diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 9cdb8016..e8a6392c 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -2,6 +2,20 @@
 
 ## [Unreleased]
 
+### Added
+
+- **Hooks system**: TypeScript modules that extend agent behavior by subscribing to lifecycle events. Hooks can intercept tool calls, prompt for confirmation, modify results, and inject messages from external sources. Auto-discovered from `~/.pi/agent/hooks/*.ts` and `.pi/hooks/*.ts`. ([#145](https://github.com/badlogic/pi-mono/issues/145), supersedes [#158](https://github.com/badlogic/pi-mono/pull/158))
+
+- **`pi.send()` API**: Hooks can inject messages into the agent session from external sources (file watchers, webhooks, CI systems). If streaming, messages are queued; otherwise a new agent loop starts immediately.
+
+- **`--hook <path>` CLI flag**: Load hook files directly for testing without modifying settings.
+
+- **Hook events**: `session_start`, `session_switch`, `agent_start`, `agent_end`, `turn_start`, `turn_end`, `tool_call` (can block), `tool_result` (can modify), `branch`.
+
+- **Hook UI primitives**: `ctx.ui.select()`, `ctx.ui.confirm()`, `ctx.ui.input()`, `ctx.ui.notify()` for interactive prompts from hooks.
+
+- **Hooks documentation**: Full API reference at `docs/hooks.md`, shipped with npm package.
+
 ## [0.17.0] - 2025-12-09
 
 ### Changed