diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4cd14c1..eecddc1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,16 @@
 # Changelog
 
-## Unreleased
-
+## 0.17.2 - 2026-10-08
+
+- The README names the agent guide at the start of Installation, and the agent
+  guide says that a reminder changes state only when it runs under
+  `solid_objects start`, so a query must not compute expiry from the clock.
+- `docs/agents.md` now tells agents to install the current release instead of
+  a remembered version, says that step 5 is required before the first call,
+  shows the two arguments of `reject`, and lists four API mistakes from
+  agent-written code with the correct form. The gem description now states
+  the Ruby 3.3 and Rails 7.1 requirement, because agents in the discovery
+  evaluation claimed Rails 8.0.
 - Claim the Context7 library: `context7.json` now carries the library `url` and
   the maintainer `public_key`.
 - Add the Context7 refresh workflow. A push to `main` that changes the README,
diff --git a/Gemfile.lock b/Gemfile.lock
index 29a71f2..76d0e8d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    solid_objects (0.17.1)
+    solid_objects (0.17.2)
       actioncable (>= 7.1)
       actionpack (>= 7.1)
       actionview (>= 7.1)
@@ -384,7 +384,7 @@ CHECKSUMS
   rubocop-rails-omakase (1.1.0) sha256=2af73ac8ee5852de2919abbd2618af9c15c19b512c4cfc1f9a5d3b6ef009109d
   ruby-progressbar (1.13.0) sha256=80fc9c47a9b640d6834e0dc7b3c94c9df37f08cb072b7761e4a71e22cff29b33
   securerandom (0.4.1) sha256=cc5193d414a4341b6e225f0cb4446aceca8e50d5e1888743fac16987638ea0b1
-  solid_objects (0.17.1)
+  solid_objects (0.17.2)
   sqlite3 (2.9.5-aarch64-linux-gnu) sha256=78075b6337d3d182c6d2b4691049ed45cd220826160c9ea18946bf6a1de200dc
   sqlite3 (2.9.5-aarch64-linux-musl) sha256=18c801185deb4adc01ddb281e8f672a39e3d1729979ca91e39439cd3eac0402d
   sqlite3 (2.9.5-arm-linux-gnu) sha256=1bdfca0c7d63998c60b0f4a8e3c8df2d33800ccc4abd2d612eddbbbc92a4c48b
diff --git a/README.md b/README.md
index d63e75a..234da25 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,8 @@ And so much more.
 
 ## Installation
 
-Solid Objects requires Ruby 3.3 or newer and Rails 7.1 or newer.
+Solid Objects requires Ruby 3.3 or newer and Rails 7.1 or newer. Coding agents
+should follow the [agent guide](docs/agents.md), which gives each step in order.
 
 ```bash
 bundle add solid_objects
diff --git a/docs/agents.md b/docs/agents.md
index 36bbda2..ac63991 100644
--- a/docs/agents.md
+++ b/docs/agents.md
@@ -64,6 +64,12 @@ bin/rails solid_objects:doctor
 The generator adds an initializer and copies migrations into the application.
 The doctor checks the configuration, the tables, and one real actor round trip.
 
+Install the current release. `bundle add solid_objects` selects it. Do not pin
+a version that you remember from earlier work; the API changed between
+releases. The current version is on <https://rubygems.org/gems/solid_objects>.
+
+The generated policies deny every call. Do step 5 before you call an actor.
+
 The `json` gem 3.x works only with Active Support 8.1.4 or newer. On Rails
 7.1, 7.2, 8.0, or 8.1 before 8.1.4, pin `gem "json", "~> 2"` in the
 `Gemfile`. Without the pin, Active Support raises an `ArgumentError`, such as
@@ -153,11 +159,25 @@ Obey these rules in actor code:
 - Use `schedule(at:, key:)` for delayed work. A reminder is one named alarm
   for each actor and key. A new `schedule` with the same key moves the alarm.
 - Use `reject(code, message)` for a business rule failure that must not retry.
+  It takes a code and a message, for example
+  `reject(:room_full, "The room is full")`.
 - Do not write Active Record models directly in a handler. The runtime raises
   `SolidObjects::ApplicationWriteForbidden`. Use `commit_action` for a short
   write in the same database.
 - Do not call an external API in a handler. Use `emit` and an effect handler.
 - Write each handler so that it can run again. Delivery is at least once.
+- A reminder changes state only when it runs, and it runs only while
+  `solid_objects start` runs. Do not compute expiry from the clock in a query;
+  read the state that the reminder committed.
+
+Avoid these mistakes:
+
+| Mistake | Correct form |
+| --- | --- |
+| `schedule(at: deadline)` with no operation after it | `schedule(at: deadline, key: buyer).expire(buyer:)`. `schedule` stages a reminder only when you call an operation on its result |
+| `reject "room full"` | `reject(:room_full, "The room is full")` |
+| `id` inside an actor | `actor_id`. An actor has no `id` method |
+| `register_effect(:name) { \|context, arguments\| ... }` | `register_effect(:name) { \|arguments, context\| ... }`. The arguments come first |
 
 [Reminders](reminders.md) and the [architecture guide](architecture.md) give
 the full actor API.
diff --git a/examples/quickstart/README.md b/examples/quickstart/README.md
index ecc3d82..a250f58 100644
--- a/examples/quickstart/README.md
+++ b/examples/quickstart/README.md
@@ -46,6 +46,9 @@ bin/rails db:migrate
 bin/rails solid_objects:doctor
 ```
 
+`bundle add solid_objects` installs the current release. Do not pin an older
+version from memory; the API changed between releases.
+
 The generator writes `config/initializers/solid_objects.rb` and copies the
 migrations. The migrations add the Solid Objects tables to the application's
 existing database.
diff --git a/lib/solid_objects/version.rb b/lib/solid_objects/version.rb
index fa193c1..ac83448 100644
--- a/lib/solid_objects/version.rb
+++ b/lib/solid_objects/version.rb
@@ -1,5 +1,5 @@
 # rbs_inline: enabled
 
 module SolidObjects
-  VERSION = "0.17.1"
+  VERSION = "0.17.2"
 end
diff --git a/solid_objects.gemspec b/solid_objects.gemspec
index 312054d..7693231 100644
--- a/solid_objects.gemspec
+++ b/solid_objects.gemspec
@@ -9,7 +9,7 @@ Gem::Specification.new do |spec|
   spec.version = SolidObjects::VERSION
   spec.authors = [ "Lucas Carlson" ]
   spec.summary = "SQL-backed virtual actors for Ruby on Rails"
-  spec.description = "Solid Objects is a SQL-backed virtual actor library for Ruby on Rails, with durable state, ordered operations, and automatic activation. It brings the Cloudflare Durable Objects programming model to Rails: addressable objects with ordered mailboxes, fenced activation, per-object reminders, transactional effects, and reactive ERB. It runs on MySQL, PostgreSQL, and SQLite without Redis."
+  spec.description = "Solid Objects is a SQL-backed virtual actor library for Ruby on Rails, with durable state, ordered operations, and automatic activation. It brings the Cloudflare Durable Objects programming model to Rails: addressable objects with ordered mailboxes, fenced activation, per-object reminders, transactional effects, and reactive ERB. It runs on MySQL, PostgreSQL, and SQLite without Redis, and requires Ruby 3.3 or newer and Rails 7.1 or newer."
   spec.homepage = "https://solidobjects.dev/ruby"
   spec.license = "MIT"
   spec.metadata = {
diff --git a/test/unit/gem_specification_test.rb b/test/unit/gem_specification_test.rb
index 3857238..db589f2 100644
--- a/test/unit/gem_specification_test.rb
+++ b/test/unit/gem_specification_test.rb
@@ -18,6 +18,7 @@ class GemSpecificationTest < ActiveSupport::TestCase
     assert_match(/virtual actors?/i, @specification.summary)
     assert_match(/Rails/, @specification.summary)
     assert_match(/SQL-backed virtual actor library for Ruby on Rails/, @specification.description)
+    assert_match(/requires Ruby 3\.3 or newer and Rails 7\.1 or newer/, @specification.description)
   end
 
   test "packages the agent and category guides" do