fix(mem0-plugin): accurate per-editor telemetry attribution + OpenCode telemetry (#5518)

integrations/mem0-plugin/.opencode-plugin/CHANGELOG.md

@@ -2,6 +2,12 @@
 
 All notable changes to the `@mem0/opencode-plugin` will be documented in this file.
 
+## 0.1.4 — Anonymous usage telemetry
+
+### Added
+
+- **PostHog telemetry (`telemetry.ts`):** Anonymous, fire-and-forget usage events. Opt out with `MEM0_TELEMETRY=false`. Only fires when an API key is present; never sends memory content, prompts, or the API key — only an anonymized `sha256(apiKey)[:32]` identity plus event type, platform, and plugin version. Emits the same schema as the Mem0 editor plugin (`plugin.*` events, `source: "plugin"`, `platform: "opencode"`) so OpenCode appears as a `platform` in the shared plugin dashboard. Events: `plugin.session_start` (with memory count) and `plugin.tool_use` (`add` / `search` / `update` / `delete`).
+
 ## 0.1.3 — File-context injection, session summaries & activity timeline
 
 ### Added

integrations/mem0-plugin/.opencode-plugin/opencode-mem0.ts

@@ -9,6 +9,7 @@ import { existsSync, readdirSync, cpSync, mkdirSync, readFileSync, writeFileSync
 import { homedir } from "os";
 import { join } from "path";
 import { createHash } from "crypto";
+import { captureEvent } from "./telemetry";
 
 async function getUserId(): Promise<string> {
   if (process.env.MEM0_USER_ID) return process.env.MEM0_USER_ID;
@@ -368,6 +369,8 @@ const Mem0Plugin: Plugin = async (ctx) => {
             });
           } catch {}
         }
+
+        captureEvent("session_start", { memory_count: memoryCount }, apiKey);
       }
 
       if (NUDGE_RE.test(safeText)) {
@@ -602,6 +605,17 @@ const Mem0Plugin: Plugin = async (ctx) => {
       if (MEM0_MCP_RE.test(toolName)) {
         if (toolName.includes("add_memory")) stats.adds++;
         if (toolName.includes("search")) stats.searches++;
+
+        const tool = toolName.includes("add_memory")
+          ? "add_memory"
+          : toolName.includes("search")
+            ? "search_memories"
+            : toolName.includes("delete")
+              ? "delete_memory"
+              : toolName.includes("update")
+                ? "update_memory"
+                : "other";
+        captureEvent("tool_use", { tool }, apiKey);
       }
 
       if (toolName === "bash" && toolOutput.length >= 50) {

integrations/mem0-plugin/.opencode-plugin/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@mem0/opencode-plugin",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "type": "module",
   "description": "Mem0 persistent memory plugin for OpenCode — add, search, and manage memories across sessions",
   "main": "dist/index.js",

integrations/mem0-plugin/.opencode-plugin/telemetry.test.ts

@@ -0,0 +1,51 @@
+import { afterEach, describe, expect, test } from "bun:test";
+import { buildEvent, captureEvent, isTelemetryEnabled } from "./telemetry";
+
+const KEY = "m0-testkey123";
+
+afterEach(() => {
+  delete process.env.MEM0_TELEMETRY;
+});
+
+describe("opencode telemetry", () => {
+  test("buildEvent uses the shared plugin.* schema with platform=opencode", () => {
+    const payload = buildEvent("session_start", { memory_count: 5 }, KEY);
+    expect(payload).not.toBeNull();
+    const props = payload!.properties as Record<string, unknown>;
+    expect(payload!.event).toBe("plugin.session_start");
+    expect(props.source).toBe("plugin");
+    expect(props.platform).toBe("opencode");
+    expect(props.memory_count).toBe(5);
+    expect(props.$process_person_profile).toBe(false);
+    expect(typeof props.plugin_version).toBe("string");
+  });
+
+  test("distinct_id is sha256(apiKey)[:32] — matches the editor plugin", async () => {
+    const { createHash } = await import("node:crypto");
+    const expected = createHash("sha256").update(KEY).digest("hex").slice(0, 32);
+    expect(buildEvent("session_start", {}, KEY)!.distinct_id).toBe(expected);
+  });
+
+  test("system properties win over caller-supplied ones", () => {
+    const props = buildEvent("x", { platform: "HACK", source: "HACK" }, KEY)!
+      .properties as Record<string, unknown>;
+    expect(props.platform).toBe("opencode");
+    expect(props.source).toBe("plugin");
+  });
+
+  test("returns null without an API key (no anonymous events)", () => {
+    expect(buildEvent("session_start", {}, undefined)).toBeNull();
+  });
+
+  test("opt-out via MEM0_TELEMETRY disables events", () => {
+    process.env.MEM0_TELEMETRY = "false";
+    expect(isTelemetryEnabled()).toBe(false);
+    expect(buildEvent("session_start", {}, KEY)).toBeNull();
+  });
+
+  test("captureEvent never throws (and sends nothing when opted out)", () => {
+    process.env.MEM0_TELEMETRY = "false";
+    expect(() => captureEvent("session_start", {}, KEY)).not.toThrow();
+    expect(() => captureEvent("session_start", {}, undefined)).not.toThrow();
+  });
+});

integrations/mem0-plugin/.opencode-plugin/telemetry.ts

@@ -0,0 +1,104 @@
+/**
+ * Plugin telemetry for the Mem0 OpenCode plugin — anonymous usage tracking
+ * via PostHog.
+ *
+ * Emits the SAME event schema as the Mem0 editor plugin's telemetry.py
+ * (event names prefixed `plugin.`, `source: "plugin"`, `platform: "opencode"`,
+ * `distinct_id = sha256(apiKey)[:32]`) so OpenCode shows up as just another
+ * `platform` value in the shared plugin dashboard instead of a separate
+ * event namespace.
+ *
+ * Fire-and-forget: never throws, never blocks, failures are swallowed. Only
+ * fires when an API key is present (same as the editor plugin — anonymous
+ * installs without a key emit nothing). Disable with MEM0_TELEMETRY=false.
+ *
+ * Never sends: memory content, API keys, raw user/project IDs. Only sends:
+ * event type, platform, plugin version, anonymized hash of the API key.
+ */
+
+import { createHash } from "node:crypto";
+import { readFileSync } from "node:fs";
+
+const POSTHOG_API_KEY = "phc_hgJkUVJFYtmaJqrvf6CYN67TIQ8yhXAkWzUn9AMU4yX";
+const POSTHOG_HOST = "https://us.i.posthog.com/i/v0/e/";
+const REQUEST_TIMEOUT_MS = 2_000;
+
+function _loadPluginVersion(): string {
+  // Source context: telemetry.ts sits next to package.json (./).
+  // Bundled context: dist/index.js sits one level below it (../).
+  for (const rel of ["./package.json", "../package.json"]) {
+    try {
+      const pkg = JSON.parse(readFileSync(new URL(rel, import.meta.url), "utf-8"));
+      if (pkg?.name === "@mem0/opencode-plugin" && pkg.version) return pkg.version;
+    } catch {
+      /* try next candidate */
+    }
+  }
+  return "unknown";
+}
+
+const PLUGIN_VERSION = _loadPluginVersion();
+
+export function isTelemetryEnabled(): boolean {
+  const val = process.env.MEM0_TELEMETRY;
+  if (val === undefined) return true;
+  const s = val.toLowerCase();
+  return s !== "false" && s !== "0" && s !== "no" && s !== "off";
+}
+
+function distinctId(apiKey: string): string {
+  // Matches telemetry.py `_distinct_id()` so the same user is one person in
+  // PostHog whether they use OpenCode or any other Mem0 editor plugin.
+  return createHash("sha256").update(apiKey).digest("hex").slice(0, 32);
+}
+
+/**
+ * Build the PostHog event payload, or null when telemetry is disabled or no
+ * API key is available. Pure (aside from env/version reads) and exported for
+ * testing. System-controlled properties are applied last so a caller cannot
+ * override `source`/`platform`/etc.
+ */
+export function buildEvent(
+  eventType: string,
+  properties: Record<string, unknown>,
+  apiKey: string | undefined,
+): Record<string, unknown> | null {
+  if (!isTelemetryEnabled() || !apiKey) return null;
+  return {
+    api_key: POSTHOG_API_KEY,
+    distinct_id: distinctId(apiKey),
+    event: `plugin.${eventType}`,
+    properties: {
+      ...properties,
+      source: "plugin",
+      platform: "opencode",
+      plugin_version: PLUGIN_VERSION,
+      os: process.platform,
+      sample_rate: 1.0,
+      $process_person_profile: false,
+      $lib: "posthog-node",
+    },
+  };
+}
+
+/** Send a usage event, fire-and-forget. Never throws, never blocks. */
+export function captureEvent(
+  eventType: string,
+  properties: Record<string, unknown>,
+  apiKey: string | undefined,
+): void {
+  const payload = buildEvent(eventType, properties, apiKey);
+  if (!payload) return;
+  try {
+    void fetch(POSTHOG_HOST, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify(payload),
+      signal: AbortSignal.timeout(REQUEST_TIMEOUT_MS),
+    }).catch(() => {
+      /* fire-and-forget */
+    });
+  } catch {
+    /* never throw */
+  }
+}

integrations/mem0-plugin/.opencode-plugin/tsconfig.json

@@ -16,5 +16,5 @@
     "emitDeclarationOnly": true
   },
   "include": ["**/*"],
-  "exclude": ["node_modules", "dist"]
+  "exclude": ["node_modules", "dist", "**/*.test.ts"]
 }