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+---
+name: writing-tests
+description: >
+  Testing patterns for Vert.x SQL Client: test frameworks, async testing,
+  test locations, and how to run tests.
+---
+
+# Writing Tests
+
+Vert.x SQL Client uses JUnit 4 with Vert.x-specific test utilities. Tests and documentation are mandatory for contributions.
+
+## Test Framework
+
+- **JUnit 4** (version 4.13.1) - Standard test framework
+- **VertxUnitRunner** - JUnit 4 runner for async tests
+- **TestContext** - Async test utility for handling asynchronous operations
+- **Docker** - Required for integration tests (database containers)
+
+## Test Annotations and Extensions
+
+### Standard Test Patterns
+
+#### Pattern 1: Using Async with Simple Callback
+
+```java
+@RunWith(VertxUnitRunner.class)
+public class MyTest {
+
+  @Test
+  public void testWithAsync(TestContext ctx) {
+    Async async = ctx.async();
+    vertx.runOnContext(v -> async.complete());
+  }
+}
+```
+
+#### Pattern 2: Using asyncAssertSuccess Directly
+
+When using `asyncAssertSuccess`, do not call `async.complete()` as it creates an async internally:
+
+```java
+@RunWith(VertxUnitRunner.class)
+public class MyTest {
+
+  @Test
+  public void testAsyncAssertSuccess(TestContext ctx) {
+    client.query("SELECT 1")
+      .execute()
+      .onComplete(ctx.asyncAssertSuccess(result -> {
+        ctx.assertEquals(1, result.size());
+      }));
+  }
+}
+```
+
+#### Pattern 3: Using asyncAssertSuccess from runOnContext
+
+When calling `asyncAssertSuccess` from `runOnContext`, you need an explicit async:
+
+```java
+@RunWith(VertxUnitRunner.class)
+public class MyTest {
+
+  @Test
+  public void testAsyncAssertSuccessFromRunOnContext(TestContext ctx) {
+    Async async = ctx.async();
+    vertx.runOnContext(v -> {
+      client.query("SELECT 1")
+        .execute()
+        .onComplete(ctx.asyncAssertSuccess(result -> {
+          ctx.assertEquals(1, result.size());
+          async.complete();
+        }));
+    });
+  }
+}
+```
+
+## Test Location
+
+- **Unit tests**: Same module as code under test, in `src/test/java/`
+- **Integration tests**: May be in separate test modules or `src/test/java/`
+- **Database-specific tests**: In respective client module
+  - PostgreSQL: `vertx-pg-client/src/test/`
+  - MySQL: `vertx-mysql-client/src/test/`
+  - MSSQL: `vertx-mssql-client/src/test/`
+  - DB2: `vertx-db2-client/src/test/`
+  - Oracle: `vertx-oracle-client/src/test/`
+
+## Test Data Setup
+
+### Using SQL Scripts
+
+Place initialization scripts in `src/test/resources/`:
+
+```sql
+-- init.sql
+CREATE TABLE users (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(100) NOT NULL
+);
+
+INSERT INTO users (name) VALUES ('Alice'), ('Bob');
+```
+
+### Programmatic Setup
+
+```java
+@Before
+public void setUp(TestContext ctx) {
+  Async async = ctx.async();
+  client.query("CREATE TABLE IF NOT EXISTS users (id SERIAL PRIMARY KEY, name VARCHAR(100))")
+    .execute()
+    .compose(v -> client.query("INSERT INTO users (name) VALUES ('Alice'), ('Bob')").execute())
+    .onComplete(ctx.asyncAssertSuccess(v -> async.complete()));
+}
+
+@After
+public void tearDown(TestContext ctx) {
+  Async async = ctx.async();
+  client.query("DROP TABLE IF EXISTS users")
+    .execute()
+    .onComplete(ctx.asyncAssertSuccess(v -> async.complete()));
+}
+```
+
+Prefer temporary tables when testing databases that support it (automatically dropped when the connection is closed).
+
+## Test Requirements
+
+- **All new features must include tests**
+- **Integration tests must clean up resources** (connections, containers)
+
+## Assertions
+
+### TestContext Assertions (JUnit 4 style)
+
+```java
+ctx.assertEquals(expected, actual);
+ctx.assertTrue(condition);
+ctx.assertFalse(condition);
+ctx.assertNull(value);
+ctx.assertNotNull(value);
+```
+
+## Common Pitfalls
+
+1. **Forgetting to complete async tests** - Always call `async.complete()`
diff --git a/AGENTS.md b/AGENTS.md
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+# Agent Guidelines - vertx-sql-client
+
+Instructions for AI coding agents working in this repository.
+Checkout relevant `.agents/skills/` to accomplish specific tasks.
+
+## Build & Verify Commands
+
+```bash
+mvn test-compile         # compile code and tests
+mvn test                 # run all tests (requires Docker for database interactions)
+mvn spotless:check       # verify formatting
+mvn spotless:apply       # auto-fix formatting
+```
+
+## Project Structure
+
+This is a multi-module Maven project with the following key modules:
+
+- **vertx-sql-client**: Core SQL client API and base implementations
+- **vertx-sql-client-codec**: Shared codec utilities for data type encoding/decoding
+- **vertx-sql-client-templates**: SQL template support for type-safe queries
+- **vertx-pg-client**: PostgreSQL-specific client implementation
+- **vertx-mysql-client**: MySQL/MariaDB-specific client implementation
+- **vertx-mssql-client**: Microsoft SQL Server client implementation
+- **vertx-db2-client**: IBM DB2 client implementation
+- **vertx-oracle-client**: Oracle Database client implementation
+
+### Module Layout Pattern
+
+Each database-specific client follows this structure:
+- `src/main/java/`: Public API interfaces and implementation classes
+  - Top package (e.g., `io.vertx.pgclient`): Public API interfaces
+  - `impl/` subpackage: Implementation classes (not exported)
+- `src/main/asciidoc/`: Module-specific documentation
+- `src/test/java/`: Unit and integration tests
+- `module-info.java`: Defines module exports and dependencies
+
+## General Coding Rules
+
+These rules apply when **writing or modifying code**. Code review is the checkpoint where compliance is verified.
+
+### Logging
+
+In production code, use the Vert.x internal logger, never SLF4J, Log4j, or `java.util.logging` directly.
+
+```java
+import io.vertx.core.internal.logging.Logger;
+import io.vertx.core.internal.logging.LoggerFactory;
+
+private static final Logger logger = LoggerFactory.getLogger(MyClass.class);
+```
+
+Vert.x internal logging API doesn't support parameters placeholders.
+Check the active level before debug or trace logging.
+
+```java
+if (logger.isDebugEnabled()) {
+  logger.debug("Prepared parameters: " + paramDesc);
+}
+```
+
+### Async Patterns
+
+Use Vert.x `Future<T>` and `Promise<T>` throughout. Do not use raw callbacks or `CompletableFuture` in production code.
+
+### API Design
+
+- Public contracts are interfaces in the top package (`io.vertx.sqlclient`, `io.vertx.pgclient`, …)
+- Implementations go in `impl/` subpackages
+- Annotate public API interfaces and methods with `@VertxGen` for code-generation support
+- Expose construction via static factory methods, not constructors
+
+### Module Boundaries
+
+`module-info.java` governs exports.
+Internal packages are exported only to their corresponding test modules, do not widen exports without discussion.
+Test module descriptors (`src/test/java/module-info.java`) can be modified freely, e.g. to add a `requires` for a new dependency used in tests.
+
+### Copyright Header
+
+New Java files must include the dual-license header matching existing files:
+
+```java
+/*
+ * Copyright (c) 2011-2026 Contributors to the Eclipse Foundation
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
+ * which is available at https://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
+ */
+```
+
+The range is always `2011-[current year]`.
+
+## Testing Guidelines
+
+For comprehensive testing patterns and examples, see `.agents/skills/writing-tests/SKILL.md`.
+
+### Test Framework
+
+- Use **JUnit 4** (version 4.13.1) for all tests
+- Async tests use **VertxUnitRunner** (JUnit 4 runner) and **TestContext**
+- Integration tests require **Docker** for database containers
+
+### Test Patterns
+
+```java
+@RunWith(VertxUnitRunner.class)
+public class MyTest {
+
+  @Test
+  public void testAsyncOperation(TestContext ctx) {
+    Async async = ctx.async();
+    client.query("SELECT 1")
+      .execute()
+      .onComplete(ctx.asyncAssertSuccess(result -> {
+        ctx.assertEquals(1, result.size());
+        async.complete();
+      }));
+  }
+}
+```
+
+### Test Location
+
+- **Unit tests**: Same module as code under test, in `src/test/java/`
+- **Integration tests**: May be in separate test modules or `src/test/java/`
+- **Database-specific tests**: In respective client module (e.g., `vertx-pg-client/src/test/`)
+
+### Running Tests
+
+```bash
+mvn test                           # Run all tests (requires Docker)
+mvn test -Dtest=MyTest             # Run specific test class
+mvn test -Dtest=MyTest#testMethod  # Run specific test method
+
+# When your change spans modules (e.g. modifying vertx-sql-client-codec and
+# testing in vertx-pg-client), use -am to rebuild dependencies:
+mvn test -pl vertx-pg-client -am -Dtest=MyTest
+```
+
+### Test Requirements
+
+- All new features must include tests
+- Database tests must clean up resources (connections, containers)
+
+## Development Workflow
+
+### Incremental Development
+
+When making changes:
+1. Compile frequently: `mvn compile -pl <module>`
+2. Run affected tests: `mvn test -pl <module>`
+3. Verify formatting: `mvn spotless:check`
+4. Run full build before PR: `mvn clean install`
+
+### Build Optimization
+
+```bash
+# Skip tests during development
+mvn compile -DskipTests
+
+# Build specific module and dependencies
+mvn install -pl vertx-pg-client -am
+```
+
+## Specialized Skills
+
+When performing specific tasks, read the relevant skill file for detailed guidance:
+
+- **Writing tests** - Read `.agents/skills/writing-tests/SKILL.md` when creating or modifying tests
+
+## Contribution Process
+
+- All commits must be signed off: `git commit -s` (DCO)
+- Commit messages should end with: `Assisted-by: [Provider] [Model-Family] ([Version/ID])` (replace placeholders)
+- Contributors must have signed the [Eclipse Contributor Agreement (ECA)](https://www.eclipse.org/legal/ECA.php)
+
+See [CONTRIBUTING.md](CONTRIBUTING.md) for the full contribution workflow.
+
+## Code Review Guidelines
+
+### Verify
+
+- General coding rules above are followed
+- Test coverage is present; async tests use `VertxUnitRunner` and `TestContext`
+- No breaking changes to public interfaces without prior discussion
+
+### Do Not Comment On
+
+- Patterns already used consistently throughout the codebase
diff --git a/CLAUDE.md b/CLAUDE.md
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+@AGENTS.md
+
+# Agent Guidelines - vertx-sql-client
+
+## Specialized Skills
+
+When performing specific tasks, read the relevant skill file for detailed guidance:
+
+- **Writing tests** - Read `.agents/skills/writing-tests/SKILL.md` when creating or modifying tests