feat(plugin): SessionStart hook discovers and announces active peers

session-announce now calls /v1/list with the session's X-Mailbox header,
which both registers the session with the daemon and returns all known
mailboxes in one round-trip. The output appends an "Active peers" block
listing mailboxes seen within the last hour (configurable via
--peer-window-minutes), capped at 10 entries by default. Self is
filtered out; the list is sorted most-recent-first.

So when the user says "I started a second session, coordinate with it",
Claude already has the peer's mailbox name in context — no manual
list_mailboxes call needed.

The peer-formatting logic is extracted into formatActivePeerList for
unit testing; CLI tests now pin --url to an unreachable port to keep
assertions stable on machines that have a real daemon running.
This commit is contained in:
Mika Kuns
2026-05-19 11:59:31 +02:00
parent 9fd321043f
commit 48b6ba6452
5 changed files with 166 additions and 10 deletions

View File

@@ -79,6 +79,8 @@ describe("`check --hook` CLI behavior", () => {
});
describe("`session-announce` CLI behavior", () => {
const UNREACHABLE = "http://127.0.0.1:1";
beforeAll(() => {
if (!existsSync(cliPath)) {
throw new Error(`CLI not built. Run \`npm run build\` first. Missing: ${cliPath}`);
@@ -86,7 +88,7 @@ describe("`session-announce` CLI behavior", () => {
});
it("prints the derived mailbox name from a SessionStart payload", () => {
const r = runCli(["session-announce"], {
const r = runCli(["session-announce", "--url", UNREACHABLE], {
env: { CLAUDE_MAILBOX_NAME: undefined },
stdin: HOOK_STDIN,
});
@@ -97,7 +99,7 @@ describe("`session-announce` CLI behavior", () => {
});
it("uses base prefix when set", () => {
const r = runCli(["session-announce"], {
const r = runCli(["session-announce", "--url", UNREACHABLE], {
env: { CLAUDE_MAILBOX_NAME: "backend" },
stdin: HOOK_STDIN,
});
@@ -105,8 +107,17 @@ describe("`session-announce` CLI behavior", () => {
expect(r.stdout).toContain("`backend-abc12345`");
});
it("emits daemon-not-reachable hint when daemon is down", () => {
const r = runCli(["session-announce", "--url", UNREACHABLE], {
env: { CLAUDE_MAILBOX_NAME: undefined },
stdin: HOOK_STDIN,
});
expect(r.status).toBe(0);
expect(r.stdout).toContain("[Claude-Mailbox] Daemon not reachable");
});
it("stays silent when no session_id in stdin", () => {
const r = runCli(["session-announce"], {
const r = runCli(["session-announce", "--url", UNREACHABLE], {
env: { CLAUDE_MAILBOX_NAME: undefined },
stdin: JSON.stringify({ hook_event_name: "SessionStart" }),
});
@@ -115,7 +126,9 @@ describe("`session-announce` CLI behavior", () => {
});
it("stays silent when no stdin at all", () => {
const r = runCli(["session-announce"], { env: { CLAUDE_MAILBOX_NAME: undefined } });
const r = runCli(["session-announce", "--url", UNREACHABLE], {
env: { CLAUDE_MAILBOX_NAME: undefined },
});
expect(r.status).toBe(0);
expect(r.stdout).toBe("");
});