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@@ -0,0 +1,64 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## What this is
+
+`env` is a Kotlin/Java library for emulating a microservice's external environment in tests (DBs, message queues, mocks, etc.). Published to Maven Central under `io.github.adven27`. The core abstraction is deliberately agnostic to *how* a system is emulated — Testcontainers/Docker, an embedded process, or a remote server — so a single `Environment` can mix them.
+
+## Build & test
+
+Gradle multi-module build. Use the wrapper.
+
+```bash
+./gradlew build                         # compile + test + lint (detekt + ktlint) all modules
+./gradlew build --parallel              # what CI runs
+./gradlew :env-db-postgresql:test       # test one module
+./gradlew :example:test --tests "EnvTest.fixedEnvironment"   # single test
+./gradlew ktlintFormat                  # auto-fix Kotlin style across a module's src
+./gradlew detekt                        # static analysis only
+```
+
+Most modules' tests start real Docker containers via Testcontainers, so **a running Docker daemon is required** to run them. JDK 21 toolchain.
+
+## Architecture
+
+Everything hangs off two interfaces in `env-core` (`io.github.adven27.env.core`):
+
+- **`ExternalSystem`** — one emulated system. Lifecycle: `start(fixedEnv)` / `stop()` / `running()`, plus a `config: ExternalSystemConfig`. Constructing an `ExternalSystemConfig` **propagates its properties to JVM system properties** as a side effect (see `ExternalSystemConfig.init`) — that's how the system under test discovers connection details (e.g. `env.db.postgresql.url`).
+- **`Environment`** — an ordered map of `name -> ExternalSystem`. `up()` starts all systems concurrently (cached thread pool, one thread per system) with a timeout, rolling back via `down()` on any failure. Look up a started system with `env<RabbitContainerSystem>()` (by type) or `env<T>("NAME")` (by key).
+
+Two implementation strategies for `ExternalSystem`, both in their own modules:
+- **`GenericExternalSystem<T, C>`** (`env-core`) — wraps any object with `start`/`stop`/`running`/`afterStart` lambdas. Base for non-container systems.
+- **`ContainerExternalSystem`** (`env-container`) — wraps a Testcontainers `GenericContainer`. Most `env-db-*` / `env-mq-*` modules build on this. Note: some systems (e.g. `PostgreSqlContainerSystem`) instead *extend* the Testcontainers class directly and implement `ExternalSystem`.
+
+### The `fixedEnv` flag (important)
+
+`start(fixedEnv: Boolean)` is the central concept for **fixed vs. dynamic** ports:
+- `fixedEnv = true` → bind well-known fixed ports (e.g. Postgres on 5432). Used for stable local dev where the SUT has hardcoded connection config.
+- `fixedEnv = false` → let the system pick random free ports. Used in CI / parallel test runs to avoid collisions.
+
+The value comes from `Environment.Config.envStrategy` — default `SystemPropertyToggle` reads the `ENV_FIXED` system property (default `false`). See `env/example/.../EnvTest.kt` for both modes asserted.
+
+### Config via system properties
+
+`Environment.Config` is resolved from system properties by default (`ConfigResolver.FromSystemProperty`): `ENV_FIXED`, `ENV_DRY_RUN`, `ENV_UP_TIMEOUT_SEC` (300), `ENV_DOWN_TIMEOUT_SEC` (10).
+
+### Standalone runner
+
+`EnvStarter` (`env-core`) runs any `Environment` subclass as a standalone process (interactive REPL: `s`tatus / `u`p / `d`own / `e`xit), for local dev outside a test run. Invoked via `JavaExec` with the env class name as arg (see README).
+
+## Module layout
+
+- `env-core` — interfaces, `Environment`, `EnvStarter`, port utils. No Testcontainers dependency.
+- `env-container` — Testcontainers base (`ContainerExternalSystem`, `String.parseImage()` helpers).
+- `env-db-*`, `env-mq-*`, `env-redis`, `env-wiremock`, `env-grpc-mock`, `env-selenium`, `env-localstack`, `env-samba`, `env-jar-application` — one system implementation each. Add a new system by creating a `env-<kind>` module (register it in `settings.gradle`) and depending on `env-container` or `env-core`.
+- `example` — runnable usage reference (`EnvTest.kt`); not published.
+
+## Conventions
+
+- **Adding a system**: also add it to `build.gradle`'s `publishMaven` task (the `dependsOn` list) and to `settings.gradle`.
+- Config property keys are namespaced `env.<kind>.<system>.<field>` (e.g. `env.mq.rabbit.port`). Define them as constants on the `Config` companion.
+- Public API targets Java interop (`@JvmOverloads`, `@JvmStatic`, `@JvmField`); keep that when touching constructors/companions.
+- Version lives in one place: `ext.libVersion` in root `build.gradle`. Release commits are just the bumped version number (see git log); publishing is automated on GitHub Release via the `gradle-publish.yml` workflow.
+- Style: ktlint + detekt (config in `config/detekt/detekt.yml`), 4-space indent, no trailing commas (`.editorconfig`).
diff --git a/env-mq-kafka-embedded/src/main/java/io/github/adven27/env/mq/kafka/embedded/EmbeddedKafkaSystem.kt b/env-mq-kafka-embedded/src/main/java/io/github/adven27/env/mq/kafka/embedded/EmbeddedKafkaSystem.kt
index 0d3f54e..9c959cc 100644
--- a/env-mq-kafka-embedded/src/main/java/io/github/adven27/env/mq/kafka/embedded/EmbeddedKafkaSystem.kt
+++ b/env-mq-kafka-embedded/src/main/java/io/github/adven27/env/mq/kafka/embedded/EmbeddedKafkaSystem.kt
@@ -61,6 +61,18 @@ open class EmbeddedKafkaSystem @JvmOverloads constructor(
     @Suppress("SpreadOperator")
     constructor(vararg topics: String) : this(topics = arrayOf(*topics))
 
+    fun addTopics(vararg topics: String) {
+        embeddedKafka.addTopicsWithResults(*topics)
+            .filterValues { it != null }
+            .let { failures ->
+                require(failures.isEmpty()) {
+                    "Не удалось создать топики: " + failures.entries.joinToString { "${it.key}: ${it.value.message}" }
+                }
+            }
+    }
+
+    fun topics(): Set<String> = embeddedKafka.topics
+
     override fun toString() = "Embedded Kafka Broker"
 
     open class Config(val bootstrapServers: String = "PLAINTEXT://localhost:$DEFAULT_KAFKA_PORT") :
diff --git a/env-mq-kafka-embedded/src/test/kotlin/io/github/adven27/env/mq/kafka/embedded/EmbeddedKafkaSystemTest.kt b/env-mq-kafka-embedded/src/test/kotlin/io/github/adven27/env/mq/kafka/embedded/EmbeddedKafkaSystemTest.kt
index 99b2941..ae3b68b 100644
--- a/env-mq-kafka-embedded/src/test/kotlin/io/github/adven27/env/mq/kafka/embedded/EmbeddedKafkaSystemTest.kt
+++ b/env-mq-kafka-embedded/src/test/kotlin/io/github/adven27/env/mq/kafka/embedded/EmbeddedKafkaSystemTest.kt
@@ -40,6 +40,23 @@ class EmbeddedKafkaSystemTest {
         ).use { assertTrue(it.listTopics().names().get().contains("some-topic")) }
     }
 
+    @Test
+    fun topicsCanBeAddedToARunningEnvironment() {
+        val env = SomeEnvironment().apply { up() }
+        sut = env
+
+        env.kafka().addTopics("late-topic")
+
+        assertTrue(env.kafka().topics().contains("late-topic"))
+        Admin.create(
+            mapOf(
+                BOOTSTRAP_SERVERS_CONFIG to env.kafka().config.bootstrapServers,
+                REQUEST_TIMEOUT_MS_CONFIG to "8000",
+                DEFAULT_API_TIMEOUT_MS_CONFIG to "12000"
+            )
+        ).use { assertTrue(it.listTopics().names().get().contains("late-topic")) }
+    }
+
     @Test
     fun fixedEnvironmentIsNotSupported() {
         val port = Environment.findAvailableTcpPort()