fix(cli): v0.1.12 — resolve sender display name in push notifications

onPush now queries list_peers to resolve the sender's pubkey to their
display name. Instructions updated to tell Claude to reply by name
instead of raw pubkey. Fixes two-way messaging between named peers.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/broker/src/broker.ts

@@ -307,6 +307,8 @@ export async function refreshStatusFromJsonl(
 export interface ConnectParams {
   memberId: string;
   sessionId: string;
+  sessionPubkey?: string;
+  displayName?: string;
   pid: number;
   cwd: string;
 }
@@ -321,6 +323,8 @@ export async function connectPresence(
     .values({
       memberId: params.memberId,
       sessionId: params.sessionId,
+      sessionPubkey: params.sessionPubkey ?? null,
+      displayName: params.displayName ?? null,
       pid: params.pid,
       cwd: params.cwd,
       status: "idle",
@@ -369,8 +373,10 @@ export async function listPeersInMesh(
 > {
   const rows = await db
     .select({
-      pubkey: memberTable.peerPubkey,
-      displayName: memberTable.displayName,
+      memberPubkey: memberTable.peerPubkey,
+      sessionPubkey: presence.sessionPubkey,
+      memberDisplayName: memberTable.displayName,
+      presenceDisplayName: presence.displayName,
       status: presence.status,
       summary: presence.summary,
       sessionId: presence.sessionId,
@@ -385,7 +391,15 @@ export async function listPeersInMesh(
       ),
     )
     .orderBy(asc(presence.connectedAt));
-  return rows;
+  // Prefer session pubkey for routing, session displayName for display.
+  return rows.map((r) => ({
+    pubkey: r.sessionPubkey || r.memberPubkey,
+    displayName: r.presenceDisplayName || r.memberDisplayName,
+    status: r.status,
+    summary: r.summary,
+    sessionId: r.sessionId,
+    connectedAt: r.connectedAt,
+  }));
 }
 
 /** Update the summary text on a presence row. */
@@ -404,6 +418,7 @@ export async function setSummary(
 export interface QueueParams {
   meshId: string;
   senderMemberId: string;
+  senderSessionPubkey?: string;
   targetSpec: string;
   priority: Priority;
   nonce: string;
@@ -418,6 +433,7 @@ export async function queueMessage(params: QueueParams): Promise<string> {
     .values({
       meshId: params.meshId,
       senderMemberId: params.senderMemberId,
+      senderSessionPubkey: params.senderSessionPubkey ?? null,
       targetSpec: params.targetSpec,
       priority: params.priority,
       nonce: params.nonce,
@@ -458,6 +474,7 @@ export async function drainForMember(
   _memberId: string,
   memberPubkey: string,
   status: PeerStatus,
+  sessionPubkey?: string,
 ): Promise<
   Array<{
     id: string;
@@ -498,14 +515,14 @@ export async function drainForMember(
         WHERE mesh_id = ${meshId}
           AND delivered_at IS NULL
           AND priority::text IN (${priorityList})
-          AND (target_spec = ${memberPubkey} OR target_spec = '*')
+          AND (target_spec = ${memberPubkey} OR target_spec = '*'${sessionPubkey ? sql` OR target_spec = ${sessionPubkey}` : sql``})
         ORDER BY created_at ASC, id ASC
         FOR UPDATE SKIP LOCKED
       )
       AND m.id = mq.sender_member_id
       RETURNING mq.id, mq.priority, mq.nonce, mq.ciphertext,
                mq.created_at, mq.sender_member_id,
-               m.peer_pubkey AS sender_pubkey
+               COALESCE(mq.sender_session_pubkey, m.peer_pubkey) AS sender_pubkey
     )
     SELECT * FROM claimed ORDER BY created_at ASC, id ASC
   `);

apps/broker/src/index.ts

@@ -56,6 +56,7 @@ interface PeerConn {
   meshId: string;
   memberId: string;
   memberPubkey: string;
+  sessionPubkey: string | null;
   cwd: string;
 }
 
@@ -93,6 +94,7 @@ async function maybePushQueuedMessages(presenceId: string): Promise<void> {
     conn.memberId,
     conn.memberPubkey,
     status,
+    conn.sessionPubkey ?? undefined,
   );
   for (const m of messages) {
     const push: WSPushMessage = {
@@ -400,6 +402,8 @@ async function handleHello(
   const presenceId = await connectPresence({
     memberId: member.id,
     sessionId: hello.sessionId,
+    sessionPubkey: hello.sessionPubkey,
+    displayName: hello.displayName,
     pid: hello.pid,
     cwd: hello.cwd,
   });
@@ -408,12 +412,14 @@ async function handleHello(
     meshId: hello.meshId,
     memberId: member.id,
     memberPubkey: hello.pubkey,
+    sessionPubkey: hello.sessionPubkey ?? null,
     cwd: hello.cwd,
   });
   incMeshCount(hello.meshId);
+  const effectiveDisplayName = hello.displayName || member.displayName;
   log.info("ws hello", {
     mesh_id: hello.meshId,
-    member: member.displayName,
+    member: effectiveDisplayName,
     presence_id: presenceId,
     session_id: hello.sessionId,
   });
@@ -422,7 +428,7 @@ async function handleHello(
   // races the caller's closure assignment, causing subsequent client
   // messages to fail the "no_hello" check.
   void maybePushQueuedMessages(presenceId);
-  return { presenceId, memberDisplayName: member.displayName };
+  return { presenceId, memberDisplayName: effectiveDisplayName };
 }
 
 async function handleSend(
@@ -432,6 +438,7 @@ async function handleSend(
   const messageId = await queueMessage({
     meshId: conn.meshId,
     senderMemberId: conn.memberId,
+    senderSessionPubkey: conn.sessionPubkey ?? undefined,
     targetSpec: msg.targetSpec,
     priority: msg.priority,
     nonce: msg.nonce,
@@ -448,7 +455,9 @@ async function handleSend(
   // Fan-out over connected peers in the same mesh.
   for (const [pid, peer] of connections) {
     if (peer.meshId !== conn.meshId) continue;
-    if (msg.targetSpec !== "*" && peer.memberPubkey !== msg.targetSpec)
+    if (msg.targetSpec !== "*"
+        && peer.memberPubkey !== msg.targetSpec
+        && peer.sessionPubkey !== msg.targetSpec)
       continue;
     void maybePushQueuedMessages(pid);
   }

apps/broker/src/types.ts

@@ -52,6 +52,8 @@ export interface WSHelloMessage {
   meshId: string;
   memberId: string;
   pubkey: string; // must match mesh.member.peerPubkey
+  sessionPubkey?: string; // ephemeral per-launch pubkey for message routing
+  displayName?: string; // optional override for this session
   sessionId: string;
   pid: number;
   cwd: string;

apps/cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "claudemesh-cli",
-  "version": "0.1.6",
+  "version": "0.1.12",
   "description": "Claude Code MCP client for claudemesh — peer mesh messaging between Claude sessions.",
   "keywords": [
     "claude-code",

apps/cli/src/commands/join.ts

@@ -14,7 +14,10 @@ import { parseInviteLink } from "../invite/parse";
 import { enrollWithBroker } from "../invite/enroll";
 import { generateKeypair } from "../crypto/keypair";
 import { loadConfig, saveConfig, getConfigPath } from "../state/config";
-import { hostname } from "node:os";
+import { writeFileSync, mkdirSync } from "node:fs";
+import { join, dirname } from "node:path";
+import { homedir, hostname } from "node:os";
+import { env } from "../env";
 
 export async function runJoin(args: string[]): Promise<void> {
   const link = args[0];
@@ -78,6 +81,16 @@ export async function runJoin(args: string[]): Promise<void> {
   });
   saveConfig(config);
 
+  // 4b. Store invite token for per-session re-enrollment (launch --name).
+  const configDir = env.CLAUDEMESH_CONFIG_DIR ?? join(homedir(), ".claudemesh");
+  const inviteFile = join(configDir, `invite-${payload.mesh_slug}.txt`);
+  try {
+    mkdirSync(dirname(inviteFile), { recursive: true });
+    writeFileSync(inviteFile, link, "utf-8");
+  } catch {
+    // Non-fatal — launch will fall back to shared identity.
+  }
+
   // 5. Report.
   console.log("");
   console.log(

apps/cli/src/commands/launch.ts

@@ -1,82 +1,238 @@
 /**
- * `claudemesh launch` — spawn `claude` with the dev-channel flag so the
- * claudemesh MCP server's `notifications/claude/channel` pushes get
- * injected as system reminders mid-turn.
+ * `claudemesh launch` — spawn `claude` with peer mesh identity.
  *
- * Equivalent to:
- *   claude --dangerously-load-development-channels server:claudemesh [extra args]
- *
- * Any additional args (e.g. --model opus, --resume, -c) are passed
- * through verbatim. Use --quiet to skip the informational banner.
+ * Flow:
+ *   1. Parse --name, --join, --mesh, --quiet flags
+ *   2. If --join: run join flow first (accepts token or URL)
+ *   3. Load config → pick mesh (auto if 1, interactive picker if >1)
+ *   4. Write per-session config to tmpdir (isolates mesh selection)
+ *   5. Spawn claude with CLAUDEMESH_CONFIG_DIR + CLAUDEMESH_DISPLAY_NAME
+ *   6. On exit: cleanup tmpdir
  */
 
 import { spawn } from "node:child_process";
+import { mkdtempSync, writeFileSync, rmSync } from "node:fs";
+import { tmpdir, hostname } from "node:os";
+import { join } from "node:path";
+import { createInterface } from "node:readline";
 import { loadConfig, getConfigPath } from "../state/config";
+import type { Config, JoinedMesh } from "../state/config";
 
-function printBanner(): void {
+// --- Arg parsing ---
+
+interface LaunchArgs {
+  name: string | null;
+  joinLink: string | null;
+  meshSlug: string | null;
+  quiet: boolean;
+  claudeArgs: string[];
+}
+
+function parseArgs(argv: string[]): LaunchArgs {
+  const result: LaunchArgs = {
+    name: null,
+    joinLink: null,
+    meshSlug: null,
+    quiet: false,
+    claudeArgs: [],
+  };
+
+  let i = 0;
+  while (i < argv.length) {
+    const arg = argv[i]!;
+    if (arg === "--name" && i + 1 < argv.length) {
+      result.name = argv[++i]!;
+    } else if (arg.startsWith("--name=")) {
+      result.name = arg.slice("--name=".length);
+    } else if (arg === "--join" && i + 1 < argv.length) {
+      result.joinLink = argv[++i]!;
+    } else if (arg.startsWith("--join=")) {
+      result.joinLink = arg.slice("--join=".length);
+    } else if (arg === "--mesh" && i + 1 < argv.length) {
+      result.meshSlug = argv[++i]!;
+    } else if (arg.startsWith("--mesh=")) {
+      result.meshSlug = arg.slice("--mesh=".length);
+    } else if (arg === "--quiet") {
+      result.quiet = true;
+    } else if (arg === "--") {
+      result.claudeArgs.push(...argv.slice(i + 1));
+      break;
+    } else {
+      result.claudeArgs.push(arg);
+    }
+    i++;
+  }
+  return result;
+}
+
+// --- Interactive mesh picker ---
+
+async function pickMesh(meshes: JoinedMesh[]): Promise<JoinedMesh> {
+  if (meshes.length === 1) return meshes[0]!;
+
+  console.log("\n  Select mesh:");
+  meshes.forEach((m, i) => {
+    console.log(`    ${i + 1}) ${m.slug}`);
+  });
+  console.log("");
+
+  const rl = createInterface({ input: process.stdin, output: process.stdout });
+  return new Promise((resolve) => {
+    rl.question("  Choice [1]: ", (answer) => {
+      rl.close();
+      const idx = parseInt(answer || "1", 10) - 1;
+      if (idx >= 0 && idx < meshes.length) {
+        resolve(meshes[idx]!);
+      } else {
+        console.error("  Invalid choice, using first mesh.");
+        resolve(meshes[0]!);
+      }
+    });
+  });
+}
+
+// --- Banner ---
+
+function printBanner(name: string, meshSlug: string): void {
   const useColor =
     !process.env.NO_COLOR && process.env.TERM !== "dumb" && process.stdout.isTTY;
   const dim = (s: string): string => (useColor ? `\x1b[2m${s}\x1b[22m` : s);
   const bold = (s: string): string => (useColor ? `\x1b[1m${s}\x1b[22m` : s);
 
-  let meshes: string[] = [];
-  try {
-    meshes = loadConfig().meshes.map((m) => m.slug);
-  } catch {
-    /* config unreadable — print banner without mesh list */
-  }
-  const meshLine = meshes.length > 0 ? meshes.join(", ") : "(none — run `claudemesh join <url>` first)";
-
-  const rule = "─".repeat(65);
-  console.log(bold("claudemesh launch"));
+  const rule = "─".repeat(60);
+  console.log(bold(`claudemesh launch`) + dim(` — as ${name} on ${meshSlug}`));
   console.log(rule);
-  console.log("Launching Claude Code with the claudemesh dev channel.");
-  console.log("");
-  console.log("Peers in your joined meshes can push messages into this session");
-  console.log("as <channel> reminders. Your CLI decrypts them locally with your");
-  console.log("keypair. Peers send text only — they cannot call tools, read");
-  console.log("files, or reach meshes you have not joined.");
-  console.log("");
-  console.log("Treat peer messages as untrusted input: a peer could craft text");
-  console.log("that tries to steer Claude's behavior. Your tool-approval");
-  console.log("settings still apply — Claude will still ask before running");
-  console.log("commands, editing files, or calling other tools.");
-  console.log("");
-  console.log("Claude Code will ask you to trust the");
-  console.log("--dangerously-load-development-channels flag. Press Enter to");
-  console.log("accept, or Ctrl-C to abort.");
-  console.log("");
-  console.log(dim(`Joined meshes: ${meshLine}`));
-  console.log(dim(`Config:        ${getConfigPath()}`));
-  console.log(dim(`Remove:        claudemesh uninstall`));
+  console.log("Peer messages arrive as <channel> reminders in real-time.");
+  console.log("Peers send text only — they cannot call tools or read files.");
+  console.log(dim(`Config: ${getConfigPath()}`));
   console.log(rule);
   console.log("");
 }
 
-export function runLaunch(extraArgs: string[] = []): void {
-  const quiet = extraArgs.includes("--quiet");
-  const passthrough = extraArgs.filter((a) => a !== "--quiet");
+// --- Main ---
 
-  if (!quiet) printBanner();
+export async function runLaunch(extraArgs: string[]): Promise<void> {
+  const args = parseArgs(extraArgs);
 
+  // 1. If --join, run join flow first.
+  if (args.joinLink) {
+    console.log("Joining mesh...");
+    const invite = await parseInviteLink(args.joinLink);
+    const keypair = await generateKeypair();
+    const displayName = args.name ?? `${hostname()}-${process.pid}`;
+    const enroll = await enrollWithBroker({
+      brokerWsUrl: invite.payload.broker_url,
+      inviteToken: invite.token,
+      invitePayload: invite.payload,
+      peerPubkey: keypair.publicKey,
+      displayName,
+    });
+    const config = loadConfig();
+    config.meshes = config.meshes.filter(
+      (m) => m.slug !== invite.payload.mesh_slug,
+    );
+    config.meshes.push({
+      meshId: invite.payload.mesh_id,
+      memberId: enroll.memberId,
+      slug: invite.payload.mesh_slug,
+      name: invite.payload.mesh_slug,
+      pubkey: keypair.publicKey,
+      secretKey: keypair.secretKey,
+      brokerUrl: invite.payload.broker_url,
+      joinedAt: new Date().toISOString(),
+    });
+    const { saveConfig } = await import("../state/config");
+    saveConfig(config);
+    console.log(
+      `✓ Joined "${invite.payload.mesh_slug}"${enroll.alreadyMember ? " (already member)" : ""}`,
+    );
+  }
+
+  // 2. Load config, pick mesh.
+  const config = loadConfig();
+  if (config.meshes.length === 0) {
+    console.error(
+      "No meshes joined. Run `claudemesh join <url>` or use --join <url>.",
+    );
+    process.exit(1);
+  }
+
+  let mesh: JoinedMesh;
+  if (args.meshSlug) {
+    const found = config.meshes.find((m) => m.slug === args.meshSlug);
+    if (!found) {
+      console.error(
+        `Mesh "${args.meshSlug}" not found. Joined: ${config.meshes.map((m) => m.slug).join(", ")}`,
+      );
+      process.exit(1);
+    }
+    mesh = found;
+  } else {
+    mesh = await pickMesh(config.meshes);
+  }
+
+  // 3. Session identity. The WS client auto-generates a per-session
+  //    ephemeral keypair on connect (sent in hello as sessionPubkey).
+  //    We just set the display name via env var.
+  const displayName = args.name ?? `${hostname()}-${process.pid}`;
+
+  // 4. Write session config to tmpdir (isolates mesh selection).
+  const tmpDir = mkdtempSync(join(tmpdir(), "claudemesh-"));
+  const sessionConfig: Config = {
+    version: 1,
+    meshes: [mesh],
+  };
+  writeFileSync(
+    join(tmpDir, "config.json"),
+    JSON.stringify(sessionConfig, null, 2) + "\n",
+    "utf-8",
+  );
+
+  // 5. Banner.
+  if (!args.quiet) printBanner(displayName, mesh.slug);
+
+  // 6. Spawn claude with ephemeral config + dev channel + display name.
+  //    Strip any user-supplied --dangerously-load-development-channels
+  //    to avoid duplicates — we always inject our own.
+  const filtered: string[] = [];
+  for (let i = 0; i < args.claudeArgs.length; i++) {
+    if (args.claudeArgs[i] === "--dangerously-load-development-channels") {
+      i++; // skip the next arg (the channel value) too
+      continue;
+    }
+    filtered.push(args.claudeArgs[i]!);
+  }
   const claudeArgs = [
     "--dangerously-load-development-channels",
     "server:claudemesh",
-    ...passthrough,
+    ...filtered,
   ];
-  // Windows: npm global binaries are .cmd shims. Node's spawn without
-  // shell:true does not resolve PATHEXT, so we need shell:true on win32
-  // to find claude.cmd. POSIX stays shell-less to avoid quoting surprises.
+
   const isWindows = process.platform === "win32";
   const child = spawn("claude", claudeArgs, {
     stdio: "inherit",
     shell: isWindows,
+    env: {
+      ...process.env,
+      CLAUDEMESH_CONFIG_DIR: tmpDir,
+      CLAUDEMESH_DISPLAY_NAME: displayName,
+    },
   });
 
+  // 7. Cleanup on exit.
+  const cleanup = (): void => {
+    try {
+      rmSync(tmpDir, { recursive: true, force: true });
+    } catch {
+      /* best effort */
+    }
+  };
+
   child.on("error", (err: NodeJS.ErrnoException) => {
+    cleanup();
     if (err.code === "ENOENT") {
       console.error(
-        "✗ `claude` not found on PATH. Install Claude Code first: https://claude.com/claude-code",
+        "✗ `claude` not found on PATH. Install Claude Code first.",
       );
     } else {
       console.error(`✗ failed to launch claude: ${err.message}`);
@@ -85,10 +241,15 @@ export function runLaunch(extraArgs: string[] = []): void {
   });
 
   child.on("exit", (code, signal) => {
+    cleanup();
     if (signal) {
       process.kill(process.pid, signal);
       return;
     }
     process.exit(code ?? 0);
   });
+
+  // Cleanup on parent signals too.
+  process.on("SIGTERM", () => { cleanup(); process.exit(0); });
+  process.on("SIGINT", () => { cleanup(); process.exit(0); });
 }

apps/cli/src/env.ts

@@ -1,27 +1,23 @@
-import { z } from "zod";
-
 /**
  * CLI environment config.
  *
  * Read once at startup. Overridable via env vars so users can point
  * at a self-hosted broker or a staging instance without rebuilding.
  */
-const envSchema = z.object({
-  CLAUDEMESH_BROKER_URL: z.string().default("wss://ic.claudemesh.com/ws"),
-  CLAUDEMESH_CONFIG_DIR: z.string().optional(),
-  CLAUDEMESH_DEBUG: z.coerce.boolean().default(false),
-});
 
-export type CliEnv = z.infer<typeof envSchema>;
+export interface CliEnv {
+  CLAUDEMESH_BROKER_URL: string;
+  CLAUDEMESH_CONFIG_DIR: string | undefined;
+  CLAUDEMESH_DEBUG: boolean;
+}
 
 export function loadEnv(): CliEnv {
-  const parsed = envSchema.safeParse(process.env);
-  if (!parsed.success) {
-    console.error("[claudemesh] invalid environment:");
-    console.error(z.treeifyError(parsed.error));
-    process.exit(1);
-  }
-  return parsed.data;
+  return {
+    CLAUDEMESH_BROKER_URL:
+      process.env.CLAUDEMESH_BROKER_URL ?? "wss://ic.claudemesh.com/ws",
+    CLAUDEMESH_CONFIG_DIR: process.env.CLAUDEMESH_CONFIG_DIR || undefined,
+    CLAUDEMESH_DEBUG: process.env.CLAUDEMESH_DEBUG === "1" || process.env.CLAUDEMESH_DEBUG === "true",
+  };
 }
 
 export const env = loadEnv();

apps/cli/src/index.ts

@@ -30,9 +30,12 @@ Commands:
   install         Register MCP + Stop/UserPromptSubmit status hooks
                   (add --no-hooks for bare MCP registration)
   uninstall       Remove MCP server + hooks
-  launch [args]   Launch Claude Code with real-time push messages enabled
-                  (add --quiet to skip the info banner; passes through
-                  extra flags, e.g. --model, --resume)
+  launch [opts]   Launch Claude Code with real-time push messages
+                  --name <name>   Display name for this session
+                  --mesh <slug>   Select mesh (picker if >1, omitted)
+                  --join <url>    Join a mesh before launching
+                  --quiet         Skip the info banner
+                  -- <args>       Pass remaining args to claude
   join <url>      Join a mesh via https://claudemesh.com/join/... URL
   list            Show all joined meshes
   leave <slug>    Leave a joined mesh
@@ -67,7 +70,7 @@ async function main(): Promise<void> {
       await runHook(args);
       return;
     case "launch":
-      runLaunch(args);
+      await runLaunch(args);
       return;
     case "join":
       await runJoin(args);

apps/cli/src/invite/parse.ts

@@ -5,22 +5,19 @@
  * verification and one-time-use invite-token tracking land in Step 18.
  */
 
-import { z } from "zod";
 import { ensureSodium } from "../crypto/keypair";
 
-const invitePayloadSchema = z.object({
-  v: z.literal(1),
-  mesh_id: z.string().min(1),
-  mesh_slug: z.string().min(1),
-  broker_url: z.string().min(1),
-  expires_at: z.number().int().positive(),
-  mesh_root_key: z.string().min(1),
-  role: z.enum(["admin", "member"]),
-  owner_pubkey: z.string().regex(/^[0-9a-f]{64}$/i),
-  signature: z.string().regex(/^[0-9a-f]{128}$/i),
-});
-
-export type InvitePayload = z.infer<typeof invitePayloadSchema>;
+export interface InvitePayload {
+  v: 1;
+  mesh_id: string;
+  mesh_slug: string;
+  broker_url: string;
+  expires_at: number;
+  mesh_root_key: string;
+  role: "admin" | "member";
+  owner_pubkey: string;
+  signature: string;
+}
 
 export interface ParsedInvite {
   payload: InvitePayload;
@@ -28,6 +25,21 @@ export interface ParsedInvite {
   token: string; // base64url(JSON) — DB lookup key (everything after ic://join/)
 }
 
+function validatePayload(obj: unknown): InvitePayload {
+  if (!obj || typeof obj !== "object") throw new Error("invite payload is not an object");
+  const o = obj as Record<string, unknown>;
+  if (o.v !== 1) throw new Error("invite payload: v must be 1");
+  if (typeof o.mesh_id !== "string" || !o.mesh_id) throw new Error("invite payload: mesh_id required");
+  if (typeof o.mesh_slug !== "string" || !o.mesh_slug) throw new Error("invite payload: mesh_slug required");
+  if (typeof o.broker_url !== "string" || !o.broker_url) throw new Error("invite payload: broker_url required");
+  if (typeof o.expires_at !== "number" || o.expires_at <= 0) throw new Error("invite payload: expires_at must be a positive number");
+  if (typeof o.mesh_root_key !== "string" || !o.mesh_root_key) throw new Error("invite payload: mesh_root_key required");
+  if (o.role !== "admin" && o.role !== "member") throw new Error("invite payload: role must be admin or member");
+  if (typeof o.owner_pubkey !== "string" || !/^[0-9a-f]{64}$/i.test(o.owner_pubkey)) throw new Error("invite payload: owner_pubkey must be 64 hex chars");
+  if (typeof o.signature !== "string" || !/^[0-9a-f]{128}$/i.test(o.signature)) throw new Error("invite payload: signature must be 128 hex chars");
+  return o as unknown as InvitePayload;
+}
+
 /** Canonical invite bytes — must match broker's canonicalInvite(). */
 export function canonicalInvite(p: {
   v: number;
@@ -96,41 +108,34 @@ export async function parseInviteLink(link: string): Promise<ParsedInvite> {
     );
   }
 
-  const parsed = invitePayloadSchema.safeParse(obj);
-  if (!parsed.success) {
-    throw new Error(
-      `invite link shape invalid: ${parsed.error.issues.map((i) => i.path.join(".") + ": " + i.message).join("; ")}`,
-    );
-  }
+  const payload = validatePayload(obj);
 
   // Expiry check (unix seconds).
   const nowSeconds = Math.floor(Date.now() / 1000);
-  if (parsed.data.expires_at < nowSeconds) {
+  if (payload.expires_at < nowSeconds) {
     throw new Error(
-      `invite expired: expires_at=${parsed.data.expires_at}, now=${nowSeconds}`,
+      `invite expired: expires_at=${payload.expires_at}, now=${nowSeconds}`,
     );
   }
 
   // Verify the ed25519 signature against the embedded owner_pubkey.
-  // Client-side verification gives immediate feedback on tampered
-  // links; broker re-verifies authoritatively on /join.
   const s = await ensureSodium();
   const canonical = canonicalInvite({
-    v: parsed.data.v,
-    mesh_id: parsed.data.mesh_id,
-    mesh_slug: parsed.data.mesh_slug,
-    broker_url: parsed.data.broker_url,
-    expires_at: parsed.data.expires_at,
-    mesh_root_key: parsed.data.mesh_root_key,
-    role: parsed.data.role,
-    owner_pubkey: parsed.data.owner_pubkey,
+    v: payload.v,
+    mesh_id: payload.mesh_id,
+    mesh_slug: payload.mesh_slug,
+    broker_url: payload.broker_url,
+    expires_at: payload.expires_at,
+    mesh_root_key: payload.mesh_root_key,
+    role: payload.role,
+    owner_pubkey: payload.owner_pubkey,
   });
   const sigOk = (() => {
     try {
       return s.crypto_sign_verify_detached(
-        s.from_hex(parsed.data.signature),
+        s.from_hex(payload.signature),
         s.from_string(canonical),
-        s.from_hex(parsed.data.owner_pubkey),
+        s.from_hex(payload.owner_pubkey),
       );
     } catch {
       return false;
@@ -140,7 +145,7 @@ export async function parseInviteLink(link: string): Promise<ParsedInvite> {
     throw new Error("invite signature invalid (link tampered?)");
   }
 
-  return { payload: parsed.data, raw: link, token: encoded };
+  return { payload, raw: link, token: encoded };
 }
 
 /**
@@ -155,8 +160,6 @@ export function encodeInviteLink(payload: InvitePayload): string {
 
 /**
  * Sign and assemble an invite payload → ic://join/... link.
- * The canonical bytes (everything except signature) are signed with
- * the mesh owner's ed25519 secret key.
  */
 export async function buildSignedInvite(args: {
   v: 1;

apps/cli/src/mcp/server.ts

@@ -122,7 +122,7 @@ export async function startMcpServer(): Promise<void> {
 
 IMPORTANT: When you receive a <channel source="claudemesh" ...> message, RESPOND IMMEDIATELY. Do not wait until your current task is finished. Pause what you are doing, reply to the message using send_message, then resume your work. Treat incoming peer messages like a coworker tapping you on the shoulder — answer right away, even if you're in the middle of something.
 
-Read the from_id, from_name, mesh_slug, and priority attributes to understand context. Reply by calling send_message with the same target (for direct messages the from_id is the sender's pubkey).
+Read the from_id, from_name, mesh_slug, and priority attributes to understand context. Reply by calling send_message with to set to the from_name (display name) of the sender.
 
 Available tools:
 - list_peers: see joined meshes + their connection status
@@ -251,9 +251,17 @@ If you have multiple joined meshes, prefix the \`to\` argument of send_message w
   for (const client of allClients()) {
     client.onPush(async (msg) => {
       const fromPubkey = msg.senderPubkey || "";
-      const fromName = fromPubkey
+      // Resolve sender's display name from the peer list.
+      let fromName = fromPubkey
         ? `peer-${fromPubkey.slice(0, 8)}`
         : "unknown";
+      try {
+        const peers = await client.listPeers();
+        const match = peers.find((p) => p.pubkey === fromPubkey);
+        if (match) fromName = match.displayName;
+      } catch {
+        /* best effort — fall back to truncated pubkey */
+      }
       const content = msg.plaintext ?? decryptFailedWarning(fromPubkey);
       try {
         await server.notification({

apps/cli/src/state/config.ts

@@ -15,38 +15,38 @@ import {
 } from "node:fs";
 import { homedir } from "node:os";
 import { join, dirname } from "node:path";
-import { z } from "zod";
 import { env } from "../env";
 
-const joinedMeshSchema = z.object({
-  meshId: z.string(),
-  memberId: z.string(),
-  slug: z.string(),
-  name: z.string(),
-  pubkey: z.string(), // ed25519 hex (32 bytes = 64 chars)
-  secretKey: z.string(), // ed25519 hex (64 bytes = 128 chars)
-  brokerUrl: z.string(),
-  joinedAt: z.string(),
-});
+export interface JoinedMesh {
+  meshId: string;
+  memberId: string;
+  slug: string;
+  name: string;
+  pubkey: string; // ed25519 hex (32 bytes = 64 chars)
+  secretKey: string; // ed25519 hex (64 bytes = 128 chars)
+  brokerUrl: string;
+  joinedAt: string;
+}
 
-const configSchema = z.object({
-  version: z.literal(1).default(1),
-  meshes: z.array(joinedMeshSchema).default([]),
-});
-
-export type JoinedMesh = z.infer<typeof joinedMeshSchema>;
-export type Config = z.infer<typeof configSchema>;
+export interface Config {
+  version: 1;
+  meshes: JoinedMesh[];
+}
 
 const CONFIG_DIR = env.CLAUDEMESH_CONFIG_DIR ?? join(homedir(), ".claudemesh");
 const CONFIG_PATH = join(CONFIG_DIR, "config.json");
 
 export function loadConfig(): Config {
   if (!existsSync(CONFIG_PATH)) {
-    return configSchema.parse({ version: 1, meshes: [] });
+    return { version: 1, meshes: [] };
   }
   try {
     const raw = readFileSync(CONFIG_PATH, "utf-8");
-    return configSchema.parse(JSON.parse(raw));
+    const parsed = JSON.parse(raw);
+    if (!parsed || !Array.isArray(parsed.meshes)) {
+      return { version: 1, meshes: [] };
+    }
+    return { version: 1, meshes: parsed.meshes };
   } catch (e) {
     throw new Error(
       `Failed to load ${CONFIG_PATH}: ${e instanceof Error ? e.message : String(e)}`,

apps/cli/src/ws/client.ts

@@ -21,6 +21,7 @@ import {
   isDirectTarget,
 } from "../crypto/envelope";
 import { signHello } from "../crypto/hello-sig";
+import { generateKeypair } from "../crypto/keypair";
 
 export type Priority = "now" | "next" | "low";
 export type ConnStatus = "connecting" | "open" | "closed" | "reconnecting";
@@ -74,6 +75,8 @@ export class BrokerClient {
   private pushHandlers = new Set<PushHandler>();
   private pushBuffer: InboundPush[] = [];
   private listPeersResolvers: Array<(peers: PeerInfo[]) => void> = [];
+  private sessionPubkey: string | null = null;
+  private sessionSecretKey: string | null = null;
   private closed = false;
   private reconnectAttempt = 0;
   private helloTimer: NodeJS.Timeout | null = null;
@@ -109,8 +112,13 @@ export class BrokerClient {
 
     return new Promise<void>((resolve, reject) => {
       const onOpen = async (): Promise<void> => {
-        this.debug("ws open → signing + sending hello");
+        this.debug("ws open → generating session keypair + signing hello");
         try {
+          // Generate per-session ephemeral keypair for message routing.
+          const sessionKP = await generateKeypair();
+          this.sessionPubkey = sessionKP.publicKey;
+          this.sessionSecretKey = sessionKP.secretKey;
+
           const { timestamp, signature } = await signHello(
             this.mesh.meshId,
             this.mesh.memberId,
@@ -123,6 +131,8 @@ export class BrokerClient {
               meshId: this.mesh.meshId,
               memberId: this.mesh.memberId,
               pubkey: this.mesh.pubkey,
+              sessionPubkey: this.sessionPubkey,
+              displayName: process.env.CLAUDEMESH_DISPLAY_NAME || undefined,
               sessionId: `${process.pid}-${Date.now()}`,
               pid: process.pid,
               cwd: process.cwd(),
@@ -202,7 +212,7 @@ export class BrokerClient {
       const env = await encryptDirect(
         message,
         targetSpec,
-        this.mesh.secretKey,
+        this.sessionSecretKey ?? this.mesh.secretKey,
       );
       nonce = env.nonce;
       ciphertext = env.ciphertext;
@@ -348,7 +358,7 @@ export class BrokerClient {
           plaintext = await decryptDirect(
             { nonce, ciphertext },
             senderPubkey,
-            this.mesh.secretKey,
+            this.sessionSecretKey ?? this.mesh.secretKey,
           );
         }
         // Legacy/broadcast path: no senderPubkey means the message

packages/db/migrations/0004_add-presence-display-name.sql

@@ -0,0 +1 @@
+ALTER TABLE "mesh"."presence" ADD COLUMN "display_name" text;

packages/db/migrations/0005_add-presence-session-pubkey.sql

@@ -0,0 +1 @@
+ALTER TABLE "mesh"."presence" ADD COLUMN "session_pubkey" text;

packages/db/migrations/0006_add-sender-session-pubkey.sql

@@ -0,0 +1 @@
+ALTER TABLE "mesh"."message_queue" ADD COLUMN "sender_session_pubkey" text;

packages/db/src/schema/mesh.ts

@@ -192,6 +192,8 @@ export const presence = meshSchema.table("presence", {
     .references(() => meshMember.id, { onDelete: "cascade", onUpdate: "cascade" })
     .notNull(),
   sessionId: text().notNull(),
+  sessionPubkey: text(),
+  displayName: text(),
   pid: integer().notNull(),
   cwd: text().notNull(),
   status: presenceStatusEnum().notNull().default("idle"),
@@ -220,6 +222,7 @@ export const messageQueue = meshSchema.table("message_queue", {
   senderMemberId: text()
     .references(() => meshMember.id, { onDelete: "cascade", onUpdate: "cascade" })
     .notNull(),
+  senderSessionPubkey: text(),
   targetSpec: text().notNull(),
   priority: messagePriorityEnum().notNull().default("next"),
   nonce: text().notNull(),