interface descriptor route", () => {
+  it("serves the SN74 contribution-interface descriptor without authentication", async () => {
+    const app = createApp();
+    const env = createTestEnv({ GITHUB_APP_SLUG: "gittensory", PUBLIC_API_ORIGIN: "https://gittensory-api.aethereal.dev" });
+
+    const response = await app.request("/v1/public/subnet-interface", {}, env);
+    expect(response.status).toBe(200);
+    expect(response.headers.get("cache-control")).toContain("max-age=600");
+    await expect(response.json()).resolves.toMatchObject({
+      schemaVersion: "1.0",
+      subnet: { netuid: 74, name: "gittensor" },
+      provider: { name: "Gittensory", role: "contribution_interface" },
+      interfaces: {
+        mcp: { endpoint: "https://gittensory-api.aethereal.dev/mcp", transport: "http" },
+        githubApp: { slug: "gittensory", installUrl: "https://github.com/apps/gittensory" },
+      },
+    });
+  });
+
+  it("falls back to the request origin when PUBLIC_API_ORIGIN is unset", async () => {
+    const app = createApp();
+    const env = createTestEnv({ GITHUB_APP_SLUG: "gittensory" });
+    delete (env as Partial<Env>).PUBLIC_API_ORIGIN;
+
+    const response = await app.request("https://fallback.example/v1/public/subnet-interface", {}, env);
+    expect(response.status).toBe(200);
+    await expect(response.json()).resolves.toMatchObject({
+      interfaces: { mcp: { endpoint: "https://fallback.example/mcp" } },
+    });
+  });
+});
diff --git a/test/unit/subnet-interface.test.ts b/test/unit/subnet-interface.test.ts
new file mode 100644
index 0000000000..9ac29bbae5
--- /dev/null
+++ b/test/unit/subnet-interface.test.ts
@@ -0,0 +1,33 @@
+import { describe, expect, it } from "vitest";
+import { buildSubnetInterfaceDescriptor, GITTENSOR_NETUID } from "../../src/services/subnet-interface";
+
+describe("buildSubnetInterfaceDescriptor", () => {
+  it("declares Gittensory as gittensor SN74's contribution interface", () => {
+    const descriptor = buildSubnetInterfaceDescriptor({
+      origin: "https://gittensory-api.aethereal.dev/",
+      generatedAt: "2026-06-14T00:00:00.000Z",
+      appSlug: "gittensory",
+      upstreamRepo: "entrius/gittensor",
+    });
+
+    expect(GITTENSOR_NETUID).toBe(74);
+    expect(descriptor.subnet).toMatchObject({ netuid: 74, name: "gittensor", upstreamRepo: "entrius/gittensor" });
+    expect(descriptor.provider).toMatchObject({ name: "Gittensory", role: "contribution_interface" });
+    // Trailing slash on origin is normalized before appending /mcp.
+    expect(descriptor.interfaces.mcp.endpoint).toBe("https://gittensory-api.aethereal.dev/mcp");
+    expect(descriptor.interfaces.mcp.transport).toBe("http");
+    expect(descriptor.interfaces.githubApp.installUrl).toBe("https://github.com/apps/gittensory");
+
+    const toolNames = descriptor.interfaces.mcp.tools.map((tool) => tool.name);
+    expect(toolNames).toContain("gittensory_get_decision_pack");
+    expect(toolNames).toContain("gittensory_list_notifications");
+    expect(descriptor.interfaces.mcp.tools.every((tool) => tool.summary.length > 0)).toBe(true);
+    expect(descriptor.onboarding.steps.length).toBeGreaterThan(0);
+  });
+
+  it("defaults the upstream repo when not provided and contains no private/reward wording", () => {
+    const descriptor = buildSubnetInterfaceDescriptor({ origin: "https://x.dev", generatedAt: "2026-06-14T00:00:00.000Z", appSlug: "gittensory" });
+    expect(descriptor.subnet.upstreamRepo).toBe("entrius/gittensor");
+    expect(JSON.stringify(descriptor)).not.toMatch(/wallet|hotkey|reward|payout|trust score|scoreability|ranking/i);
+  });
+});