book/01-first-module.md

@@ -135,7 +135,7 @@ whether it is a directory; a symlink answers no, and your module is skipped in
 complete silence. This is the single most common way a first install appears to do
 nothing at all.
 
-Two more things that look like your module failing and are not:
+Three more things that look like your module failing and are not:
 
 - If core is running in a container, your files have to be on the volume core sees
   — `MODULES_DIR` (`/app/modules` under the shipped Compose file), not the
@@ -143,6 +143,14 @@ Two more things that look like your module failing and are not:
 - A core with a fresh database boots in **maintenance mode**, and public module
   pages sit behind the same maintenance gate core's own do. Your page will look
   broken while the site is not live yet.
+- **A site runs one game module.** If the modules directory already holds one, an
+  Ultima Online or Rust site's for example, only the directory whose name sorts
+  first starts. Every other is refused before any of its code is read, and its
+  reason on Admin → Modules names both modules. `examplegame` sorts ahead of `rust`
+  and `uo`, so on such a core yours starts and the site's own module does not. Try
+  your module on a core of your own, with nothing else in its modules directory.
+  This is [`MODULE_SYSTEM.md` §2.5][system]; the installer refuses a second module
+  too, so the rule only surprises someone copying directories by hand.
 
 ## What you should see
 
@@ -270,6 +278,7 @@ what `ctx` hands you and why it is handed rather than imported, what each
 module must never do.
 
 [api]: https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/website/MODULE_API.md
+[system]: https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/website/MODULE_SYSTEM.md
 [issues]: https://gitea.whitlocktech.com/RunicGateway/Integration-kit/issues
 [renamecheck]: ../scripts/checkRenameSites.js
 [acceptance]: https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/modules/kit-acceptance.md

book/02-website-module.md

@@ -147,9 +147,10 @@ statement of your dependencies, and it makes a test double for it — see
 
 ## What you register
 
-Twelve calls — ten registrations and the two lifecycle hooks — all synchronous,
-all listed in [§2.4][api]. What is worth knowing is not their signatures but the
-model behind them.
+Nineteen calls, all synchronous and all listed in [§2.4][api]: fifteen
+registrations, the two lifecycle hooks, and the two identity-link hooks. Five of the
+registrations are the event system's, and [chapter 5](05-events.md) has those. What
+is worth knowing is not their signatures but the model behind them.
 
 **Every call stages; nothing is committed until your whole module is known good.**
 The shape of a claim is checked at the call, so a malformed one throws with your
@@ -505,6 +506,37 @@ warm-up it never finished, and handing it a half-built world to tear down is wor
 than not closing cleanly. A module with no hooks at all still reaches `started`:
 having nothing to warm up is not the same as never having started.
 
+### When a player links a sign-in identity
+
+If your game has its own idea of an account, a player's Steam id for instance, you
+may want to know when somebody links that identity to their site account
+(`MODULE_API_VERSION` 1.17.0). Linking stays core's. Core verifies the identity
+with its provider and writes the link; your module may read what core verified,
+refuse a link, and hear one, and nothing more.
+
+```js
+api.onIdentityLinking(async ({ userId, provider, subject }) => ({ ok: true }))
+api.onIdentityLinked(async ({ userId, provider, subject, displayName }) => {})
+// and, from anywhere: ctx.identities.list(userId, provider)
+```
+
+- **`onIdentityLinking` is asked before the link is written**, for every provider,
+  so filter on `provider` yourself. Answer `{ ok: false, reason: 'in_use' }` when
+  the identity already belongs to somebody else in your game; the person reads
+  core's own *"already linked to another user"*. **It fails closed**: a throw, or no
+  answer within 5 s, refuses the link. That is the right direction for a check whose
+  whole job is to stop one game account landing on two people.
+- **Your `message` is logged, never shown.** Module text on the page would let
+  anybody craft a link that prints a sentence of their choosing on the account
+  screen.
+- **`onIdentityLinked` is told after the row exists**, and is awaited for 5 s so
+  the page the person lands on already shows what you made of it. Its failure is
+  logged and the link stands, so write it to tolerate a race: your own record may be
+  taken between the check and this call, and "theirs stands" is the answer.
+- **There is no unlink hook.** Unlinking removes only the sign-in, and a record your
+  module made from it is yours to keep or remove.
+- Neither hook can mint a session or change who is signed in.
+
 ## The schema fragment
 
 `template/server/db/schema.sql` is your tables. It is replayed **in full, at every

book/05-events.md

@@ -89,6 +89,7 @@ api.registerEventLeases([{
   id: 'examplegame.rate.gather',
   label: 'Gather rate',
   type: 'float', min: 0.5, max: 5,
+  example: 2,                        // optional, 1.13.0: the value box's placeholder
   maxDurationMs: 48 * 60 * 60 * 1000,
 
   async read()                       { /* the live baseline */ },
@@ -167,6 +168,13 @@ second code path is a dry run of the second path. Validate everything you can
 reach without writing, then stop. Answering `{ ok: true }` unconditionally makes
 the dry run worthless in the one situation it exists for.
 
+**A dry run may also advise** (MODULE_API 1.16.0). `{ ok: true, detail: { warnings:
+["…"] } }` shows each line to the author as a warning on that step, and it never
+fails the dry run. Use it for what is true of the world now and may not be when the
+run starts: *"the spot is refused now: a player is within 50 m"*. Strings only, at
+most ten per step, each cut at 500 characters. What would make the step fail
+whenever it ran is not advice; answer that as a refusal.
+
 **`progress` is read by strangers, so it answers for one reader** (MODULE_API 1.12.0).
 While a run is live, core asks it how its step stands and puts the answer on the
 event's public page and in the app.
@@ -189,6 +197,48 @@ unreconstructable afterwards by anybody who did not write the action.
 another module) registered. A source that refuses degrades its field to free text
 with a warning and never blocks the form — so resolve from live data and return
 `[]` on failure, rather than defending with a hardcoded list that will be wrong.
+A row may carry a `note` (1.13.0), a sentence the editor shows under the field
+while that row is chosen. It is advice about the value; nothing on the save path
+reads it.
+
+Two more things a param can say, both for the editor's sake:
+
+- **`duration: 'minutes'`** (1.13.0), on an `int` or `float` that is a length of
+  time. The editor then knows the step holds something for that long, and sees to
+  it that the phase it sits in lasts at least as long. Declare it on every param
+  that is a duration; the editor has no other way to tell.
+- **`multiple: true`** (1.14.0), with an optional `max` (1 to 100, 20 by default),
+  on a `string` or `int`. The author picks several values, and `perform()` and
+  `cost()` receive an array. A bare value arrives as a list of one, so a spec
+  written by hand still works. Price the whole list in `cost()`: three kits given
+  are three gives.
+
+## Templates: a shortcut past the editor
+
+A fifth declaration, `api.registerEventTemplates` (MODULE_API 1.13.0), gives an
+author a named starting point for a new event: "A kit weekend", built from a kit
+and two dates.
+
+```js
+api.registerEventTemplates([{
+  id: 'examplegame.beacon-night',
+  label: 'Beacon night',
+  description: 'Light the beacons at dusk, put them out at dawn.',
+  inputs: [ /* params, as an action's are, at most 8 */ ],
+  async build({ inputs }) { return { title, summary, spec: { phases } } },
+}])
+```
+
+**A template is never a second way to make an event.** What `build()` returns is
+checked as a spec and opened as an ordinary unsaved draft, and the author saves it
+through the same route and the same checks as one they typed. So a template cannot
+make an event the save path would refuse, and nothing about it is stored: changing
+or removing one touches no event it ever made. When the inputs make no sense,
+answer `{ ok: false, error }` with a sentence for the author; anything you throw
+stays in the log.
+
+Build one last, once your actions and leases are right. It is a convenience over
+them, never a replacement for them.
 
 ---
 
@@ -233,6 +283,13 @@ silence and the operator sees `"<action id> refused"`. Writing this chapter's
 template is how that was found — its first draft used `detail`, and every refusal
 it produced was anonymous.
 
+**A retry may say when** (MODULE_API 1.15.0). Core retries a failed step after a
+flat minute. If your game knows better, as with a thing that is warming up for ten
+minutes, answer `{ ok: false, retry: true, retryAfterMs }`. Core clamps it to one
+to thirty minutes rather than refusing it, and it still counts as one attempt of
+the step's few: it changes *when*, never *how many*. So a hint is not a way to wait
+for something that may take an hour; refuse that, and say why in `error`.
+
 ## 2. Pass the idempotency key through, and put it on a command rather than a question
 
 Core hands `perform()` an `idempotencyKey` derived from the step's identity — never
@@ -315,6 +372,13 @@ time is up), call `ctx.events.expired({ kind, ref })` when it does. Core then ma
 row `expired`: finished as planned, never taken back at teardown. Left to `reconcile`,
 the same thing would turn up `orphaned` and read as something that went wrong.
 
+**And report its deadline when you make it.** A resource in `perform()`'s answer may
+carry `until`, the instant the game will end it by itself (an ISO string or epoch
+milliseconds). After an outage, core's reconcile can run before the game's own "it
+ended" has reached it. A resource gone past its `until` is then filed `expired`, as
+`ctx.events.expired()` would have filed it, instead of `orphaned`. Without `until`,
+the same outage turns every timed thing your event made into an operator's alarm.
+
 **You say WHEN to reconcile, because core cannot.** Core has no concept of the game
 being up — it sees `{ ok: false, retry: true }` and cannot tell a wedged sidecar
 from a game that rebooted and lost everything an event made. So it asks once, at
@@ -379,6 +443,8 @@ Four things a second module's author reaches for and should not.
    Its absence is merely a lower standard rather than a broken promise.
 7. **`progress`**, if a visitor would want to watch the step happen. It is the only
    one an outsider reads, so build it once the ledger it counts from is right.
+8. **A template**, if authors keep building the same event by hand. It saves them
+   typing and adds no power, so it comes last.
 
 Then read your own `revert` again, and ask what it answers when the game is down.
 

ci/core-ref.json

@@ -1,10 +1,29 @@
 {
   "repo": "https://gitea.whitlocktech.com/RunicGateway/website.git",
   "branch": "main",
-  "ref": "0a37a44164ab107584b918e656651452b50bd4f3",
+  "ref": "6890a74c7c4ad5690509e8c163e477d7f7b399e7",
   "why": [
     "The core this kit is written against, pinned to a commit rather than a branch.",
     "",
+    "2026-10-23: moved from 0a37a44 (1.12.0) to 6890a74 (1.17.0, website#220,",
+    "the cutover that brought Steam sign-in and the Rust last fixes to `main`),",
+    "past 1.13.0 to 1.16.0, which reached `main` together on 2026-10-22. The",
+    "chapters were read again for all five versions:",
+    "- 1.13.0: templates (chapter 5 gains a section), a param's duration, a",
+    "  lease's example, an option row's note;",
+    "- 1.14.0: a param's multiple and max;",
+    "- 1.15.0: a retry's retryAfterMs;",
+    "- 1.16.0: a dry run's detail.warnings;",
+    "- 1.17.0: onIdentityLinking / onIdentityLinked and ctx.identities.list",
+    "  (chapter 2 gains a section, and its call count is corrected to nineteen).",
+    "Two core changes in the same cutover carried no version bump, and both are",
+    "taught: a site runs ONE game module, which the loader now enforces at boot",
+    "(chapter 1, the reader most likely to be surprised by it), and a resource's",
+    "`until` is read at reconcile (chapter 5). The template declares none of the",
+    "new members, so nothing it does changed meaning; module.json's coreApi",
+    "becomes ^1.17.0 for the equality check. The real core run was repeated at",
+    "this ref, with the template as the only module in the directory.",
+    "",
     "2026-10-06: moved from 655fbf3f (1.10.0) to 0a37a44 (1.12.0, website#210),",
     "past 1.11.0 (website#209), which this pin had skipped. Chapter 5 was read again",
     "for both versions and gained two paragraphs:",

template/module.json

@@ -2,7 +2,7 @@
   "id": "examplegame",
   "name": "Example Game",
   "version": "0.1.0",
-  "coreApi": "^1.12.0",
+  "coreApi": "^1.17.0",
   "server": "server/index.js",
   "client": { "entry": "client/dist/entry.js" },
   "schema": "server/db/schema.sql",