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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.2.0] - 2025-11-10
+
+### BREAKING CHANGES
+
+#### Removed Deprecated Event Variants
+
+The `MessagePartAdded` event variant has been removed from the `Event` enum. This variant was part of the old streaming system and has been replaced by the new ACP-style `SessionUpdate` event.
+
+**Migration Guide:**
+
+If you were using `MessagePartAdded`, you should migrate to using `SessionUpdate` instead:
+
+**Old code:**
+```rust
+match event {
+    Event::MessagePartAdded { session_id, message_id, part } => {
+        // Handle message part
+    }
+    // ...
+}
+```
+
+**New code:**
+```rust
+match event {
+    Event::SessionUpdate { session_id, update } => {
+        match update {
+            SessionUpdate::UserMessageChunk { message_id, content, .. } => {
+                // Handle user message content
+            }
+            SessionUpdate::AgentMessageChunk { message_id, content, .. } => {
+                // Handle agent message content
+            }
+            SessionUpdate::AgentThoughtChunk { message_id, content, .. } => {
+                // Handle agent thinking/reasoning
+            }
+            SessionUpdate::ToolCall { message_id, tool_call, .. } => {
+                // Handle tool call initiated
+            }
+            SessionUpdate::ToolCallUpdate { message_id, tool_call_id, tool_call, .. } => {
+                // Handle tool call updates
+            }
+        }
+    }
+    // ...
+}
+```
+
+**Key Differences:**
+
+1. `SessionUpdate` uses typed `ContentBlock` instead of generic `MessagePart`
+2. Updates are categorized by type (user/agent/thought/tool)
+3. Better separation of concerns for streaming content
+4. Aligns with Agent-Client Protocol (ACP) standards
+
+**What This Means:**
+
+- The protocol now uses a unified streaming model via `SessionUpdate`
+- Better alignment with ACP specification
+- Clearer separation between message lifecycle events and streaming updates
+- More structured content representation with `ContentBlock`
+
+### Added
+
+- `SessionUpdate` event variant with ACP-style streaming updates
+- `SessionUpdate` enum with variants:
+  - `UserMessageChunk`: User message content streaming
+  - `AgentMessageChunk`: Agent message content streaming
+  - `AgentThoughtChunk`: Agent reasoning/thinking streaming
+  - `ToolCall`: Tool call initiated
+  - `ToolCallUpdate`: Tool call status/content updates
+- `ContentBlock` enum for structured content representation
+- `ToolCall` type with status tracking and metadata
+
+### Changed
+
+- Streaming events now use `SessionUpdate` instead of `MessagePartAdded`
+- Version bumped from 0.1.0 to 0.2.0 (breaking change)
+
+## [0.1.0] - 2025-11-09
+
+### Added
+
+- Initial protocol definition
+- `Event` enum with session, message, connector, and system events
+- `Session` and `SessionMetadata` types
+- `Message`, `MessageMetadata`, `MessageRole`, `MessageStatus` types
+- `MessagePart` enum for message content
+- OpenCode adapter for translating OpenCode events to Dirigent protocol
+- REST adapter for converting REST API responses
+- Comprehensive test suite